1 files changed, 597 insertions, 0 deletions

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
new file mode 100644
index 0000000..65cf839
--- /dev/null
+++ b/arch/ia64/mm/init.c
@@ -0,0 +1,597 @@
+/*
+ * Initialize MMU support.
+ *
+ * Copyright (C) 1998-2003 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <linux/bootmem.h>
+#include <linux/efi.h>
+#include <linux/elf.h>
+#include <linux/mm.h>
+#include <linux/mmzone.h>
+#include <linux/module.h>
+#include <linux/personality.h>
+#include <linux/reboot.h>
+#include <linux/slab.h>
+#include <linux/swap.h>
+#include <linux/proc_fs.h>
+#include <linux/bitops.h>
+
+#include <asm/a.out.h>
+#include <asm/dma.h>
+#include <asm/ia32.h>
+#include <asm/io.h>
+#include <asm/machvec.h>
+#include <asm/numa.h>
+#include <asm/patch.h>
+#include <asm/pgalloc.h>
+#include <asm/sal.h>
+#include <asm/sections.h>
+#include <asm/system.h>
+#include <asm/tlb.h>
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+#include <asm/mca.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+extern void ia64_tlb_init (void);
+
+unsigned long MAX_DMA_ADDRESS = PAGE_OFFSET + 0x100000000UL;
+
+#ifdef CONFIG_VIRTUAL_MEM_MAP
+unsigned long vmalloc_end = VMALLOC_END_INIT;
+EXPORT_SYMBOL(vmalloc_end);
+struct page *vmem_map;
+EXPORT_SYMBOL(vmem_map);
+#endif
+
+static int pgt_cache_water[2] = { 25, 50 };
+
+struct page *zero_page_memmap_ptr;		/* map entry for zero page */
+EXPORT_SYMBOL(zero_page_memmap_ptr);
+
+void
+check_pgt_cache (void)
+{
+	int low, high;
+
+	low = pgt_cache_water[0];
+	high = pgt_cache_water[1];
+
+	preempt_disable();
+	if (pgtable_cache_size > (u64) high) {
+		do {
+			if (pgd_quicklist)
+				free_page((unsigned long)pgd_alloc_one_fast(NULL));
+			if (pmd_quicklist)
+				free_page((unsigned long)pmd_alloc_one_fast(NULL, 0));
+		} while (pgtable_cache_size > (u64) low);
+	}
+	preempt_enable();
+}
+
+void
+lazy_mmu_prot_update (pte_t pte)
+{
+	unsigned long addr;
+	struct page *page;
+
+	if (!pte_exec(pte))
+		return;				/* not an executable page... */
+
+	page = pte_page(pte);
+	addr = (unsigned long) page_address(page);
+
+	if (test_bit(PG_arch_1, &page->flags))
+		return;				/* i-cache is already coherent with d-cache */
+
+	flush_icache_range(addr, addr + PAGE_SIZE);
+	set_bit(PG_arch_1, &page->flags);	/* mark page as clean */
+}
+
+inline void
+ia64_set_rbs_bot (void)
+{
+	unsigned long stack_size = current->signal->rlim[RLIMIT_STACK].rlim_max & -16;
+
+	if (stack_size > MAX_USER_STACK_SIZE)
+		stack_size = MAX_USER_STACK_SIZE;
+	current->thread.rbs_bot = STACK_TOP - stack_size;
+}
+
+/*
+ * This performs some platform-dependent address space initialization.
+ * On IA-64, we want to setup the VM area for the register backing
+ * store (which grows upwards) and install the gateway page which is
+ * used for signal trampolines, etc.
+ */
+void
+ia64_init_addr_space (void)
+{
+	struct vm_area_struct *vma;
+
+	ia64_set_rbs_bot();
+
+	/*
+	 * If we're out of memory and kmem_cache_alloc() returns NULL, we simply ignore
+	 * the problem.  When the process attempts to write to the register backing store
+	 * for the first time, it will get a SEGFAULT in this case.
+	 */
+	vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
+	if (vma) {
+		memset(vma, 0, sizeof(*vma));
+		vma->vm_mm = current->mm;
+		vma->vm_start = current->thread.rbs_bot & PAGE_MASK;
+		vma->vm_end = vma->vm_start + PAGE_SIZE;
+		vma->vm_page_prot = protection_map[VM_DATA_DEFAULT_FLAGS & 0x7];
+		vma->vm_flags = VM_DATA_DEFAULT_FLAGS | VM_GROWSUP;
+		down_write(&current->mm->mmap_sem);
+		if (insert_vm_struct(current->mm, vma)) {
+			up_write(&current->mm->mmap_sem);
+			kmem_cache_free(vm_area_cachep, vma);
+			return;
+		}
+		up_write(&current->mm->mmap_sem);
+	}
+
+	/* map NaT-page at address zero to speed up speculative dereferencing of NULL: */
+	if (!(current->personality & MMAP_PAGE_ZERO)) {
+		vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
+		if (vma) {
+			memset(vma, 0, sizeof(*vma));
+			vma->vm_mm = current->mm;
+			vma->vm_end = PAGE_SIZE;
+			vma->vm_page_prot = __pgprot(pgprot_val(PAGE_READONLY) | _PAGE_MA_NAT);
+			vma->vm_flags = VM_READ | VM_MAYREAD | VM_IO | VM_RESERVED;
+			down_write(&current->mm->mmap_sem);
+			if (insert_vm_struct(current->mm, vma)) {
+				up_write(&current->mm->mmap_sem);
+				kmem_cache_free(vm_area_cachep, vma);
+				return;
+			}
+			up_write(&current->mm->mmap_sem);
+		}
+	}
+}
+
+void
+free_initmem (void)
+{
+	unsigned long addr, eaddr;
+
+	addr = (unsigned long) ia64_imva(__init_begin);
+	eaddr = (unsigned long) ia64_imva(__init_end);
+	while (addr < eaddr) {
+		ClearPageReserved(virt_to_page(addr));
+		set_page_count(virt_to_page(addr), 1);
+		free_page(addr);
+		++totalram_pages;
+		addr += PAGE_SIZE;
+	}
+	printk(KERN_INFO "Freeing unused kernel memory: %ldkB freed\n",
+	       (__init_end - __init_begin) >> 10);
+}
+
+void
+free_initrd_mem (unsigned long start, unsigned long end)
+{
+	struct page *page;
+	/*
+	 * EFI uses 4KB pages while the kernel can use 4KB or bigger.
+	 * Thus EFI and the kernel may have different page sizes. It is
+	 * therefore possible to have the initrd share the same page as
+	 * the end of the kernel (given current setup).
+	 *
+	 * To avoid freeing/using the wrong page (kernel sized) we:
+	 *	- align up the beginning of initrd
+	 *	- align down the end of initrd
+	 *
+	 *  |             |
+	 *  |=============| a000
+	 *  |             |
+	 *  |             |
+	 *  |             | 9000
+	 *  |/////////////|
+	 *  |/////////////|
+	 *  |=============| 8000
+	 *  |///INITRD////|
+	 *  |/////////////|
+	 *  |/////////////| 7000
+	 *  |             |
+	 *  |KKKKKKKKKKKKK|
+	 *  |=============| 6000
+	 *  |KKKKKKKKKKKKK|
+	 *  |KKKKKKKKKKKKK|
+	 *  K=kernel using 8KB pages
+	 *
+	 * In this example, we must free page 8000 ONLY. So we must align up
+	 * initrd_start and keep initrd_end as is.
+	 */
+	start = PAGE_ALIGN(start);
+	end = end & PAGE_MASK;
+
+	if (start < end)
+		printk(KERN_INFO "Freeing initrd memory: %ldkB freed\n", (end - start) >> 10);
+
+	for (; start < end; start += PAGE_SIZE) {
+		if (!virt_addr_valid(start))
+			continue;
+		page = virt_to_page(start);
+		ClearPageReserved(page);
+		set_page_count(page, 1);
+		free_page(start);
+		++totalram_pages;
+	}
+}
+
+/*
+ * This installs a clean page in the kernel's page table.
+ */
+struct page *
+put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot)
+{
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *pte;
+
+	if (!PageReserved(page))
+		printk(KERN_ERR "put_kernel_page: page at 0x%p not in reserved memory\n",
+		       page_address(page));
+
+	pgd = pgd_offset_k(address);		/* note: this is NOT pgd_offset()! */
+
+	spin_lock(&init_mm.page_table_lock);
+	{
+		pud = pud_alloc(&init_mm, pgd, address);
+		if (!pud)
+			goto out;
+
+		pmd = pmd_alloc(&init_mm, pud, address);
+		if (!pmd)
+			goto out;
+		pte = pte_alloc_map(&init_mm, pmd, address);
+		if (!pte)
+			goto out;
+		if (!pte_none(*pte)) {
+			pte_unmap(pte);
+			goto out;
+		}
+		set_pte(pte, mk_pte(page, pgprot));
+		pte_unmap(pte);
+	}
+  out:	spin_unlock(&init_mm.page_table_lock);
+	/* no need for flush_tlb */
+	return page;
+}
+
+static void
+setup_gate (void)
+{
+	struct page *page;
+
+	/*
+	 * Map the gate page twice: once read-only to export the ELF headers etc. and once
+	 * execute-only page to enable privilege-promotion via "epc":
+	 */
+	page = virt_to_page(ia64_imva(__start_gate_section));
+	put_kernel_page(page, GATE_ADDR, PAGE_READONLY);
+#ifdef HAVE_BUGGY_SEGREL
+	page = virt_to_page(ia64_imva(__start_gate_section + PAGE_SIZE));
+	put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE);
+#else
+	put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE);
+#endif
+	ia64_patch_gate();
+}
+
+void __devinit
+ia64_mmu_init (void *my_cpu_data)
+{
+	unsigned long psr, pta, impl_va_bits;
+	extern void __devinit tlb_init (void);
+
+#ifdef CONFIG_DISABLE_VHPT
+#	define VHPT_ENABLE_BIT	0
+#else
+#	define VHPT_ENABLE_BIT	1
+#endif
+
+	/* Pin mapping for percpu area into TLB */
+	psr = ia64_clear_ic();
+	ia64_itr(0x2, IA64_TR_PERCPU_DATA, PERCPU_ADDR,
+		 pte_val(pfn_pte(__pa(my_cpu_data) >> PAGE_SHIFT, PAGE_KERNEL)),
+		 PERCPU_PAGE_SHIFT);
+
+	ia64_set_psr(psr);
+	ia64_srlz_i();
+
+	/*
+	 * Check if the virtually mapped linear page table (VMLPT) overlaps with a mapped
+	 * address space.  The IA-64 architecture guarantees that at least 50 bits of
+	 * virtual address space are implemented but if we pick a large enough page size
+	 * (e.g., 64KB), the mapped address space is big enough that it will overlap with
+	 * VMLPT.  I assume that once we run on machines big enough to warrant 64KB pages,
+	 * IMPL_VA_MSB will be significantly bigger, so this is unlikely to become a
+	 * problem in practice.  Alternatively, we could truncate the top of the mapped
+	 * address space to not permit mappings that would overlap with the VMLPT.
+	 * --davidm 00/12/06
+	 */
+#	define pte_bits			3
+#	define mapped_space_bits	(3*(PAGE_SHIFT - pte_bits) + PAGE_SHIFT)
+	/*
+	 * The virtual page table has to cover the entire implemented address space within
+	 * a region even though not all of this space may be mappable.  The reason for
+	 * this is that the Access bit and Dirty bit fault handlers perform
+	 * non-speculative accesses to the virtual page table, so the address range of the
+	 * virtual page table itself needs to be covered by virtual page table.
+	 */
+#	define vmlpt_bits		(impl_va_bits - PAGE_SHIFT + pte_bits)
+#	define POW2(n)			(1ULL << (n))
+
+	impl_va_bits = ffz(~(local_cpu_data->unimpl_va_mask | (7UL << 61)));
+
+	if (impl_va_bits < 51 || impl_va_bits > 61)
+		panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1);
+
+	/* place the VMLPT at the end of each page-table mapped region: */
+	pta = POW2(61) - POW2(vmlpt_bits);
+
+	if (POW2(mapped_space_bits) >= pta)
+		panic("mm/init: overlap between virtually mapped linear page table and "
+		      "mapped kernel space!");
+	/*
+	 * Set the (virtually mapped linear) page table address.  Bit
+	 * 8 selects between the short and long format, bits 2-7 the
+	 * size of the table, and bit 0 whether the VHPT walker is
+	 * enabled.
+	 */
+	ia64_set_pta(pta | (0 << 8) | (vmlpt_bits << 2) | VHPT_ENABLE_BIT);
+
+	ia64_tlb_init();
+
+#ifdef	CONFIG_HUGETLB_PAGE
+	ia64_set_rr(HPAGE_REGION_BASE, HPAGE_SHIFT << 2);
+	ia64_srlz_d();
+#endif
+}
+
+#ifdef CONFIG_VIRTUAL_MEM_MAP
+
+int
+create_mem_map_page_table (u64 start, u64 end, void *arg)
+{
+	unsigned long address, start_page, end_page;
+	struct page *map_start, *map_end;
+	int node;
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *pte;
+
+	map_start = vmem_map + (__pa(start) >> PAGE_SHIFT);
+	map_end   = vmem_map + (__pa(end) >> PAGE_SHIFT);
+
+	start_page = (unsigned long) map_start & PAGE_MASK;
+	end_page = PAGE_ALIGN((unsigned long) map_end);
+	node = paddr_to_nid(__pa(start));
+
+	for (address = start_page; address < end_page; address += PAGE_SIZE) {
+		pgd = pgd_offset_k(address);
+		if (pgd_none(*pgd))
+			pgd_populate(&init_mm, pgd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
+		pud = pud_offset(pgd, address);
+
+		if (pud_none(*pud))
+			pud_populate(&init_mm, pud, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
+		pmd = pmd_offset(pud, address);
+
+		if (pmd_none(*pmd))
+			pmd_populate_kernel(&init_mm, pmd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
+		pte = pte_offset_kernel(pmd, address);
+
+		if (pte_none(*pte))
+			set_pte(pte, pfn_pte(__pa(alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)) >> PAGE_SHIFT,
+					     PAGE_KERNEL));
+	}
+	return 0;
+}
+
+struct memmap_init_callback_data {
+	struct page *start;
+	struct page *end;
+	int nid;
+	unsigned long zone;
+};
+
+static int
+virtual_memmap_init (u64 start, u64 end, void *arg)
+{
+	struct memmap_init_callback_data *args;
+	struct page *map_start, *map_end;
+
+	args = (struct memmap_init_callback_data *) arg;
+	map_start = vmem_map + (__pa(start) >> PAGE_SHIFT);
+	map_end   = vmem_map + (__pa(end) >> PAGE_SHIFT);
+
+	if (map_start < args->start)
+		map_start = args->start;
+	if (map_end > args->end)
+		map_end = args->end;
+
+	/*
+	 * We have to initialize "out of bounds" struct page elements that fit completely
+	 * on the same pages that were allocated for the "in bounds" elements because they
+	 * may be referenced later (and found to be "reserved").
+	 */
+	map_start -= ((unsigned long) map_start & (PAGE_SIZE - 1)) / sizeof(struct page);
+	map_end += ((PAGE_ALIGN((unsigned long) map_end) - (unsigned long) map_end)
+		    / sizeof(struct page));
+
+	if (map_start < map_end)
+		memmap_init_zone((unsigned long)(map_end - map_start),
+				 args->nid, args->zone, page_to_pfn(map_start));
+	return 0;
+}
+
+void
+memmap_init (unsigned long size, int nid, unsigned long zone,
+	     unsigned long start_pfn)
+{
+	if (!vmem_map)
+		memmap_init_zone(size, nid, zone, start_pfn);
+	else {
+		struct page *start;
+		struct memmap_init_callback_data args;
+
+		start = pfn_to_page(start_pfn);
+		args.start = start;
+		args.end = start + size;
+		args.nid = nid;
+		args.zone = zone;
+
+		efi_memmap_walk(virtual_memmap_init, &args);
+	}
+}
+
+int
+ia64_pfn_valid (unsigned long pfn)
+{
+	char byte;
+	struct page *pg = pfn_to_page(pfn);
+
+	return     (__get_user(byte, (char __user *) pg) == 0)
+		&& ((((u64)pg & PAGE_MASK) == (((u64)(pg + 1) - 1) & PAGE_MASK))
+			|| (__get_user(byte, (char __user *) (pg + 1) - 1) == 0));
+}
+EXPORT_SYMBOL(ia64_pfn_valid);
+
+int
+find_largest_hole (u64 start, u64 end, void *arg)
+{
+	u64 *max_gap = arg;
+
+	static u64 last_end = PAGE_OFFSET;
+
+	/* NOTE: this algorithm assumes efi memmap table is ordered */
+
+	if (*max_gap < (start - last_end))
+		*max_gap = start - last_end;
+	last_end = end;
+	return 0;
+}
+#endif /* CONFIG_VIRTUAL_MEM_MAP */
+
+static int
+count_reserved_pages (u64 start, u64 end, void *arg)
+{
+	unsigned long num_reserved = 0;
+	unsigned long *count = arg;
+
+	for (; start < end; start += PAGE_SIZE)
+		if (PageReserved(virt_to_page(start)))
+			++num_reserved;
+	*count += num_reserved;
+	return 0;
+}
+
+/*
+ * Boot command-line option "nolwsys" can be used to disable the use of any light-weight
+ * system call handler.  When this option is in effect, all fsyscalls will end up bubbling
+ * down into the kernel and calling the normal (heavy-weight) syscall handler.  This is
+ * useful for performance testing, but conceivably could also come in handy for debugging
+ * purposes.
+ */
+
+static int nolwsys;
+
+static int __init
+nolwsys_setup (char *s)
+{
+	nolwsys = 1;
+	return 1;
+}
+
+__setup("nolwsys", nolwsys_setup);
+
+void
+mem_init (void)
+{
+	long reserved_pages, codesize, datasize, initsize;
+	unsigned long num_pgt_pages;
+	pg_data_t *pgdat;
+	int i;
+	static struct kcore_list kcore_mem, kcore_vmem, kcore_kernel;
+
+#ifdef CONFIG_PCI
+	/*
+	 * This needs to be called _after_ the command line has been parsed but _before_
+	 * any drivers that may need the PCI DMA interface are initialized or bootmem has
+	 * been freed.
+	 */
+	platform_dma_init();
+#endif
+
+#ifndef CONFIG_DISCONTIGMEM
+	if (!mem_map)
+		BUG();
+	max_mapnr = max_low_pfn;
+#endif
+
+	high_memory = __va(max_low_pfn * PAGE_SIZE);
+
+	kclist_add(&kcore_mem, __va(0), max_low_pfn * PAGE_SIZE);
+	kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
+	kclist_add(&kcore_kernel, _stext, _end - _stext);
+
+	for_each_pgdat(pgdat)
+		totalram_pages += free_all_bootmem_node(pgdat);
+
+	reserved_pages = 0;
+	efi_memmap_walk(count_reserved_pages, &reserved_pages);
+
+	codesize =  (unsigned long) _etext - (unsigned long) _stext;
+	datasize =  (unsigned long) _edata - (unsigned long) _etext;
+	initsize =  (unsigned long) __init_end - (unsigned long) __init_begin;
+
+	printk(KERN_INFO "Memory: %luk/%luk available (%luk code, %luk reserved, "
+	       "%luk data, %luk init)\n", (unsigned long) nr_free_pages() << (PAGE_SHIFT - 10),
+	       num_physpages << (PAGE_SHIFT - 10), codesize >> 10,
+	       reserved_pages << (PAGE_SHIFT - 10), datasize >> 10, initsize >> 10);
+
+	/*
+	 * Allow for enough (cached) page table pages so that we can map the entire memory
+	 * at least once.  Each task also needs a couple of page tables pages, so add in a
+	 * fudge factor for that (don't use "threads-max" here; that would be wrong!).
+	 * Don't allow the cache to be more than 10% of total memory, though.
+	 */
+#	define NUM_TASKS	500	/* typical number of tasks */
+	num_pgt_pages = nr_free_pages() / PTRS_PER_PGD + NUM_TASKS;
+	if (num_pgt_pages > nr_free_pages() / 10)
+		num_pgt_pages = nr_free_pages() / 10;
+	if (num_pgt_pages > (u64) pgt_cache_water[1])
+		pgt_cache_water[1] = num_pgt_pages;
+
+	/*
+	 * For fsyscall entrpoints with no light-weight handler, use the ordinary
+	 * (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry
+	 * code can tell them apart.
+	 */
+	for (i = 0; i < NR_syscalls; ++i) {
+		extern unsigned long fsyscall_table[NR_syscalls];
+		extern unsigned long sys_call_table[NR_syscalls];
+
+		if (!fsyscall_table[i] || nolwsys)
+			fsyscall_table[i] = sys_call_table[i] | 1;
+	}
+	setup_gate();
+
+#ifdef CONFIG_IA32_SUPPORT
+	ia32_mem_init();
+#endif
+}