[ARM] kmap support

[safe/jmp/linux-2.6] / arch / arm / mm / mmu.c

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index c0b9a78..4810a4c 100644 (file)
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -17,9 +17,11 @@
 
 #include <asm/cputype.h>
 #include <asm/mach-types.h>
+#include <asm/sections.h>
 #include <asm/setup.h>
 #include <asm/sizes.h>
 #include <asm/tlb.h>
+#include <asm/highmem.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
@@ -692,7 +694,8 @@ static void __init sanity_check_meminfo(void)
                 * Check whether this memory bank would entirely overlap
                 * the vmalloc area.
                 */
-               if (__va(bank->start) >= VMALLOC_MIN) {
+               if (__va(bank->start) >= VMALLOC_MIN ||
+                   __va(bank->start) < PAGE_OFFSET) {
                        printk(KERN_NOTICE "Ignoring RAM at %.8lx-%.8lx "
                               "(vmalloc region overlap).\n",
                               bank->start, bank->start + bank->size - 1);
@@ -730,7 +733,7 @@ static inline void prepare_page_table(void)
 
 #ifdef CONFIG_XIP_KERNEL
        /* The XIP kernel is mapped in the module area -- skip over it */
-       addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
+       addr = ((unsigned long)_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
 #endif
        for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
                pmd_clear(pmd_off_k(addr));
@@ -756,10 +759,10 @@ void __init reserve_node_zero(pg_data_t *pgdat)
         * Note that this can only be in node 0.
         */
 #ifdef CONFIG_XIP_KERNEL
-       reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start,
+       reserve_bootmem_node(pgdat, __pa(_data), _end - _data,
                        BOOTMEM_DEFAULT);
 #else
-       reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext,
+       reserve_bootmem_node(pgdat, __pa(_stext), _end - _stext,
                        BOOTMEM_DEFAULT);
 #endif
 
@@ -826,7 +829,6 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
         * Allocate the vector page early.
         */
        vectors = alloc_bootmem_low_pages(PAGE_SIZE);
-       BUG_ON(!vectors);
 
        for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE)
                pmd_clear(pmd_off_k(addr));
@@ -838,7 +840,7 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
 #ifdef CONFIG_XIP_KERNEL
        map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK);
        map.virtual = MODULES_VADDR;
-       map.length = ((unsigned long)&_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK;
+       map.length = ((unsigned long)_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK;
        map.type = MT_ROM;
        create_mapping(&map);
 #endif
@@ -894,6 +896,17 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
        flush_cache_all();
 }
 
+static void __init kmap_init(void)
+{
+#ifdef CONFIG_HIGHMEM
+       pmd_t *pmd = pmd_off_k(PKMAP_BASE);
+       pte_t *pte = alloc_bootmem_low_pages(2 * PTRS_PER_PTE * sizeof(pte_t));
+       BUG_ON(!pmd_none(*pmd) || !pte);
+       __pmd_populate(pmd, __pa(pte) | _PAGE_KERNEL_TABLE);
+       pkmap_page_table = pte + PTRS_PER_PTE;
+#endif
+}
+
 /*
  * paging_init() sets up the page tables, initialises the zone memory
  * maps, and sets up the zero page, bad page and bad page tables.
@@ -907,14 +920,15 @@ void __init paging_init(struct machine_desc *mdesc)
        prepare_page_table();
        bootmem_init();
        devicemaps_init(mdesc);
+       kmap_init();
 
        top_pmd = pmd_off_k(0xffff0000);
 
        /*
-        * allocate the zero page.  Note that we count on this going ok.
+        * allocate the zero page.  Note that this always succeeds and
+        * returns a zeroed result.
         */
        zero_page = alloc_bootmem_low_pages(PAGE_SIZE);
-       memset(zero_page, 0, PAGE_SIZE);
        empty_zero_page = virt_to_page(zero_page);
        flush_dcache_page(empty_zero_page);
 }