diff options
Diffstat (limited to 'arch/sparc/mm/sun4c.c')
| -rw-r--r-- | arch/sparc/mm/sun4c.c | 2276 |
1 files changed, 2276 insertions, 0 deletions
diff --git a/arch/sparc/mm/sun4c.c b/arch/sparc/mm/sun4c.c new file mode 100644 index 0000000..1d56039 --- /dev/null +++ b/arch/sparc/mm/sun4c.c @@ -0,0 +1,2276 @@ +/* $Id: sun4c.c,v 1.212 2001/12/21 04:56:15 davem Exp $ + * sun4c.c: Doing in software what should be done in hardware. + * + * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) + * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au) + * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org) + * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + */ + +#define NR_TASK_BUCKETS 512 + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/bootmem.h> +#include <linux/highmem.h> +#include <linux/fs.h> +#include <linux/seq_file.h> + +#include <asm/scatterlist.h> +#include <asm/page.h> +#include <asm/pgalloc.h> +#include <asm/pgtable.h> +#include <asm/vaddrs.h> +#include <asm/idprom.h> +#include <asm/machines.h> +#include <asm/memreg.h> +#include <asm/processor.h> +#include <asm/auxio.h> +#include <asm/io.h> +#include <asm/oplib.h> +#include <asm/openprom.h> +#include <asm/mmu_context.h> +#include <asm/sun4paddr.h> +#include <asm/highmem.h> +#include <asm/btfixup.h> +#include <asm/cacheflush.h> +#include <asm/tlbflush.h> + +/* Because of our dynamic kernel TLB miss strategy, and how + * our DVMA mapping allocation works, you _MUST_: + * + * 1) Disable interrupts _and_ not touch any dynamic kernel + * memory while messing with kernel MMU state. By + * dynamic memory I mean any object which is not in + * the kernel image itself or a thread_union (both of + * which are locked into the MMU). + * 2) Disable interrupts while messing with user MMU state. + */ + +extern int num_segmaps, num_contexts; + +extern unsigned long page_kernel; + +#ifdef CONFIG_SUN4 +#define SUN4C_VAC_SIZE sun4c_vacinfo.num_bytes +#else +/* That's it, we prom_halt() on sun4c if the cache size is something other than 65536. + * So let's save some cycles and just use that everywhere except for that bootup + * sanity check. + */ +#define SUN4C_VAC_SIZE 65536 +#endif + +#define SUN4C_KERNEL_BUCKETS 32 + +/* Flushing the cache. */ +struct sun4c_vac_props sun4c_vacinfo; +unsigned long sun4c_kernel_faults; + +/* Invalidate every sun4c cache line tag. */ +static void __init sun4c_flush_all(void) +{ + unsigned long begin, end; + + if (sun4c_vacinfo.on) + panic("SUN4C: AIEEE, trying to invalidate vac while it is on."); + + /* Clear 'valid' bit in all cache line tags */ + begin = AC_CACHETAGS; + end = (AC_CACHETAGS + SUN4C_VAC_SIZE); + while (begin < end) { + __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : + "r" (begin), "i" (ASI_CONTROL)); + begin += sun4c_vacinfo.linesize; + } +} + +static void sun4c_flush_context_hw(void) +{ + unsigned long end = SUN4C_VAC_SIZE; + + __asm__ __volatile__( + "1: addcc %0, -4096, %0\n\t" + " bne 1b\n\t" + " sta %%g0, [%0] %2" + : "=&r" (end) + : "0" (end), "i" (ASI_HWFLUSHCONTEXT) + : "cc"); +} + +/* Must be called minimally with IRQs disabled. */ +static void sun4c_flush_segment_hw(unsigned long addr) +{ + if (sun4c_get_segmap(addr) != invalid_segment) { + unsigned long vac_size = SUN4C_VAC_SIZE; + + __asm__ __volatile__( + "1: addcc %0, -4096, %0\n\t" + " bne 1b\n\t" + " sta %%g0, [%2 + %0] %3" + : "=&r" (vac_size) + : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG) + : "cc"); + } +} + +/* File local boot time fixups. */ +BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long) +BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long) +BTFIXUPDEF_CALL(void, sun4c_flush_context, void) + +#define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr) +#define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr) +#define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)() + +/* Must be called minimally with interrupts disabled. */ +static void sun4c_flush_page_hw(unsigned long addr) +{ + addr &= PAGE_MASK; + if ((int)sun4c_get_pte(addr) < 0) + __asm__ __volatile__("sta %%g0, [%0] %1" + : : "r" (addr), "i" (ASI_HWFLUSHPAGE)); +} + +/* Don't inline the software version as it eats too many cache lines if expanded. */ +static void sun4c_flush_context_sw(void) +{ + unsigned long nbytes = SUN4C_VAC_SIZE; + unsigned long lsize = sun4c_vacinfo.linesize; + + __asm__ __volatile__( + "add %2, %2, %%g1\n\t" + "add %2, %%g1, %%g2\n\t" + "add %2, %%g2, %%g3\n\t" + "add %2, %%g3, %%g4\n\t" + "add %2, %%g4, %%g5\n\t" + "add %2, %%g5, %%o4\n\t" + "add %2, %%o4, %%o5\n" + "1:\n\t" + "subcc %0, %%o5, %0\n\t" + "sta %%g0, [%0] %3\n\t" + "sta %%g0, [%0 + %2] %3\n\t" + "sta %%g0, [%0 + %%g1] %3\n\t" + "sta %%g0, [%0 + %%g2] %3\n\t" + "sta %%g0, [%0 + %%g3] %3\n\t" + "sta %%g0, [%0 + %%g4] %3\n\t" + "sta %%g0, [%0 + %%g5] %3\n\t" + "bg 1b\n\t" + " sta %%g0, [%1 + %%o4] %3\n" + : "=&r" (nbytes) + : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX) + : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); +} + +/* Don't inline the software version as it eats too many cache lines if expanded. */ +static void sun4c_flush_segment_sw(unsigned long addr) +{ + if (sun4c_get_segmap(addr) != invalid_segment) { + unsigned long nbytes = SUN4C_VAC_SIZE; + unsigned long lsize = sun4c_vacinfo.linesize; + + __asm__ __volatile__( + "add %2, %2, %%g1\n\t" + "add %2, %%g1, %%g2\n\t" + "add %2, %%g2, %%g3\n\t" + "add %2, %%g3, %%g4\n\t" + "add %2, %%g4, %%g5\n\t" + "add %2, %%g5, %%o4\n\t" + "add %2, %%o4, %%o5\n" + "1:\n\t" + "subcc %1, %%o5, %1\n\t" + "sta %%g0, [%0] %6\n\t" + "sta %%g0, [%0 + %2] %6\n\t" + "sta %%g0, [%0 + %%g1] %6\n\t" + "sta %%g0, [%0 + %%g2] %6\n\t" + "sta %%g0, [%0 + %%g3] %6\n\t" + "sta %%g0, [%0 + %%g4] %6\n\t" + "sta %%g0, [%0 + %%g5] %6\n\t" + "sta %%g0, [%0 + %%o4] %6\n\t" + "bg 1b\n\t" + " add %0, %%o5, %0\n" + : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize) + : "0" (addr), "1" (nbytes), "2" (lsize), + "i" (ASI_FLUSHSEG) + : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); + } +} + +/* Don't inline the software version as it eats too many cache lines if expanded. */ +static void sun4c_flush_page_sw(unsigned long addr) +{ + addr &= PAGE_MASK; + if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) == + _SUN4C_PAGE_VALID) { + unsigned long left = PAGE_SIZE; + unsigned long lsize = sun4c_vacinfo.linesize; + + __asm__ __volatile__( + "add %2, %2, %%g1\n\t" + "add %2, %%g1, %%g2\n\t" + "add %2, %%g2, %%g3\n\t" + "add %2, %%g3, %%g4\n\t" + "add %2, %%g4, %%g5\n\t" + "add %2, %%g5, %%o4\n\t" + "add %2, %%o4, %%o5\n" + "1:\n\t" + "subcc %1, %%o5, %1\n\t" + "sta %%g0, [%0] %6\n\t" + "sta %%g0, [%0 + %2] %6\n\t" + "sta %%g0, [%0 + %%g1] %6\n\t" + "sta %%g0, [%0 + %%g2] %6\n\t" + "sta %%g0, [%0 + %%g3] %6\n\t" + "sta %%g0, [%0 + %%g4] %6\n\t" + "sta %%g0, [%0 + %%g5] %6\n\t" + "sta %%g0, [%0 + %%o4] %6\n\t" + "bg 1b\n\t" + " add %0, %%o5, %0\n" + : "=&r" (addr), "=&r" (left), "=&r" (lsize) + : "0" (addr), "1" (left), "2" (lsize), + "i" (ASI_FLUSHPG) + : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); + } +} + +/* The sun4c's do have an on chip store buffer. And the way you + * clear them out isn't so obvious. The only way I can think of + * to accomplish this is to read the current context register, + * store the same value there, then read an external hardware + * register. + */ +void sun4c_complete_all_stores(void) +{ + volatile int _unused; + + _unused = sun4c_get_context(); + sun4c_set_context(_unused); +#ifdef CONFIG_SUN_AUXIO + _unused = get_auxio(); +#endif +} + +/* Bootup utility functions. */ +static inline void sun4c_init_clean_segmap(unsigned char pseg) +{ + unsigned long vaddr; + + sun4c_put_segmap(0, pseg); + for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE) + sun4c_put_pte(vaddr, 0); + sun4c_put_segmap(0, invalid_segment); +} + +static inline void sun4c_init_clean_mmu(unsigned long kernel_end) +{ + unsigned long vaddr; + unsigned char savectx, ctx; + + savectx = sun4c_get_context(); + kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end); + for (ctx = 0; ctx < num_contexts; ctx++) { + sun4c_set_context(ctx); + for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE) + sun4c_put_segmap(vaddr, invalid_segment); + for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE) + sun4c_put_segmap(vaddr, invalid_segment); + for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE) + sun4c_put_segmap(vaddr, invalid_segment); + for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE) + sun4c_put_segmap(vaddr, invalid_segment); + } + sun4c_set_context(savectx); +} + +void __init sun4c_probe_vac(void) +{ + sun4c_disable_vac(); + + if (ARCH_SUN4) { + switch (idprom->id_machtype) { + + case (SM_SUN4|SM_4_110): + sun4c_vacinfo.type = VAC_NONE; + sun4c_vacinfo.num_bytes = 0; + sun4c_vacinfo.linesize = 0; + sun4c_vacinfo.do_hwflushes = 0; + prom_printf("No VAC. Get some bucks and buy a real computer."); + prom_halt(); + break; + + case (SM_SUN4|SM_4_260): + sun4c_vacinfo.type = VAC_WRITE_BACK; + sun4c_vacinfo.num_bytes = 128 * 1024; + sun4c_vacinfo.linesize = 16; + sun4c_vacinfo.do_hwflushes = 0; + break; + + case (SM_SUN4|SM_4_330): + sun4c_vacinfo.type = VAC_WRITE_THROUGH; + sun4c_vacinfo.num_bytes = 128 * 1024; + sun4c_vacinfo.linesize = 16; + sun4c_vacinfo.do_hwflushes = 0; + break; + + case (SM_SUN4|SM_4_470): + sun4c_vacinfo.type = VAC_WRITE_BACK; + sun4c_vacinfo.num_bytes = 128 * 1024; + sun4c_vacinfo.linesize = 32; + sun4c_vacinfo.do_hwflushes = 0; + break; + + default: + prom_printf("Cannot initialize VAC - weird sun4 model idprom->id_machtype = %d", idprom->id_machtype); + prom_halt(); + }; + } else { + sun4c_vacinfo.type = VAC_WRITE_THROUGH; + + if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || + (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { + /* PROM on SS1 lacks this info, to be super safe we + * hard code it here since this arch is cast in stone. + */ + sun4c_vacinfo.num_bytes = 65536; + sun4c_vacinfo.linesize = 16; + } else { + sun4c_vacinfo.num_bytes = + prom_getintdefault(prom_root_node, "vac-size", 65536); + sun4c_vacinfo.linesize = + prom_getintdefault(prom_root_node, "vac-linesize", 16); + } + sun4c_vacinfo.do_hwflushes = + prom_getintdefault(prom_root_node, "vac-hwflush", 0); + + if (sun4c_vacinfo.do_hwflushes == 0) + sun4c_vacinfo.do_hwflushes = + prom_getintdefault(prom_root_node, "vac_hwflush", 0); + + if (sun4c_vacinfo.num_bytes != 65536) { + prom_printf("WEIRD Sun4C VAC cache size, " + "tell sparclinux@vger.kernel.org"); + prom_halt(); + } + } + + sun4c_vacinfo.num_lines = + (sun4c_vacinfo.num_bytes / sun4c_vacinfo.linesize); + switch (sun4c_vacinfo.linesize) { + case 16: + sun4c_vacinfo.log2lsize = 4; + break; + case 32: + sun4c_vacinfo.log2lsize = 5; + break; + default: + prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n", + sun4c_vacinfo.linesize); + prom_halt(); + }; + + sun4c_flush_all(); + sun4c_enable_vac(); +} + +/* Patch instructions for the low level kernel fault handler. */ +extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff; +extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff; +extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff; +extern unsigned long num_context_patch1, num_context_patch1_16; +extern unsigned long num_context_patch2_16; +extern unsigned long vac_linesize_patch, vac_linesize_patch_32; +extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on; +extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on; + +#define PATCH_INSN(src, dst) do { \ + daddr = &(dst); \ + iaddr = &(src); \ + *daddr = *iaddr; \ + } while (0) + +static void __init patch_kernel_fault_handler(void) +{ + unsigned long *iaddr, *daddr; + + switch (num_segmaps) { + case 128: + /* Default, nothing to do. */ + break; + case 256: + PATCH_INSN(invalid_segment_patch1_ff, + invalid_segment_patch1); + PATCH_INSN(invalid_segment_patch2_ff, + invalid_segment_patch2); + break; + case 512: + PATCH_INSN(invalid_segment_patch1_1ff, + invalid_segment_patch1); + PATCH_INSN(invalid_segment_patch2_1ff, + invalid_segment_patch2); + break; + default: + prom_printf("Unhandled number of segmaps: %d\n", + num_segmaps); + prom_halt(); + }; + switch (num_contexts) { + case 8: + /* Default, nothing to do. */ + break; + case 16: + PATCH_INSN(num_context_patch1_16, + num_context_patch1); + break; + default: + prom_printf("Unhandled number of contexts: %d\n", + num_contexts); + prom_halt(); + }; + + if (sun4c_vacinfo.do_hwflushes != 0) { + PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1); + PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2); + } else { + switch (sun4c_vacinfo.linesize) { + case 16: + /* Default, nothing to do. */ + break; + case 32: + PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch); + break; + default: + prom_printf("Impossible VAC linesize %d, halting...\n", + sun4c_vacinfo.linesize); + prom_halt(); + }; + } +} + +static void __init sun4c_probe_mmu(void) +{ + if (ARCH_SUN4) { + switch (idprom->id_machtype) { + case (SM_SUN4|SM_4_110): + prom_printf("No support for 4100 yet\n"); + prom_halt(); + num_segmaps = 256; + num_contexts = 8; + break; + + case (SM_SUN4|SM_4_260): + /* should be 512 segmaps. when it get fixed */ + num_segmaps = 256; + num_contexts = 16; + break; + + case (SM_SUN4|SM_4_330): + num_segmaps = 256; + num_contexts = 16; + break; + + case (SM_SUN4|SM_4_470): + /* should be 1024 segmaps. when it get fixed */ + num_segmaps = 256; + num_contexts = 64; + break; + default: + prom_printf("Invalid SUN4 model\n"); + prom_halt(); + }; + } else { + if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || + (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { + /* Hardcode these just to be safe, PROM on SS1 does + * not have this info available in the root node. + */ + num_segmaps = 128; + num_contexts = 8; + } else { + num_segmaps = + prom_getintdefault(prom_root_node, "mmu-npmg", 128); + num_contexts = + prom_getintdefault(prom_root_node, "mmu-nctx", 0x8); + } + } + patch_kernel_fault_handler(); +} + +volatile unsigned long *sun4c_memerr_reg = NULL; + +void __init sun4c_probe_memerr_reg(void) +{ + int node; + struct linux_prom_registers regs[1]; + + if (ARCH_SUN4) { + sun4c_memerr_reg = ioremap(sun4_memreg_physaddr, PAGE_SIZE); + } else { + node = prom_getchild(prom_root_node); + node = prom_searchsiblings(prom_root_node, "memory-error"); + if (!node) + return; + if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0) + return; + /* hmm I think regs[0].which_io is zero here anyways */ + sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size); + } +} + +static inline void sun4c_init_ss2_cache_bug(void) +{ + extern unsigned long start; + + if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) || + (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) || + (idprom->id_machtype == (SM_SUN4 | SM_4_330)) || + (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) { + /* Whee.. */ + printk("SS2 cache bug detected, uncaching trap table page\n"); + sun4c_flush_page((unsigned int) &start); + sun4c_put_pte(((unsigned long) &start), + (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE)); + } +} + +/* Addr is always aligned on a page boundary for us already. */ +static int sun4c_map_dma_area(dma_addr_t *pba, unsigned long va, + unsigned long addr, int len) +{ + unsigned long page, end; + + *pba = addr; + + end = PAGE_ALIGN((addr + len)); + while (addr < end) { + page = va; + sun4c_flush_page(page); + page -= PAGE_OFFSET; + page >>= PAGE_SHIFT; + page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY | + _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV); + sun4c_put_pte(addr, page); + addr += PAGE_SIZE; + va += PAGE_SIZE; + } + + return 0; +} + +static struct page *sun4c_translate_dvma(unsigned long busa) +{ + /* Fortunately for us, bus_addr == uncached_virt in sun4c. */ + unsigned long pte = sun4c_get_pte(busa); + return pfn_to_page(pte & SUN4C_PFN_MASK); +} + +static void sun4c_unmap_dma_area(unsigned long busa, int len) +{ + /* Fortunately for us, bus_addr == uncached_virt in sun4c. */ + /* XXX Implement this */ +} + +/* TLB management. */ + +/* Don't change this struct without changing entry.S. This is used + * in the in-window kernel fault handler, and you don't want to mess + * with that. (See sun4c_fault in entry.S). + */ +struct sun4c_mmu_entry { + struct sun4c_mmu_entry *next; + struct sun4c_mmu_entry *prev; + unsigned long vaddr; + unsigned char pseg; + unsigned char locked; + + /* For user mappings only, and completely hidden from kernel + * TLB miss code. + */ + unsigned char ctx; + struct sun4c_mmu_entry *lru_next; + struct sun4c_mmu_entry *lru_prev; +}; + +static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS]; + +static void __init sun4c_init_mmu_entry_pool(void) +{ + int i; + + for (i=0; i < SUN4C_MAX_SEGMAPS; i++) { + mmu_entry_pool[i].pseg = i; + mmu_entry_pool[i].next = NULL; + mmu_entry_pool[i].prev = NULL; + mmu_entry_pool[i].vaddr = 0; + mmu_entry_pool[i].locked = 0; + mmu_entry_pool[i].ctx = 0; + mmu_entry_pool[i].lru_next = NULL; + mmu_entry_pool[i].lru_prev = NULL; + } + mmu_entry_pool[invalid_segment].locked = 1; +} + +static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on, + unsigned long bits_off) +{ + unsigned long start, end; + + end = vaddr + SUN4C_REAL_PGDIR_SIZE; + for (start = vaddr; start < end; start += PAGE_SIZE) + if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID) + sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) & + ~bits_off); +} + +static inline void sun4c_init_map_kernelprom(unsigned long kernel_end) +{ + unsigned long vaddr; + unsigned char pseg, ctx; +#ifdef CONFIG_SUN4 + /* sun4/110 and 260 have no kadb. */ + if ((idprom->id_machtype != (SM_SUN4 | SM_4_260)) && + (idprom->id_machtype != (SM_SUN4 | SM_4_110))) { +#endif + for (vaddr = KADB_DEBUGGER_BEGVM; + vaddr < LINUX_OPPROM_ENDVM; + vaddr += SUN4C_REAL_PGDIR_SIZE) { + pseg = sun4c_get_segmap(vaddr); + if (pseg != invalid_segment) { + mmu_entry_pool[pseg].locked = 1; + for (ctx = 0; ctx < num_contexts; ctx++) + prom_putsegment(ctx, vaddr, pseg); + fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0); + } + } +#ifdef CONFIG_SUN4 + } +#endif + for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) { + pseg = sun4c_get_segmap(vaddr); + mmu_entry_pool[pseg].locked = 1; + for (ctx = 0; ctx < num_contexts; ctx++) + prom_putsegment(ctx, vaddr, pseg); + fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE); + } +} + +static void __init sun4c_init_lock_area(unsigned long start, unsigned long end) +{ + int i, ctx; + + while (start < end) { + for (i = 0; i < invalid_segment; i++) + if (!mmu_entry_pool[i].locked) + break; + mmu_entry_pool[i].locked = 1; + sun4c_init_clean_segmap(i); + for (ctx = 0; ctx < num_contexts; ctx++) + prom_putsegment(ctx, start, mmu_entry_pool[i].pseg); + start += SUN4C_REAL_PGDIR_SIZE; + } +} + +/* Don't change this struct without changing entry.S. This is used + * in the in-window kernel fault handler, and you don't want to mess + * with that. (See sun4c_fault in entry.S). + */ +struct sun4c_mmu_ring { + struct sun4c_mmu_entry ringhd; + int num_entries; +}; + +static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */ +static struct sun4c_mmu_ring sun4c_ufree_ring; /* free user entries */ +static struct sun4c_mmu_ring sun4c_ulru_ring; /* LRU user entries */ +struct sun4c_mmu_ring sun4c_kernel_ring; /* used kernel entries */ +struct sun4c_mmu_ring sun4c_kfree_ring; /* free kernel entries */ + +static inline void sun4c_init_rings(void) +{ + int i; + + for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) { + sun4c_context_ring[i].ringhd.next = + sun4c_context_ring[i].ringhd.prev = + &sun4c_context_ring[i].ringhd; + sun4c_context_ring[i].num_entries = 0; + } + sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev = + &sun4c_ufree_ring.ringhd; + sun4c_ufree_ring.num_entries = 0; + sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev = + &sun4c_ulru_ring.ringhd; + sun4c_ulru_ring.num_entries = 0; + sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev = + &sun4c_kernel_ring.ringhd; + sun4c_kernel_ring.num_entries = 0; + sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev = + &sun4c_kfree_ring.ringhd; + sun4c_kfree_ring.num_entries = 0; +} + +static void add_ring(struct sun4c_mmu_ring *ring, + struct sun4c_mmu_entry *entry) +{ + struct sun4c_mmu_entry *head = &ring->ringhd; + + entry->prev = head; + (entry->next = head->next)->prev = entry; + head->next = entry; + ring->num_entries++; +} + +static __inline__ void add_lru(struct sun4c_mmu_entry *entry) +{ + struct sun4c_mmu_ring *ring = &sun4c_ulru_ring; + struct sun4c_mmu_entry *head = &ring->ringhd; + + entry->lru_next = head; + (entry->lru_prev = head->lru_prev)->lru_next = entry; + head->lru_prev = entry; +} + +static void add_ring_ordered(struct sun4c_mmu_ring *ring, + struct sun4c_mmu_entry *entry) +{ + struct sun4c_mmu_entry *head = &ring->ringhd; + unsigned long addr = entry->vaddr; + + while ((head->next != &ring->ringhd) && (head->next->vaddr < addr)) + head = head->next; + + entry->prev = head; + (entry->next = head->next)->prev = entry; + head->next = entry; + ring->num_entries++; + + add_lru(entry); +} + +static __inline__ void remove_ring(struct sun4c_mmu_ring *ring, + struct sun4c_mmu_entry *entry) +{ + struct sun4c_mmu_entry *next = entry->next; + + (next->prev = entry->prev)->next = next; + ring->num_entries--; +} + +static void remove_lru(struct sun4c_mmu_entry *entry) +{ + struct sun4c_mmu_entry *next = entry->lru_next; + + (next->lru_prev = entry->lru_prev)->lru_next = next; +} + +static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry) +{ + remove_ring(sun4c_context_ring+ctx, entry); + remove_lru(entry); + add_ring(&sun4c_ufree_ring, entry); +} + +static void free_kernel_entry(struct sun4c_mmu_entry *entry, + struct sun4c_mmu_ring *ring) +{ + remove_ring(ring, entry); + add_ring(&sun4c_kfree_ring, entry); +} + +static void __init sun4c_init_fill_kernel_ring(int howmany) +{ + int i; + + while (howmany) { + for (i = 0; i < invalid_segment; i++) + if (!mmu_entry_pool[i].locked) + break; + mmu_entry_pool[i].locked = 1; + sun4c_init_clean_segmap(i); + add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]); + howmany--; + } +} + +static void __init sun4c_init_fill_user_ring(void) +{ + int i; + + for (i = 0; i < invalid_segment; i++) { + if (mmu_entry_pool[i].locked) + continue; + sun4c_init_clean_segmap(i); + add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]); + } +} + +static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry) +{ + int savectx, ctx; + + savectx = sun4c_get_context(); + for (ctx = 0; ctx < num_contexts; ctx++) { + sun4c_set_context(ctx); + sun4c_put_segmap(kentry->vaddr, invalid_segment); + } + sun4c_set_context(savectx); +} + +static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry) +{ + int savectx, ctx; + + savectx = sun4c_get_context(); + for (ctx = 0; ctx < num_contexts; ctx++) { + sun4c_set_context(ctx); + sun4c_put_segmap(kentry->vaddr, kentry->pseg); + } + sun4c_set_context(savectx); +} + +#define sun4c_user_unmap(__entry) \ + sun4c_put_segmap((__entry)->vaddr, invalid_segment) + +static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx) +{ + struct sun4c_mmu_entry *head = &crp->ringhd; + unsigned long flags; + + local_irq_save(flags); + if (head->next != head) { + struct sun4c_mmu_entry *entry = head->next; + int savectx = sun4c_get_context(); + + flush_user_windows(); + sun4c_set_context(ctx); + sun4c_flush_context(); + do { + struct sun4c_mmu_entry *next = entry->next; + + sun4c_user_unmap(entry); + free_user_entry(ctx, entry); + + entry = next; + } while (entry != head); + sun4c_set_context(savectx); + } + local_irq_restore(flags); +} + +static int sun4c_user_taken_entries; /* This is how much we have. */ +static int max_user_taken_entries; /* This limits us and prevents deadlock. */ + +static struct sun4c_mmu_entry *sun4c_kernel_strategy(void) +{ + struct sun4c_mmu_entry *this_entry; + + /* If some are free, return first one. */ + if (sun4c_kfree_ring.num_entries) { + this_entry = sun4c_kfree_ring.ringhd.next; + return this_entry; + } + + /* Else free one up. */ + this_entry = sun4c_kernel_ring.ringhd.prev; + sun4c_flush_segment(this_entry->vaddr); + sun4c_kernel_unmap(this_entry); + free_kernel_entry(this_entry, &sun4c_kernel_ring); + this_entry = sun4c_kfree_ring.ringhd.next; + + return this_entry; +} + +/* Using this method to free up mmu entries eliminates a lot of + * potential races since we have a kernel that incurs tlb + * replacement faults. There may be performance penalties. + * + * NOTE: Must be called with interrupts disabled. + */ +static struct sun4c_mmu_entry *sun4c_user_strategy(void) +{ + struct sun4c_mmu_entry *entry; + unsigned char ctx; + int savectx; + + /* If some are free, return first one. */ + if (sun4c_ufree_ring.num_entries) { + entry = sun4c_ufree_ring.ringhd.next; + goto unlink_out; + } + + if (sun4c_user_taken_entries) { + entry = sun4c_kernel_strategy(); + sun4c_user_taken_entries--; + goto kunlink_out; + } + + /* Grab from the beginning of the LRU list. */ + entry = sun4c_ulru_ring.ringhd.lru_next; + ctx = entry->ctx; + + savectx = sun4c_get_context(); + flush_user_windows(); + sun4c_set_context(ctx); + sun4c_flush_segment(entry->vaddr); + sun4c_user_unmap(entry); + remove_ring(sun4c_context_ring + ctx, entry); + remove_lru(entry); + sun4c_set_context(savectx); + + return entry; + +unlink_out: + remove_ring(&sun4c_ufree_ring, entry); + return entry; +kunlink_out: + remove_ring(&sun4c_kfree_ring, entry); + return entry; +} + +/* NOTE: Must be called with interrupts disabled. */ +void sun4c_grow_kernel_ring(void) +{ + struct sun4c_mmu_entry *entry; + + /* Prevent deadlock condition. */ + if (sun4c_user_taken_entries >= max_user_taken_entries) + return; + + if (sun4c_ufree_ring.num_entries) { + entry = sun4c_ufree_ring.ringhd.next; + remove_ring(&sun4c_ufree_ring, entry); + add_ring(&sun4c_kfree_ring, entry); + sun4c_user_taken_entries++; + } +} + +/* 2 page buckets for task struct and kernel stack allocation. + * + * TASK_STACK_BEGIN + * bucket[0] + * bucket[1] + * [ ... ] + * bucket[NR_TASK_BUCKETS-1] + * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS) + * + * Each slot looks like: + * + * page 1 -- task struct + beginning of kernel stack + * page 2 -- rest of kernel stack + */ + +union task_union *sun4c_bucket[NR_TASK_BUCKETS]; + +static int sun4c_lowbucket_avail; + +#define BUCKET_EMPTY ((union task_union *) 0) +#define BUCKET_SHIFT (PAGE_SHIFT + 1) /* log2(sizeof(struct task_bucket)) */ +#define BUCKET_SIZE (1 << BUCKET_SHIFT) +#define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT)) +#define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR) +#define BUCKET_PTE(page) \ + ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL)) +#define BUCKET_PTE_PAGE(pte) \ + (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT)) + +static void get_locked_segment(unsigned long addr) +{ + struct sun4c_mmu_entry *stolen; + unsigned long flags; + + local_irq_save(flags); + addr &= SUN4C_REAL_PGDIR_MASK; + stolen = sun4c_user_strategy(); + max_user_taken_entries--; + stolen->vaddr = addr; + flush_user_windows(); + sun4c_kernel_map(stolen); + local_irq_restore(flags); +} + +static void free_locked_segment(unsigned long addr) +{ + struct sun4c_mmu_entry *entry; + unsigned long flags; + unsigned char pseg; + + local_irq_save(flags); + addr &= SUN4C_REAL_PGDIR_MASK; + pseg = sun4c_get_segmap(addr); + entry = &mmu_entry_pool[pseg]; + + flush_user_windows(); + sun4c_flush_segment(addr); + sun4c_kernel_unmap(entry); + add_ring(&sun4c_ufree_ring, entry); + max_user_taken_entries++; + local_irq_restore(flags); +} + +static inline void garbage_collect(int entry) +{ + int start, end; + + /* 32 buckets per segment... */ + entry &= ~31; + start = entry; + for (end = (start + 32); start < end; start++) + if (sun4c_bucket[start] != BUCKET_EMPTY) + return; + + /* Entire segment empty, release it. */ + free_locked_segment(BUCKET_ADDR(entry)); +} + +static struct thread_info *sun4c_alloc_thread_info(void) +{ + unsigned long addr, pages; + int entry; + + pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER); + if (!pages) + return NULL; + + for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++) + if (sun4c_bucket[entry] == BUCKET_EMPTY) + break; + if (entry == NR_TASK_BUCKETS) { + free_pages(pages, THREAD_INFO_ORDER); + return NULL; + } + if (entry >= sun4c_lowbucket_avail) + sun4c_lowbucket_avail = entry + 1; + + addr = BUCKET_ADDR(entry); + sun4c_bucket[entry] = (union task_union *) addr; + if(sun4c_get_segmap(addr) == invalid_segment) + get_locked_segment(addr); + + /* We are changing the virtual color of the page(s) + * so we must flush the cache to guarantee consistency. + */ + sun4c_flush_page(pages); +#ifndef CONFIG_SUN4 + sun4c_flush_page(pages + PAGE_SIZE); +#endif + + sun4c_put_pte(addr, BUCKET_PTE(pages)); +#ifndef CONFIG_SUN4 + sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE)); +#endif + +#ifdef CONFIG_DEBUG_STACK_USAGE + memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER); +#endif /* DEBUG_STACK_USAGE */ + + return (struct thread_info *) addr; +} + +static void sun4c_free_thread_info(struct thread_info *ti) +{ + unsigned long tiaddr = (unsigned long) ti; + unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr)); + int entry = BUCKET_NUM(tiaddr); + + /* We are deleting a mapping, so the flush here is mandatory. */ + sun4c_flush_page(tiaddr); +#ifndef CONFIG_SUN4 + sun4c_flush_page(tiaddr + PAGE_SIZE); +#endif + sun4c_put_pte(tiaddr, 0); +#ifndef CONFIG_SUN4 + sun4c_put_pte(tiaddr + PAGE_SIZE, 0); +#endif + sun4c_bucket[entry] = BUCKET_EMPTY; + if (entry < sun4c_lowbucket_avail) + sun4c_lowbucket_avail = entry; + + free_pages(pages, THREAD_INFO_ORDER); + garbage_collect(entry); +} + +static void __init sun4c_init_buckets(void) +{ + int entry; + + if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) { + extern void thread_info_size_is_bolixed_pete(void); + thread_info_size_is_bolixed_pete(); + } + + for (entry = 0; entry < NR_TASK_BUCKETS; entry++) + sun4c_bucket[entry] = BUCKET_EMPTY; + sun4c_lowbucket_avail = 0; +} + +static unsigned long sun4c_iobuffer_start; +static unsigned long sun4c_iobuffer_end; +static unsigned long sun4c_iobuffer_high; +static unsigned long *sun4c_iobuffer_map; +static int iobuffer_map_size; + +/* + * Alias our pages so they do not cause a trap. + * Also one page may be aliased into several I/O areas and we may + * finish these I/O separately. + */ +static char *sun4c_lockarea(char *vaddr, unsigned long size) +{ + unsigned long base, scan; + unsigned long npages; + unsigned long vpage; + unsigned long pte; + unsigned long apage; + unsigned long high; + unsigned long flags; + + npages = (((unsigned long)vaddr & ~PAGE_MASK) + + size + (PAGE_SIZE-1)) >> PAGE_SHIFT; + + scan = 0; + local_irq_save(flags); + for (;;) { + scan = find_next_zero_bit(sun4c_iobuffer_map, + iobuffer_map_size, scan); + if ((base = scan) + npages > iobuffer_map_size) goto abend; + for (;;) { + if (scan >= base + npages) goto found; + if (test_bit(scan, sun4c_iobuffer_map)) break; + scan++; + } + } + +found: + high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start; + high = SUN4C_REAL_PGDIR_ALIGN(high); + while (high > sun4c_iobuffer_high) { + get_locked_segment(sun4c_iobuffer_high); + sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE; + } + + vpage = ((unsigned long) vaddr) & PAGE_MASK; + for (scan = base; scan < base+npages; scan++) { + pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT); + pte |= pgprot_val(SUN4C_PAGE_KERNEL); + pte |= _SUN4C_PAGE_NOCACHE; + set_bit(scan, sun4c_iobuffer_map); + apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start; + + /* Flush original mapping so we see the right things later. */ + sun4c_flush_page(vpage); + + sun4c_put_pte(apage, pte); + vpage += PAGE_SIZE; + } + local_irq_restore(flags); + return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start + + (((unsigned long) vaddr) & ~PAGE_MASK)); + +abend: + local_irq_restore(flags); + printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size); + panic("Out of iobuffer table"); + return NULL; +} + +static void sun4c_unlockarea(char *vaddr, unsigned long size) +{ + unsigned long vpage, npages; + unsigned long flags; + int scan, high; + + vpage = (unsigned long)vaddr & PAGE_MASK; + npages = (((unsigned long)vaddr & ~PAGE_MASK) + + size + (PAGE_SIZE-1)) >> PAGE_SHIFT; + + local_irq_save(flags); + while (npages != 0) { + --npages; + + /* This mapping is marked non-cachable, no flush necessary. */ + sun4c_put_pte(vpage, 0); + clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT, + sun4c_iobuffer_map); + vpage += PAGE_SIZE; + } + + /* garbage collect */ + scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT; + while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5]) + scan -= 32; + scan += 32; + high = sun4c_iobuffer_start + (scan << PAGE_SHIFT); + high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE; + while (high < sun4c_iobuffer_high) { + sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE; + free_locked_segment(sun4c_iobuffer_high); + } + local_irq_restore(flags); +} + +/* Note the scsi code at init time passes to here buffers + * which sit on the kernel stack, those are already locked + * by implication and fool the page locking code above + * if passed to by mistake. + */ +static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus) +{ + unsigned long page; + + page = ((unsigned long)bufptr) & PAGE_MASK; + if (!virt_addr_valid(page)) { + sun4c_flush_page(page); + return (__u32)bufptr; /* already locked */ + } + return (__u32)sun4c_lockarea(bufptr, len); +} + +static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) +{ + while (sz != 0) { + --sz; + sg[sz].dvma_address = (__u32)sun4c_lockarea(page_address(sg[sz].page) + sg[sz].offset, sg[sz].length); + sg[sz].dvma_length = sg[sz].length; + } +} + +static void sun4c_release_scsi_one(__u32 bufptr, unsigned long len, struct sbus_bus *sbus) +{ + if (bufptr < sun4c_iobuffer_start) + return; /* On kernel stack or similar, see above */ + sun4c_unlockarea((char *)bufptr, len); +} + +static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) +{ + while (sz != 0) { + --sz; + sun4c_unlockarea((char *)sg[sz].dvma_address, sg[sz].length); + } +} + +#define TASK_ENTRY_SIZE BUCKET_SIZE /* see above */ +#define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1)) + +struct vm_area_struct sun4c_kstack_vma; + +static void __init sun4c_init_lock_areas(void) +{ + unsigned long sun4c_taskstack_start; + unsigned long sun4c_taskstack_end; + int bitmap_size; + + sun4c_init_buckets(); + sun4c_taskstack_start = SUN4C_LOCK_VADDR; + sun4c_taskstack_end = (sun4c_taskstack_start + + (TASK_ENTRY_SIZE * NR_TASK_BUCKETS)); + if (sun4c_taskstack_end >= SUN4C_LOCK_END) { + prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n"); + prom_halt(); + } + + sun4c_iobuffer_start = sun4c_iobuffer_high = + SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end); + sun4c_iobuffer_end = SUN4C_LOCK_END; + bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT; + bitmap_size = (bitmap_size + 7) >> 3; + bitmap_size = LONG_ALIGN(bitmap_size); + iobuffer_map_size = bitmap_size << 3; + sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL); + memset((void *) sun4c_iobuffer_map, 0, bitmap_size); + + sun4c_kstack_vma.vm_mm = &init_mm; + sun4c_kstack_vma.vm_start = sun4c_taskstack_start; + sun4c_kstack_vma.vm_end = sun4c_taskstack_end; + sun4c_kstack_vma.vm_page_prot = PAGE_SHARED; + sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC; + insert_vm_struct(&init_mm, &sun4c_kstack_vma); +} + +/* Cache flushing on the sun4c. */ +static void sun4c_flush_cache_all(void) +{ + unsigned long begin, end; + + flush_user_windows(); + begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE); + end = (begin + SUN4C_VAC_SIZE); + + if (sun4c_vacinfo.linesize == 32) { + while (begin < end) { + __asm__ __volatile__( + "ld [%0 + 0x00], %%g0\n\t" + "ld [%0 + 0x20], %%g0\n\t" + "ld [%0 + 0x40], %%g0\n\t" + "ld [%0 + 0x60], %%g0\n\t" + "ld [%0 + 0x80], %%g0\n\t" + "ld [%0 + 0xa0], %%g0\n\t" + "ld [%0 + 0xc0], %%g0\n\t" + "ld [%0 + 0xe0], %%g0\n\t" + "ld [%0 + 0x100], %%g0\n\t" + "ld [%0 + 0x120], %%g0\n\t" + "ld [%0 + 0x140], %%g0\n\t" + "ld [%0 + 0x160], %%g0\n\t" + "ld [%0 + 0x180], %%g0\n\t" + "ld [%0 + 0x1a0], %%g0\n\t" + "ld [%0 + 0x1c0], %%g0\n\t" + "ld [%0 + 0x1e0], %%g0\n" + : : "r" (begin)); + begin += 512; + } + } else { + while (begin < end) { + __asm__ __volatile__( + "ld [%0 + 0x00], %%g0\n\t" + "ld [%0 + 0x10], %%g0\n\t" + "ld [%0 + 0x20], %%g0\n\t" + "ld [%0 + 0x30], %%g0\n\t" + "ld [%0 + 0x40], %%g0\n\t" + "ld [%0 + 0x50], %%g0\n\t" + "ld [%0 + 0x60], %%g0\n\t" + "ld [%0 + 0x70], %%g0\n\t" + "ld [%0 + 0x80], %%g0\n\t" + "ld [%0 + 0x90], %%g0\n\t" + "ld [%0 + 0xa0], %%g0\n\t" + "ld [%0 + 0xb0], %%g0\n\t" + "ld [%0 + 0xc0], %%g0\n\t" + "ld [%0 + 0xd0], %%g0\n\t" + "ld [%0 + 0xe0], %%g0\n\t" + "ld [%0 + 0xf0], %%g0\n" + : : "r" (begin)); + begin += 256; + } + } +} + +static void sun4c_flush_cache_mm(struct mm_struct *mm) +{ + int new_ctx = mm->context; + + if (new_ctx != NO_CONTEXT) { + flush_user_windows(); + + if (sun4c_context_ring[new_ctx].num_entries) { + struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; + unsigned long flags; + + local_irq_save(flags); + if (head->next != head) { + struct sun4c_mmu_entry *entry = head->next; + int savectx = sun4c_get_context(); + + sun4c_set_context(new_ctx); + sun4c_flush_context(); + do { + struct sun4c_mmu_entry *next = entry->next; + + sun4c_user_unmap(entry); + free_user_entry(new_ctx, entry); + + entry = next; + } while (entry != head); + sun4c_set_context(savectx); + } + local_irq_restore(flags); + } + } +} + +static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) +{ + struct mm_struct *mm = vma->vm_mm; + int new_ctx = mm->context; + + if (new_ctx != NO_CONTEXT) { + struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; + struct sun4c_mmu_entry *entry; + unsigned long flags; + + flush_user_windows(); + + local_irq_save(flags); + /* All user segmap chains are ordered on entry->vaddr. */ + for (entry = head->next; + (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start); + entry = entry->next) + ; + + /* Tracing various job mixtures showed that this conditional + * only passes ~35% of the time for most worse case situations, + * therefore we avoid all of this gross overhead ~65% of the time. + */ + if ((entry != head) && (entry->vaddr < end)) { + int octx = sun4c_get_context(); + sun4c_set_context(new_ctx); + + /* At this point, always, (start >= entry->vaddr) and + * (entry->vaddr < end), once the latter condition + * ceases to hold, or we hit the end of the list, we + * exit the loop. The ordering of all user allocated + * segmaps makes this all work out so beautifully. + */ + do { + struct sun4c_mmu_entry *next = entry->next; + unsigned long realend; + + /* "realstart" is always >= entry->vaddr */ + realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE; + if (end < realend) + realend = end; + if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) { + unsigned long page = entry->vaddr; + while (page < realend) { + sun4c_flush_page(page); + page += PAGE_SIZE; + } + } else { + sun4c_flush_segment(entry->vaddr); + sun4c_user_unmap(entry); + free_user_entry(new_ctx, entry); + } + entry = next; + } while ((entry != head) && (entry->vaddr < end)); + sun4c_set_context(octx); + } + local_irq_restore(flags); + } +} + +static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page) +{ + struct mm_struct *mm = vma->vm_mm; + int new_ctx = mm->context; + + /* Sun4c has no separate I/D caches so cannot optimize for non + * text page flushes. + */ + if (new_ctx != NO_CONTEXT) { + int octx = sun4c_get_context(); + unsigned long flags; + + flush_user_windows(); + local_irq_save(flags); + sun4c_set_context(new_ctx); + sun4c_flush_page(page); + sun4c_set_context(octx); + local_irq_restore(flags); + } +} + +static void sun4c_flush_page_to_ram(unsigned long page) +{ + unsigned long flags; + + local_irq_save(flags); + sun4c_flush_page(page); + local_irq_restore(flags); +} + +/* Sun4c cache is unified, both instructions and data live there, so + * no need to flush the on-stack instructions for new signal handlers. + */ +static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) +{ +} + +/* TLB flushing on the sun4c. These routines count on the cache + * flushing code to flush the user register windows so that we need + * not do so when we get here. + */ + +static void sun4c_flush_tlb_all(void) +{ + struct sun4c_mmu_entry *this_entry, *next_entry; + unsigned long flags; + int savectx, ctx; + + local_irq_save(flags); + this_entry = sun4c_kernel_ring.ringhd.next; + savectx = sun4c_get_context(); + flush_user_windows(); + while (sun4c_kernel_ring.num_entries) { + next_entry = this_entry->next; + sun4c_flush_segment(this_entry->vaddr); + for (ctx = 0; ctx < num_contexts; ctx++) { + sun4c_set_context(ctx); + sun4c_put_segmap(this_entry->vaddr, invalid_segment); + } + free_kernel_entry(this_entry, &sun4c_kernel_ring); + this_entry = next_entry; + } + sun4c_set_context(savectx); + local_irq_restore(flags); +} + +static void sun4c_flush_tlb_mm(struct mm_struct *mm) +{ + int new_ctx = mm->context; + + if (new_ctx != NO_CONTEXT) { + struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; + unsigned long flags; + + local_irq_save(flags); + if (head->next != head) { + struct sun4c_mmu_entry *entry = head->next; + int savectx = sun4c_get_context(); + + sun4c_set_context(new_ctx); + sun4c_flush_context(); + do { + struct sun4c_mmu_entry *next = entry->next; + + sun4c_user_unmap(entry); + free_user_entry(new_ctx, entry); + + entry = next; + } while (entry != head); + sun4c_set_context(savectx); + } + local_irq_restore(flags); + } +} + +static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) +{ + struct mm_struct *mm = vma->vm_mm; + int new_ctx = mm->context; + + if (new_ctx != NO_CONTEXT) { + struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; + struct sun4c_mmu_entry *entry; + unsigned long flags; + + local_irq_save(flags); + /* See commentary in sun4c_flush_cache_range(). */ + for (entry = head->next; + (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start); + entry = entry->next) + ; + + if ((entry != head) && (entry->vaddr < end)) { + int octx = sun4c_get_context(); + + sun4c_set_context(new_ctx); + do { + struct sun4c_mmu_entry *next = entry->next; + + sun4c_flush_segment(entry->vaddr); + sun4c_user_unmap(entry); + free_user_entry(new_ctx, entry); + + entry = next; + } while ((entry != head) && (entry->vaddr < end)); + sun4c_set_context(octx); + } + local_irq_restore(flags); + } +} + +static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) +{ + struct mm_struct *mm = vma->vm_mm; + int new_ctx = mm->context; + + if (new_ctx != NO_CONTEXT) { + int savectx = sun4c_get_context(); + unsigned long flags; + + local_irq_save(flags); + sun4c_set_context(new_ctx); + page &= PAGE_MASK; + sun4c_flush_page(page); + sun4c_put_pte(page, 0); + sun4c_set_context(savectx); + local_irq_restore(flags); + } +} + +static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr) +{ + unsigned long page_entry; + + page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK); + page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT)); + sun4c_put_pte(virt_addr, page_entry); +} + +static void sun4c_mapiorange(unsigned int bus, unsigned long xpa, + unsigned long xva, unsigned int len) +{ + while (len != 0) { + len -= PAGE_SIZE; + sun4c_mapioaddr(xpa, xva); + xva += PAGE_SIZE; + xpa += PAGE_SIZE; + } +} + +static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len) +{ + while (len != 0) { + len -= PAGE_SIZE; + sun4c_put_pte(virt_addr, 0); + virt_addr += PAGE_SIZE; + } +} + +static void sun4c_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; + 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; + sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number], + ctxp->ctx_number); +} + +/* Switch the current MM context. */ +static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu) +{ + struct ctx_list *ctx; + int dirty = 0; + + if (mm->context == NO_CONTEXT) { + dirty = 1; + sun4c_alloc_context(old_mm, mm); + } else { + /* Update the LRU ring of contexts. */ + ctx = ctx_list_pool + mm->context; + remove_from_ctx_list(ctx); + add_to_used_ctxlist(ctx); + } + if (dirty || old_mm != mm) + sun4c_set_context(mm->context); +} + +static void sun4c_destroy_context(struct mm_struct *mm) +{ + struct ctx_list *ctx_old; + + if (mm->context != NO_CONTEXT) { + sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context); + ctx_old = ctx_list_pool + mm->context; + remove_from_ctx_list(ctx_old); + add_to_free_ctxlist(ctx_old); + mm->context = NO_CONTEXT; + } +} + +static void sun4c_mmu_info(struct seq_file *m) +{ + int used_user_entries, i; + + used_user_entries = 0; + for (i = 0; i < num_contexts; i++) + used_user_entries += sun4c_context_ring[i].num_entries; + + seq_printf(m, + "vacsize\t\t: %d bytes\n" + "vachwflush\t: %s\n" + "vaclinesize\t: %d bytes\n" + "mmuctxs\t\t: %d\n" + "mmupsegs\t: %d\n" + "kernelpsegs\t: %d\n" + "kfreepsegs\t: %d\n" + "usedpsegs\t: %d\n" + "ufreepsegs\t: %d\n" + "user_taken\t: %d\n" + "max_taken\t: %d\n", + sun4c_vacinfo.num_bytes, + (sun4c_vacinfo.do_hwflushes ? "yes" : "no"), + sun4c_vacinfo.linesize, + num_contexts, + (invalid_segment + 1), + sun4c_kernel_ring.num_entries, + sun4c_kfree_ring.num_entries, + used_user_entries, + sun4c_ufree_ring.num_entries, + sun4c_user_taken_entries, + max_user_taken_entries); +} + +/* Nothing below here should touch the mmu hardware nor the mmu_entry + * data structures. + */ + +/* First the functions which the mid-level code uses to directly + * manipulate the software page tables. Some defines since we are + * emulating the i386 page directory layout. + */ +#define PGD_PRESENT 0x001 +#define PGD_RW 0x002 +#define PGD_USER 0x004 +#define PGD_ACCESSED 0x020 +#define PGD_DIRTY 0x040 +#define PGD_TABLE (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY) + +static void sun4c_set_pte(pte_t *ptep, pte_t pte) +{ + *ptep = pte; +} + +static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp) +{ +} + +static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep) +{ + pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep; +} + +static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep) +{ + if (page_address(ptep) == NULL) BUG(); /* No highmem on sun4c */ + pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep); +} + +static int sun4c_pte_present(pte_t pte) +{ + return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0); +} +static void sun4c_pte_clear(pte_t *ptep) { *ptep = __pte(0); } + +static int sun4c_pte_read(pte_t pte) +{ + return (pte_val(pte) & _SUN4C_PAGE_READ); +} + +static int sun4c_pmd_bad(pmd_t pmd) +{ + return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) || + (!virt_addr_valid(pmd_val(pmd)))); +} + +static int sun4c_pmd_present(pmd_t pmd) +{ + return ((pmd_val(pmd) & PGD_PRESENT) != 0); +} + +#if 0 /* if PMD takes one word */ +static void sun4c_pmd_clear(pmd_t *pmdp) { *pmdp = __pmd(0); } +#else /* if pmd_t is a longish aggregate */ +static void sun4c_pmd_clear(pmd_t *pmdp) { + memset((void *)pmdp, 0, sizeof(pmd_t)); +} +#endif + +static int sun4c_pgd_none(pgd_t pgd) { return 0; } +static int sun4c_pgd_bad(pgd_t pgd) { return 0; } +static int sun4c_pgd_present(pgd_t pgd) { return 1; } +static void sun4c_pgd_clear(pgd_t * pgdp) { } + +/* + * The following only work if pte_present() is true. + * Undefined behaviour if not.. + */ +static pte_t sun4c_pte_mkwrite(pte_t pte) +{ + pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE); + if (pte_val(pte) & _SUN4C_PAGE_MODIFIED) + pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE); + return pte; +} + +static pte_t sun4c_pte_mkdirty(pte_t pte) +{ + pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED); + if (pte_val(pte) & _SUN4C_PAGE_WRITE) + pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE); + return pte; +} + +static pte_t sun4c_pte_mkyoung(pte_t pte) +{ + pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED); + if (pte_val(pte) & _SUN4C_PAGE_READ) + pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ); + return pte; +} + +/* + * 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 sun4c_mk_pte(struct page *page, pgprot_t pgprot) +{ + return __pte(page_to_pfn(page) | pgprot_val(pgprot)); +} + +static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot) +{ + return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot)); +} + +static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space) +{ + return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot)); +} + +static unsigned long sun4c_pte_pfn(pte_t pte) +{ + return pte_val(pte) & SUN4C_PFN_MASK; +} + +static pte_t sun4c_pgoff_to_pte(unsigned long pgoff) +{ + return __pte(pgoff | _SUN4C_PAGE_FILE); +} + +static unsigned long sun4c_pte_to_pgoff(pte_t pte) +{ + return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1); +} + + +static __inline__ unsigned long sun4c_pmd_page_v(pmd_t pmd) +{ + return (pmd_val(pmd) & PAGE_MASK); +} + +static struct page *sun4c_pmd_page(pmd_t pmd) +{ + return virt_to_page(sun4c_pmd_page_v(pmd)); +} + +static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; } + +/* to find an entry in a page-table-directory */ +static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address) +{ + return mm->pgd + (address >> SUN4C_PGDIR_SHIFT); +} + +/* Find an entry in the second-level page table.. */ +static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address) +{ + return (pmd_t *) dir; +} + +/* Find an entry in the third-level page table.. */ +pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address) +{ + return (pte_t *) sun4c_pmd_page_v(*dir) + + ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1)); +} + +static unsigned long sun4c_swp_type(swp_entry_t entry) +{ + return (entry.val & SUN4C_SWP_TYPE_MASK); +} + +static unsigned long sun4c_swp_offset(swp_entry_t entry) +{ + return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK; +} + +static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset) +{ + return (swp_entry_t) { + (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT + | (type & SUN4C_SWP_TYPE_MASK) }; +} + +static void sun4c_free_pte_slow(pte_t *pte) +{ + free_page((unsigned long)pte); +} + +static void sun4c_free_pgd_slow(pgd_t *pgd) +{ + free_page((unsigned long)pgd); +} + +static pgd_t *sun4c_get_pgd_fast(void) +{ + unsigned long *ret; + + if ((ret = pgd_quicklist) != NULL) { + pgd_quicklist = (unsigned long *)(*ret); + ret[0] = ret[1]; + pgtable_cache_size--; + } else { + pgd_t *init; + + ret = (unsigned long *)__get_free_page(GFP_KERNEL); + memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t)); + init = sun4c_pgd_offset(&init_mm, 0); + memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, + (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); + } + return (pgd_t *)ret; +} + +static void sun4c_free_pgd_fast(pgd_t *pgd) +{ + *(unsigned long *)pgd = (unsigned long) pgd_quicklist; + pgd_quicklist = (unsigned long *) pgd; + pgtable_cache_size++; +} + + +static __inline__ pte_t * +sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address) +{ + unsigned long *ret; + + if ((ret = (unsigned long *)pte_quicklist) != NULL) { + pte_quicklist = (unsigned long *)(*ret); + ret[0] = ret[1]; + pgtable_cache_size--; + } + return (pte_t *)ret; +} + +static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) +{ + pte_t *pte; + + if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL) + return pte; + + pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT); + if (pte) + memset(pte, 0, PAGE_SIZE); + return pte; +} + +static struct page *sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address) +{ + pte_t *pte = sun4c_pte_alloc_one_kernel(mm, address); + if (pte == NULL) + return NULL; + return virt_to_page(pte); +} + +static __inline__ void sun4c_free_pte_fast(pte_t *pte) +{ + *(unsigned long *)pte = (unsigned long) pte_quicklist; + pte_quicklist = (unsigned long *) pte; + pgtable_cache_size++; +} + +static void sun4c_pte_free(struct page *pte) +{ + sun4c_free_pte_fast(page_address(pte)); +} + +/* + * allocating and freeing a pmd is trivial: the 1-entry pmd is + * inside the pgd, so has no extra memory associated with it. + */ +static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address) +{ + BUG(); + return NULL; +} + +static void sun4c_free_pmd_fast(pmd_t * pmd) { } + +static void sun4c_check_pgt_cache(int low, int high) +{ + if (pgtable_cache_size > high) { + do { + if (pgd_quicklist) + sun4c_free_pgd_slow(sun4c_get_pgd_fast()); + if (pte_quicklist) + sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0)); + } while (pgtable_cache_size > low); + } +} + +/* An experiment, turn off by default for now... -DaveM */ +#define SUN4C_PRELOAD_PSEG + +void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte) +{ + unsigned long flags; + int pseg; + + local_irq_save(flags); + address &= PAGE_MASK; + if ((pseg = sun4c_get_segmap(address)) == invalid_segment) { + struct sun4c_mmu_entry *entry = sun4c_user_strategy(); + struct mm_struct *mm = vma->vm_mm; + unsigned long start, end; + + entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK); + entry->ctx = mm->context; + add_ring_ordered(sun4c_context_ring + mm->context, entry); + sun4c_put_segmap(entry->vaddr, entry->pseg); + end = start + SUN4C_REAL_PGDIR_SIZE; + while (start < end) { +#ifdef SUN4C_PRELOAD_PSEG + pgd_t *pgdp = sun4c_pgd_offset(mm, start); + pte_t *ptep; + + if (!pgdp) + goto no_mapping; + ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start); + if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT)) + goto no_mapping; + sun4c_put_pte(start, pte_val(*ptep)); + goto next; + + no_mapping: +#endif + sun4c_put_pte(start, 0); +#ifdef SUN4C_PRELOAD_PSEG + next: +#endif + start += PAGE_SIZE; + } +#ifndef SUN4C_PRELOAD_PSEG + sun4c_put_pte(address, pte_val(pte)); +#endif + local_irq_restore(flags); + return; + } else { + struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg]; + + remove_lru(entry); + add_lru(entry); + } + + sun4c_put_pte(address, pte_val(pte)); + local_irq_restore(flags); +} + +extern void sparc_context_init(int); +extern unsigned long end; +extern unsigned long bootmem_init(unsigned long *pages_avail); +extern unsigned long last_valid_pfn; + +void __init sun4c_paging_init(void) +{ + int i, cnt; + unsigned long kernel_end, vaddr; + extern struct resource sparc_iomap; + unsigned long end_pfn, pages_avail; + + kernel_end = (unsigned long) &end; + kernel_end += (SUN4C_REAL_PGDIR_SIZE * 4); + kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end); + + pages_avail = 0; + last_valid_pfn = bootmem_init(&pages_avail); + end_pfn = last_valid_pfn; + + sun4c_probe_mmu(); + invalid_segment = (num_segmaps - 1); + sun4c_init_mmu_entry_pool(); + sun4c_init_rings(); + sun4c_init_map_kernelprom(kernel_end); + sun4c_init_clean_mmu(kernel_end); + sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS); + sun4c_init_lock_area(sparc_iomap.start, IOBASE_END); + sun4c_init_lock_area(DVMA_VADDR, DVMA_END); + sun4c_init_lock_areas(); + sun4c_init_fill_user_ring(); + + sun4c_set_context(0); + memset(swapper_pg_dir, 0, PAGE_SIZE); + memset(pg0, 0, PAGE_SIZE); + memset(pg1, 0, PAGE_SIZE); + memset(pg2, 0, PAGE_SIZE); + memset(pg3, 0, PAGE_SIZE); + + /* Save work later. */ + vaddr = VMALLOC_START; + swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0); + vaddr += SUN4C_PGDIR_SIZE; + swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1); + vaddr += SUN4C_PGDIR_SIZE; + swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2); + vaddr += SUN4C_PGDIR_SIZE; + swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3); + sun4c_init_ss2_cache_bug(); + sparc_context_init(num_contexts); + + { + 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); + } + + cnt = 0; + for (i = 0; i < num_segmaps; i++) + if (mmu_entry_pool[i].locked) + cnt++; + + max_user_taken_entries = num_segmaps - cnt - 40 - 1; + + printk("SUN4C: %d mmu entries for the kernel\n", cnt); +} + +/* Load up routines and constants for sun4c mmu */ +void __init ld_mmu_sun4c(void) +{ + extern void ___xchg32_sun4c(void); + + printk("Loading sun4c MMU routines\n"); + + /* First the constants */ + BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT); + BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE); + BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK); + + BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD); + BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD); + BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE); + + BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE)); + BTFIXUPSET_INT(page_shared, pgprot_val(SUN4C_PAGE_SHARED)); + BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY)); + BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY)); + BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL)); + page_kernel = pgprot_val(SUN4C_PAGE_KERNEL); + pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE | + _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE; + + /* Functions */ + BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM); + + if (sun4c_vacinfo.do_hwflushes) { + BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM); + } else { + BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM); + } + + BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP); + + BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0); + + /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */ + /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */ /* Defaults to zero? */ + + BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM); +#if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */ + BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1)); +#else + BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM); +#endif + BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0); + BTFIXUPSET_CALL(pte_read, sun4c_pte_read, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0); + + BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0)); + BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0)); + BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1)); + BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP); + + BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM); + + BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK); + BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP); + BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0); + BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM); + + BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE); + BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED); + BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED); + BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE); + BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE); + BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE); + BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ); + BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(mmu_translate_dvma, sun4c_translate_dvma, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM); + BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM); + + BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM); + + /* These should _never_ get called with two level tables. */ + BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP); + BTFIXUPSET_CALL(pgd_page, sun4c_pgd_page, BTFIXUPCALL_RETO0); +} |
