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Use PAE only when there's memory beyond the 4G limit.

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git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37115 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold
2010-06-12 15:11:53 +00:00
parent b14ae02b95
commit 61d2b06c40
1 changed files with 20 additions and 4 deletions
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src/system/kernel/arch/x86/arch_vm_translation_map.cpp
+20 -4
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@@ -73,12 +73,28 @@ arch_vm_translation_map_init(kernel_args *args,
#endif #endif
#if B_HAIKU_PHYSICAL_BITS == 64 #if B_HAIKU_PHYSICAL_BITS == 64
if (x86_check_feature(IA32_FEATURE_PAE, FEATURE_COMMON) bool paeAvailable = x86_check_feature(IA32_FEATURE_PAE, FEATURE_COMMON);
/* TODO: && if needed */) { bool paeNeeded = false;
for (uint32 i = 0; i < args->num_physical_memory_ranges; i++) {
phys_addr_t end = args->physical_memory_range[i].start
+ args->physical_memory_range[i].size;
if (end > 0x100000000LL) {
paeNeeded = true;
break;
}
}
if (paeAvailable && paeNeeded) {
dprintf("using PAE paging\n");
gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethodPAE; gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethodPAE;
} else } else {
#endif dprintf("using 32 bit paging (PAE not %s)\n",
paeNeeded ? "available" : "needed");
gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethod32Bit; gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethod32Bit;
}
#else
gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethod32Bit;
#endif
return gX86PagingMethod->Init(args, _physicalPageMapper); return gX86PagingMethod->Init(args, _physicalPageMapper);
} }