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authorJohannes Weiner <jw@emlix.com>2009-03-04 16:21:30 +0100
committerChris Zankel <chris@zankel.net>2009-04-02 23:41:08 -0700
commitc947a585ab13f310c9223284dfd502790abd05f9 (patch)
tree1295ce0f825139326eb3d894eaddcf8027953e96 /arch/xtensa/mm
parent264da9f708b130122d881fa4570d1cd618440a73 (diff)
downloadlinux-c947a585ab13f310c9223284dfd502790abd05f9.tar.gz
xtensa: cope with ram beginning at higher addresses
The current assumption of the memory code is that the first RAM PFN in the system is 0. Adjust the relevant code to play well with setups where memory starts at higher addresses, indicated by PLATFORM_DEFAULT_MEM_START. The new memory model looks like this: +----------+--+----------------------+----------------+ | | | | | | | | RAM | | | | | | | +----------+--+----------------------+----------------+ | | | | | +- PFN 0 | +- min_low_pfn +- max_low_pfn +- max_pfn | +- ARCH_PFN_OFFSET +- PLATFORM_DEFAULT_MEM_START >> PAGE_SIZE The memory map contains pages starting from pfn ARCH_PFN_OFFSET up to max_low_pfn. The only zone used right now will span exactly the same region. Usually, ARCH_PFN_OFFSET and min_low_pfn are the same value. Handle them separately for robustness. Gapping pages will be in the memory map but marked as reserved and won't be touched. Signed-off-by: Johannes Weiner <jw@emlix.com> Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch/xtensa/mm')
-rw-r--r--arch/xtensa/mm/init.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index a534d52a57b..6190988bba1 100644
--- a/arch/xtensa/mm/init.c
+++ b/arch/xtensa/mm/init.c
@@ -167,7 +167,7 @@ void __init paging_init(void)
/* All pages are DMA-able, so we put them all in the DMA zone. */
- zones_size[ZONE_DMA] = max_low_pfn;
+ zones_size[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET;
for (i = 1; i < MAX_NR_ZONES; i++)
zones_size[i] = 0;
@@ -179,7 +179,7 @@ void __init paging_init(void)
memset(swapper_pg_dir, 0, PAGE_SIZE);
- free_area_init(zones_size);
+ free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
}
/*
@@ -220,8 +220,8 @@ void __init mem_init(void)
unsigned long codesize, reservedpages, datasize, initsize;
unsigned long highmemsize, tmp, ram;
- max_mapnr = num_physpages = max_low_pfn;
- high_memory = (void *) __va(max_mapnr << PAGE_SHIFT);
+ max_mapnr = num_physpages = max_low_pfn - ARCH_PFN_OFFSET;
+ high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
highmemsize = 0;
#ifdef CONFIG_HIGHMEM
@@ -231,7 +231,7 @@ void __init mem_init(void)
totalram_pages += free_all_bootmem();
reservedpages = ram = 0;
- for (tmp = 0; tmp < max_low_pfn; tmp++) {
+ for (tmp = 0; tmp < max_mapnr; tmp++) {
ram++;
if (PageReserved(mem_map+tmp))
reservedpages++;