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Merge pull request #9625 from leoetlino/mmu-sdr-update 

MMU: Fix SDR updates being silently dropped in some cases
This commit is contained in:
JMC47 2021-04-06 20:23:13 -04:00 committed by GitHub
parent 3b6fdb74f6 49edd5f482
commit 5322256065
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 11 additions and 9 deletions
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20
Source/Core/Core/PowerPC/MMU.cpp
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@ -980,14 +980,16 @@ void SDRUpdated()
{
u32 htabmask = SDR1_HTABMASK(PowerPC::ppcState.spr[SPR_SDR]);
if (!Common::IsValidLowMask(htabmask))
{
return;
}
WARN_LOG_FMT(POWERPC, "Invalid HTABMASK: 0b{:032b}", htabmask);
// While 6xx_pem.pdf §7.6.1.1 mentions that the number of trailing zeros in HTABORG
// must be equal to the number of trailing ones in the mask (i.e. HTABORG must be
// properly aligned), this is actually not a hard requirement. Real hardware will just OR
// the base address anyway. Ignoring SDR changes would lead to incorrect emulation.
u32 htaborg = SDR1_HTABORG(PowerPC::ppcState.spr[SPR_SDR]);
if (htaborg & htabmask)
{
return;
}
WARN_LOG_FMT(POWERPC, "Invalid HTABORG: htaborg=0x{:08x} htabmask=0x{:08x}", htaborg, htabmask);
PowerPC::ppcState.pagetable_base = htaborg << 16;
PowerPC::ppcState.pagetable_hashmask = ((htabmask << 10) | 0x3ff);
}
@ -1111,7 +1113,7 @@ static TranslateAddressResult TranslatePageAddress(const u32 address, const XChe
// hash function no 1 "xor" .360
u32 hash = (VSID ^ page_index);
u32 pte1 = Common::swap32((VSID << 7) | api | PTE1_V);
u32 pte1 = (VSID << 7) | api | PTE1_V;
for (int hash_func = 0; hash_func < 2; hash_func++)
{
@ -1119,7 +1121,7 @@ static TranslateAddressResult TranslatePageAddress(const u32 address, const XChe
if (hash_func == 1)
{
hash = ~hash;
pte1 |= PTE1_H << 24;
pte1 |= PTE1_H;
}
u32 pteg_addr =
@ -1127,7 +1129,7 @@ static TranslateAddressResult TranslatePageAddress(const u32 address, const XChe
for (int i = 0; i < 8; i++, pteg_addr += 8)
{
u32 pteg = Common::swap32(Memory::Read_U32(pteg_addr));
const u32 pteg = Memory::Read_U32(pteg_addr);
if (pte1 == pteg)
{