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authorAlbert Herranz <albert_herranz@yahoo.es>2009-12-12 06:31:53 +0000
committerGrant Likely <grant.likely@secretlab.ca>2009-12-12 22:24:31 -0700
commitde32400dd26e743c5d500aa42d8d6818b79edb73 (patch)
tree5fee868e4fac044dca4fb3a18532b67b62c90c96 /arch/powerpc/mm/mmu_decl.h
parent02d748a9ee56735641bade9b734dc2fa9be4df4c (diff)
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.h10
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