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#include "dolphin/os/OSMemory.h"
#include "dolphin/os/OS.h"
#define TRUNC(n, a) (((u32)(n)) & ~((a)-1))
#define ROUND(n, a) (((u32)(n) + (a)-1) & ~((a)-1))
vu16 __MEMRegs[64] AT_ADDRESS(0xCC004000);
extern OSErrorHandler __OSErrorTable[EXCEPTION_MAX];
u32 OSGetConsoleSimulatedMemSize() {
return *(u32*)(OSPhysicalToCached(0x00F0));
}
static BOOL OnReset(BOOL final) {
if (final != FALSE) {
__MEMRegs[8] = 0xFF;
__OSMaskInterrupts(OS_INTERRUPTMASK_MEM_RESET);
}
return TRUE;
}
static void MEMIntrruptHandler(__OSInterrupt interrupt, OSContext* context) {
u32 addr;
u32 cause;
cause = __MEMRegs[0xf];
addr = (((u32)__MEMRegs[0x12] & 0x3ff) << 16) | __MEMRegs[0x11];
__MEMRegs[0x10] = 0;
if (__OSErrorTable[EXCEPTION_MEMORY_PROTECTION]) {
__OSErrorTable[EXCEPTION_MEMORY_PROTECTION](EXCEPTION_MEMORY_PROTECTION, context, cause,
addr);
return;
}
__OSUnhandledException(EXCEPTION_MEMORY_PROTECTION, context, cause, addr);
}
void OSProtectRange(u32 chan, void* addr, u32 nBytes, u32 control) {
BOOL enabled;
u32 start;
u32 end;
u16 reg;
if (4 <= chan) {
return;
}
control &= OS_PROTECT_CONTROL_RDWR;
end = (u32)addr + nBytes;
start = TRUNC(addr, 1u << 10);
end = ROUND(end, 1u << 10);
DCFlushRange((void*)start, end - start);
enabled = OSDisableInterrupts();
__OSMaskInterrupts(OS_INTERRUPTMASK(OS_INTR_MEM_0 + chan));
__MEMRegs[0 + 2 * chan] = (u16)(start >> 10);
__MEMRegs[1 + 2 * chan] = (u16)(end >> 10);
reg = __MEMRegs[8];
reg &= ~(OS_PROTECT_CONTROL_RDWR << 2 * chan);
reg |= control << 2 * chan;
__MEMRegs[8] = reg;
if (control != OS_PROTECT_CONTROL_RDWR) {
__OSUnmaskInterrupts(OS_INTERRUPTMASK(OS_INTR_MEM_0 + chan));
}
OSRestoreInterrupts(enabled);
}
static ASM void Config24MB(void) {
// clang-format off
#ifdef __MWERKS__
nofralloc
li r7, 0
lis r4, 0x0000
addi r4, r4, 0x0002
lis r3, 0x8000
addi r3, r3, 0x01FF
lis r6, 0x0100
addi r6, r6, 0x0002
lis r5, 0x8100
addi r5, r5, 0x00FF
isync
mtdbatu 0, r7
mtdbatl 0, r4
mtdbatu 0, r3
isync
mtibatu 0, r7
mtibatl 0, r4
mtibatu 0, r3
isync
mtdbatu 2, r7
mtdbatl 2, r6
mtdbatu 2, r5
isync
mtibatu 2, r7
mtibatl 2, r6
mtibatu 2, r5
isync
mfmsr r3
ori r3, r3, 0x30
mtspr 0x1b, r3
mflr r3
mtspr 0x1a, r3
rfi
#endif
// clang-format on
}
static ASM void Config48MB(void) {
// clang-format off
#ifdef __MWERKS__
nofralloc
li r7, 0
lis r4, 0x0000
addi r4, r4, 0x0002
lis r3, 0x8000
addi r3, r3, 0x03FF
lis r6, 0x0200
addi r6, r6, 0x0002
lis r5, 0x8200
addi r5, r5, 0x01FF
isync
mtdbatu 0, r7
mtdbatl 0, r4
mtdbatu 0, r3
isync
mtibatu 0, r7
mtibatl 0, r4
mtibatu 0, r3
isync
mtdbatu 2, r7
mtdbatl 2, r6
mtdbatu 2, r5
isync
mtibatu 2, r7
mtibatl 2, r6
mtibatu 2, r5
isync
mfmsr r3
ori r3, r3, 0x30
mtspr 0x1b, r3
mflr r3
mtspr 0x1a, r3
rfi
#endif
// clang-format on
}
static ASM void RealMode(register u32 config) {
// clang-format off
#ifdef __MWERKS__
nofralloc
clrlwi config, config, 2
mtspr 0x1a, config
mfmsr config
rlwinm config, config, 0, 0x1c, 0x19
mtspr 0x1b, config
rfi
#endif
// clang-format on
}
static OSResetFunctionInfo ResetFunctionInfo = {
OnReset,
0x7F,
};
inline u32 OSGetPhysicalMemSize() {
return *(u32*)(OSPhysicalToCached(0x0028));
}
void __OSInitMemoryProtection() {
u32 padding[8];
u32 simulatedSize;
BOOL enabled;
simulatedSize = OSGetConsoleSimulatedMemSize();
enabled = OSDisableInterrupts();
if (simulatedSize <= 0x1800000) {
RealMode((u32)&Config24MB);
} else if (simulatedSize <= 0x3000000) {
RealMode((u32)&Config48MB);
}
__MEMRegs[16] = 0;
__MEMRegs[8] = 0xFF;
__OSMaskInterrupts(OS_INTERRUPTMASK_MEM_0 | OS_INTERRUPTMASK_MEM_1 | OS_INTERRUPTMASK_MEM_2 |
OS_INTERRUPTMASK_MEM_3);
__OSSetInterruptHandler(OS_INTR_MEM_0, MEMIntrruptHandler);
__OSSetInterruptHandler(OS_INTR_MEM_1, MEMIntrruptHandler);
__OSSetInterruptHandler(OS_INTR_MEM_2, MEMIntrruptHandler);
__OSSetInterruptHandler(OS_INTR_MEM_3, MEMIntrruptHandler);
__OSSetInterruptHandler(OS_INTR_MEM_ADDRESS, MEMIntrruptHandler);
OSRegisterResetFunction(&ResetFunctionInfo);
if (OSGetConsoleSimulatedMemSize() < OSGetPhysicalMemSize() &&
OSGetConsoleSimulatedMemSize() == 0x1800000)
{
__MEMRegs[20] = 2;
}
__OSUnmaskInterrupts(OS_INTERRUPTMASK_MEM_ADDRESS);
OSRestoreInterrupts(enabled);
}
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