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| author |   Albert Herranz <albert_herranz@yahoo.es> | 2009-12-12 06:31:53 +0000 |
|---|---|---|
| committer |   Grant Likely <grant.likely@secretlab.ca> | 2009-12-12 22:24:31 -0700 |
| commit | de32400dd26e743c5d500aa42d8d6818b79edb73 (patch) | |
| tree | 5fee868e4fac044dca4fb3a18532b67b62c90c96 /arch/powerpc/mm/mmu_decl.h | |
| parent | wii: bootwrapper: add fixup to calc useable mem2 (diff) | |
| download | linux-dev-de32400dd26e743c5d500aa42d8d6818b79edb73.tar.xz linux-dev-de32400dd26e743c5d500aa42d8d6818b79edb73.zip | |
wii: use both mem1 and mem2 as ram
The Nintendo Wii video game console has two discontiguous RAM regions:
- MEM1: 24MB @ 0x00000000
- MEM2: 64MB @ 0x10000000
Unfortunately, the kernel currently does not support discontiguous RAM
memory regions on 32-bit PowerPC platforms.
This patch adds a series of workarounds to allow the use of the second
memory region (MEM2) as RAM by the kernel.
Basically, a single range of memory from the beginning of MEM1 to the
end of MEM2 is reported to the kernel, and a memory reservation is
created for the hole between MEM1 and MEM2.
With this patch the system is able to use all the available RAM and not
just ~27% of it.
This will no longer be needed when proper discontig memory support
for 32-bit PowerPC is added to the kernel.
Signed-off-by: Albert Herranz <albert_herranz@yahoo.es>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'arch/powerpc/mm/mmu_decl.h')
| -rw-r--r-- | arch/powerpc/mm/mmu_decl.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h index d2e5321d5ea6..9aa39fe74f8a 100644 --- a/arch/powerpc/mm/mmu_decl.h +++ b/arch/powerpc/mm/mmu_decl.h @@ -136,6 +136,14 @@ extern phys_addr_t total_lowmem; extern phys_addr_t memstart_addr; extern phys_addr_t lowmem_end_addr; +#ifdef CONFIG_WII +extern unsigned long wii_hole_start; +extern unsigned long wii_hole_size; + +extern unsigned long wii_mmu_mapin_mem2(unsigned long top); +extern void wii_memory_fixups(void); +#endif + /* ...and now those things that may be slightly different between processor * architectures. -- Dan */ @@ -155,5 +163,5 @@ extern void adjust_total_lowmem(void); #elif defined(CONFIG_PPC32) /* anything 32-bit except 4xx or 8xx */ extern void MMU_init_hw(void); -extern unsigned long mmu_mapin_ram(void); +extern unsigned long mmu_mapin_ram(unsigned long top); #endif |