LowLevel/Luma3DS-3GX
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Make FCRAM (and VRAM as a side effect) globally executable from arm11 kernel (only when "developer features" are enabled)

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This commit is contained in:
TuxSH 2016-05-08 01:23:22 +02:00
parent 8dd9c1a1af
commit 02c6a3c214
1 changed files with 18 additions and 1 deletions
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17
source/firm.c
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@ -272,9 +272,23 @@ static inline void loadFirm(u32 firmType, u32 externalFirm)
}
}
static inline void patchKernelFCRAMAndVRAMMappingPermissions(u8* arm11Section1)
{
static const u8 MMUConfigPattern[] = {
0xC4, 0xDD, 0xFA, 0x1F,
0x16, 0x64, 0x01, 0x00,
0xBC, 0xDD, 0xFA, 0x1F,
0x00, 0x50, 0xFF, 0x1F
};
u32* off = (u32 *)memsearch(arm11Section1, MMUConfigPattern, section[1].size, sizeof(MMUConfigPattern));
if(off != NULL) off[1] &= ~(1 << 4); //clear XN bit
}
static inline void patchNativeFirm(u32 nandType, u32 emuHeader, u32 a9lhMode)
{
u8 *arm9Section = (u8 *)firm + section[2].offset;
u8 *arm11Section1 = (u8 *)firm + section[1].offset;
u32 nativeFirmType;
@ -334,6 +348,9 @@ static inline void patchNativeFirm(u32 nandType, u32 emuHeader, u32 a9lhMode)
//Apply UNITINFO patch
u8 *unitInfoOffset = getUnitInfoValueSet(arm9Section, section[2].size);
*unitInfoOffset = unitInfoPatch;
//Make FCRAM (and VRAM as a side effect) globally executable from arm11 kernel
patchKernelFCRAMAndVRAMMappingPermissions(arm11Section1);
}
//Replace the FIRM loader with the injector while copying section0