Merge branch 'docs-next' of git://git.lwn.net/linux-2.6

[pandora-kernel.git] / arch / arm / mm / mmu.c

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 4223d08..2858941 100644 (file)
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -14,6 +14,7 @@
 #include <linux/bootmem.h>
 #include <linux/mman.h>
 #include <linux/nodemask.h>
+#include <linux/sort.h>
 
 #include <asm/cputype.h>
 #include <asm/mach-types.h>
@@ -603,7 +604,7 @@ static void __init create_36bit_mapping(struct map_desc *md,
  * offsets, and we take full advantage of sections and
  * supersections.
  */
-void __init create_mapping(struct map_desc *md)
+static void __init create_mapping(struct map_desc *md)
 {
        unsigned long phys, addr, length, end;
        const struct mem_type *type;
@@ -869,9 +870,10 @@ void __init reserve_node_zero(pg_data_t *pgdat)
        if (machine_is_p720t())
                res_size = 0x00014000;
 
-       /* H1940 and RX3715 need to reserve this for suspend */
+       /* H1940, RX3715 and RX1950 need to reserve this for suspend */
 
-       if (machine_is_h1940() || machine_is_rx3715()) {
+       if (machine_is_h1940() || machine_is_rx3715()
+               || machine_is_rx1950()) {
                reserve_bootmem_node(pgdat, 0x30003000, 0x1000,
                                BOOTMEM_DEFAULT);
                reserve_bootmem_node(pgdat, 0x30081000, 0x1000,
@@ -1017,6 +1019,39 @@ static void __init kmap_init(void)
 #endif
 }
 
+static inline void map_memory_bank(struct membank *bank)
+{
+       struct map_desc map;
+
+       map.pfn = bank_pfn_start(bank);
+       map.virtual = __phys_to_virt(bank_phys_start(bank));
+       map.length = bank_phys_size(bank);
+       map.type = MT_MEMORY;
+
+       create_mapping(&map);
+}
+
+static void __init map_lowmem(void)
+{
+       struct meminfo *mi = &meminfo;
+       int i;
+
+       /* Map all the lowmem memory banks. */
+       for (i = 0; i < mi->nr_banks; i++) {
+               struct membank *bank = &mi->bank[i];
+
+               if (!bank->highmem)
+                       map_memory_bank(bank);
+       }
+}
+
+static int __init meminfo_cmp(const void *_a, const void *_b)
+{
+       const struct membank *a = _a, *b = _b;
+       long cmp = bank_pfn_start(a) - bank_pfn_start(b);
+       return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
+}
+
 /*
  * paging_init() sets up the page tables, initialises the zone memory
  * maps, and sets up the zero page, bad page and bad page tables.
@@ -1025,9 +1060,12 @@ void __init paging_init(struct machine_desc *mdesc)
 {
        void *zero_page;
 
+       sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
+
        build_mem_type_table();
        sanity_check_meminfo();
        prepare_page_table();
+       map_lowmem();
        bootmem_init();
        devicemaps_init(mdesc);
        kmap_init();
@@ -1054,10 +1092,12 @@ void setup_mm_for_reboot(char mode)
        pgd_t *pgd;
        int i;
 
-       if (current->mm && current->mm->pgd)
-               pgd = current->mm->pgd;
-       else
-               pgd = init_mm.pgd;
+       /*
+        * We need to access to user-mode page tables here. For kernel threads
+        * we don't have any user-mode mappings so we use the context that we
+        * "borrowed".
+        */
+       pgd = current->active_mm->pgd;
 
        base_pmdval = PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | PMD_TYPE_SECT;
        if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())