x86: move init_memory_mapping() to common mm/init.c

Impact: cleanup

This patch moves the init_memory_mapping() function to common mm/init.c.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1236257708-27269-14-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 7 insertions, 301 deletions

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index cd3c24b490a1..187522a0c66b 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -59,13 +59,9 @@ 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;
-
-int after_bootmem;
-
-int direct_gbpages;
+extern unsigned long __initdata table_start;
+extern unsigned long __meminitdata table_end;
+extern unsigned long __meminitdata table_top;
 
 static __init void *alloc_low_page(void)
 {
@@ -227,9 +223,9 @@ 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(unsigned long start_pfn,
-                                                unsigned long end_pfn,
-                                                int use_pse)
+void __init kernel_physical_mapping_init(unsigned long start_pfn,
+                                         unsigned long end_pfn,
+                                         int use_pse)
 {
         pgd_t *pgd_base = swapper_pg_dir;
         int pgd_idx, pmd_idx, pte_ofs;
@@ -509,7 +505,7 @@ void __init native_pagetable_setup_done(pgd_t *base)
  * be partially populated, and so it avoids stomping on any existing
  * mappings.
  */
-static void __init early_ioremap_page_table_range_init(void)
+void __init early_ioremap_page_table_range_init(void)
 {
         pgd_t *pgd_base = swapper_pg_dir;
         unsigned long vaddr, end;
@@ -834,296 +830,6 @@ void __init setup_bootmem_allocator(void)
         after_bootmem = 1;
 }
 
-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);
-#ifdef CONFIG_X86_32
-                extra += PMD_SIZE;
-#endif
-                ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
-        } else
-                ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
-
-        tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE);
-
-#ifdef CONFIG_X86_32
-        /* for fixmap */
-        tables += roundup(__end_of_fixed_addresses * sizeof(pte_t), PAGE_SIZE);
-#endif
-
-        /*
-         * 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.
-         */
-#ifdef CONFIG_X86_32
-        start = 0x7000;
-        table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT,
-                                        tables, PAGE_SIZE);
-#else /* CONFIG_X86_64 */
-        start = 0x8000;
-        table_start = find_e820_area(start, end, tables, PAGE_SIZE);
-#endif
-        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);
-}
-
-struct map_range {
-        unsigned long start;
-        unsigned long end;
-        unsigned page_size_mask;
-};
-
-#ifdef CONFIG_X86_32
-#define NR_RANGE_MR 3
-#else /* CONFIG_X86_64 */
-#define NR_RANGE_MR 5
-#endif
-
-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;
-}
-
-static inline void init_gbpages(void)
-{
-}
-
-/*
- * 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 page_size_mask = 0;
-        unsigned long start_pfn, end_pfn;
-        unsigned long pos;
-        unsigned long ret;
-
-        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);
-
-        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
-
-#ifdef CONFIG_X86_32
-#ifdef CONFIG_X86_PAE
-        set_nx();
-        if (nx_enabled)
-                printk(KERN_INFO "NX (Execute Disable) protection: active\n");
-#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);
-                __supported_pte_mask |= _PAGE_GLOBAL;
-        }
-#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;
-#ifdef CONFIG_X86_32
-        /*
-         * 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 (pos == 0)
-                end_pfn = 1<<(PMD_SHIFT - PAGE_SHIFT);
-        else
-                end_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT)
-                                 << (PMD_SHIFT - PAGE_SHIFT);
-#else /* CONFIG_X86_64 */
-        end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT)
-                        << (PMD_SHIFT - PAGE_SHIFT);
-#endif
-        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);
-#ifdef CONFIG_X86_32
-        end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
-#else /* CONFIG_X86_64 */
-        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));
-#endif
-
-        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;
-        }
-
-#ifdef CONFIG_X86_64
-        /* 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;
-        }
-#endif
-
-        /* 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"));
-
-        /*
-         * 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)
-                find_early_table_space(end, use_pse, use_gbpages);
-
-#ifdef CONFIG_X86_32
-        for (i = 0; i < nr_range; i++)
-                kernel_physical_mapping_init(
-                                mr[i].start >> PAGE_SHIFT,
-                                mr[i].end >> PAGE_SHIFT,
-                                mr[i].page_size_mask == (1<<PG_LEVEL_2M));
-        ret = end;
-#else /* CONFIG_X86_64 */
-        for (i = 0; i < nr_range; i++)
-                ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
-                                                   mr[i].page_size_mask);
-#endif
-
-#ifdef CONFIG_X86_32
-        early_ioremap_page_table_range_init();
-
-        load_cr3(swapper_pg_dir);
-#endif
-
-#ifdef CONFIG_X86_64
-        if (!after_bootmem)
-                mmu_cr4_features = read_cr4();
-#endif
-        __flush_tlb_all();
-
-        if (!after_bootmem && table_end > table_start)
-                reserve_early(table_start << PAGE_SHIFT,
-                                 table_end << PAGE_SHIFT, "PGTABLE");
-
-        if (!after_bootmem)
-                early_memtest(start, end);
-
-        return ret >> PAGE_SHIFT;
-}
-
-
 /*
  * paging_init() sets up the page tables - note that the first 8MB are
  * already mapped by head.S.