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Maybe I miss something, but I don't see the reason for the PPC

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arch_mmu_allocate() to set the "cache inhibited" flag. One negative
effect was that for such memory the lwarx instruction (used by the
atomic_*() functions) does "... cause the system data storage error
handle to be invoked...", as the architecture specification puts it.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15759 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold
2005-12-30 22:10:54 +00:00
parent 2de437fa29
commit 4c1fca768d
1 changed files with 3 additions and 3 deletions
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src/system/boot/platform/openfirmware/arch/ppc/mmu.cpp
+3 -3
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@@ -480,16 +480,16 @@ arch_mmu_allocate(void *_virtualAddress, size_t size, uint8 _protection,
// we only know page sizes // we only know page sizes
size = ROUNDUP(size, B_PAGE_SIZE); size = ROUNDUP(size, B_PAGE_SIZE);
// set protection to WIMGNPP: -I---PP // set protection to WIMGNPP: -----PP
// PP: 00 - no access // PP: 00 - no access
// 01 - read only // 01 - read only
// 10 - read/write // 10 - read/write
// 11 - read only // 11 - read only
uint8 protection = 0; uint8 protection = 0;
if (_protection & B_WRITE_AREA) if (_protection & B_WRITE_AREA)
protection = 0x22; protection = 0x02;
else else
protection = 0x21; protection = 0x01;
// find free address large enough to hold "size" // find free address large enough to hold "size"
void *virtualAddress = find_free_virtual_range(_virtualAddress, size); void *virtualAddress = find_free_virtual_range(_virtualAddress, size);