1 files changed, 427 insertions, 96 deletions

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index ec30d10154b6..029e8cffca9e 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -50,6 +50,7 @@
 
 unsigned int __VMALLOC_RESERVE = 128 << 20;
 
+unsigned long max_low_pfn_mapped;
 unsigned long max_pfn_mapped;
 
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
@@ -57,6 +58,27 @@ unsigned long highstart_pfn, highend_pfn;
 
 static noinline int do_test_wp_bit(void);
 
+
+static unsigned long __initdata table_start;
+static unsigned long __meminitdata table_end;
+static unsigned long __meminitdata table_top;
+
+static int __initdata after_init_bootmem;
+
+static __init void *alloc_low_page(unsigned long *phys)
+{
+        unsigned long pfn = table_end++;
+        void *adr;
+
+        if (pfn >= table_top)
+                panic("alloc_low_page: ran out of memory");
+
+        adr = __va(pfn * PAGE_SIZE);
+        memset(adr, 0, PAGE_SIZE);
+        *phys  = pfn * PAGE_SIZE;
+        return adr;
+}
+
 /*
  * Creates a middle page table and puts a pointer to it in the
  * given global directory entry. This only returns the gd entry
@@ -68,9 +90,12 @@ static pmd_t * __init one_md_table_init(pgd_t *pgd)
         pmd_t *pmd_table;
 
 #ifdef CONFIG_X86_PAE
+        unsigned long phys;
         if (!(pgd_val(*pgd) & _PAGE_PRESENT)) {
-                pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE);
-
+                if (after_init_bootmem)
+                        pmd_table = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
+                else
+                        pmd_table = (pmd_t *)alloc_low_page(&phys);
                 paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
                 set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
                 pud = pud_offset(pgd, 0);
@@ -92,12 +117,16 @@ static pte_t * __init one_page_table_init(pmd_t *pmd)
         if (!(pmd_val(*pmd) & _PAGE_PRESENT)) {
                 pte_t *page_table = NULL;
 
+                if (after_init_bootmem) {
 #ifdef CONFIG_DEBUG_PAGEALLOC
-                page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
+                        page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
 #endif
-                if (!page_table) {
-                        page_table =
+                        if (!page_table)
+                                page_table =
                                 (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
+                } else {
+                        unsigned long phys;
+                        page_table = (pte_t *)alloc_low_page(&phys);
                 }
 
                 paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT);
@@ -155,38 +184,44 @@ static inline int is_kernel_text(unsigned long addr)
  * 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)
+static void __init kernel_physical_mapping_init(pgd_t *pgd_base,
+                                                unsigned long start_pfn,
+                                                unsigned long end_pfn,
+                                                int use_pse)
 {
         int pgd_idx, pmd_idx, pte_ofs;
         unsigned long pfn;
         pgd_t *pgd;
         pmd_t *pmd;
         pte_t *pte;
+        unsigned pages_2m = 0, pages_4k = 0;
 
-        pgd_idx = pgd_index(PAGE_OFFSET);
-        pgd = pgd_base + pgd_idx;
-        pfn = 0;
+        if (!cpu_has_pse)
+                use_pse = 0;
 
+        pfn = start_pfn;
+        pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
+        pgd = pgd_base + pgd_idx;
         for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
                 pmd = one_md_table_init(pgd);
-                if (pfn >= max_low_pfn)
-                        continue;
 
-                for (pmd_idx = 0;
-                     pmd_idx < PTRS_PER_PMD && pfn < max_low_pfn;
+                if (pfn >= end_pfn)
+                        continue;
+#ifdef CONFIG_X86_PAE
+                pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
+                pmd += pmd_idx;
+#else
+                pmd_idx = 0;
+#endif
+                for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn;
                      pmd++, pmd_idx++) {
                         unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET;
 
                         /*
                          * Map with big pages if possible, otherwise
                          * create normal page tables:
-                         *
-                         * Don't use a large page for the first 2/4MB of memory
-                         * because there are often fixed size MTRRs in there
-                         * and overlapping MTRRs into large pages can cause
-                         * slowdowns.
                          */
-                        if (cpu_has_pse && !(pgd_idx == 0 && pmd_idx == 0)) {
+                        if (use_pse) {
                                 unsigned int addr2;
                                 pgprot_t prot = PAGE_KERNEL_LARGE;
 
@@ -197,34 +232,30 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
                                     is_kernel_text(addr2))
                                         prot = PAGE_KERNEL_LARGE_EXEC;
 
+                                pages_2m++;
                                 set_pmd(pmd, pfn_pmd(pfn, prot));
 
                                 pfn += PTRS_PER_PTE;
-                                max_pfn_mapped = pfn;
                                 continue;
                         }
                         pte = one_page_table_init(pmd);
 
-                        for (pte_ofs = 0;
-                             pte_ofs < PTRS_PER_PTE && pfn < max_low_pfn;
+                        pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
+                        pte += pte_ofs;
+                        for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn;
                              pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) {
                                 pgprot_t prot = PAGE_KERNEL;
 
                                 if (is_kernel_text(addr))
                                         prot = PAGE_KERNEL_EXEC;
 
+                                pages_4k++;
                                 set_pte(pte, pfn_pte(pfn, prot));
                         }
-                        max_pfn_mapped = pfn;
                 }
         }
-}
-
-static inline int page_kills_ppro(unsigned long pagenr)
-{
-        if (pagenr >= 0x70000 && pagenr <= 0x7003F)
-                return 1;
-        return 0;
+        update_page_count(PG_LEVEL_2M, pages_2m);
+        update_page_count(PG_LEVEL_4K, pages_4k);
 }
 
 /*
@@ -287,29 +318,62 @@ static void __init permanent_kmaps_init(pgd_t *pgd_base)
         pkmap_page_table = pte;
 }
 
-void __init add_one_highpage_init(struct page *page, int pfn, int bad_ppro)
+static void __init add_one_highpage_init(struct page *page, int pfn)
 {
-        if (page_is_ram(pfn) && !(bad_ppro && page_kills_ppro(pfn))) {
-                ClearPageReserved(page);
-                init_page_count(page);
-                __free_page(page);
-                totalhigh_pages++;
-        } else
-                SetPageReserved(page);
+        ClearPageReserved(page);
+        init_page_count(page);
+        __free_page(page);
+        totalhigh_pages++;
 }
 
-#ifndef CONFIG_NUMA
-static void __init set_highmem_pages_init(int bad_ppro)
+struct add_highpages_data {
+        unsigned long start_pfn;
+        unsigned long end_pfn;
+};
+
+static int __init add_highpages_work_fn(unsigned long start_pfn,
+                                         unsigned long end_pfn, void *datax)
 {
-        int pfn;
+        int node_pfn;
+        struct page *page;
+        unsigned long final_start_pfn, final_end_pfn;
+        struct add_highpages_data *data;
 
-        for (pfn = highstart_pfn; pfn < highend_pfn; pfn++) {
-                /*
-                 * Holes under sparsemem might not have no mem_map[]:
-                 */
-                if (pfn_valid(pfn))
-                        add_one_highpage_init(pfn_to_page(pfn), pfn, bad_ppro);
+        data = (struct add_highpages_data *)datax;
+
+        final_start_pfn = max(start_pfn, data->start_pfn);
+        final_end_pfn = min(end_pfn, data->end_pfn);
+        if (final_start_pfn >= final_end_pfn)
+                return 0;
+
+        for (node_pfn = final_start_pfn; node_pfn < final_end_pfn;
+             node_pfn++) {
+                if (!pfn_valid(node_pfn))
+                        continue;
+                page = pfn_to_page(node_pfn);
+                add_one_highpage_init(page, node_pfn);
         }
+
+        return 0;
+
+}
+
+void __init add_highpages_with_active_regions(int nid, unsigned long start_pfn,
+                                              unsigned long end_pfn)
+{
+        struct add_highpages_data data;
+
+        data.start_pfn = start_pfn;
+        data.end_pfn = end_pfn;
+
+        work_with_active_regions(nid, add_highpages_work_fn, &data);
+}
+
+#ifndef CONFIG_NUMA
+static void __init set_highmem_pages_init(void)
+{
+        add_highpages_with_active_regions(0, highstart_pfn, highend_pfn);
+
         totalram_pages += totalhigh_pages;
 }
 #endif /* !CONFIG_NUMA */
@@ -317,14 +381,9 @@ static void __init set_highmem_pages_init(int bad_ppro)
 #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)
+# define set_highmem_pages_init()       do { } while (0)
 #endif /* CONFIG_HIGHMEM */
 
-pteval_t __PAGE_KERNEL = _PAGE_KERNEL;
-EXPORT_SYMBOL(__PAGE_KERNEL);
-
-pteval_t __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC;
-
 void __init native_pagetable_setup_start(pgd_t *base)
 {
         unsigned long pfn, va;
@@ -380,27 +439,10 @@ void __init native_pagetable_setup_done(pgd_t *base)
  * be partially populated, and so it avoids stomping on any existing
  * mappings.
  */
-static void __init pagetable_init(void)
+static void __init early_ioremap_page_table_range_init(pgd_t *pgd_base)
 {
-        pgd_t *pgd_base = swapper_pg_dir;
         unsigned long vaddr, end;
 
-        paravirt_pagetable_setup_start(pgd_base);
-
-        /* 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;
-                __PAGE_KERNEL_EXEC |= _PAGE_GLOBAL;
-        }
-
-        kernel_physical_mapping_init(pgd_base);
-        remap_numa_kva();
-
         /*
          * Fixed mappings, only the page table structure has to be
          * created - mappings will be set by set_fixmap():
@@ -410,6 +452,13 @@ static void __init pagetable_init(void)
         end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
         page_table_range_init(vaddr, end, pgd_base);
         early_ioremap_reset();
+}
+
+static void __init pagetable_init(void)
+{
+        pgd_t *pgd_base = swapper_pg_dir;
+
+        paravirt_pagetable_setup_start(pgd_base);
 
         permanent_kmaps_init(pgd_base);
 
@@ -456,7 +505,7 @@ void zap_low_mappings(void)
 
 int nx_enabled;
 
-pteval_t __supported_pte_mask __read_mostly = ~_PAGE_NX;
+pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL);
 EXPORT_SYMBOL_GPL(__supported_pte_mask);
 
 #ifdef CONFIG_X86_PAE
@@ -509,27 +558,318 @@ static void __init set_nx(void)
 }
 #endif
 
+/* user-defined highmem size */
+static unsigned int highmem_pages = -1;
+
 /*
- * paging_init() sets up the page tables - note that the first 8MB are
- * already mapped by head.S.
- *
- * This routines also unmaps the page at virtual kernel address 0, so
- * that we can trap those pesky NULL-reference errors in the kernel.
+ * highmem=size forces highmem to be exactly 'size' bytes.
+ * This works even on boxes that have no highmem otherwise.
+ * This also works to reduce highmem size on bigger boxes.
  */
-void __init paging_init(void)
+static int __init parse_highmem(char *arg)
+{
+        if (!arg)
+                return -EINVAL;
+
+        highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
+        return 0;
+}
+early_param("highmem", parse_highmem);
+
+/*
+ * Determine low and high memory ranges:
+ */
+void __init find_low_pfn_range(void)
 {
+        /* it could update max_pfn */
+
+        /* max_low_pfn is 0, we already have early_res support */
+
+        max_low_pfn = max_pfn;
+        if (max_low_pfn > MAXMEM_PFN) {
+                if (highmem_pages == -1)
+                        highmem_pages = max_pfn - MAXMEM_PFN;
+                if (highmem_pages + MAXMEM_PFN < max_pfn)
+                        max_pfn = MAXMEM_PFN + highmem_pages;
+                if (highmem_pages + MAXMEM_PFN > max_pfn) {
+                        printk(KERN_WARNING "only %luMB highmem pages "
+                                "available, ignoring highmem size of %uMB.\n",
+                                pages_to_mb(max_pfn - MAXMEM_PFN),
+                                pages_to_mb(highmem_pages));
+                        highmem_pages = 0;
+                }
+                max_low_pfn = MAXMEM_PFN;
+#ifndef CONFIG_HIGHMEM
+                /* Maximum memory usable is what is directly addressable */
+                printk(KERN_WARNING "Warning only %ldMB will be used.\n",
+                                        MAXMEM>>20);
+                if (max_pfn > MAX_NONPAE_PFN)
+                        printk(KERN_WARNING
+                                 "Use a HIGHMEM64G enabled kernel.\n");
+                else
+                        printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
+                max_pfn = MAXMEM_PFN;
+#else /* !CONFIG_HIGHMEM */
+#ifndef CONFIG_HIGHMEM64G
+                if (max_pfn > MAX_NONPAE_PFN) {
+                        max_pfn = MAX_NONPAE_PFN;
+                        printk(KERN_WARNING "Warning only 4GB will be used."
+                                "Use a HIGHMEM64G enabled kernel.\n");
+                }
+#endif /* !CONFIG_HIGHMEM64G */
+#endif /* !CONFIG_HIGHMEM */
+        } else {
+                if (highmem_pages == -1)
+                        highmem_pages = 0;
+#ifdef CONFIG_HIGHMEM
+                if (highmem_pages >= max_pfn) {
+                        printk(KERN_ERR "highmem size specified (%uMB) is "
+                                "bigger than pages available (%luMB)!.\n",
+                                pages_to_mb(highmem_pages),
+                                pages_to_mb(max_pfn));
+                        highmem_pages = 0;
+                }
+                if (highmem_pages) {
+                        if (max_low_pfn - highmem_pages <
+                            64*1024*1024/PAGE_SIZE){
+                                printk(KERN_ERR "highmem size %uMB results in "
+                                "smaller than 64MB lowmem, ignoring it.\n"
+                                        , pages_to_mb(highmem_pages));
+                                highmem_pages = 0;
+                        }
+                        max_low_pfn -= highmem_pages;
+                }
+#else
+                if (highmem_pages)
+                        printk(KERN_ERR "ignoring highmem size on non-highmem"
+                                        " kernel!\n");
+#endif
+        }
+}
+
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+void __init initmem_init(unsigned long start_pfn,
+                                  unsigned long end_pfn)
+{
+#ifdef CONFIG_HIGHMEM
+        highstart_pfn = highend_pfn = max_pfn;
+        if (max_pfn > max_low_pfn)
+                highstart_pfn = max_low_pfn;
+        memory_present(0, 0, highend_pfn);
+        e820_register_active_regions(0, 0, highend_pfn);
+        printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
+                pages_to_mb(highend_pfn - highstart_pfn));
+        num_physpages = highend_pfn;
+        high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
+#else
+        memory_present(0, 0, max_low_pfn);
+        e820_register_active_regions(0, 0, max_low_pfn);
+        num_physpages = max_low_pfn;
+        high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
+#endif
+#ifdef CONFIG_FLATMEM
+        max_mapnr = num_physpages;
+#endif
+        printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
+                        pages_to_mb(max_low_pfn));
+
+        setup_bootmem_allocator();
+}
+#endif /* !CONFIG_NEED_MULTIPLE_NODES */
+
+static void __init zone_sizes_init(void)
+{
+        unsigned long max_zone_pfns[MAX_NR_ZONES];
+        memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
+        max_zone_pfns[ZONE_DMA] =
+                virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
+        max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+#ifdef CONFIG_HIGHMEM
+        max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
+#endif
+
+        free_area_init_nodes(max_zone_pfns);
+}
+
+void __init setup_bootmem_allocator(void)
+{
+        int i;
+        unsigned long bootmap_size, bootmap;
+        /*
+         * Initialize the boot-time allocator (with low memory only):
+         */
+        bootmap_size = bootmem_bootmap_pages(max_low_pfn)<<PAGE_SHIFT;
+        bootmap = find_e820_area(min_low_pfn<<PAGE_SHIFT,
+                                 max_pfn_mapped<<PAGE_SHIFT, bootmap_size,
+                                 PAGE_SIZE);
+        if (bootmap == -1L)
+                panic("Cannot find bootmem map of size %ld\n", bootmap_size);
+        reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP");
+
+        /* don't touch min_low_pfn */
+        bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT,
+                                         min_low_pfn, max_low_pfn);
+        printk(KERN_INFO "  mapped low ram: 0 - %08lx\n",
+                 max_pfn_mapped<<PAGE_SHIFT);
+        printk(KERN_INFO "  low ram: %08lx - %08lx\n",
+                 min_low_pfn<<PAGE_SHIFT, max_low_pfn<<PAGE_SHIFT);
+        printk(KERN_INFO "  bootmap %08lx - %08lx\n",
+                 bootmap, bootmap + bootmap_size);
+        for_each_online_node(i)
+                free_bootmem_with_active_regions(i, max_low_pfn);
+        early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
+
+        after_init_bootmem = 1;
+}
+
+static void __init find_early_table_space(unsigned long end)
+{
+        unsigned long puds, pmds, ptes, tables, start;
+
+        puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
+        tables = PAGE_ALIGN(puds * sizeof(pud_t));
+
+        pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
+        tables += PAGE_ALIGN(pmds * sizeof(pmd_t));
+
+        if (cpu_has_pse) {
+                unsigned long extra;
+
+                extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
+                extra += PMD_SIZE;
+                ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
+        } else
+                ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
+
+        tables += PAGE_ALIGN(ptes * sizeof(pte_t));
+
+        /* for fixmap */
+        tables += PAGE_SIZE * 2;
+
+        /*
+         * 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 = 0x7000;
+        table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT,
+                                        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_start << PAGE_SHIFT) + tables);
+}
+
+unsigned long __init_refok init_memory_mapping(unsigned long start,
+                                                unsigned long end)
+{
+        pgd_t *pgd_base = swapper_pg_dir;
+        unsigned long start_pfn, end_pfn;
+        unsigned long big_page_start;
+
+        /*
+         * Find space for the kernel direct mapping tables.
+         */
+        if (!after_init_bootmem)
+                find_early_table_space(end);
+
 #ifdef CONFIG_X86_PAE
         set_nx();
         if (nx_enabled)
                 printk(KERN_INFO "NX (Execute Disable) protection: active\n");
 #endif
-        pagetable_init();
+
+        /* 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);
+                __supported_pte_mask |= _PAGE_GLOBAL;
+        }
+
+        /*
+         * Don't use a large page for the first 2/4MB of memory
+         * because there are often fixed size MTRRs in there
+         * and overlapping MTRRs into large pages can cause
+         * slowdowns.
+         */
+        big_page_start = PMD_SIZE;
+
+        if (start < big_page_start) {
+                start_pfn = start >> PAGE_SHIFT;
+                end_pfn = min(big_page_start>>PAGE_SHIFT, end>>PAGE_SHIFT);
+        } else {
+                /* head is not big page alignment ? */
+                start_pfn = start >> PAGE_SHIFT;
+                end_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)
+                                 << (PMD_SHIFT - PAGE_SHIFT);
+        }
+        if (start_pfn < end_pfn)
+                kernel_physical_mapping_init(pgd_base, start_pfn, end_pfn, 0);
+
+        /* big page range */
+        start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)
+                         << (PMD_SHIFT - PAGE_SHIFT);
+        if (start_pfn < (big_page_start >> PAGE_SHIFT))
+                start_pfn =  big_page_start >> PAGE_SHIFT;
+        end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
+        if (start_pfn < end_pfn)
+                kernel_physical_mapping_init(pgd_base, start_pfn, end_pfn,
+                                                cpu_has_pse);
+
+        /* tail is not big page alignment ? */
+        start_pfn = end_pfn;
+        if (start_pfn > (big_page_start>>PAGE_SHIFT)) {
+                end_pfn = end >> PAGE_SHIFT;
+                if (start_pfn < end_pfn)
+                        kernel_physical_mapping_init(pgd_base, start_pfn,
+                                                         end_pfn, 0);
+        }
+
+        early_ioremap_page_table_range_init(pgd_base);
 
         load_cr3(swapper_pg_dir);
 
         __flush_tlb_all();
 
+        if (!after_init_bootmem)
+                reserve_early(table_start << PAGE_SHIFT,
+                                 table_end << PAGE_SHIFT, "PGTABLE");
+
+        return end >> PAGE_SHIFT;
+}
+
+
+/*
+ * paging_init() sets up the page tables - note that the first 8MB are
+ * already mapped by head.S.
+ *
+ * This routines also unmaps the page at virtual kernel address 0, so
+ * that we can trap those pesky NULL-reference errors in the kernel.
+ */
+void __init paging_init(void)
+{
+        pagetable_init();
+
+        __flush_tlb_all();
+
         kmap_init();
+
+        /*
+         * NOTE: at this point the bootmem allocator is fully available.
+         */
+        sparse_init();
+        zone_sizes_init();
+
+        paravirt_post_allocator_init();
 }
 
 /*
@@ -564,24 +904,11 @@ static struct kcore_list kcore_mem, kcore_vmalloc;
 void __init mem_init(void)
 {
         int codesize, reservedpages, datasize, initsize;
-        int tmp, bad_ppro;
+        int tmp;
 
 #ifdef CONFIG_FLATMEM
         BUG_ON(!mem_map);
 #endif
-        bad_ppro = ppro_with_ram_bug();
-
-#ifdef CONFIG_HIGHMEM
-        /* check that fixmap and pkmap do not overlap */
-        if (PKMAP_BASE + LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
-                printk(KERN_ERR
-                        "fixmap and kmap areas overlap - this will crash\n");
-                printk(KERN_ERR "pkstart: %lxh pkend: %lxh fixstart %lxh\n",
-                                PKMAP_BASE, PKMAP_BASE + LAST_PKMAP*PAGE_SIZE,
-                                FIXADDR_START);
-                BUG();
-        }
-#endif
         /* this will put all low memory onto the freelists */
         totalram_pages += free_all_bootmem();
 
@@ -593,7 +920,7 @@ void __init mem_init(void)
                 if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp)))
                         reservedpages++;
 
-        set_highmem_pages_init(bad_ppro);
+        set_highmem_pages_init();
 
         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
@@ -614,7 +941,6 @@ void __init mem_init(void)
                 (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))
                );
 
-#if 1 /* double-sanity-check paranoia */
         printk(KERN_INFO "virtual kernel memory layout:\n"
                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 #ifdef CONFIG_HIGHMEM
@@ -655,7 +981,6 @@ void __init mem_init(void)
 #endif
         BUG_ON(VMALLOC_START                            > VMALLOC_END);
         BUG_ON((unsigned long)high_memory               > VMALLOC_START);
-#endif /* double-sanity-check paranoia */
 
         if (boot_cpu_data.wp_works_ok < 0)
                 test_wp_bit();
@@ -784,3 +1109,9 @@ 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)
+{
+        return reserve_bootmem(phys, len, flags);
+}