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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2006-09-27 10:00:54 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-09-27 10:10:58 +0100
commit456335e2072fb35bf290b45e61d51916c322c145 (patch)
tree985fddceeeff3e3a8cbbff33a8130fc31637ec8d /arch
parentc06015148fa9a3cc452ec7121b8c3f59f4a7d6ac (diff)
downloadop-kernel-dev-456335e2072fb35bf290b45e61d51916c322c145.zip
op-kernel-dev-456335e2072fb35bf290b45e61d51916c322c145.tar.gz
[ARM] Separate page table manipulation code from bootmem initialisation
nommu does not require the page table manipulation code in the bootmem initialisation paths. Move this into separate inline functions. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mm/init.c73
1 files changed, 44 insertions, 29 deletions
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 64262bd..83145d1 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -226,6 +226,44 @@ static __init void reserve_node_zero(pg_data_t *pgdat)
reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
}
+static inline void prepare_page_table(struct meminfo *mi)
+{
+ unsigned long addr;
+
+ /*
+ * Clear out all the mappings below the kernel image.
+ */
+ for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
+ pmd_clear(pmd_off_k(addr));
+
+#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;
+#endif
+ for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
+ pmd_clear(pmd_off_k(addr));
+
+ /*
+ * Clear out all the kernel space mappings, except for the first
+ * memory bank, up to the end of the vmalloc region.
+ */
+ for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size);
+ addr < VMALLOC_END; addr += PGDIR_SIZE)
+ pmd_clear(pmd_off_k(addr));
+}
+
+static inline void map_memory_bank(struct membank *bank)
+{
+ struct map_desc map;
+
+ map.pfn = __phys_to_pfn(bank->start);
+ map.virtual = __phys_to_virt(bank->start);
+ map.length = bank->size;
+ map.type = MT_MEMORY;
+
+ create_mapping(&map);
+}
+
static unsigned long __init
bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
{
@@ -242,23 +280,18 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
* Calculate the pfn range, and map the memory banks for this node.
*/
for_each_nodebank(i, mi, node) {
+ struct membank *bank = &mi->bank[i];
unsigned long start, end;
- struct map_desc map;
- start = mi->bank[i].start >> PAGE_SHIFT;
- end = (mi->bank[i].start + mi->bank[i].size) >> PAGE_SHIFT;
+ start = bank->start >> PAGE_SHIFT;
+ end = (bank->start + bank->size) >> PAGE_SHIFT;
if (start_pfn > start)
start_pfn = start;
if (end_pfn < end)
end_pfn = end;
- map.pfn = __phys_to_pfn(mi->bank[i].start);
- map.virtual = __phys_to_virt(mi->bank[i].start);
- map.length = mi->bank[i].size;
- map.type = MT_MEMORY;
-
- create_mapping(&map);
+ map_memory_bank(bank);
}
/*
@@ -342,7 +375,7 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
static void __init bootmem_init(struct meminfo *mi)
{
- unsigned long addr, memend_pfn = 0;
+ unsigned long memend_pfn = 0;
int node, initrd_node, i;
/*
@@ -354,25 +387,7 @@ static void __init bootmem_init(struct meminfo *mi)
memcpy(&meminfo, mi, sizeof(meminfo));
- /*
- * Clear out all the mappings below the kernel image.
- */
- for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
- pmd_clear(pmd_off_k(addr));
-#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;
-#endif
- for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
- pmd_clear(pmd_off_k(addr));
-
- /*
- * Clear out all the kernel space mappings, except for the first
- * memory bank, up to the end of the vmalloc region.
- */
- for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size);
- addr < VMALLOC_END; addr += PGDIR_SIZE)
- pmd_clear(pmd_off_k(addr));
+ prepare_page_table(mi);
/*
* Locate which node contains the ramdisk image, if any.
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