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Diffstat (limited to 'arch/sparc/mm/srmmu.c')
| -rw-r--r-- | arch/sparc/mm/srmmu.c | 2274 |
1 files changed, 2274 insertions, 0 deletions
diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c new file mode 100644 index 0000000..c89a803 --- /dev/null +++ b/arch/sparc/mm/srmmu.c @@ -0,0 +1,2274 @@ +/* + * srmmu.c: SRMMU specific routines for memory management. + * + * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1995,2002 Pete Zaitcev (zaitcev@yahoo.com) + * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) + * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + * Copyright (C) 1999,2000 Anton Blanchard (anton@samba.org) + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/pagemap.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/bootmem.h> +#include <linux/fs.h> +#include <linux/seq_file.h> + +#include <asm/bitext.h> +#include <asm/page.h> +#include <asm/pgalloc.h> +#include <asm/pgtable.h> +#include <asm/io.h> +#include <asm/kdebug.h> +#include <asm/vaddrs.h> +#include <asm/traps.h> +#include <asm/smp.h> +#include <asm/mbus.h> +#include <asm/cache.h> +#include <asm/oplib.h> +#include <asm/sbus.h> +#include <asm/asi.h> +#include <asm/msi.h> +#include <asm/a.out.h> +#include <asm/mmu_context.h> +#include <asm/io-unit.h> +#include <asm/cacheflush.h> +#include <asm/tlbflush.h> + +/* Now the cpu specific definitions. */ +#include <asm/viking.h> +#include <asm/mxcc.h> +#include <asm/ross.h> +#include <asm/tsunami.h> +#include <asm/swift.h> +#include <asm/turbosparc.h> + +#include <asm/btfixup.h> + +enum mbus_module srmmu_modtype; +unsigned int hwbug_bitmask; +int vac_cache_size; +int vac_line_size; + +extern struct resource sparc_iomap; + +extern unsigned long last_valid_pfn; + +extern unsigned long page_kernel; + +pgd_t *srmmu_swapper_pg_dir; + +#ifdef CONFIG_SMP +#define FLUSH_BEGIN(mm) +#define FLUSH_END +#else +#define FLUSH_BEGIN(mm) if((mm)->context != NO_CONTEXT) { +#define FLUSH_END } +#endif + +BTFIXUPDEF_CALL(void, flush_page_for_dma, unsigned long) +#define flush_page_for_dma(page) BTFIXUP_CALL(flush_page_for_dma)(page) + +int flush_page_for_dma_global = 1; + +#ifdef CONFIG_SMP +BTFIXUPDEF_CALL(void, local_flush_page_for_dma, unsigned long) +#define local_flush_page_for_dma(page) BTFIXUP_CALL(local_flush_page_for_dma)(page) +#endif + +char *srmmu_name; + +ctxd_t *srmmu_ctx_table_phys; +ctxd_t *srmmu_context_table; + +int viking_mxcc_present; +static DEFINE_SPINLOCK(srmmu_context_spinlock); + +int is_hypersparc; + +/* + * In general all page table modifications should use the V8 atomic + * swap instruction. This insures the mmu and the cpu are in sync + * with respect to ref/mod bits in the page tables. + */ +static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value) +{ + __asm__ __volatile__("swap [%2], %0" : "=&r" (value) : "0" (value), "r" (addr)); + return value; +} + +static inline void srmmu_set_pte(pte_t *ptep, pte_t pteval) +{ + srmmu_swap((unsigned long *)ptep, pte_val(pteval)); +} + +/* The very generic SRMMU page table operations. */ +static inline int srmmu_device_memory(unsigned long x) +{ + return ((x & 0xF0000000) != 0); +} + +int srmmu_cache_pagetables; + +/* these will be initialized in srmmu_nocache_calcsize() */ +unsigned long srmmu_nocache_size; +unsigned long srmmu_nocache_end; + +/* 1 bit <=> 256 bytes of nocache <=> 64 PTEs */ +#define SRMMU_NOCACHE_BITMAP_SHIFT (PAGE_SHIFT - 4) + +/* The context table is a nocache user with the biggest alignment needs. */ +#define SRMMU_NOCACHE_ALIGN_MAX (sizeof(ctxd_t)*SRMMU_MAX_CONTEXTS) + +void *srmmu_nocache_pool; +void *srmmu_nocache_bitmap; +static struct bit_map srmmu_nocache_map; + +static unsigned long srmmu_pte_pfn(pte_t pte) +{ + if (srmmu_device_memory(pte_val(pte))) { + /* Just return something that will cause + * pfn_valid() to return false. This makes + * copy_one_pte() to just directly copy to + * PTE over. + */ + return ~0UL; + } + return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4); +} + +static struct page *srmmu_pmd_page(pmd_t pmd) +{ + + if (srmmu_device_memory(pmd_val(pmd))) + BUG(); + return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4)); +} + +static inline unsigned long srmmu_pgd_page(pgd_t pgd) +{ return srmmu_device_memory(pgd_val(pgd))?~0:(unsigned long)__nocache_va((pgd_val(pgd) & SRMMU_PTD_PMASK) << 4); } + + +static inline int srmmu_pte_none(pte_t pte) +{ return !(pte_val(pte) & 0xFFFFFFF); } + +static inline int srmmu_pte_present(pte_t pte) +{ return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE); } + +static inline int srmmu_pte_read(pte_t pte) +{ return !(pte_val(pte) & SRMMU_NOREAD); } + +static inline void srmmu_pte_clear(pte_t *ptep) +{ srmmu_set_pte(ptep, __pte(0)); } + +static inline int srmmu_pmd_none(pmd_t pmd) +{ return !(pmd_val(pmd) & 0xFFFFFFF); } + +static inline int srmmu_pmd_bad(pmd_t pmd) +{ return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD; } + +static inline int srmmu_pmd_present(pmd_t pmd) +{ return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD); } + +static inline void srmmu_pmd_clear(pmd_t *pmdp) { + int i; + for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) + srmmu_set_pte((pte_t *)&pmdp->pmdv[i], __pte(0)); +} + +static inline int srmmu_pgd_none(pgd_t pgd) +{ return !(pgd_val(pgd) & 0xFFFFFFF); } + +static inline int srmmu_pgd_bad(pgd_t pgd) +{ return (pgd_val(pgd) & SRMMU_ET_MASK) != SRMMU_ET_PTD; } + +static inline int srmmu_pgd_present(pgd_t pgd) +{ return ((pgd_val(pgd) & SRMMU_ET_MASK) == SRMMU_ET_PTD); } + +static inline void srmmu_pgd_clear(pgd_t * pgdp) +{ srmmu_set_pte((pte_t *)pgdp, __pte(0)); } + +static inline pte_t srmmu_pte_wrprotect(pte_t pte) +{ return __pte(pte_val(pte) & ~SRMMU_WRITE);} + +static inline pte_t srmmu_pte_mkclean(pte_t pte) +{ return __pte(pte_val(pte) & ~SRMMU_DIRTY);} + +static inline pte_t srmmu_pte_mkold(pte_t pte) +{ return __pte(pte_val(pte) & ~SRMMU_REF);} + +static inline pte_t srmmu_pte_mkwrite(pte_t pte) +{ return __pte(pte_val(pte) | SRMMU_WRITE);} + +static inline pte_t srmmu_pte_mkdirty(pte_t pte) +{ return __pte(pte_val(pte) | SRMMU_DIRTY);} + +static inline pte_t srmmu_pte_mkyoung(pte_t pte) +{ return __pte(pte_val(pte) | SRMMU_REF);} + +/* + * Conversion functions: convert a page and protection to a page entry, + * and a page entry and page directory to the page they refer to. + */ +static pte_t srmmu_mk_pte(struct page *page, pgprot_t pgprot) +{ return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot)); } + +static pte_t srmmu_mk_pte_phys(unsigned long page, pgprot_t pgprot) +{ return __pte(((page) >> 4) | pgprot_val(pgprot)); } + +static pte_t srmmu_mk_pte_io(unsigned long page, pgprot_t pgprot, int space) +{ return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot)); } + +/* XXX should we hyper_flush_whole_icache here - Anton */ +static inline void srmmu_ctxd_set(ctxd_t *ctxp, pgd_t *pgdp) +{ srmmu_set_pte((pte_t *)ctxp, (SRMMU_ET_PTD | (__nocache_pa((unsigned long) pgdp) >> 4))); } + +static inline void srmmu_pgd_set(pgd_t * pgdp, pmd_t * pmdp) +{ srmmu_set_pte((pte_t *)pgdp, (SRMMU_ET_PTD | (__nocache_pa((unsigned long) pmdp) >> 4))); } + +static void srmmu_pmd_set(pmd_t *pmdp, pte_t *ptep) +{ + unsigned long ptp; /* Physical address, shifted right by 4 */ + int i; + + ptp = __nocache_pa((unsigned long) ptep) >> 4; + for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) { + srmmu_set_pte((pte_t *)&pmdp->pmdv[i], SRMMU_ET_PTD | ptp); + ptp += (SRMMU_REAL_PTRS_PER_PTE*sizeof(pte_t) >> 4); + } +} + +static void srmmu_pmd_populate(pmd_t *pmdp, struct page *ptep) +{ + unsigned long ptp; /* Physical address, shifted right by 4 */ + int i; + + ptp = page_to_pfn(ptep) << (PAGE_SHIFT-4); /* watch for overflow */ + for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) { + srmmu_set_pte((pte_t *)&pmdp->pmdv[i], SRMMU_ET_PTD | ptp); + ptp += (SRMMU_REAL_PTRS_PER_PTE*sizeof(pte_t) >> 4); + } +} + +static inline pte_t srmmu_pte_modify(pte_t pte, pgprot_t newprot) +{ return __pte((pte_val(pte) & SRMMU_CHG_MASK) | pgprot_val(newprot)); } + +/* to find an entry in a top-level page table... */ +extern inline pgd_t *srmmu_pgd_offset(struct mm_struct * mm, unsigned long address) +{ return mm->pgd + (address >> SRMMU_PGDIR_SHIFT); } + +/* Find an entry in the second-level page table.. */ +static inline pmd_t *srmmu_pmd_offset(pgd_t * dir, unsigned long address) +{ + return (pmd_t *) srmmu_pgd_page(*dir) + + ((address >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); +} + +/* Find an entry in the third-level page table.. */ +static inline pte_t *srmmu_pte_offset(pmd_t * dir, unsigned long address) +{ + void *pte; + + pte = __nocache_va((dir->pmdv[0] & SRMMU_PTD_PMASK) << 4); + return (pte_t *) pte + + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); +} + +static unsigned long srmmu_swp_type(swp_entry_t entry) +{ + return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK; +} + +static unsigned long srmmu_swp_offset(swp_entry_t entry) +{ + return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK; +} + +static swp_entry_t srmmu_swp_entry(unsigned long type, unsigned long offset) +{ + return (swp_entry_t) { + (type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT + | (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT }; +} + +/* + * size: bytes to allocate in the nocache area. + * align: bytes, number to align at. + * Returns the virtual address of the allocated area. + */ +static unsigned long __srmmu_get_nocache(int size, int align) +{ + int offset; + + if (size < SRMMU_NOCACHE_BITMAP_SHIFT) { + printk("Size 0x%x too small for nocache request\n", size); + size = SRMMU_NOCACHE_BITMAP_SHIFT; + } + if (size & (SRMMU_NOCACHE_BITMAP_SHIFT-1)) { + printk("Size 0x%x unaligned int nocache request\n", size); + size += SRMMU_NOCACHE_BITMAP_SHIFT-1; + } + BUG_ON(align > SRMMU_NOCACHE_ALIGN_MAX); + + offset = bit_map_string_get(&srmmu_nocache_map, + size >> SRMMU_NOCACHE_BITMAP_SHIFT, + align >> SRMMU_NOCACHE_BITMAP_SHIFT); + if (offset == -1) { + printk("srmmu: out of nocache %d: %d/%d\n", + size, (int) srmmu_nocache_size, + srmmu_nocache_map.used << SRMMU_NOCACHE_BITMAP_SHIFT); + return 0; + } + + return (SRMMU_NOCACHE_VADDR + (offset << SRMMU_NOCACHE_BITMAP_SHIFT)); +} + +unsigned inline long srmmu_get_nocache(int size, int align) +{ + unsigned long tmp; + + tmp = __srmmu_get_nocache(size, align); + + if (tmp) + memset((void *)tmp, 0, size); + + return tmp; +} + +void srmmu_free_nocache(unsigned long vaddr, int size) +{ + int offset; + + if (vaddr < SRMMU_NOCACHE_VADDR) { + printk("Vaddr %lx is smaller than nocache base 0x%lx\n", + vaddr, (unsigned long)SRMMU_NOCACHE_VADDR); + BUG(); + } + if (vaddr+size > srmmu_nocache_end) { + printk("Vaddr %lx is bigger than nocache end 0x%lx\n", + vaddr, srmmu_nocache_end); + BUG(); + } + if (size & (size-1)) { + printk("Size 0x%x is not a power of 2\n", size); + BUG(); + } + if (size < SRMMU_NOCACHE_BITMAP_SHIFT) { + printk("Size 0x%x is too small\n", size); + BUG(); + } + if (vaddr & (size-1)) { + printk("Vaddr %lx is not aligned to size 0x%x\n", vaddr, size); + BUG(); + } + + offset = (vaddr - SRMMU_NOCACHE_VADDR) >> SRMMU_NOCACHE_BITMAP_SHIFT; + size = size >> SRMMU_NOCACHE_BITMAP_SHIFT; + + bit_map_clear(&srmmu_nocache_map, offset, size); +} + +void srmmu_early_allocate_ptable_skeleton(unsigned long start, unsigned long end); + +extern unsigned long probe_memory(void); /* in fault.c */ + +/* + * Reserve nocache dynamically proportionally to the amount of + * system RAM. -- Tomas Szepe <szepe@pinerecords.com>, June 2002 + */ +void srmmu_nocache_calcsize(void) +{ + unsigned long sysmemavail = probe_memory() / 1024; + int srmmu_nocache_npages; + + srmmu_nocache_npages = + sysmemavail / SRMMU_NOCACHE_ALCRATIO / 1024 * 256; + + /* P3 XXX The 4x overuse: corroborated by /proc/meminfo. */ + // if (srmmu_nocache_npages < 256) srmmu_nocache_npages = 256; + if (srmmu_nocache_npages < SRMMU_MIN_NOCACHE_PAGES) + srmmu_nocache_npages = SRMMU_MIN_NOCACHE_PAGES; + + /* anything above 1280 blows up */ + if (srmmu_nocache_npages > SRMMU_MAX_NOCACHE_PAGES) + srmmu_nocache_npages = SRMMU_MAX_NOCACHE_PAGES; + + srmmu_nocache_size = srmmu_nocache_npages * PAGE_SIZE; + srmmu_nocache_end = SRMMU_NOCACHE_VADDR + srmmu_nocache_size; +} + +void srmmu_nocache_init(void) +{ + unsigned int bitmap_bits; + pgd_t *pgd; + pmd_t *pmd; + pte_t *pte; + unsigned long paddr, vaddr; + unsigned long pteval; + + bitmap_bits = srmmu_nocache_size >> SRMMU_NOCACHE_BITMAP_SHIFT; + + srmmu_nocache_pool = __alloc_bootmem(srmmu_nocache_size, + SRMMU_NOCACHE_ALIGN_MAX, 0UL); + memset(srmmu_nocache_pool, 0, srmmu_nocache_size); + + srmmu_nocache_bitmap = __alloc_bootmem(bitmap_bits >> 3, SMP_CACHE_BYTES, 0UL); + bit_map_init(&srmmu_nocache_map, srmmu_nocache_bitmap, bitmap_bits); + + srmmu_swapper_pg_dir = (pgd_t *)__srmmu_get_nocache(SRMMU_PGD_TABLE_SIZE, SRMMU_PGD_TABLE_SIZE); + memset(__nocache_fix(srmmu_swapper_pg_dir), 0, SRMMU_PGD_TABLE_SIZE); + init_mm.pgd = srmmu_swapper_pg_dir; + + srmmu_early_allocate_ptable_skeleton(SRMMU_NOCACHE_VADDR, srmmu_nocache_end); + + paddr = __pa((unsigned long)srmmu_nocache_pool); + vaddr = SRMMU_NOCACHE_VADDR; + + while (vaddr < srmmu_nocache_end) { + pgd = pgd_offset_k(vaddr); + pmd = srmmu_pmd_offset(__nocache_fix(pgd), vaddr); + pte = srmmu_pte_offset(__nocache_fix(pmd), vaddr); + + pteval = ((paddr >> 4) | SRMMU_ET_PTE | SRMMU_PRIV); + + if (srmmu_cache_pagetables) + pteval |= SRMMU_CACHE; + + srmmu_set_pte(__nocache_fix(pte), __pte(pteval)); + + vaddr += PAGE_SIZE; + paddr += PAGE_SIZE; + } + + flush_cache_all(); + flush_tlb_all(); +} + +static inline pgd_t *srmmu_get_pgd_fast(void) +{ + pgd_t *pgd = NULL; + + pgd = (pgd_t *)__srmmu_get_nocache(SRMMU_PGD_TABLE_SIZE, SRMMU_PGD_TABLE_SIZE); + if (pgd) { + pgd_t *init = pgd_offset_k(0); + memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); + memcpy(pgd + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, + (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); + } + + return pgd; +} + +static void srmmu_free_pgd_fast(pgd_t *pgd) +{ + srmmu_free_nocache((unsigned long)pgd, SRMMU_PGD_TABLE_SIZE); +} + +static pmd_t *srmmu_pmd_alloc_one(struct mm_struct *mm, unsigned long address) +{ + return (pmd_t *)srmmu_get_nocache(SRMMU_PMD_TABLE_SIZE, SRMMU_PMD_TABLE_SIZE); +} + +static void srmmu_pmd_free(pmd_t * pmd) +{ + srmmu_free_nocache((unsigned long)pmd, SRMMU_PMD_TABLE_SIZE); +} + +/* + * Hardware needs alignment to 256 only, but we align to whole page size + * to reduce fragmentation problems due to the buddy principle. + * XXX Provide actual fragmentation statistics in /proc. + * + * Alignments up to the page size are the same for physical and virtual + * addresses of the nocache area. + */ +static pte_t * +srmmu_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) +{ + return (pte_t *)srmmu_get_nocache(PTE_SIZE, PTE_SIZE); +} + +static struct page * +srmmu_pte_alloc_one(struct mm_struct *mm, unsigned long address) +{ + unsigned long pte; + + if ((pte = (unsigned long)srmmu_pte_alloc_one_kernel(mm, address)) == 0) + return NULL; + return pfn_to_page( __nocache_pa(pte) >> PAGE_SHIFT ); +} + +static void srmmu_free_pte_fast(pte_t *pte) +{ + srmmu_free_nocache((unsigned long)pte, PTE_SIZE); +} + +static void srmmu_pte_free(struct page *pte) +{ + unsigned long p; + + p = (unsigned long)page_address(pte); /* Cached address (for test) */ + if (p == 0) + BUG(); + p = page_to_pfn(pte) << PAGE_SHIFT; /* Physical address */ + p = (unsigned long) __nocache_va(p); /* Nocached virtual */ + srmmu_free_nocache(p, PTE_SIZE); +} + +/* + */ +static inline void alloc_context(struct mm_struct *old_mm, struct mm_struct *mm) +{ + struct ctx_list *ctxp; + + ctxp = ctx_free.next; + if(ctxp != &ctx_free) { + remove_from_ctx_list(ctxp); + add_to_used_ctxlist(ctxp); + mm->context = ctxp->ctx_number; + ctxp->ctx_mm = mm; + return; + } + ctxp = ctx_used.next; + if(ctxp->ctx_mm == old_mm) + ctxp = ctxp->next; + if(ctxp == &ctx_used) + panic("out of mmu contexts"); + flush_cache_mm(ctxp->ctx_mm); + flush_tlb_mm(ctxp->ctx_mm); + remove_from_ctx_list(ctxp); + add_to_used_ctxlist(ctxp); + ctxp->ctx_mm->context = NO_CONTEXT; + ctxp->ctx_mm = mm; + mm->context = ctxp->ctx_number; +} + +static inline void free_context(int context) +{ + struct ctx_list *ctx_old; + + ctx_old = ctx_list_pool + context; + remove_from_ctx_list(ctx_old); + add_to_free_ctxlist(ctx_old); +} + + +static void srmmu_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, + struct task_struct *tsk, int cpu) +{ + if(mm->context == NO_CONTEXT) { + spin_lock(&srmmu_context_spinlock); + alloc_context(old_mm, mm); + spin_unlock(&srmmu_context_spinlock); + srmmu_ctxd_set(&srmmu_context_table[mm->context], mm->pgd); + } + + if (is_hypersparc) + hyper_flush_whole_icache(); + + srmmu_set_context(mm->context); +} + +/* Low level IO area allocation on the SRMMU. */ +static inline void srmmu_mapioaddr(unsigned long physaddr, + unsigned long virt_addr, int bus_type) +{ + pgd_t *pgdp; + pmd_t *pmdp; + pte_t *ptep; + unsigned long tmp; + + physaddr &= PAGE_MASK; + pgdp = pgd_offset_k(virt_addr); + pmdp = srmmu_pmd_offset(pgdp, virt_addr); + ptep = srmmu_pte_offset(pmdp, virt_addr); + tmp = (physaddr >> 4) | SRMMU_ET_PTE; + + /* + * I need to test whether this is consistent over all + * sun4m's. The bus_type represents the upper 4 bits of + * 36-bit physical address on the I/O space lines... + */ + tmp |= (bus_type << 28); + tmp |= SRMMU_PRIV; + __flush_page_to_ram(virt_addr); + srmmu_set_pte(ptep, __pte(tmp)); +} + +static void srmmu_mapiorange(unsigned int bus, unsigned long xpa, + unsigned long xva, unsigned int len) +{ + while (len != 0) { + len -= PAGE_SIZE; + srmmu_mapioaddr(xpa, xva, bus); + xva += PAGE_SIZE; + xpa += PAGE_SIZE; + } + flush_tlb_all(); +} + +static inline void srmmu_unmapioaddr(unsigned long virt_addr) +{ + pgd_t *pgdp; + pmd_t *pmdp; + pte_t *ptep; + + pgdp = pgd_offset_k(virt_addr); + pmdp = srmmu_pmd_offset(pgdp, virt_addr); + ptep = srmmu_pte_offset(pmdp, virt_addr); + + /* No need to flush uncacheable page. */ + srmmu_pte_clear(ptep); +} + +static void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len) +{ + while (len != 0) { + len -= PAGE_SIZE; + srmmu_unmapioaddr(virt_addr); + virt_addr += PAGE_SIZE; + } + flush_tlb_all(); +} + +/* + * On the SRMMU we do not have the problems with limited tlb entries + * for mapping kernel pages, so we just take things from the free page + * pool. As a side effect we are putting a little too much pressure + * on the gfp() subsystem. This setup also makes the logic of the + * iommu mapping code a lot easier as we can transparently handle + * mappings on the kernel stack without any special code as we did + * need on the sun4c. + */ +struct thread_info *srmmu_alloc_thread_info(void) +{ + struct thread_info *ret; + + ret = (struct thread_info *)__get_free_pages(GFP_KERNEL, + THREAD_INFO_ORDER); +#ifdef CONFIG_DEBUG_STACK_USAGE + if (ret) + memset(ret, 0, PAGE_SIZE << THREAD_INFO_ORDER); +#endif /* DEBUG_STACK_USAGE */ + + return ret; +} + +static void srmmu_free_thread_info(struct thread_info *ti) +{ + free_pages((unsigned long)ti, THREAD_INFO_ORDER); +} + +/* tsunami.S */ +extern void tsunami_flush_cache_all(void); +extern void tsunami_flush_cache_mm(struct mm_struct *mm); +extern void tsunami_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); +extern void tsunami_flush_cache_page(struct vm_area_struct *vma, unsigned long page); +extern void tsunami_flush_page_to_ram(unsigned long page); +extern void tsunami_flush_page_for_dma(unsigned long page); +extern void tsunami_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr); +extern void tsunami_flush_tlb_all(void); +extern void tsunami_flush_tlb_mm(struct mm_struct *mm); +extern void tsunami_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); +extern void tsunami_flush_tlb_page(struct vm_area_struct *vma, unsigned long page); +extern void tsunami_setup_blockops(void); + +/* + * Workaround, until we find what's going on with Swift. When low on memory, + * it sometimes loops in fault/handle_mm_fault incl. flush_tlb_page to find + * out it is already in page tables/ fault again on the same instruction. + * I really don't understand it, have checked it and contexts + * are right, flush_tlb_all is done as well, and it faults again... + * Strange. -jj + * + * The following code is a deadwood that may be necessary when + * we start to make precise page flushes again. --zaitcev + */ +static void swift_update_mmu_cache(struct vm_area_struct * vma, unsigned long address, pte_t pte) +{ +#if 0 + static unsigned long last; + unsigned int val; + /* unsigned int n; */ + + if (address == last) { + val = srmmu_hwprobe(address); + if (val != 0 && pte_val(pte) != val) { + printk("swift_update_mmu_cache: " + "addr %lx put %08x probed %08x from %p\n", + address, pte_val(pte), val, + __builtin_return_address(0)); + srmmu_flush_whole_tlb(); + } + } + last = address; +#endif +} + +/* swift.S */ +extern void swift_flush_cache_all(void); +extern void swift_flush_cache_mm(struct mm_struct *mm); +extern void swift_flush_cache_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end); +extern void swift_flush_cache_page(struct vm_area_struct *vma, unsigned long page); +extern void swift_flush_page_to_ram(unsigned long page); +extern void swift_flush_page_for_dma(unsigned long page); +extern void swift_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr); +extern void swift_flush_tlb_all(void); +extern void swift_flush_tlb_mm(struct mm_struct *mm); +extern void swift_flush_tlb_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end); +extern void swift_flush_tlb_page(struct vm_area_struct *vma, unsigned long page); + +#if 0 /* P3: deadwood to debug precise flushes on Swift. */ +void swift_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) +{ + int cctx, ctx1; + + page &= PAGE_MASK; + if ((ctx1 = vma->vm_mm->context) != -1) { + cctx = srmmu_get_context(); +/* Is context # ever different from current context? P3 */ + if (cctx != ctx1) { + printk("flush ctx %02x curr %02x\n", ctx1, cctx); + srmmu_set_context(ctx1); + swift_flush_page(page); + __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : + "r" (page), "i" (ASI_M_FLUSH_PROBE)); + srmmu_set_context(cctx); + } else { + /* Rm. prot. bits from virt. c. */ + /* swift_flush_cache_all(); */ + /* swift_flush_cache_page(vma, page); */ + swift_flush_page(page); + + __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : + "r" (page), "i" (ASI_M_FLUSH_PROBE)); + /* same as above: srmmu_flush_tlb_page() */ + } + } +} +#endif + +/* + * The following are all MBUS based SRMMU modules, and therefore could + * be found in a multiprocessor configuration. On the whole, these + * chips seems to be much more touchy about DVMA and page tables + * with respect to cache coherency. + */ + +/* Cypress flushes. */ +static void cypress_flush_cache_all(void) +{ + volatile unsigned long cypress_sucks; + unsigned long faddr, tagval; + + flush_user_windows(); + for(faddr = 0; faddr < 0x10000; faddr += 0x20) { + __asm__ __volatile__("lda [%1 + %2] %3, %0\n\t" : + "=r" (tagval) : + "r" (faddr), "r" (0x40000), + "i" (ASI_M_DATAC_TAG)); + + /* If modified and valid, kick it. */ + if((tagval & 0x60) == 0x60) + cypress_sucks = *(unsigned long *)(0xf0020000 + faddr); + } +} + +static void cypress_flush_cache_mm(struct mm_struct *mm) +{ + register unsigned long a, b, c, d, e, f, g; + unsigned long flags, faddr; + int octx; + + FLUSH_BEGIN(mm) + flush_user_windows(); + local_irq_save(flags); + octx = srmmu_get_context(); + srmmu_set_context(mm->context); + a = 0x20; b = 0x40; c = 0x60; + d = 0x80; e = 0xa0; f = 0xc0; g = 0xe0; + + faddr = (0x10000 - 0x100); + goto inside; + do { + faddr -= 0x100; + inside: + __asm__ __volatile__("sta %%g0, [%0] %1\n\t" + "sta %%g0, [%0 + %2] %1\n\t" + "sta %%g0, [%0 + %3] %1\n\t" + "sta %%g0, [%0 + %4] %1\n\t" + "sta %%g0, [%0 + %5] %1\n\t" + "sta %%g0, [%0 + %6] %1\n\t" + "sta %%g0, [%0 + %7] %1\n\t" + "sta %%g0, [%0 + %8] %1\n\t" : : + "r" (faddr), "i" (ASI_M_FLUSH_CTX), + "r" (a), "r" (b), "r" (c), "r" (d), + "r" (e), "r" (f), "r" (g)); + } while(faddr); + srmmu_set_context(octx); + local_irq_restore(flags); + FLUSH_END +} + +static void cypress_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) +{ + struct mm_struct *mm = vma->vm_mm; + register unsigned long a, b, c, d, e, f, g; + unsigned long flags, faddr; + int octx; + + FLUSH_BEGIN(mm) + flush_user_windows(); + local_irq_save(flags); + octx = srmmu_get_context(); + srmmu_set_context(mm->context); + a = 0x20; b = 0x40; c = 0x60; + d = 0x80; e = 0xa0; f = 0xc0; g = 0xe0; + + start &= SRMMU_REAL_PMD_MASK; + while(start < end) { + faddr = (start + (0x10000 - 0x100)); + goto inside; + do { + faddr -= 0x100; + inside: + __asm__ __volatile__("sta %%g0, [%0] %1\n\t" + "sta %%g0, [%0 + %2] %1\n\t" + "sta %%g0, [%0 + %3] %1\n\t" + "sta %%g0, [%0 + %4] %1\n\t" + "sta %%g0, [%0 + %5] %1\n\t" + "sta %%g0, [%0 + %6] %1\n\t" + "sta %%g0, [%0 + %7] %1\n\t" + "sta %%g0, [%0 + %8] %1\n\t" : : + "r" (faddr), + "i" (ASI_M_FLUSH_SEG), + "r" (a), "r" (b), "r" (c), "r" (d), + "r" (e), "r" (f), "r" (g)); + } while (faddr != start); + start += SRMMU_REAL_PMD_SIZE; + } + srmmu_set_context(octx); + local_irq_restore(flags); + FLUSH_END +} + +static void cypress_flush_cache_page(struct vm_area_struct *vma, unsigned long page) +{ + register unsigned long a, b, c, d, e, f, g; + struct mm_struct *mm = vma->vm_mm; + unsigned long flags, line; + int octx; + + FLUSH_BEGIN(mm) + flush_user_windows(); + local_irq_save(flags); + octx = srmmu_get_context(); + srmmu_set_context(mm->context); + a = 0x20; b = 0x40; c = 0x60; + d = 0x80; e = 0xa0; f = 0xc0; g = 0xe0; + + page &= PAGE_MASK; + line = (page + PAGE_SIZE) - 0x100; + goto inside; + do { + line -= 0x100; + inside: + __asm__ __volatile__("sta %%g0, [%0] %1\n\t" + "sta %%g0, [%0 + %2] %1\n\t" + "sta %%g0, [%0 + %3] %1\n\t" + "sta %%g0, [%0 + %4] %1\n\t" + "sta %%g0, [%0 + %5] %1\n\t" + "sta %%g0, [%0 + %6] %1\n\t" + "sta %%g0, [%0 + %7] %1\n\t" + "sta %%g0, [%0 + %8] %1\n\t" : : + "r" (line), + "i" (ASI_M_FLUSH_PAGE), + "r" (a), "r" (b), "r" (c), "r" (d), + "r" (e), "r" (f), "r" (g)); + } while(line != page); + srmmu_set_context(octx); + local_irq_restore(flags); + FLUSH_END +} + +/* Cypress is copy-back, at least that is how we configure it. */ +static void cypress_flush_page_to_ram(unsigned long page) +{ + register unsigned long a, b, c, d, e, f, g; + unsigned long line; + + a = 0x20; b = 0x40; c = 0x60; d = 0x80; e = 0xa0; f = 0xc0; g = 0xe0; + page &= PAGE_MASK; + line = (page + PAGE_SIZE) - 0x100; + goto inside; + do { + line -= 0x100; + inside: + __asm__ __volatile__("sta %%g0, [%0] %1\n\t" + "sta %%g0, [%0 + %2] %1\n\t" + "sta %%g0, [%0 + %3] %1\n\t" + "sta %%g0, [%0 + %4] %1\n\t" + "sta %%g0, [%0 + %5] %1\n\t" + "sta %%g0, [%0 + %6] %1\n\t" + "sta %%g0, [%0 + %7] %1\n\t" + "sta %%g0, [%0 + %8] %1\n\t" : : + "r" (line), + "i" (ASI_M_FLUSH_PAGE), + "r" (a), "r" (b), "r" (c), "r" (d), + "r" (e), "r" (f), "r" (g)); + } while(line != page); +} + +/* Cypress is also IO cache coherent. */ +static void cypress_flush_page_for_dma(unsigned long page) +{ +} + +/* Cypress has unified L2 VIPT, from which both instructions and data + * are stored. It does not have an onboard icache of any sort, therefore + * no flush is necessary. + */ +static void cypress_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) +{ +} + +static void cypress_flush_tlb_all(void) +{ + srmmu_flush_whole_tlb(); +} + +static void cypress_flush_tlb_mm(struct mm_struct *mm) +{ + FLUSH_BEGIN(mm) + __asm__ __volatile__( + "lda [%0] %3, %%g5\n\t" + "sta %2, [%0] %3\n\t" + "sta %%g0, [%1] %4\n\t" + "sta %%g5, [%0] %3\n" + : /* no outputs */ + : "r" (SRMMU_CTX_REG), "r" (0x300), "r" (mm->context), + "i" (ASI_M_MMUREGS), "i" (ASI_M_FLUSH_PROBE) + : "g5"); + FLUSH_END +} + +static void cypress_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) +{ + struct mm_struct *mm = vma->vm_mm; + unsigned long size; + + FLUSH_BEGIN(mm) + start &= SRMMU_PGDIR_MASK; + size = SRMMU_PGDIR_ALIGN(end) - start; + __asm__ __volatile__( + "lda [%0] %5, %%g5\n\t" + "sta %1, [%0] %5\n" + "1:\n\t" + "subcc %3, %4, %3\n\t" + "bne 1b\n\t" + " sta %%g0, [%2 + %3] %6\n\t" + "sta %%g5, [%0] %5\n" + : /* no outputs */ + : "r" (SRMMU_CTX_REG), "r" (mm->context), "r" (start | 0x200), + "r" (size), "r" (SRMMU_PGDIR_SIZE), "i" (ASI_M_MMUREGS), + "i" (ASI_M_FLUSH_PROBE) + : "g5", "cc"); + FLUSH_END +} + +static void cypress_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) +{ + struct mm_struct *mm = vma->vm_mm; + + FLUSH_BEGIN(mm) + __asm__ __volatile__( + "lda [%0] %3, %%g5\n\t" + "sta %1, [%0] %3\n\t" + "sta %%g0, [%2] %4\n\t" + "sta %%g5, [%0] %3\n" + : /* no outputs */ + : "r" (SRMMU_CTX_REG), "r" (mm->context), "r" (page & PAGE_MASK), + "i" (ASI_M_MMUREGS), "i" (ASI_M_FLUSH_PROBE) + : "g5"); + FLUSH_END +} + +/* viking.S */ +extern void viking_flush_cache_all(void); +extern void viking_flush_cache_mm(struct mm_struct *mm); +extern void viking_flush_cache_range(struct vm_area_struct *vma, unsigned long start, + unsigned long end); +extern void viking_flush_cache_page(struct vm_area_struct *vma, unsigned long page); +extern void viking_flush_page_to_ram(unsigned long page); +extern void viking_flush_page_for_dma(unsigned long page); +extern void viking_flush_sig_insns(struct mm_struct *mm, unsigned long addr); +extern void viking_flush_page(unsigned long page); +extern void viking_mxcc_flush_page(unsigned long page); +extern void viking_flush_tlb_all(void); +extern void viking_flush_tlb_mm(struct mm_struct *mm); +extern void viking_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, + unsigned long end); +extern void viking_flush_tlb_page(struct vm_area_struct *vma, + unsigned long page); +extern void sun4dsmp_flush_tlb_all(void); +extern void sun4dsmp_flush_tlb_mm(struct mm_struct *mm); +extern void sun4dsmp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, + unsigned long end); +extern void sun4dsmp_flush_tlb_page(struct vm_area_struct *vma, + unsigned long page); + +/* hypersparc.S */ +extern void hypersparc_flush_cache_all(void); +extern void hypersparc_flush_cache_mm(struct mm_struct *mm); +extern void hypersparc_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); +extern void hypersparc_flush_cache_page(struct vm_area_struct *vma, unsigned long page); +extern void hypersparc_flush_page_to_ram(unsigned long page); +extern void hypersparc_flush_page_for_dma(unsigned long page); +extern void hypersparc_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr); +extern void hypersparc_flush_tlb_all(void); +extern void hypersparc_flush_tlb_mm(struct mm_struct *mm); +extern void hypersparc_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); +extern void hypersparc_flush_tlb_page(struct vm_area_struct *vma, unsigned long page); +extern void hypersparc_setup_blockops(void); + +/* + * NOTE: All of this startup code assumes the low 16mb (approx.) of + * kernel mappings are done with one single contiguous chunk of + * ram. On small ram machines (classics mainly) we only get + * around 8mb mapped for us. + */ + +void __init early_pgtable_allocfail(char *type) +{ + prom_printf("inherit_prom_mappings: Cannot alloc kernel %s.\n", type); + prom_halt(); +} + +void __init srmmu_early_allocate_ptable_skeleton(unsigned long start, unsigned long end) +{ + pgd_t *pgdp; + pmd_t *pmdp; + pte_t *ptep; + + while(start < end) { + pgdp = pgd_offset_k(start); + if(srmmu_pgd_none(*(pgd_t *)__nocache_fix(pgdp))) { + pmdp = (pmd_t *) __srmmu_get_nocache( + SRMMU_PMD_TABLE_SIZE, SRMMU_PMD_TABLE_SIZE); + if (pmdp == NULL) + early_pgtable_allocfail("pmd"); + memset(__nocache_fix(pmdp), 0, SRMMU_PMD_TABLE_SIZE); + srmmu_pgd_set(__nocache_fix(pgdp), pmdp); + } + pmdp = srmmu_pmd_offset(__nocache_fix(pgdp), start); + if(srmmu_pmd_none(*(pmd_t *)__nocache_fix(pmdp))) { + ptep = (pte_t *)__srmmu_get_nocache(PTE_SIZE, PTE_SIZE); + if (ptep == NULL) + early_pgtable_allocfail("pte"); + memset(__nocache_fix(ptep), 0, PTE_SIZE); + srmmu_pmd_set(__nocache_fix(pmdp), ptep); + } + if (start > (0xffffffffUL - PMD_SIZE)) + break; + start = (start + PMD_SIZE) & PMD_MASK; + } +} + +void __init srmmu_allocate_ptable_skeleton(unsigned long start, unsigned long end) +{ + pgd_t *pgdp; + pmd_t *pmdp; + pte_t *ptep; + + while(start < end) { + pgdp = pgd_offset_k(start); + if(srmmu_pgd_none(*pgdp)) { + pmdp = (pmd_t *)__srmmu_get_nocache(SRMMU_PMD_TABLE_SIZE, SRMMU_PMD_TABLE_SIZE); + if (pmdp == NULL) + early_pgtable_allocfail("pmd"); + memset(pmdp, 0, SRMMU_PMD_TABLE_SIZE); + srmmu_pgd_set(pgdp, pmdp); + } + pmdp = srmmu_pmd_offset(pgdp, start); + if(srmmu_pmd_none(*pmdp)) { + ptep = (pte_t *) __srmmu_get_nocache(PTE_SIZE, + PTE_SIZE); + if (ptep == NULL) + early_pgtable_allocfail("pte"); + memset(ptep, 0, PTE_SIZE); + srmmu_pmd_set(pmdp, ptep); + } + if (start > (0xffffffffUL - PMD_SIZE)) + break; + start = (start + PMD_SIZE) & PMD_MASK; + } +} + +/* + * This is much cleaner than poking around physical address space + * looking at the prom's page table directly which is what most + * other OS's do. Yuck... this is much better. + */ +void __init srmmu_inherit_prom_mappings(unsigned long start,unsigned long end) +{ + pgd_t *pgdp; + pmd_t *pmdp; + pte_t *ptep; + int what = 0; /* 0 = normal-pte, 1 = pmd-level pte, 2 = pgd-level pte */ + unsigned long prompte; + + while(start <= end) { + if (start == 0) + break; /* probably wrap around */ + if(start == 0xfef00000) + start = KADB_DEBUGGER_BEGVM; + if(!(prompte = srmmu_hwprobe(start))) { + start += PAGE_SIZE; + continue; + } + + /* A red snapper, see what it really is. */ + what = 0; + + if(!(start & ~(SRMMU_REAL_PMD_MASK))) { + if(srmmu_hwprobe((start-PAGE_SIZE) + SRMMU_REAL_PMD_SIZE) == prompte) + what = 1; + } + + if(!(start & ~(SRMMU_PGDIR_MASK))) { + if(srmmu_hwprobe((start-PAGE_SIZE) + SRMMU_PGDIR_SIZE) == + prompte) + what = 2; + } + + pgdp = pgd_offset_k(start); + if(what == 2) { + *(pgd_t *)__nocache_fix(pgdp) = __pgd(prompte); + start += SRMMU_PGDIR_SIZE; + continue; + } + if(srmmu_pgd_none(*(pgd_t *)__nocache_fix(pgdp))) { + pmdp = (pmd_t *)__srmmu_get_nocache(SRMMU_PMD_TABLE_SIZE, SRMMU_PMD_TABLE_SIZE); + if (pmdp == NULL) + early_pgtable_allocfail("pmd"); + memset(__nocache_fix(pmdp), 0, SRMMU_PMD_TABLE_SIZE); + srmmu_pgd_set(__nocache_fix(pgdp), pmdp); + } + pmdp = srmmu_pmd_offset(__nocache_fix(pgdp), start); + if(srmmu_pmd_none(*(pmd_t *)__nocache_fix(pmdp))) { + ptep = (pte_t *) __srmmu_get_nocache(PTE_SIZE, + PTE_SIZE); + if (ptep == NULL) + early_pgtable_allocfail("pte"); + memset(__nocache_fix(ptep), 0, PTE_SIZE); + srmmu_pmd_set(__nocache_fix(pmdp), ptep); + } + if(what == 1) { + /* + * We bend the rule where all 16 PTPs in a pmd_t point + * inside the same PTE page, and we leak a perfectly + * good hardware PTE piece. Alternatives seem worse. + */ + unsigned int x; /* Index of HW PMD in soft cluster */ + x = (start >> PMD_SHIFT) & 15; + *(unsigned long *)__nocache_fix(&pmdp->pmdv[x]) = prompte; + start += SRMMU_REAL_PMD_SIZE; + continue; + } + ptep = srmmu_pte_offset(__nocache_fix(pmdp), start); + *(pte_t *)__nocache_fix(ptep) = __pte(prompte); + start += PAGE_SIZE; + } +} + +#define KERNEL_PTE(page_shifted) ((page_shifted)|SRMMU_CACHE|SRMMU_PRIV|SRMMU_VALID) + +/* Create a third-level SRMMU 16MB page mapping. */ +static void __init do_large_mapping(unsigned long vaddr, unsigned long phys_base) +{ + pgd_t *pgdp = pgd_offset_k(vaddr); + unsigned long big_pte; + + big_pte = KERNEL_PTE(phys_base >> 4); + *(pgd_t *)__nocache_fix(pgdp) = __pgd(big_pte); +} + +/* Map sp_bank entry SP_ENTRY, starting at virtual address VBASE. */ +static unsigned long __init map_spbank(unsigned long vbase, int sp_entry) +{ + unsigned long pstart = (sp_banks[sp_entry].base_addr & SRMMU_PGDIR_MASK); + unsigned long vstart = (vbase & SRMMU_PGDIR_MASK); + unsigned long vend = SRMMU_PGDIR_ALIGN(vbase + sp_banks[sp_entry].num_bytes); + /* Map "low" memory only */ + const unsigned long min_vaddr = PAGE_OFFSET; + const unsigned long max_vaddr = PAGE_OFFSET + SRMMU_MAXMEM; + + if (vstart < min_vaddr || vstart >= max_vaddr) + return vstart; + + if (vend > max_vaddr || vend < min_vaddr) + vend = max_vaddr; + + while(vstart < vend) { + do_large_mapping(vstart, pstart); + vstart += SRMMU_PGDIR_SIZE; pstart += SRMMU_PGDIR_SIZE; + } + return vstart; +} + +static inline void memprobe_error(char *msg) +{ + prom_printf(msg); + prom_printf("Halting now...\n"); + prom_halt(); +} + +static inline void map_kernel(void) +{ + int i; + + if (phys_base > 0) { + do_large_mapping(PAGE_OFFSET, phys_base); + } + + for (i = 0; sp_banks[i].num_bytes != 0; i++) { + map_spbank((unsigned long)__va(sp_banks[i].base_addr), i); + } + + BTFIXUPSET_SIMM13(user_ptrs_per_pgd, PAGE_OFFSET / SRMMU_PGDIR_SIZE); +} + +/* Paging initialization on the Sparc Reference MMU. */ +extern void sparc_context_init(int); + +void (*poke_srmmu)(void) __initdata = NULL; + +extern unsigned long bootmem_init(unsigned long *pages_avail); + +void __init srmmu_paging_init(void) +{ + int i, cpunode; + char node_str[128]; + pgd_t *pgd; + pmd_t *pmd; + pte_t *pte; + unsigned long pages_avail; + + sparc_iomap.start = SUN4M_IOBASE_VADDR; /* 16MB of IOSPACE on all sun4m's. */ + + if (sparc_cpu_model == sun4d) + num_contexts = 65536; /* We know it is Viking */ + else { + /* Find the number of contexts on the srmmu. */ + cpunode = prom_getchild(prom_root_node); + num_contexts = 0; + while(cpunode != 0) { + prom_getstring(cpunode, "device_type", node_str, sizeof(node_str)); + if(!strcmp(node_str, "cpu")) { + num_contexts = prom_getintdefault(cpunode, "mmu-nctx", 0x8); + break; + } + cpunode = prom_getsibling(cpunode); + } + } + + if(!num_contexts) { + prom_printf("Something wrong, can't find cpu node in paging_init.\n"); + prom_halt(); + } + + pages_avail = 0; + last_valid_pfn = bootmem_init(&pages_avail); + + srmmu_nocache_calcsize(); + srmmu_nocache_init(); + srmmu_inherit_prom_mappings(0xfe400000,(LINUX_OPPROM_ENDVM-PAGE_SIZE)); + map_kernel(); + + /* ctx table has to be physically aligned to its size */ + srmmu_context_table = (ctxd_t *)__srmmu_get_nocache(num_contexts*sizeof(ctxd_t), num_contexts*sizeof(ctxd_t)); + srmmu_ctx_table_phys = (ctxd_t *)__nocache_pa((unsigned long)srmmu_context_table); + + for(i = 0; i < num_contexts; i++) + srmmu_ctxd_set((ctxd_t *)__nocache_fix(&srmmu_context_table[i]), srmmu_swapper_pg_dir); + + flush_cache_all(); + srmmu_set_ctable_ptr((unsigned long)srmmu_ctx_table_phys); + flush_tlb_all(); + poke_srmmu(); + +#ifdef CONFIG_SUN_IO + srmmu_allocate_ptable_skeleton(sparc_iomap.start, IOBASE_END); + srmmu_allocate_ptable_skeleton(DVMA_VADDR, DVMA_END); +#endif + + srmmu_allocate_ptable_skeleton( + __fix_to_virt(__end_of_fixed_addresses - 1), FIXADDR_TOP); + srmmu_allocate_ptable_skeleton(PKMAP_BASE, PKMAP_END); + + pgd = pgd_offset_k(PKMAP_BASE); + pmd = srmmu_pmd_offset(pgd, PKMAP_BASE); + pte = srmmu_pte_offset(pmd, PKMAP_BASE); + pkmap_page_table = pte; + + flush_cache_all(); + flush_tlb_all(); + + sparc_context_init(num_contexts); + + kmap_init(); + + { + unsigned long zones_size[MAX_NR_ZONES]; + unsigned long zholes_size[MAX_NR_ZONES]; + unsigned long npages; + int znum; + + for (znum = 0; znum < MAX_NR_ZONES; znum++) + zones_size[znum] = zholes_size[znum] = 0; + + npages = max_low_pfn - pfn_base; + + zones_size[ZONE_DMA] = npages; + zholes_size[ZONE_DMA] = npages - pages_avail; + + npages = highend_pfn - max_low_pfn; + zones_size[ZONE_HIGHMEM] = npages; + zholes_size[ZONE_HIGHMEM] = npages - calc_highpages(); + + free_area_init_node(0, &contig_page_data, zones_size, + pfn_base, zholes_size); + } +} + +static void srmmu_mmu_info(struct seq_file *m) +{ + seq_printf(m, + "MMU type\t: %s\n" + "contexts\t: %d\n" + "nocache total\t: %ld\n" + "nocache used\t: %d\n", + srmmu_name, + num_contexts, + srmmu_nocache_size, + srmmu_nocache_map.used << SRMMU_NOCACHE_BITMAP_SHIFT); +} + +static void srmmu_update_mmu_cache(struct vm_area_struct * vma, unsigned long address, pte_t pte) +{ +} + +static void srmmu_destroy_context(struct mm_struct *mm) +{ + + if(mm->context != NO_CONTEXT) { + flush_cache_mm(mm); + srmmu_ctxd_set(&srmmu_context_table[mm->context], srmmu_swapper_pg_dir); + flush_tlb_mm(mm); + spin_lock(&srmmu_context_spinlock); + free_context(mm->context); + spin_unlock(&srmmu_context_spinlock); + mm->context = NO_CONTEXT; + } +} + +/* Init various srmmu chip types. */ +static void __init srmmu_is_bad(void) +{ + prom_printf("Could not determine SRMMU chip type.\n"); + prom_halt(); +} + +static void __init init_vac_layout(void) +{ + int nd, cache_lines; + char node_str[128]; +#ifdef CONFIG_SMP + int cpu = 0; + unsigned long max_size = 0; + unsigned long min_line_size = 0x10000000; +#endif + + nd = prom_getchild(prom_root_node); + while((nd = prom_getsibling(nd)) != 0) { + prom_getstring(nd, "device_type", node_str, sizeof(node_str)); + if(!strcmp(node_str, "cpu")) { + vac_line_size = prom_getint(nd, "cache-line-size"); + if (vac_line_size == -1) { + prom_printf("can't determine cache-line-size, " + "halting.\n"); + prom_halt(); + } + cache_lines = prom_getint(nd, "cache-nlines"); + if (cache_lines == -1) { + prom_printf("can't determine cache-nlines, halting.\n"); + prom_halt(); + } + + vac_cache_size = cache_lines * vac_line_size; +#ifdef CONFIG_SMP + if(vac_cache_size > max_size) + max_size = vac_cache_size; + if(vac_line_size < min_line_size) + min_line_size = vac_line_size; + cpu++; + if (cpu >= NR_CPUS || !cpu_online(cpu)) + break; +#else + break; +#endif + } + } + if(nd == 0) { + prom_printf("No CPU nodes found, halting.\n"); + prom_halt(); + } +#ifdef CONFIG_SMP + vac_cache_size = max_size; + vac_line_size = min_line_size; +#endif + printk("SRMMU: Using VAC size of %d bytes, line size %d bytes.\n", + (int)vac_cache_size, (int)vac_line_size); +} + +static void __init poke_hypersparc(void) +{ + volatile unsigned long clear; + unsigned long mreg = srmmu_get_mmureg(); + + hyper_flush_unconditional_combined(); + + mreg &= ~(HYPERSPARC_CWENABLE); + mreg |= (HYPERSPARC_CENABLE | HYPERSPARC_WBENABLE); + mreg |= (HYPERSPARC_CMODE); + + srmmu_set_mmureg(mreg); + +#if 0 /* XXX I think this is bad news... -DaveM */ + hyper_clear_all_tags(); +#endif + + put_ross_icr(HYPERSPARC_ICCR_FTD | HYPERSPARC_ICCR_ICE); + hyper_flush_whole_icache(); + clear = srmmu_get_faddr(); + clear = srmmu_get_fstatus(); +} + +static void __init init_hypersparc(void) +{ + srmmu_name = "ROSS HyperSparc"; + srmmu_modtype = HyperSparc; + + init_vac_layout(); + + is_hypersparc = 1; + + BTFIXUPSET_CALL(pte_clear, srmmu_pte_clear, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pmd_clear, srmmu_pmd_clear, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pgd_clear, srmmu_pgd_clear, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_all, hypersparc_flush_cache_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_mm, hypersparc_flush_cache_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_range, hypersparc_flush_cache_range, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_page, hypersparc_flush_cache_page, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(flush_tlb_all, hypersparc_flush_tlb_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_mm, hypersparc_flush_tlb_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_range, hypersparc_flush_tlb_range, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_page, hypersparc_flush_tlb_page, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(__flush_page_to_ram, hypersparc_flush_page_to_ram, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_sig_insns, hypersparc_flush_sig_insns, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_page_for_dma, hypersparc_flush_page_for_dma, BTFIXUPCALL_NOP); + + + poke_srmmu = poke_hypersparc; + + hypersparc_setup_blockops(); +} + +static void __init poke_cypress(void) +{ + unsigned long mreg = srmmu_get_mmureg(); + unsigned long faddr, tagval; + volatile unsigned long cypress_sucks; + volatile unsigned long clear; + + clear = srmmu_get_faddr(); + clear = srmmu_get_fstatus(); + + if (!(mreg & CYPRESS_CENABLE)) { + for(faddr = 0x0; faddr < 0x10000; faddr += 20) { + __asm__ __volatile__("sta %%g0, [%0 + %1] %2\n\t" + "sta %%g0, [%0] %2\n\t" : : + "r" (faddr), "r" (0x40000), + "i" (ASI_M_DATAC_TAG)); + } + } else { + for(faddr = 0; faddr < 0x10000; faddr += 0x20) { + __asm__ __volatile__("lda [%1 + %2] %3, %0\n\t" : + "=r" (tagval) : + "r" (faddr), "r" (0x40000), + "i" (ASI_M_DATAC_TAG)); + + /* If modified and valid, kick it. */ + if((tagval & 0x60) == 0x60) + cypress_sucks = *(unsigned long *) + (0xf0020000 + faddr); + } + } + + /* And one more, for our good neighbor, Mr. Broken Cypress. */ + clear = srmmu_get_faddr(); + clear = srmmu_get_fstatus(); + + mreg |= (CYPRESS_CENABLE | CYPRESS_CMODE); + srmmu_set_mmureg(mreg); +} + +static void __init init_cypress_common(void) +{ + init_vac_layout(); + + BTFIXUPSET_CALL(pte_clear, srmmu_pte_clear, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pmd_clear, srmmu_pmd_clear, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pgd_clear, srmmu_pgd_clear, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_all, cypress_flush_cache_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_mm, cypress_flush_cache_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_range, cypress_flush_cache_range, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_page, cypress_flush_cache_page, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(flush_tlb_all, cypress_flush_tlb_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_mm, cypress_flush_tlb_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_page, cypress_flush_tlb_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_range, cypress_flush_tlb_range, BTFIXUPCALL_NORM); + + + BTFIXUPSET_CALL(__flush_page_to_ram, cypress_flush_page_to_ram, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_sig_insns, cypress_flush_sig_insns, BTFIXUPCALL_NOP); + BTFIXUPSET_CALL(flush_page_for_dma, cypress_flush_page_for_dma, BTFIXUPCALL_NOP); + + poke_srmmu = poke_cypress; +} + +static void __init init_cypress_604(void) +{ + srmmu_name = "ROSS Cypress-604(UP)"; + srmmu_modtype = Cypress; + init_cypress_common(); +} + +static void __init init_cypress_605(unsigned long mrev) +{ + srmmu_name = "ROSS Cypress-605(MP)"; + if(mrev == 0xe) { + srmmu_modtype = Cypress_vE; + hwbug_bitmask |= HWBUG_COPYBACK_BROKEN; + } else { + if(mrev == 0xd) { + srmmu_modtype = Cypress_vD; + hwbug_bitmask |= HWBUG_ASIFLUSH_BROKEN; + } else { + srmmu_modtype = Cypress; + } + } + init_cypress_common(); +} + +static void __init poke_swift(void) +{ + unsigned long mreg; + + /* Clear any crap from the cache or else... */ + swift_flush_cache_all(); + + /* Enable I & D caches */ + mreg = srmmu_get_mmureg(); + mreg |= (SWIFT_IE | SWIFT_DE); + /* + * The Swift branch folding logic is completely broken. At + * trap time, if things are just right, if can mistakenly + * think that a trap is coming from kernel mode when in fact + * it is coming from user mode (it mis-executes the branch in + * the trap code). So you see things like crashme completely + * hosing your machine which is completely unacceptable. Turn + * this shit off... nice job Fujitsu. + */ + mreg &= ~(SWIFT_BF); + srmmu_set_mmureg(mreg); +} + +#define SWIFT_MASKID_ADDR 0x10003018 +static void __init init_swift(void) +{ + unsigned long swift_rev; + + __asm__ __volatile__("lda [%1] %2, %0\n\t" + "srl %0, 0x18, %0\n\t" : + "=r" (swift_rev) : + "r" (SWIFT_MASKID_ADDR), "i" (ASI_M_BYPASS)); + srmmu_name = "Fujitsu Swift"; + switch(swift_rev) { + case 0x11: + case 0x20: + case 0x23: + case 0x30: + srmmu_modtype = Swift_lots_o_bugs; + hwbug_bitmask |= (HWBUG_KERN_ACCBROKEN | HWBUG_KERN_CBITBROKEN); + /* + * Gee george, I wonder why Sun is so hush hush about + * this hardware bug... really braindamage stuff going + * on here. However I think we can find a way to avoid + * all of the workaround overhead under Linux. Basically, + * any page fault can cause kernel pages to become user + * accessible (the mmu gets confused and clears some of + * the ACC bits in kernel ptes). Aha, sounds pretty + * horrible eh? But wait, after extensive testing it appears + * that if you use pgd_t level large kernel pte's (like the + * 4MB pages on the Pentium) the bug does not get tripped + * at all. This avoids almost all of the major overhead. + * Welcome to a world where your vendor tells you to, + * "apply this kernel patch" instead of "sorry for the + * broken hardware, send it back and we'll give you + * properly functioning parts" + */ + break; + case 0x25: + case 0x31: + srmmu_modtype = Swift_bad_c; + hwbug_bitmask |= HWBUG_KERN_CBITBROKEN; + /* + * You see Sun allude to this hardware bug but never + * admit things directly, they'll say things like, + * "the Swift chip cache problems" or similar. + */ + break; + default: + srmmu_modtype = Swift_ok; + break; + }; + + BTFIXUPSET_CALL(flush_cache_all, swift_flush_cache_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_mm, swift_flush_cache_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_page, swift_flush_cache_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_range, swift_flush_cache_range, BTFIXUPCALL_NORM); + + + BTFIXUPSET_CALL(flush_tlb_all, swift_flush_tlb_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_mm, swift_flush_tlb_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_page, swift_flush_tlb_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_range, swift_flush_tlb_range, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(__flush_page_to_ram, swift_flush_page_to_ram, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_sig_insns, swift_flush_sig_insns, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_page_for_dma, swift_flush_page_for_dma, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(update_mmu_cache, swift_update_mmu_cache, BTFIXUPCALL_NORM); + + flush_page_for_dma_global = 0; + + /* + * Are you now convinced that the Swift is one of the + * biggest VLSI abortions of all time? Bravo Fujitsu! + * Fujitsu, the !#?!%$'d up processor people. I bet if + * you examined the microcode of the Swift you'd find + * XXX's all over the place. + */ + poke_srmmu = poke_swift; +} + +static void turbosparc_flush_cache_all(void) +{ + flush_user_windows(); + turbosparc_idflash_clear(); +} + +static void turbosparc_flush_cache_mm(struct mm_struct *mm) +{ + FLUSH_BEGIN(mm) + flush_user_windows(); + turbosparc_idflash_clear(); + FLUSH_END +} + +static void turbosparc_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) +{ + FLUSH_BEGIN(vma->vm_mm) + flush_user_windows(); + turbosparc_idflash_clear(); + FLUSH_END +} + +static void turbosparc_flush_cache_page(struct vm_area_struct *vma, unsigned long page) +{ + FLUSH_BEGIN(vma->vm_mm) + flush_user_windows(); + if (vma->vm_flags & VM_EXEC) + turbosparc_flush_icache(); + turbosparc_flush_dcache(); + FLUSH_END +} + +/* TurboSparc is copy-back, if we turn it on, but this does not work. */ +static void turbosparc_flush_page_to_ram(unsigned long page) +{ +#ifdef TURBOSPARC_WRITEBACK + volatile unsigned long clear; + + if (srmmu_hwprobe(page)) + turbosparc_flush_page_cache(page); + clear = srmmu_get_fstatus(); +#endif +} + +static void turbosparc_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) +{ +} + +static void turbosparc_flush_page_for_dma(unsigned long page) +{ + turbosparc_flush_dcache(); +} + +static void turbosparc_flush_tlb_all(void) +{ + srmmu_flush_whole_tlb(); +} + +static void turbosparc_flush_tlb_mm(struct mm_struct *mm) +{ + FLUSH_BEGIN(mm) + srmmu_flush_whole_tlb(); + FLUSH_END +} + +static void turbosparc_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) +{ + FLUSH_BEGIN(vma->vm_mm) + srmmu_flush_whole_tlb(); + FLUSH_END +} + +static void turbosparc_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) +{ + FLUSH_BEGIN(vma->vm_mm) + srmmu_flush_whole_tlb(); + FLUSH_END +} + + +static void __init poke_turbosparc(void) +{ + unsigned long mreg = srmmu_get_mmureg(); + unsigned long ccreg; + + /* Clear any crap from the cache or else... */ + turbosparc_flush_cache_all(); + mreg &= ~(TURBOSPARC_ICENABLE | TURBOSPARC_DCENABLE); /* Temporarily disable I & D caches */ + mreg &= ~(TURBOSPARC_PCENABLE); /* Don't check parity */ + srmmu_set_mmureg(mreg); + + ccreg = turbosparc_get_ccreg(); + +#ifdef TURBOSPARC_WRITEBACK + ccreg |= (TURBOSPARC_SNENABLE); /* Do DVMA snooping in Dcache */ + ccreg &= ~(TURBOSPARC_uS2 | TURBOSPARC_WTENABLE); + /* Write-back D-cache, emulate VLSI + * abortion number three, not number one */ +#else + /* For now let's play safe, optimize later */ + ccreg |= (TURBOSPARC_SNENABLE | TURBOSPARC_WTENABLE); + /* Do DVMA snooping in Dcache, Write-thru D-cache */ + ccreg &= ~(TURBOSPARC_uS2); + /* Emulate VLSI abortion number three, not number one */ +#endif + + switch (ccreg & 7) { + case 0: /* No SE cache */ + case 7: /* Test mode */ + break; + default: + ccreg |= (TURBOSPARC_SCENABLE); + } + turbosparc_set_ccreg (ccreg); + + mreg |= (TURBOSPARC_ICENABLE | TURBOSPARC_DCENABLE); /* I & D caches on */ + mreg |= (TURBOSPARC_ICSNOOP); /* Icache snooping on */ + srmmu_set_mmureg(mreg); +} + +static void __init init_turbosparc(void) +{ + srmmu_name = "Fujitsu TurboSparc"; + srmmu_modtype = TurboSparc; + + BTFIXUPSET_CALL(flush_cache_all, turbosparc_flush_cache_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_mm, turbosparc_flush_cache_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_page, turbosparc_flush_cache_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_range, turbosparc_flush_cache_range, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(flush_tlb_all, turbosparc_flush_tlb_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_mm, turbosparc_flush_tlb_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_page, turbosparc_flush_tlb_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_range, turbosparc_flush_tlb_range, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(__flush_page_to_ram, turbosparc_flush_page_to_ram, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(flush_sig_insns, turbosparc_flush_sig_insns, BTFIXUPCALL_NOP); + BTFIXUPSET_CALL(flush_page_for_dma, turbosparc_flush_page_for_dma, BTFIXUPCALL_NORM); + + poke_srmmu = poke_turbosparc; +} + +static void __init poke_tsunami(void) +{ + unsigned long mreg = srmmu_get_mmureg(); + + tsunami_flush_icache(); + tsunami_flush_dcache(); + mreg &= ~TSUNAMI_ITD; + mreg |= (TSUNAMI_IENAB | TSUNAMI_DENAB); + srmmu_set_mmureg(mreg); +} + +static void __init init_tsunami(void) +{ + /* + * Tsunami's pretty sane, Sun and TI actually got it + * somewhat right this time. Fujitsu should have + * taken some lessons from them. + */ + + srmmu_name = "TI Tsunami"; + srmmu_modtype = Tsunami; + + BTFIXUPSET_CALL(flush_cache_all, tsunami_flush_cache_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_mm, tsunami_flush_cache_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_page, tsunami_flush_cache_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_range, tsunami_flush_cache_range, BTFIXUPCALL_NORM); + + + BTFIXUPSET_CALL(flush_tlb_all, tsunami_flush_tlb_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_mm, tsunami_flush_tlb_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_page, tsunami_flush_tlb_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_range, tsunami_flush_tlb_range, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(__flush_page_to_ram, tsunami_flush_page_to_ram, BTFIXUPCALL_NOP); + BTFIXUPSET_CALL(flush_sig_insns, tsunami_flush_sig_insns, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_page_for_dma, tsunami_flush_page_for_dma, BTFIXUPCALL_NORM); + + poke_srmmu = poke_tsunami; + + tsunami_setup_blockops(); +} + +static void __init poke_viking(void) +{ + unsigned long mreg = srmmu_get_mmureg(); + static int smp_catch; + + if(viking_mxcc_present) { + unsigned long mxcc_control = mxcc_get_creg(); + + mxcc_control |= (MXCC_CTL_ECE | MXCC_CTL_PRE | MXCC_CTL_MCE); + mxcc_control &= ~(MXCC_CTL_RRC); + mxcc_set_creg(mxcc_control); + + /* + * We don't need memory parity checks. + * XXX This is a mess, have to dig out later. ecd. + viking_mxcc_turn_off_parity(&mreg, &mxcc_control); + */ + + /* We do cache ptables on MXCC. */ + mreg |= VIKING_TCENABLE; + } else { + unsigned long bpreg; + + mreg &= ~(VIKING_TCENABLE); + if(smp_catch++) { + /* Must disable mixed-cmd mode here for other cpu's. */ + bpreg = viking_get_bpreg(); + bpreg &= ~(VIKING_ACTION_MIX); + viking_set_bpreg(bpreg); + + /* Just in case PROM does something funny. */ + msi_set_sync(); + } + } + + mreg |= VIKING_SPENABLE; + mreg |= (VIKING_ICENABLE | VIKING_DCENABLE); + mreg |= VIKING_SBENABLE; + mreg &= ~(VIKING_ACENABLE); + srmmu_set_mmureg(mreg); + +#ifdef CONFIG_SMP + /* Avoid unnecessary cross calls. */ + BTFIXUPCOPY_CALL(flush_cache_all, local_flush_cache_all); + BTFIXUPCOPY_CALL(flush_cache_mm, local_flush_cache_mm); + BTFIXUPCOPY_CALL(flush_cache_range, local_flush_cache_range); + BTFIXUPCOPY_CALL(flush_cache_page, local_flush_cache_page); + BTFIXUPCOPY_CALL(__flush_page_to_ram, local_flush_page_to_ram); + BTFIXUPCOPY_CALL(flush_sig_insns, local_flush_sig_insns); + BTFIXUPCOPY_CALL(flush_page_for_dma, local_flush_page_for_dma); + btfixup(); +#endif +} + +static void __init init_viking(void) +{ + unsigned long mreg = srmmu_get_mmureg(); + + /* Ahhh, the viking. SRMMU VLSI abortion number two... */ + if(mreg & VIKING_MMODE) { + srmmu_name = "TI Viking"; + viking_mxcc_present = 0; + msi_set_sync(); + + BTFIXUPSET_CALL(pte_clear, srmmu_pte_clear, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pmd_clear, srmmu_pmd_clear, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pgd_clear, srmmu_pgd_clear, BTFIXUPCALL_NORM); + + /* + * We need this to make sure old viking takes no hits + * on it's cache for dma snoops to workaround the + * "load from non-cacheable memory" interrupt bug. + * This is only necessary because of the new way in + * which we use the IOMMU. + */ + BTFIXUPSET_CALL(flush_page_for_dma, viking_flush_page, BTFIXUPCALL_NORM); + + flush_page_for_dma_global = 0; + } else { + srmmu_name = "TI Viking/MXCC"; + viking_mxcc_present = 1; + + srmmu_cache_pagetables = 1; + + /* MXCC vikings lack the DMA snooping bug. */ + BTFIXUPSET_CALL(flush_page_for_dma, viking_flush_page_for_dma, BTFIXUPCALL_NOP); + } + + BTFIXUPSET_CALL(flush_cache_all, viking_flush_cache_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_mm, viking_flush_cache_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_page, viking_flush_cache_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_range, viking_flush_cache_range, BTFIXUPCALL_NORM); + +#ifdef CONFIG_SMP + if (sparc_cpu_model == sun4d) { + BTFIXUPSET_CALL(flush_tlb_all, sun4dsmp_flush_tlb_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_mm, sun4dsmp_flush_tlb_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_page, sun4dsmp_flush_tlb_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_range, sun4dsmp_flush_tlb_range, BTFIXUPCALL_NORM); + } else +#endif + { + BTFIXUPSET_CALL(flush_tlb_all, viking_flush_tlb_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_mm, viking_flush_tlb_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_page, viking_flush_tlb_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_range, viking_flush_tlb_range, BTFIXUPCALL_NORM); + } + + BTFIXUPSET_CALL(__flush_page_to_ram, viking_flush_page_to_ram, BTFIXUPCALL_NOP); + BTFIXUPSET_CALL(flush_sig_insns, viking_flush_sig_insns, BTFIXUPCALL_NOP); + + poke_srmmu = poke_viking; +} + +/* Probe for the srmmu chip version. */ +static void __init get_srmmu_type(void) +{ + unsigned long mreg, psr; + unsigned long mod_typ, mod_rev, psr_typ, psr_vers; + + srmmu_modtype = SRMMU_INVAL_MOD; + hwbug_bitmask = 0; + + mreg = srmmu_get_mmureg(); psr = get_psr(); + mod_typ = (mreg & 0xf0000000) >> 28; + mod_rev = (mreg & 0x0f000000) >> 24; + psr_typ = (psr >> 28) & 0xf; + psr_vers = (psr >> 24) & 0xf; + + /* First, check for HyperSparc or Cypress. */ + if(mod_typ == 1) { + switch(mod_rev) { + case 7: + /* UP or MP Hypersparc */ + init_hypersparc(); + break; + case 0: + case 2: + /* Uniprocessor Cypress */ + init_cypress_604(); + break; + case 10: + case 11: + case 12: + /* _REALLY OLD_ Cypress MP chips... */ + case 13: + case 14: + case 15: + /* MP Cypress mmu/cache-controller */ + init_cypress_605(mod_rev); + break; + default: + /* Some other Cypress revision, assume a 605. */ + init_cypress_605(mod_rev); + break; + }; + return; + } + + /* + * Now Fujitsu TurboSparc. It might happen that it is + * in Swift emulation mode, so we will check later... + */ + if (psr_typ == 0 && psr_vers == 5) { + init_turbosparc(); + return; + } + + /* Next check for Fujitsu Swift. */ + if(psr_typ == 0 && psr_vers == 4) { + int cpunode; + char node_str[128]; + + /* Look if it is not a TurboSparc emulating Swift... */ + cpunode = prom_getchild(prom_root_node); + while((cpunode = prom_getsibling(cpunode)) != 0) { + prom_getstring(cpunode, "device_type", node_str, sizeof(node_str)); + if(!strcmp(node_str, "cpu")) { + if (!prom_getintdefault(cpunode, "psr-implementation", 1) && + prom_getintdefault(cpunode, "psr-version", 1) == 5) { + init_turbosparc(); + return; + } + break; + } + } + + init_swift(); + return; + } + + /* Now the Viking family of srmmu. */ + if(psr_typ == 4 && + ((psr_vers == 0) || + ((psr_vers == 1) && (mod_typ == 0) && (mod_rev == 0)))) { + init_viking(); + return; + } + + /* Finally the Tsunami. */ + if(psr_typ == 4 && psr_vers == 1 && (mod_typ || mod_rev)) { + init_tsunami(); + return; + } + + /* Oh well */ + srmmu_is_bad(); +} + +/* don't laugh, static pagetables */ +static void srmmu_check_pgt_cache(int low, int high) +{ +} + +extern unsigned long spwin_mmu_patchme, fwin_mmu_patchme, + tsetup_mmu_patchme, rtrap_mmu_patchme; + +extern unsigned long spwin_srmmu_stackchk, srmmu_fwin_stackchk, + tsetup_srmmu_stackchk, srmmu_rett_stackchk; + +extern unsigned long srmmu_fault; + +#define PATCH_BRANCH(insn, dest) do { \ + iaddr = &(insn); \ + daddr = &(dest); \ + *iaddr = SPARC_BRANCH((unsigned long) daddr, (unsigned long) iaddr); \ + } while(0) + +static void __init patch_window_trap_handlers(void) +{ + unsigned long *iaddr, *daddr; + + PATCH_BRANCH(spwin_mmu_patchme, spwin_srmmu_stackchk); + PATCH_BRANCH(fwin_mmu_patchme, srmmu_fwin_stackchk); + PATCH_BRANCH(tsetup_mmu_patchme, tsetup_srmmu_stackchk); + PATCH_BRANCH(rtrap_mmu_patchme, srmmu_rett_stackchk); + PATCH_BRANCH(sparc_ttable[SP_TRAP_TFLT].inst_three, srmmu_fault); + PATCH_BRANCH(sparc_ttable[SP_TRAP_DFLT].inst_three, srmmu_fault); + PATCH_BRANCH(sparc_ttable[SP_TRAP_DACC].inst_three, srmmu_fault); +} + +#ifdef CONFIG_SMP +/* Local cross-calls. */ +static void smp_flush_page_for_dma(unsigned long page) +{ + xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_for_dma), page); + local_flush_page_for_dma(page); +} + +#endif + +static pte_t srmmu_pgoff_to_pte(unsigned long pgoff) +{ + return __pte((pgoff << SRMMU_PTE_FILE_SHIFT) | SRMMU_FILE); +} + +static unsigned long srmmu_pte_to_pgoff(pte_t pte) +{ + return pte_val(pte) >> SRMMU_PTE_FILE_SHIFT; +} + +/* Load up routines and constants for sun4m and sun4d mmu */ +void __init ld_mmu_srmmu(void) +{ + extern void ld_mmu_iommu(void); + extern void ld_mmu_iounit(void); + extern void ___xchg32_sun4md(void); + + BTFIXUPSET_SIMM13(pgdir_shift, SRMMU_PGDIR_SHIFT); + BTFIXUPSET_SETHI(pgdir_size, SRMMU_PGDIR_SIZE); + BTFIXUPSET_SETHI(pgdir_mask, SRMMU_PGDIR_MASK); + + BTFIXUPSET_SIMM13(ptrs_per_pmd, SRMMU_PTRS_PER_PMD); + BTFIXUPSET_SIMM13(ptrs_per_pgd, SRMMU_PTRS_PER_PGD); + + BTFIXUPSET_INT(page_none, pgprot_val(SRMMU_PAGE_NONE)); + BTFIXUPSET_INT(page_shared, pgprot_val(SRMMU_PAGE_SHARED)); + BTFIXUPSET_INT(page_copy, pgprot_val(SRMMU_PAGE_COPY)); + BTFIXUPSET_INT(page_readonly, pgprot_val(SRMMU_PAGE_RDONLY)); + BTFIXUPSET_INT(page_kernel, pgprot_val(SRMMU_PAGE_KERNEL)); + page_kernel = pgprot_val(SRMMU_PAGE_KERNEL); + pg_iobits = SRMMU_VALID | SRMMU_WRITE | SRMMU_REF; + + /* Functions */ +#ifndef CONFIG_SMP + BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4md, BTFIXUPCALL_SWAPG1G2); +#endif + BTFIXUPSET_CALL(do_check_pgt_cache, srmmu_check_pgt_cache, BTFIXUPCALL_NOP); + + BTFIXUPSET_CALL(set_pte, srmmu_set_pte, BTFIXUPCALL_SWAPO0O1); + BTFIXUPSET_CALL(switch_mm, srmmu_switch_mm, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(pte_pfn, srmmu_pte_pfn, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pmd_page, srmmu_pmd_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pgd_page, srmmu_pgd_page, BTFIXUPCALL_NORM); + + BTFIXUPSET_SETHI(none_mask, 0xF0000000); + + BTFIXUPSET_CALL(pte_present, srmmu_pte_present, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pte_clear, srmmu_pte_clear, BTFIXUPCALL_SWAPO0G0); + BTFIXUPSET_CALL(pte_read, srmmu_pte_read, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(pmd_bad, srmmu_pmd_bad, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pmd_present, srmmu_pmd_present, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pmd_clear, srmmu_pmd_clear, BTFIXUPCALL_SWAPO0G0); + + BTFIXUPSET_CALL(pgd_none, srmmu_pgd_none, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pgd_bad, srmmu_pgd_bad, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pgd_present, srmmu_pgd_present, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pgd_clear, srmmu_pgd_clear, BTFIXUPCALL_SWAPO0G0); + + BTFIXUPSET_CALL(mk_pte, srmmu_mk_pte, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mk_pte_phys, srmmu_mk_pte_phys, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mk_pte_io, srmmu_mk_pte_io, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pgd_set, srmmu_pgd_set, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pmd_set, srmmu_pmd_set, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pmd_populate, srmmu_pmd_populate, BTFIXUPCALL_NORM); + + BTFIXUPSET_INT(pte_modify_mask, SRMMU_CHG_MASK); + BTFIXUPSET_CALL(pmd_offset, srmmu_pmd_offset, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pte_offset_kernel, srmmu_pte_offset, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(free_pte_fast, srmmu_free_pte_fast, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pte_free, srmmu_pte_free, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pte_alloc_one_kernel, srmmu_pte_alloc_one_kernel, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pte_alloc_one, srmmu_pte_alloc_one, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(free_pmd_fast, srmmu_pmd_free, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pmd_alloc_one, srmmu_pmd_alloc_one, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(free_pgd_fast, srmmu_free_pgd_fast, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(get_pgd_fast, srmmu_get_pgd_fast, BTFIXUPCALL_NORM); + + BTFIXUPSET_HALF(pte_writei, SRMMU_WRITE); + BTFIXUPSET_HALF(pte_dirtyi, SRMMU_DIRTY); + BTFIXUPSET_HALF(pte_youngi, SRMMU_REF); + BTFIXUPSET_HALF(pte_filei, SRMMU_FILE); + BTFIXUPSET_HALF(pte_wrprotecti, SRMMU_WRITE); + BTFIXUPSET_HALF(pte_mkcleani, SRMMU_DIRTY); + BTFIXUPSET_HALF(pte_mkoldi, SRMMU_REF); + BTFIXUPSET_CALL(pte_mkwrite, srmmu_pte_mkwrite, BTFIXUPCALL_ORINT(SRMMU_WRITE)); + BTFIXUPSET_CALL(pte_mkdirty, srmmu_pte_mkdirty, BTFIXUPCALL_ORINT(SRMMU_DIRTY)); + BTFIXUPSET_CALL(pte_mkyoung, srmmu_pte_mkyoung, BTFIXUPCALL_ORINT(SRMMU_REF)); + BTFIXUPSET_CALL(update_mmu_cache, srmmu_update_mmu_cache, BTFIXUPCALL_NOP); + BTFIXUPSET_CALL(destroy_context, srmmu_destroy_context, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(sparc_mapiorange, srmmu_mapiorange, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(sparc_unmapiorange, srmmu_unmapiorange, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(__swp_type, srmmu_swp_type, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(__swp_offset, srmmu_swp_offset, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(__swp_entry, srmmu_swp_entry, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(mmu_info, srmmu_mmu_info, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(alloc_thread_info, srmmu_alloc_thread_info, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(free_thread_info, srmmu_free_thread_info, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(pte_to_pgoff, srmmu_pte_to_pgoff, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pgoff_to_pte, srmmu_pgoff_to_pte, BTFIXUPCALL_NORM); + + get_srmmu_type(); + patch_window_trap_handlers(); + +#ifdef CONFIG_SMP + /* El switcheroo... */ + + BTFIXUPCOPY_CALL(local_flush_cache_all, flush_cache_all); + BTFIXUPCOPY_CALL(local_flush_cache_mm, flush_cache_mm); + BTFIXUPCOPY_CALL(local_flush_cache_range, flush_cache_range); + BTFIXUPCOPY_CALL(local_flush_cache_page, flush_cache_page); + BTFIXUPCOPY_CALL(local_flush_tlb_all, flush_tlb_all); + BTFIXUPCOPY_CALL(local_flush_tlb_mm, flush_tlb_mm); + BTFIXUPCOPY_CALL(local_flush_tlb_range, flush_tlb_range); + BTFIXUPCOPY_CALL(local_flush_tlb_page, flush_tlb_page); + BTFIXUPCOPY_CALL(local_flush_page_to_ram, __flush_page_to_ram); + BTFIXUPCOPY_CALL(local_flush_sig_insns, flush_sig_insns); + BTFIXUPCOPY_CALL(local_flush_page_for_dma, flush_page_for_dma); + + BTFIXUPSET_CALL(flush_cache_all, smp_flush_cache_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_mm, smp_flush_cache_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_range, smp_flush_cache_range, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_page, smp_flush_cache_page, BTFIXUPCALL_NORM); + if (sparc_cpu_model != sun4d) { + BTFIXUPSET_CALL(flush_tlb_all, smp_flush_tlb_all, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_mm, smp_flush_tlb_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_range, smp_flush_tlb_range, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_page, smp_flush_tlb_page, BTFIXUPCALL_NORM); + } + BTFIXUPSET_CALL(__flush_page_to_ram, smp_flush_page_to_ram, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_sig_insns, smp_flush_sig_insns, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_page_for_dma, smp_flush_page_for_dma, BTFIXUPCALL_NORM); +#endif + + if (sparc_cpu_model == sun4d) + ld_mmu_iounit(); + else + ld_mmu_iommu(); +#ifdef CONFIG_SMP + if (sparc_cpu_model == sun4d) + sun4d_init_smp(); + else + sun4m_init_smp(); +#endif +} |
