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kext: fix outer memory cacheability on newer versions

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TuxSH 2020-05-18 20:48:54 +01:00
parent adda19ecb2
commit 19d95782e1
2 changed files with 29 additions and 4 deletions
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3
arm9/source/patches.c
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@ -114,6 +114,8 @@ u32 installK11Extension(u8 *pos, u32 size, bool needToInitSd, u32 baseK11VA, u32
void *originalHandlers[4];
u32 L1MMUTableAddrs[4];
volatile bool done;
struct CfwInfo
{
char magic[4];
@ -181,6 +183,7 @@ u32 installK11Extension(u8 *pos, u32 size, bool needToInitSd, u32 baseK11VA, u32
struct KExtParameters *p = (struct KExtParameters *)(*(u32 *)0x18000024 - K11EXT_VA + 0x18000000);
p->basePA = dstKextPA;
p->done = false;
p->stolenSystemMemRegionSize = stolenSystemMemRegionSize;
for(u32 i = 0; i < 4; i++)

30
k11_extension/source/main.c
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@ -41,6 +41,8 @@ struct KExtParameters
void *originalHandlers[4];
u32 L1MMUTableAddrs[4];
volatile bool done;
CfwInfo cfwInfo;
} kExtParameters = { .basePA = 0x12345678 }; // place this in .data
@ -60,15 +62,31 @@ void relocateAndSetupMMU(u32 coreId, u32 *L1Table)
memset((u32 *)(p0->basePA + (__bss_start__ - __start__)), 0, __bss_end__ - __bss_start__);
// Map the kernel ext at K11EXT_VA
// 4KB extended small pages: [SYS:RW USR:-- X TYP:NORMAL SHARED OUTER NOCACHE, INNER CACHED WB WA]
// 4KB extended small pages:
// Outer Write-Through cached, No Allocate on Write, Buffered
// Inner Cached Write-Back Write-Allocate, Buffered
// This was changed at some point (8.0 maybe?), it was outer noncached before
for(u32 offset = 0; offset < (u32)(__end__ - __start__); offset += 0x1000)
L2Table[offset >> 12] = (p0->basePA + offset) | 0x516;
L2Table[offset >> 12] = (p0->basePA + offset) | 0x596;
p0->done = true;
// DSB, Flush Prefetch Buffer (more or less "isb")
__asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" :: "r" (0) : "memory");
__asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" :: "r" (0) : "memory");
__asm__ __volatile__ ("sev");
}
else
__asm__ __volatile__ ("wfe");
else {
do
{
__asm__ __volatile__ ("wfe");
} while(!p0->done);
// DSB, Flush Prefetch Buffer (more or less "isb")
__asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" :: "r" (0) : "memory");
__asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" :: "r" (0) : "memory");
}
// bit31 idea thanks to SALT
// Maps physmem so that, if addr is in physmem(0, 0x30000000), it can be accessed uncached&rwx as addr|(1<<31)
u32 attribs = 0x40C02; // supersection (rwx for all) of strongly ordered memory, shared
@ -82,6 +100,10 @@ void relocateAndSetupMMU(u32 coreId, u32 *L1Table)
L1Table[K11EXT_VA >> 20] = (u32)L2Table | 1;
p->L1MMUTableAddrs[coreId] = (u32)L1Table;
// DSB, Flush Prefetch Buffer (more or less "isb")
__asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" :: "r" (0) : "memory");
__asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" :: "r" (0) : "memory");
}
void bindSGI0Hook(void)