1 files changed, 60 insertions, 321 deletions

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index ea5ad1e3672d..66d6be85df82 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -48,6 +48,7 @@
 #include <asm/kdebug.h>
 #include <asm/numa.h>
 #include <asm/cacheflush.h>
+#include <asm/init.h>
 
 /*
  * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
@@ -61,12 +62,6 @@ static unsigned long dma_reserve __initdata;
 
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 
-int direct_gbpages
-#ifdef CONFIG_DIRECT_GBPAGES
-                                = 1
-#endif
-;
-
 static int __init parse_direct_gbpages_off(char *arg)
 {
         direct_gbpages = 0;
@@ -87,8 +82,6 @@ early_param("gbpages", parse_direct_gbpages_on);
  * around without checking the pgd every time.
  */
 
-int after_bootmem;
-
 pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP;
 EXPORT_SYMBOL_GPL(__supported_pte_mask);
 
@@ -168,34 +161,51 @@ static __ref void *spp_getpage(void)
         return ptr;
 }
 
-void
-set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
+static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr)
 {
-        pud_t *pud;
-        pmd_t *pmd;
-        pte_t *pte;
+        if (pgd_none(*pgd)) {
+                pud_t *pud = (pud_t *)spp_getpage();
+                pgd_populate(&init_mm, pgd, pud);
+                if (pud != pud_offset(pgd, 0))
+                        printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
+                               pud, pud_offset(pgd, 0));
+        }
+        return pud_offset(pgd, vaddr);
+}
 
-        pud = pud_page + pud_index(vaddr);
+static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
+{
         if (pud_none(*pud)) {
-                pmd = (pmd_t *) spp_getpage();
+                pmd_t *pmd = (pmd_t *) spp_getpage();
                 pud_populate(&init_mm, pud, pmd);
-                if (pmd != pmd_offset(pud, 0)) {
+                if (pmd != pmd_offset(pud, 0))
                         printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
-                                pmd, pmd_offset(pud, 0));
-                        return;
-                }
+                               pmd, pmd_offset(pud, 0));
         }
-        pmd = pmd_offset(pud, vaddr);
+        return pmd_offset(pud, vaddr);
+}
+
+static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
+{
         if (pmd_none(*pmd)) {
-                pte = (pte_t *) spp_getpage();
+                pte_t *pte = (pte_t *) spp_getpage();
                 pmd_populate_kernel(&init_mm, pmd, pte);
-                if (pte != pte_offset_kernel(pmd, 0)) {
+                if (pte != pte_offset_kernel(pmd, 0))
                         printk(KERN_ERR "PAGETABLE BUG #02!\n");
-                        return;
-                }
         }
+        return pte_offset_kernel(pmd, vaddr);
+}
+
+void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
+{
+        pud_t *pud;
+        pmd_t *pmd;
+        pte_t *pte;
+
+        pud = pud_page + pud_index(vaddr);
+        pmd = fill_pmd(pud, vaddr);
+        pte = fill_pte(pmd, vaddr);
 
-        pte = pte_offset_kernel(pmd, vaddr);
         set_pte(pte, new_pte);
 
         /*
@@ -205,8 +215,7 @@ set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
         __flush_tlb_one(vaddr);
 }
 
-void
-set_pte_vaddr(unsigned long vaddr, pte_t pteval)
+void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
 {
         pgd_t *pgd;
         pud_t *pud_page;
@@ -223,6 +232,24 @@ set_pte_vaddr(unsigned long vaddr, pte_t pteval)
         set_pte_vaddr_pud(pud_page, vaddr, pteval);
 }
 
+pmd_t * __init populate_extra_pmd(unsigned long vaddr)
+{
+        pgd_t *pgd;
+        pud_t *pud;
+
+        pgd = pgd_offset_k(vaddr);
+        pud = fill_pud(pgd, vaddr);
+        return fill_pmd(pud, vaddr);
+}
+
+pte_t * __init populate_extra_pte(unsigned long vaddr)
+{
+        pmd_t *pmd;
+
+        pmd = populate_extra_pmd(vaddr);
+        return fill_pte(pmd, vaddr);
+}
+
 /*
  * Create large page table mappings for a range of physical addresses.
  */
@@ -291,13 +318,9 @@ void __init cleanup_highmap(void)
         }
 }
 
-static unsigned long __initdata table_start;
-static unsigned long __meminitdata table_end;
-static unsigned long __meminitdata table_top;
-
 static __ref void *alloc_low_page(unsigned long *phys)
 {
-        unsigned long pfn = table_end++;
+        unsigned long pfn = e820_table_end++;
         void *adr;
 
         if (after_bootmem) {
@@ -307,7 +330,7 @@ static __ref void *alloc_low_page(unsigned long *phys)
                 return adr;
         }
 
-        if (pfn >= table_top)
+        if (pfn >= e820_table_top)
                 panic("alloc_low_page: ran out of memory");
 
         adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE);
@@ -547,58 +570,10 @@ phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end,
         return phys_pud_init(pud, addr, end, page_size_mask);
 }
 
-static void __init find_early_table_space(unsigned long end, int use_pse,
-                                          int use_gbpages)
-{
-        unsigned long puds, pmds, ptes, tables, start;
-
-        puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
-        tables = roundup(puds * sizeof(pud_t), PAGE_SIZE);
-        if (use_gbpages) {
-                unsigned long extra;
-                extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT);
-                pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT;
-        } else
-                pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
-        tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE);
-
-        if (use_pse) {
-                unsigned long extra;
-                extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
-                ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
-        } else
-                ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
-        tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE);
-
-        /*
-         * RED-PEN putting page tables only on node 0 could
-         * cause a hotspot and fill up ZONE_DMA. The page tables
-         * need roughly 0.5KB per GB.
-         */
-        start = 0x8000;
-        table_start = find_e820_area(start, end, tables, PAGE_SIZE);
-        if (table_start == -1UL)
-                panic("Cannot find space for the kernel page tables");
-
-        table_start >>= PAGE_SHIFT;
-        table_end = table_start;
-        table_top = table_start + (tables >> PAGE_SHIFT);
-
-        printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",
-                end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT);
-}
-
-static void __init init_gbpages(void)
-{
-        if (direct_gbpages && cpu_has_gbpages)
-                printk(KERN_INFO "Using GB pages for direct mapping\n");
-        else
-                direct_gbpages = 0;
-}
-
-static unsigned long __meminit kernel_physical_mapping_init(unsigned long start,
-                                                unsigned long end,
-                                                unsigned long page_size_mask)
+unsigned long __init
+kernel_physical_mapping_init(unsigned long start,
+                             unsigned long end,
+                             unsigned long page_size_mask)
 {
 
         unsigned long next, last_map_addr = end;
@@ -635,176 +610,6 @@ static unsigned long __meminit kernel_physical_mapping_init(unsigned long start,
         return last_map_addr;
 }
 
-struct map_range {
-        unsigned long start;
-        unsigned long end;
-        unsigned page_size_mask;
-};
-
-#define NR_RANGE_MR 5
-
-static int save_mr(struct map_range *mr, int nr_range,
-                   unsigned long start_pfn, unsigned long end_pfn,
-                   unsigned long page_size_mask)
-{
-
-        if (start_pfn < end_pfn) {
-                if (nr_range >= NR_RANGE_MR)
-                        panic("run out of range for init_memory_mapping\n");
-                mr[nr_range].start = start_pfn<<PAGE_SHIFT;
-                mr[nr_range].end   = end_pfn<<PAGE_SHIFT;
-                mr[nr_range].page_size_mask = page_size_mask;
-                nr_range++;
-        }
-
-        return nr_range;
-}
-
-/*
- * Setup the direct mapping of the physical memory at PAGE_OFFSET.
- * This runs before bootmem is initialized and gets pages directly from
- * the physical memory. To access them they are temporarily mapped.
- */
-unsigned long __init_refok init_memory_mapping(unsigned long start,
-                                               unsigned long end)
-{
-        unsigned long last_map_addr = 0;
-        unsigned long page_size_mask = 0;
-        unsigned long start_pfn, end_pfn;
-        unsigned long pos;
-
-        struct map_range mr[NR_RANGE_MR];
-        int nr_range, i;
-        int use_pse, use_gbpages;
-
-        printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end);
-
-        /*
-         * Find space for the kernel direct mapping tables.
-         *
-         * Later we should allocate these tables in the local node of the
-         * memory mapped. Unfortunately this is done currently before the
-         * nodes are discovered.
-         */
-        if (!after_bootmem)
-                init_gbpages();
-
-#ifdef CONFIG_DEBUG_PAGEALLOC
-        /*
-         * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
-         * This will simplify cpa(), which otherwise needs to support splitting
-         * large pages into small in interrupt context, etc.
-         */
-        use_pse = use_gbpages = 0;
-#else
-        use_pse = cpu_has_pse;
-        use_gbpages = direct_gbpages;
-#endif
-
-        if (use_gbpages)
-                page_size_mask |= 1 << PG_LEVEL_1G;
-        if (use_pse)
-                page_size_mask |= 1 << PG_LEVEL_2M;
-
-        memset(mr, 0, sizeof(mr));
-        nr_range = 0;
-
-        /* head if not big page alignment ?*/
-        start_pfn = start >> PAGE_SHIFT;
-        pos = start_pfn << PAGE_SHIFT;
-        end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
-                        << (PMD_SHIFT - PAGE_SHIFT);
-        if (end_pfn > (end >> PAGE_SHIFT))
-                end_pfn = end >> PAGE_SHIFT;
-        if (start_pfn < end_pfn) {
-                nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
-                pos = end_pfn << PAGE_SHIFT;
-        }
-
-        /* big page (2M) range*/
-        start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
-                         << (PMD_SHIFT - PAGE_SHIFT);
-        end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
-                         << (PUD_SHIFT - PAGE_SHIFT);
-        if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)))
-                end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT));
-        if (start_pfn < end_pfn) {
-                nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
-                                page_size_mask & (1<<PG_LEVEL_2M));
-                pos = end_pfn << PAGE_SHIFT;
-        }
-
-        /* big page (1G) range */
-        start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT)
-                         << (PUD_SHIFT - PAGE_SHIFT);
-        end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT);
-        if (start_pfn < end_pfn) {
-                nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
-                                page_size_mask &
-                                 ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G)));
-                pos = end_pfn << PAGE_SHIFT;
-        }
-
-        /* tail is not big page (1G) alignment */
-        start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
-                         << (PMD_SHIFT - PAGE_SHIFT);
-        end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
-        if (start_pfn < end_pfn) {
-                nr_range = save_mr(mr, nr_range, start_pfn, end_pfn,
-                                page_size_mask & (1<<PG_LEVEL_2M));
-                pos = end_pfn << PAGE_SHIFT;
-        }
-
-        /* tail is not big page (2M) alignment */
-        start_pfn = pos>>PAGE_SHIFT;
-        end_pfn = end>>PAGE_SHIFT;
-        nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);
-
-        /* try to merge same page size and continuous */
-        for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
-                unsigned long old_start;
-                if (mr[i].end != mr[i+1].start ||
-                    mr[i].page_size_mask != mr[i+1].page_size_mask)
-                        continue;
-                /* move it */
-                old_start = mr[i].start;
-                memmove(&mr[i], &mr[i+1],
-                         (nr_range - 1 - i) * sizeof (struct map_range));
-                mr[i--].start = old_start;
-                nr_range--;
-        }
-
-        for (i = 0; i < nr_range; i++)
-                printk(KERN_DEBUG " %010lx - %010lx page %s\n",
-                                mr[i].start, mr[i].end,
-                        (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
-                         (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
-
-        if (!after_bootmem)
-                find_early_table_space(end, use_pse, use_gbpages);
-
-        for (i = 0; i < nr_range; i++)
-                last_map_addr = kernel_physical_mapping_init(
-                                        mr[i].start, mr[i].end,
-                                        mr[i].page_size_mask);
-
-        if (!after_bootmem)
-                mmu_cr4_features = read_cr4();
-        __flush_tlb_all();
-
-        if (!after_bootmem && table_end > table_start)
-                reserve_early(table_start << PAGE_SHIFT,
-                                 table_end << PAGE_SHIFT, "PGTABLE");
-
-        printk(KERN_INFO "last_map_addr: %lx end: %lx\n",
-                         last_map_addr, end);
-
-        if (!after_bootmem)
-                early_memtest(start, end);
-
-        return last_map_addr >> PAGE_SHIFT;
-}
-
 #ifndef CONFIG_NUMA
 void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn)
 {
@@ -876,28 +681,6 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 
 #endif /* CONFIG_MEMORY_HOTPLUG */
 
-/*
- * devmem_is_allowed() checks to see if /dev/mem access to a certain address
- * is valid. The argument is a physical page number.
- *
- *
- * On x86, access has to be given to the first megabyte of ram because that area
- * contains bios code and data regions used by X and dosemu and similar apps.
- * Access has to be given to non-kernel-ram areas as well, these contain the PCI
- * mmio resources as well as potential bios/acpi data regions.
- */
-int devmem_is_allowed(unsigned long pagenr)
-{
-        if (pagenr <= 256)
-                return 1;
-        if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
-                return 0;
-        if (!page_is_ram(pagenr))
-                return 1;
-        return 0;
-}
-
-
 static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
                          kcore_modules, kcore_vsyscall;
 
@@ -947,43 +730,6 @@ void __init mem_init(void)
                 initsize >> 10);
 }
 
-void free_init_pages(char *what, unsigned long begin, unsigned long end)
-{
-        unsigned long addr = begin;
-
-        if (addr >= end)
-                return;
-
-        /*
-         * If debugging page accesses then do not free this memory but
-         * mark them not present - any buggy init-section access will
-         * create a kernel page fault:
-         */
-#ifdef CONFIG_DEBUG_PAGEALLOC
-        printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
-                begin, PAGE_ALIGN(end));
-        set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
-#else
-        printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
-
-        for (; addr < end; addr += PAGE_SIZE) {
-                ClearPageReserved(virt_to_page(addr));
-                init_page_count(virt_to_page(addr));
-                memset((void *)(addr & ~(PAGE_SIZE-1)),
-                        POISON_FREE_INITMEM, PAGE_SIZE);
-                free_page(addr);
-                totalram_pages++;
-        }
-#endif
-}
-
-void free_initmem(void)
-{
-        free_init_pages("unused kernel memory",
-                        (unsigned long)(&__init_begin),
-                        (unsigned long)(&__init_end));
-}
-
 #ifdef CONFIG_DEBUG_RODATA
 const int rodata_test_data = 0xC3;
 EXPORT_SYMBOL_GPL(rodata_test_data);
@@ -1049,13 +795,6 @@ void mark_rodata_ro(void)
 
 #endif
 
-#ifdef CONFIG_BLK_DEV_INITRD
-void free_initrd_mem(unsigned long start, unsigned long end)
-{
-        free_init_pages("initrd memory", start, end);
-}
-#endif
-
 int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
                                    int flags)
 {