#include <asm/apic.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
+#include <asm/sections.h>
mmu_gather_t mmu_gathers[NR_CPUS];
unsigned long highstart_pfn, highend_pfn;
/*
- * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
- * physical space so we can cache the place of the first one and move
- * around without checking the pgd every time.
+ * Creates a middle page table and puts a pointer to it in the
+ * given global directory entry. This only returns the gd entry
+ * in non-PAE compilation mode, since the middle layer is folded.
*/
+static pmd_t * __init one_md_table_init(pgd_t *pgd)
+{
+ pmd_t *pmd_table;
+
+#if CONFIG_X86_PAE
+ pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+ set_pgd(pgd, __pgd(__pa(md_table) | _PAGE_PRESENT));
+ if (pmd_table != pmd_offset(pgd, 0))
+ BUG();
+#else
+ pmd_table = pmd_offset(pgd, 0);
+#endif
+
+ return pmd_table;
+}
+
+/*
+ * Create a page table and place a pointer to it in a middle page
+ * directory entry.
+ */
+static pte_t * __init one_page_table_init(pmd_t *pmd)
+{
+ pte_t *page_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+ set_pmd(pmd, __pmd(__pa(page_table) | _KERNPG_TABLE));
+ if (page_table != pte_offset_kernel(pmd, 0))
+ BUG();
+
+ return page_table;
+}
+
+/*
+ * This function initializes a certain range of kernel virtual memory
+ * with new bootmem page tables, everywhere page tables are missing in
+ * the given range.
+ */
+
+/*
+ * NOTE: The pagetables are allocated contiguous on the physical space
+ * so we can cache the place of the first one and move around without
+ * checking the pgd every time.
+ */
+static void __init page_table_range_init (unsigned long start, unsigned long end, pgd_t *pgd_base)
+{
+ pgd_t *pgd;
+ pmd_t *pmd;
+ int pgd_ofs, pmd_ofs;
+ unsigned long vaddr;
+
+ vaddr = start;
+ pgd_ofs = __pgd_offset(vaddr);
+ pmd_ofs = __pmd_offset(vaddr);
+ pgd = pgd_base + pgd_ofs;
+
+ for ( ; (pgd_ofs < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_ofs++) {
+ if (pgd_none(*pgd))
+ one_md_table_init(pgd);
+
+ pmd = pmd_offset(pgd, vaddr);
+ for (; (pmd_ofs < PTRS_PER_PMD) && (vaddr != end); pmd++, pmd_ofs++) {
+ if (pmd_none(*pmd))
+ one_page_table_init(pmd);
+
+ vaddr += PMD_SIZE;
+ }
+ pmd_ofs = 0;
+ }
+}
+
+/*
+ * This maps the physical memory to kernel virtual address space, a total
+ * of max_low_pfn pages, by creating page tables starting from address
+ * PAGE_OFFSET.
+ */
+static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
+{
+ unsigned long pfn;
+ pgd_t *pgd;
+ pmd_t *pmd;
+ pte_t *pte;
+ int pgd_ofs, pmd_ofs, pte_ofs;
+
+ pgd_ofs = __pgd_offset(PAGE_OFFSET);
+ pgd = pgd_base + pgd_ofs;
+ pfn = 0;
+
+ for (; pgd_ofs < PTRS_PER_PGD && pfn < max_low_pfn; pgd++, pgd_ofs++) {
+ pmd = one_md_table_init(pgd);
+ for (pmd_ofs = 0; pmd_ofs < PTRS_PER_PMD && pfn < max_low_pfn; pmd++, pmd_ofs++) {
+ /* Map with big pages if possible, otherwise create normal page tables. */
+ if (cpu_has_pse) {
+ set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE));
+ pfn += PTRS_PER_PTE;
+ } else {
+ pte = one_page_table_init(pmd);
+
+ for (pte_ofs = 0; pte_ofs < PTRS_PER_PTE && pfn < max_low_pfn; pte++, pfn++, pte_ofs++)
+ set_pte(pte, pfn_pte(pfn, PAGE_KERNEL));
+ }
+ }
+ }
+}
+
+static inline int page_kills_ppro(unsigned long pagenr)
+{
+ if (pagenr >= 0x70000 && pagenr <= 0x7003F)
+ return 1;
+ return 0;
+}
+
+static inline int page_is_ram(unsigned long pagenr)
+{
+ int i;
+
+ for (i = 0; i < e820.nr_map; i++) {
+ unsigned long addr, end;
+
+ if (e820.map[i].type != E820_RAM) /* not usable memory */
+ continue;
+ /*
+ * !!!FIXME!!! Some BIOSen report areas as RAM that
+ * are not. Notably the 640->1Mb area. We need a sanity
+ * check here.
+ */
+ addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT;
+ end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT;
+ if ((pagenr >= addr) && (pagenr < end))
+ return 1;
+ }
+ return 0;
+}
#if CONFIG_HIGHMEM
pte_t *kmap_pte;
kmap_prot = PAGE_KERNEL;
}
-#endif /* CONFIG_HIGHMEM */
-void show_mem(void)
-{
- int i, total = 0, reserved = 0;
- int shared = 0, cached = 0;
- int highmem = 0;
-
- printk("Mem-info:\n");
- show_free_areas();
- printk("Free swap: %6dkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
- i = max_mapnr;
- while (i-- > 0) {
- total++;
- if (PageHighMem(mem_map+i))
- highmem++;
- if (PageReserved(mem_map+i))
- reserved++;
- else if (PageSwapCache(mem_map+i))
- cached++;
- else if (page_count(mem_map+i))
- shared += page_count(mem_map+i) - 1;
- }
- printk("%d pages of RAM\n", total);
- printk("%d pages of HIGHMEM\n",highmem);
- printk("%d reserved pages\n",reserved);
- printk("%d pages shared\n",shared);
- printk("%d pages swap cached\n",cached);
-}
-
-/* References to section boundaries */
-
-extern char _text, _etext, _edata, __bss_start, _end;
-extern char __init_begin, __init_end;
-
-static inline void set_pte_phys (unsigned long vaddr,
- unsigned long phys, pgprot_t flags)
+void __init permanent_kmaps_init(pgd_t *pgd_base)
{
pgd_t *pgd;
pmd_t *pmd;
pte_t *pte;
+ unsigned long vaddr;
+
+ vaddr = PKMAP_BASE;
+ page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
pgd = swapper_pg_dir + __pgd_offset(vaddr);
- if (pgd_none(*pgd)) {
- printk("PAE BUG #00!\n");
- return;
- }
pmd = pmd_offset(pgd, vaddr);
- if (pmd_none(*pmd)) {
- printk("PAE BUG #01!\n");
- return;
- }
pte = pte_offset_kernel(pmd, vaddr);
- /* <phys,flags> stored as-is, to permit clearing entries */
- set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
-
- /*
- * It's enough to flush this one mapping.
- * (PGE mappings get flushed as well)
- */
- __flush_tlb_one(vaddr);
+ pkmap_page_table = pte;
}
-void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags)
+void __init set_highmem_pages_init(int bad_ppro)
{
- unsigned long address = __fix_to_virt(idx);
+ int pfn;
+ for (pfn = highstart_pfn; pfn < highend_pfn; pfn++) {
+ struct page *page = mem_map + pfn;
- if (idx >= __end_of_fixed_addresses) {
- printk("Invalid __set_fixmap\n");
- return;
- }
- set_pte_phys(address, phys, flags);
-}
-
-static void __init fixrange_init (unsigned long start, unsigned long end, pgd_t *pgd_base)
-{
- pgd_t *pgd;
- pmd_t *pmd;
- pte_t *pte;
- int i, j;
- unsigned long vaddr;
-
- vaddr = start;
- i = __pgd_offset(vaddr);
- j = __pmd_offset(vaddr);
- pgd = pgd_base + i;
-
- for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
-#if CONFIG_X86_PAE
- if (pgd_none(*pgd)) {
- pmd = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE);
- set_pgd(pgd, __pgd(__pa(pmd) + 0x1));
- if (pmd != pmd_offset(pgd, 0))
- printk("PAE BUG #02!\n");
+ if (!page_is_ram(pfn)) {
+ SetPageReserved(page);
+ continue;
}
- pmd = pmd_offset(pgd, vaddr);
-#else
- pmd = (pmd_t *)pgd;
-#endif
- for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) {
- if (pmd_none(*pmd)) {
- pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
- set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)));
- if (pte != pte_offset_kernel(pmd, 0))
- BUG();
- }
- vaddr += PMD_SIZE;
+ if (bad_ppro && page_kills_ppro(pfn))
+ {
+ SetPageReserved(page);
+ continue;
}
- j = 0;
+ ClearPageReserved(page);
+ set_bit(PG_highmem, &page->flags);
+ atomic_set(&page->count, 1);
+ __free_page(page);
+ totalhigh_pages++;
}
+ totalram_pages += totalhigh_pages;
}
+#else
+#define kmap_init() do { } while (0)
+#define permanent_kmaps_init(pgd_base) do { } while (0)
+#define set_highmem_pages_init(bad_ppro) do { } while (0)
+#endif /* CONFIG_HIGHMEM */
+
unsigned long __PAGE_KERNEL = _PAGE_KERNEL;
static void __init pagetable_init (void)
{
- unsigned long vaddr, pfn;
- pgd_t *pgd, *pgd_base;
- int i, j, k;
- pmd_t *pmd;
- pte_t *pte, *pte_base;
+ unsigned long vaddr;
+ pgd_t *pgd_base = swapper_pg_dir;
+ int i;
- pgd_base = swapper_pg_dir;
#if CONFIG_X86_PAE
+ /* Init entries of the first-level page table to the zero page */
for (i = 0; i < PTRS_PER_PGD; i++)
set_pgd(pgd_base + i, __pgd(__pa(empty_zero_page) | _PAGE_PRESENT));
#endif
+
+ /* Enable PSE if available */
if (cpu_has_pse) {
set_in_cr4(X86_CR4_PSE);
}
+
+ /* Enable PGE if available */
if (cpu_has_pge) {
set_in_cr4(X86_CR4_PGE);
__PAGE_KERNEL |= _PAGE_GLOBAL;
}
- i = __pgd_offset(PAGE_OFFSET);
- pfn = 0;
- pgd = pgd_base + i;
-
- for (; i < PTRS_PER_PGD && pfn < max_low_pfn; pgd++, i++) {
-#if CONFIG_X86_PAE
- pmd = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE);
- set_pgd(pgd, __pgd(__pa(pmd) | _PAGE_PRESENT));
-#else
- pmd = (pmd_t *) pgd;
-#endif
- for (j = 0; j < PTRS_PER_PMD && pfn < max_low_pfn; pmd++, j++) {
- if (cpu_has_pse) {
- set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE));
- pfn += PTRS_PER_PTE;
- } else {
- pte_base = pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
-
- for (k = 0; k < PTRS_PER_PTE && pfn < max_low_pfn; pte++, pfn++, k++)
- set_pte(pte, pfn_pte(pfn, PAGE_KERNEL));
-
- set_pmd(pmd, __pmd(__pa(pte_base) | _KERNPG_TABLE));
- }
- }
- }
+ kernel_physical_mapping_init(pgd_base);
/*
* Fixed mappings, only the page table structure has to be
* created - mappings will be set by set_fixmap():
*/
vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
- fixrange_init(vaddr, 0, pgd_base);
+ page_table_range_init(vaddr, 0, pgd_base);
-#if CONFIG_HIGHMEM
- /*
- * Permanent kmaps:
- */
- vaddr = PKMAP_BASE;
- fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
-
- pgd = swapper_pg_dir + __pgd_offset(vaddr);
- pmd = pmd_offset(pgd, vaddr);
- pte = pte_offset_kernel(pmd, vaddr);
- pkmap_page_table = pte;
-#endif
+ permanent_kmaps_init(pgd_base);
#if CONFIG_X86_PAE
/*
flush_tlb_all();
}
+void __init zone_sizes_init(void)
+{
+ unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+ unsigned int max_dma, high, low;
+
+ max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
+ low = max_low_pfn;
+ high = highend_pfn;
+
+ if (low < max_dma)
+ zones_size[ZONE_DMA] = low;
+ else {
+ zones_size[ZONE_DMA] = max_dma;
+ zones_size[ZONE_NORMAL] = low - max_dma;
+#ifdef CONFIG_HIGHMEM
+ zones_size[ZONE_HIGHMEM] = high - low;
+#endif
+ }
+ free_area_init(zones_size);
+}
+
/*
* paging_init() sets up the page tables - note that the first 8MB are
* already mapped by head.S.
if (cpu_has_pae)
set_in_cr4(X86_CR4_PAE);
#endif
-
__flush_tlb_all();
-#ifdef CONFIG_HIGHMEM
kmap_init();
-#endif
- {
- unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
- unsigned int max_dma, high, low;
-
- max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
- low = max_low_pfn;
- high = highend_pfn;
-
- if (low < max_dma)
- zones_size[ZONE_DMA] = low;
- else {
- zones_size[ZONE_DMA] = max_dma;
- zones_size[ZONE_NORMAL] = low - max_dma;
-#ifdef CONFIG_HIGHMEM
- zones_size[ZONE_HIGHMEM] = high - low;
-#endif
- }
- free_area_init(zones_size);
- }
- return;
+ zone_sizes_init();
}
/*
printk("Ok.\n");
}
}
-
-static inline int page_is_ram (unsigned long pagenr)
-{
- int i;
-
- for (i = 0; i < e820.nr_map; i++) {
- unsigned long addr, end;
-
- if (e820.map[i].type != E820_RAM) /* not usable memory */
- continue;
- /*
- * !!!FIXME!!! Some BIOSen report areas as RAM that
- * are not. Notably the 640->1Mb area. We need a sanity
- * check here.
- */
- addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT;
- end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT;
- if ((pagenr >= addr) && (pagenr < end))
- return 1;
- }
- return 0;
-}
-
-static inline int page_kills_ppro(unsigned long pagenr)
-{
- if(pagenr >= 0x70000 && pagenr <= 0x7003F)
- return 1;
- return 0;
-}
void __init mem_init(void)
{
*/
if (page_is_ram(tmp) && PageReserved(mem_map+tmp))
reservedpages++;
-#ifdef CONFIG_HIGHMEM
- for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
- struct page *page = mem_map + tmp;
- if (!page_is_ram(tmp)) {
- SetPageReserved(page);
- continue;
- }
- if (bad_ppro && page_kills_ppro(tmp))
- {
- SetPageReserved(page);
- continue;
- }
- ClearPageReserved(page);
- set_bit(PG_highmem, &page->flags);
- atomic_set(&page->count, 1);
- __free_page(page);
- totalhigh_pages++;
- }
- totalram_pages += totalhigh_pages;
-#endif
+ set_highmem_pages_init(bad_ppro);
+
codesize = (unsigned long) &_etext - (unsigned long) &_text;
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
#ifndef CONFIG_SMP
zap_low_mappings();
#endif
+}
+
+#if CONFIG_X86_PAE
+struct kmem_cache_s *pae_pgd_cachep;
+void __init pgtable_cache_init(void)
+{
+ /*
+ * PAE pgds must be 16-byte aligned:
+ */
+ pae_pgd_cachep = kmem_cache_create("pae_pgd", 32, 0,
+ SLAB_HWCACHE_ALIGN | SLAB_MUST_HWCACHE_ALIGN, NULL, NULL);
+ if (!pae_pgd_cachep)
+ panic("init_pae(): Cannot alloc pae_pgd SLAB cache");
}
+#endif
/* Put this after the callers, so that it cannot be inlined */
static int do_test_wp_bit(unsigned long vaddr)
}
}
#endif
-
-#if defined(CONFIG_X86_PAE)
-static struct kmem_cache_s *pae_pgd_cachep;
-
-void __init pgtable_cache_init(void)
-{
- /*
- * PAE pgds must be 16-byte aligned:
- */
- pae_pgd_cachep = kmem_cache_create("pae_pgd", 32, 0,
- SLAB_HWCACHE_ALIGN | SLAB_MUST_HWCACHE_ALIGN, NULL, NULL);
- if (!pae_pgd_cachep)
- panic("init_pae(): Cannot alloc pae_pgd SLAB cache");
-}
-
-pgd_t *pgd_alloc(struct mm_struct *mm)
-{
- int i;
- pgd_t *pgd = kmem_cache_alloc(pae_pgd_cachep, GFP_KERNEL);
-
- if (pgd) {
- for (i = 0; i < USER_PTRS_PER_PGD; i++) {
- unsigned long pmd = __get_free_page(GFP_KERNEL);
- if (!pmd)
- goto out_oom;
- clear_page(pmd);
- set_pgd(pgd + i, __pgd(1 + __pa(pmd)));
- }
- memcpy(pgd + USER_PTRS_PER_PGD,
- swapper_pg_dir + USER_PTRS_PER_PGD,
- (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
- }
- return pgd;
-out_oom:
- for (i--; i >= 0; i--)
- free_page((unsigned long)__va(pgd_val(pgd[i])-1));
- kmem_cache_free(pae_pgd_cachep, pgd);
- return NULL;
-}
-
-void pgd_free(pgd_t *pgd)
-{
- int i;
-
- for (i = 0; i < USER_PTRS_PER_PGD; i++)
- free_page((unsigned long)__va(pgd_val(pgd[i])-1));
- kmem_cache_free(pae_pgd_cachep, pgd);
-}
-
-#else
-
-pgd_t *pgd_alloc(struct mm_struct *mm)
-{
- pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
-
- if (pgd) {
- memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
- memcpy(pgd + USER_PTRS_PER_PGD,
- swapper_pg_dir + USER_PTRS_PER_PGD,
- (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
- }
- return pgd;
-}
-
-void pgd_free(pgd_t *pgd)
-{
- free_page((unsigned long)pgd);
-}
-#endif /* CONFIG_X86_PAE */
-
-pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
-{
- int count = 0;
- pte_t *pte;
-
- do {
- pte = (pte_t *) __get_free_page(GFP_KERNEL);
- if (pte)
- clear_page(pte);
- else {
- current->state = TASK_UNINTERRUPTIBLE;
- schedule_timeout(HZ);
- }
- } while (!pte && (count++ < 10));
- return pte;
-}
-
-struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
-{
- int count = 0;
- struct page *pte;
-
- do {
-#if CONFIG_HIGHPTE
- pte = alloc_pages(GFP_KERNEL | __GFP_HIGHMEM, 0);
-#else
- pte = alloc_pages(GFP_KERNEL, 0);
-#endif
- if (pte)
- clear_highpage(pte);
- else {
- current->state = TASK_UNINTERRUPTIBLE;
- schedule_timeout(HZ);
- }
- } while (!pte && (count++ < 10));
- return pte;
-}
--- /dev/null
+/*
+ * linux/arch/i386/mm/pgtable.c
+ */
+
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/smp.h>
+#include <linux/highmem.h>
+#include <linux/slab.h>
+
+#include <asm/system.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/fixmap.h>
+#include <asm/e820.h>
+#include <asm/tlb.h>
+#include <asm/tlbflush.h>
+
+void show_mem(void)
+{
+ int i, total = 0, reserved = 0;
+ int shared = 0, cached = 0;
+ int highmem = 0;
+
+ printk("Mem-info:\n");
+ show_free_areas();
+ printk("Free swap: %6dkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
+ i = max_mapnr;
+ while (i-- > 0) {
+ total++;
+ if (PageHighMem(mem_map+i))
+ highmem++;
+ if (PageReserved(mem_map+i))
+ reserved++;
+ else if (PageSwapCache(mem_map+i))
+ cached++;
+ else if (page_count(mem_map+i))
+ shared += page_count(mem_map+i) - 1;
+ }
+ printk("%d pages of RAM\n", total);
+ printk("%d pages of HIGHMEM\n",highmem);
+ printk("%d reserved pages\n",reserved);
+ printk("%d pages shared\n",shared);
+ printk("%d pages swap cached\n",cached);
+}
+
+/*
+ * Associate a virtual page frame with a given physical page frame
+ * and protection flags for that frame.
+ */
+static void set_pte_phys (unsigned long vaddr, unsigned long phys, pgprot_t flags)
+{
+ pgd_t *pgd;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ pgd = swapper_pg_dir + __pgd_offset(vaddr);
+ if (pgd_none(*pgd)) {
+ BUG();
+ return;
+ }
+ pmd = pmd_offset(pgd, vaddr);
+ if (pmd_none(*pmd)) {
+ BUG();
+ return;
+ }
+ pte = pte_offset_kernel(pmd, vaddr);
+ /* <phys,flags> stored as-is, to permit clearing entries */
+ set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
+
+ /*
+ * It's enough to flush this one mapping.
+ * (PGE mappings get flushed as well)
+ */
+ __flush_tlb_one(vaddr);
+}
+
+void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags)
+{
+ unsigned long address = __fix_to_virt(idx);
+
+ if (idx >= __end_of_fixed_addresses) {
+ BUG();
+ return;
+ }
+ set_pte_phys(address, phys, flags);
+}
+
+pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
+{
+ int count = 0;
+ pte_t *pte;
+
+ do {
+ pte = (pte_t *) __get_free_page(GFP_KERNEL);
+ if (pte)
+ clear_page(pte);
+ else {
+ current->state = TASK_UNINTERRUPTIBLE;
+ schedule_timeout(HZ);
+ }
+ } while (!pte && (count++ < 10));
+ return pte;
+}
+
+struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+{
+ int count = 0;
+ struct page *pte;
+
+ do {
+#if CONFIG_HIGHPTE
+ pte = alloc_pages(GFP_KERNEL | __GFP_HIGHMEM, 0);
+#else
+ pte = alloc_pages(GFP_KERNEL, 0);
+#endif
+ if (pte)
+ clear_highpage(pte);
+ else {
+ current->state = TASK_UNINTERRUPTIBLE;
+ schedule_timeout(HZ);
+ }
+ } while (!pte && (count++ < 10));
+ return pte;
+}
+
+#if CONFIG_X86_PAE
+
+pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+ int i;
+ pgd_t *pgd = kmem_cache_alloc(pae_pgd_cachep, GFP_KERNEL);
+
+ if (pgd) {
+ for (i = 0; i < USER_PTRS_PER_PGD; i++) {
+ unsigned long pmd = __get_free_page(GFP_KERNEL);
+ if (!pmd)
+ goto out_oom;
+ clear_page(pmd);
+ set_pgd(pgd + i, __pgd(1 + __pa(pmd)));
+ }
+ memcpy(pgd + USER_PTRS_PER_PGD,
+ swapper_pg_dir + USER_PTRS_PER_PGD,
+ (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
+ }
+ return pgd;
+out_oom:
+ for (i--; i >= 0; i--)
+ free_page((unsigned long)__va(pgd_val(pgd[i])-1));
+ kmem_cache_free(pae_pgd_cachep, pgd);
+ return NULL;
+}
+
+void pgd_free(pgd_t *pgd)
+{
+ int i;
+
+ for (i = 0; i < USER_PTRS_PER_PGD; i++)
+ free_page((unsigned long)__va(pgd_val(pgd[i])-1));
+ kmem_cache_free(pae_pgd_cachep, pgd);
+}
+
+#else
+
+pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+ pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
+
+ if (pgd) {
+ memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
+ memcpy(pgd + USER_PTRS_PER_PGD,
+ swapper_pg_dir + USER_PTRS_PER_PGD,
+ (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
+ }
+ return pgd;
+}
+
+void pgd_free(pgd_t *pgd)
+{
+ free_page((unsigned long)pgd);
+}
+
+#endif /* CONFIG_X86_PAE */
+
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