diff options
Diffstat (limited to 'src/Dolphin/os/OSInterrupt.c')
| -rw-r--r-- | src/Dolphin/os/OSInterrupt.c | 433 |
1 files changed, 433 insertions, 0 deletions
diff --git a/src/Dolphin/os/OSInterrupt.c b/src/Dolphin/os/OSInterrupt.c new file mode 100644 index 0000000..30b6e81 --- /dev/null +++ b/src/Dolphin/os/OSInterrupt.c @@ -0,0 +1,433 @@ +#include <dolphin/os.h> + +static asm void ExternalInterruptHandler(register __OSException exception, + register OSContext* context); + +// TODO: Move these to a more appropriate location +vu32 __PIRegs[12] : 0xCC003000; +vu32 __EXIRegs[16] : 0xCC006800; +vu16 __MEMRegs[64] : 0xCC004000; +vu16 __DSPRegs[32] : 0xCC005000; +vu32 __AIRegs[8] : 0xCC006C00; + +extern void __RAS_OSDisableInterrupts_begin(void); +extern void __RAS_OSDisableInterrupts_end(void); + +static __OSInterruptHandler* InterruptHandlerTable; + +static OSInterruptMask InterruptPrioTable[] = { + OS_INTERRUPTMASK_PI_ERROR, + OS_INTERRUPTMASK_PI_DEBUG, + OS_INTERRUPTMASK_MEM, + OS_INTERRUPTMASK_PI_RSW, + OS_INTERRUPTMASK_PI_VI, + OS_INTERRUPTMASK_PI_PE, + OS_INTERRUPTMASK_PI_HSP, + OS_INTERRUPTMASK_DSP_ARAM | OS_INTERRUPTMASK_DSP_DSP | OS_INTERRUPTMASK_AI | + OS_INTERRUPTMASK_EXI | OS_INTERRUPTMASK_PI_SI | OS_INTERRUPTMASK_PI_DI, + OS_INTERRUPTMASK_DSP_AI, + OS_INTERRUPTMASK_PI_CP, + 0xFFFFFFFF, +}; + +asm BOOL OSDisableInterrupts(void) { + // clang-format off + nofralloc +entry __RAS_OSDisableInterrupts_begin + mfmsr r3 + rlwinm r4, r3, 0, 17, 15 + mtmsr r4 +entry __RAS_OSDisableInterrupts_end + rlwinm r3, r3, 17, 31, 31 + blr + // clang-format on +} +asm BOOL OSEnableInterrupts(void) { + // clang-format off + nofralloc + + mfmsr r3 + ori r4, r3, 0x8000 + mtmsr r4 + rlwinm r3, r3, 17, 31, 31 + blr + // clang-format on +} + +asm BOOL OSRestoreInterrupts(register BOOL level){ + // clang-format off + + nofralloc + + cmpwi level, 0 + mfmsr r4 + beq _disable + ori r5, r4, 0x8000 + b _restore +_disable: + rlwinm r5, r4, 0, 17, 15 +_restore: + mtmsr r5 + rlwinm r3, r4, 17, 31, 31 + blr + // clang-format on +} + +__OSInterruptHandler + __OSSetInterruptHandler(__OSInterrupt interrupt, __OSInterruptHandler handler) { + __OSInterruptHandler oldHandler; + + oldHandler = InterruptHandlerTable[interrupt]; + InterruptHandlerTable[interrupt] = handler; + return oldHandler; +} + +__OSInterruptHandler __OSGetInterruptHandler(__OSInterrupt interrupt) { + return InterruptHandlerTable[interrupt]; +} + +void __OSInterruptInit(void) { + InterruptHandlerTable = OSPhysicalToCached(0x3040); + memset(InterruptHandlerTable, 0, __OS_INTERRUPT_MAX * sizeof(__OSInterruptHandler)); + + *(OSInterruptMask*)OSPhysicalToCached(0x00C4) = 0; + + *(OSInterruptMask*)OSPhysicalToCached(0x00C8) = 0; + + __PIRegs[1] = 0xf0; + + __OSMaskInterrupts(OS_INTERRUPTMASK_MEM | OS_INTERRUPTMASK_DSP | OS_INTERRUPTMASK_AI | + OS_INTERRUPTMASK_EXI | OS_INTERRUPTMASK_PI); + + __OSSetExceptionHandler(4, ExternalInterruptHandler); +} + +u32 SetInterruptMask(OSInterruptMask mask, OSInterruptMask current) { + u32 reg; + + switch (__cntlzw(mask)) { + case __OS_INTERRUPT_MEM_0: + case __OS_INTERRUPT_MEM_1: + case __OS_INTERRUPT_MEM_2: + case __OS_INTERRUPT_MEM_3: + case __OS_INTERRUPT_MEM_ADDRESS: + reg = 0; + if (!(current & OS_INTERRUPTMASK_MEM_0)) + reg |= 0x1; + if (!(current & OS_INTERRUPTMASK_MEM_1)) + reg |= 0x2; + if (!(current & OS_INTERRUPTMASK_MEM_2)) + reg |= 0x4; + if (!(current & OS_INTERRUPTMASK_MEM_3)) + reg |= 0x8; + if (!(current & OS_INTERRUPTMASK_MEM_ADDRESS)) + reg |= 0x10; + __MEMRegs[0x0000000e] = (u16)reg; + mask &= ~OS_INTERRUPTMASK_MEM; + break; + case __OS_INTERRUPT_DSP_AI: + case __OS_INTERRUPT_DSP_ARAM: + case __OS_INTERRUPT_DSP_DSP: + reg = __DSPRegs[0x00000005]; + reg &= ~0x1F8; + if (!(current & OS_INTERRUPTMASK_DSP_AI)) + reg |= 0x10; + if (!(current & OS_INTERRUPTMASK_DSP_ARAM)) + reg |= 0x40; + if (!(current & OS_INTERRUPTMASK_DSP_DSP)) + reg |= 0x100; + __DSPRegs[0x00000005] = (u16)reg; + mask &= ~OS_INTERRUPTMASK_DSP; + break; + case __OS_INTERRUPT_AI_AI: + reg = __AIRegs[0]; + reg &= ~0x2C; + if (!(current & OS_INTERRUPTMASK_AI_AI)) + reg |= 0x4; + __AIRegs[0] = reg; + mask &= ~OS_INTERRUPTMASK_AI; + break; + case __OS_INTERRUPT_EXI_0_EXI: + case __OS_INTERRUPT_EXI_0_TC: + case __OS_INTERRUPT_EXI_0_EXT: + reg = __EXIRegs[0]; + reg &= ~0x2C0F; + if (!(current & OS_INTERRUPTMASK_EXI_0_EXI)) + reg |= 0x1; + if (!(current & OS_INTERRUPTMASK_EXI_0_TC)) + reg |= 0x4; + if (!(current & OS_INTERRUPTMASK_EXI_0_EXT)) + reg |= 0x400; + __EXIRegs[0] = reg; + mask &= ~OS_INTERRUPTMASK_EXI_0; + break; + case __OS_INTERRUPT_EXI_1_EXI: + case __OS_INTERRUPT_EXI_1_TC: + case __OS_INTERRUPT_EXI_1_EXT: + reg = __EXIRegs[5]; + reg &= ~0xC0F; + + if (!(current & OS_INTERRUPTMASK_EXI_1_EXI)) + reg |= 0x1; + if (!(current & OS_INTERRUPTMASK_EXI_1_TC)) + reg |= 0x4; + if (!(current & OS_INTERRUPTMASK_EXI_1_EXT)) + reg |= 0x400; + __EXIRegs[5] = reg; + mask &= ~OS_INTERRUPTMASK_EXI_1; + break; + case __OS_INTERRUPT_EXI_2_EXI: + case __OS_INTERRUPT_EXI_2_TC: + reg = __EXIRegs[10]; + reg &= ~0xF; + if (!(current & OS_INTERRUPTMASK_EXI_2_EXI)) + reg |= 0x1; + if (!(current & OS_INTERRUPTMASK_EXI_2_TC)) + reg |= 0x4; + + __EXIRegs[10] = reg; + mask &= ~OS_INTERRUPTMASK_EXI_2; + break; + case __OS_INTERRUPT_PI_CP: + case __OS_INTERRUPT_PI_SI: + case __OS_INTERRUPT_PI_DI: + case __OS_INTERRUPT_PI_RSW: + case __OS_INTERRUPT_PI_ERROR: + case __OS_INTERRUPT_PI_VI: + case __OS_INTERRUPT_PI_DEBUG: + case __OS_INTERRUPT_PI_PE_TOKEN: + case __OS_INTERRUPT_PI_PE_FINISH: + case __OS_INTERRUPT_PI_HSP: + reg = 0xF0; + + if (!(current & OS_INTERRUPTMASK_PI_CP)) { + reg |= 0x800; + } + if (!(current & OS_INTERRUPTMASK_PI_SI)) { + reg |= 0x8; + } + if (!(current & OS_INTERRUPTMASK_PI_DI)) { + reg |= 0x4; + } + if (!(current & OS_INTERRUPTMASK_PI_RSW)) { + reg |= 0x2; + } + if (!(current & OS_INTERRUPTMASK_PI_ERROR)) { + reg |= 0x1; + } + if (!(current & OS_INTERRUPTMASK_PI_VI)) { + reg |= 0x100; + } + if (!(current & OS_INTERRUPTMASK_PI_DEBUG)) { + reg |= 0x1000; + } + if (!(current & OS_INTERRUPTMASK_PI_PE_TOKEN)) { + reg |= 0x200; + } + if (!(current & OS_INTERRUPTMASK_PI_PE_FINISH)) { + reg |= 0x400; + } + if (!(current & OS_INTERRUPTMASK_PI_HSP)) { + reg |= 0x2000; + } + __PIRegs[1] = reg; + mask &= ~OS_INTERRUPTMASK_PI; + break; + default: + break; + } + return mask; +} + +OSInterruptMask OSGetInterruptMask(void) { return *(OSInterruptMask*)OSPhysicalToCached(0x00C8); } + +OSInterruptMask OSSetInterruptMask(OSInterruptMask local) { + BOOL enabled; + OSInterruptMask global; + OSInterruptMask prev; + OSInterruptMask mask; + + enabled = OSDisableInterrupts(); + global = *(OSInterruptMask*)OSPhysicalToCached(0x00C4); + prev = *(OSInterruptMask*)OSPhysicalToCached(0x00C8); + mask = (global | prev) ^ local; + *(OSInterruptMask*)OSPhysicalToCached(0x00C8) = local; + while (mask) { + mask = SetInterruptMask(mask, global | local); + } + OSRestoreInterrupts(enabled); + return prev; +} + +OSInterruptMask __OSMaskInterrupts(OSInterruptMask global) { + BOOL enabled; + OSInterruptMask prev; + OSInterruptMask local; + OSInterruptMask mask; + + enabled = OSDisableInterrupts(); + prev = *(OSInterruptMask*)OSPhysicalToCached(0x00C4); + local = *(OSInterruptMask*)OSPhysicalToCached(0x00C8); + mask = ~(prev | local) & global; + global |= prev; + *(OSInterruptMask*)OSPhysicalToCached(0x00C4) = global; + while (mask) { + mask = SetInterruptMask(mask, global | local); + } + OSRestoreInterrupts(enabled); + return prev; +} + +OSInterruptMask __OSUnmaskInterrupts(OSInterruptMask global) { + BOOL enabled; + OSInterruptMask prev; + OSInterruptMask local; + OSInterruptMask mask; + + enabled = OSDisableInterrupts(); + prev = *(OSInterruptMask*)OSPhysicalToCached(0x00C4); + local = *(OSInterruptMask*)OSPhysicalToCached(0x00C8); + mask = (prev | local) & global; + global = prev & ~global; + *(OSInterruptMask*)OSPhysicalToCached(0x00C4) = global; + while (mask) { + mask = SetInterruptMask(mask, global | local); + } + OSRestoreInterrupts(enabled); + return prev; +} + +volatile OSTime __OSLastInterruptTime; +volatile __OSInterrupt __OSLastInterrupt; +volatile u32 __OSLastInterruptSrr0; + +void __OSDispatchInterrupt(__OSException exception, OSContext* context) { + u32 intsr; + u32 reg; + OSInterruptMask cause; + OSInterruptMask unmasked; + OSInterruptMask* prio; + __OSInterrupt interrupt; + __OSInterruptHandler handler; + intsr = __PIRegs[0]; + intsr &= ~0x00010000; + + if (intsr == 0 || (intsr & __PIRegs[1]) == 0) { + OSLoadContext(context); + } + + cause = 0; + + if (intsr & 0x00000080) { + reg = __MEMRegs[15]; + if (reg & 0x1) + cause |= OS_INTERRUPTMASK_MEM_0; + if (reg & 0x2) + cause |= OS_INTERRUPTMASK_MEM_1; + if (reg & 0x4) + cause |= OS_INTERRUPTMASK_MEM_2; + if (reg & 0x8) + cause |= OS_INTERRUPTMASK_MEM_3; + if (reg & 0x10) + cause |= OS_INTERRUPTMASK_MEM_ADDRESS; + } + + if (intsr & 0x00000040) { + reg = __DSPRegs[5]; + if (reg & 0x8) + cause |= OS_INTERRUPTMASK_DSP_AI; + if (reg & 0x20) + cause |= OS_INTERRUPTMASK_DSP_ARAM; + if (reg & 0x80) + cause |= OS_INTERRUPTMASK_DSP_DSP; + } + + if (intsr & 0x00000020) { + reg = __AIRegs[0]; + if (reg & 0x8) + cause |= OS_INTERRUPTMASK_AI_AI; + } + + if (intsr & 0x00000010) { + reg = __EXIRegs[0]; + if (reg & 0x2) + cause |= OS_INTERRUPTMASK_EXI_0_EXI; + if (reg & 0x8) + cause |= OS_INTERRUPTMASK_EXI_0_TC; + if (reg & 0x800) + cause |= OS_INTERRUPTMASK_EXI_0_EXT; + reg = __EXIRegs[5]; + if (reg & 0x2) + cause |= OS_INTERRUPTMASK_EXI_1_EXI; + if (reg & 0x8) + cause |= OS_INTERRUPTMASK_EXI_1_TC; + if (reg & 0x800) + cause |= OS_INTERRUPTMASK_EXI_1_EXT; + reg = __EXIRegs[10]; + if (reg & 0x2) + cause |= OS_INTERRUPTMASK_EXI_2_EXI; + if (reg & 0x8) + cause |= OS_INTERRUPTMASK_EXI_2_TC; + } + + if (intsr & 0x00002000) + cause |= OS_INTERRUPTMASK_PI_HSP; + if (intsr & 0x00001000) + cause |= OS_INTERRUPTMASK_PI_DEBUG; + if (intsr & 0x00000400) + cause |= OS_INTERRUPTMASK_PI_PE_FINISH; + if (intsr & 0x00000200) + cause |= OS_INTERRUPTMASK_PI_PE_TOKEN; + if (intsr & 0x00000100) + cause |= OS_INTERRUPTMASK_PI_VI; + if (intsr & 0x00000008) + cause |= OS_INTERRUPTMASK_PI_SI; + if (intsr & 0x00000004) + cause |= OS_INTERRUPTMASK_PI_DI; + if (intsr & 0x00000002) + cause |= OS_INTERRUPTMASK_PI_RSW; + if (intsr & 0x00000800) + cause |= OS_INTERRUPTMASK_PI_CP; + if (intsr & 0x00000001) + cause |= OS_INTERRUPTMASK_PI_ERROR; + + unmasked = cause & ~(*(OSInterruptMask*)OSPhysicalToCached(0x00C4) | + *(OSInterruptMask*)OSPhysicalToCached(0x00C8)); + if (unmasked) { + for (prio = InterruptPrioTable;; ++prio) { + if (unmasked & *prio) { + interrupt = (__OSInterrupt)__cntlzw(unmasked & *prio); + break; + } + } + + handler = __OSGetInterruptHandler(interrupt); + if (handler) { + if (__OS_INTERRUPT_MEM_ADDRESS < interrupt) { + __OSLastInterrupt = interrupt; + __OSLastInterruptTime = OSGetTime(); + __OSLastInterruptSrr0 = context->srr0; + } + + OSDisableScheduler(); + handler(interrupt, context); + OSEnableScheduler(); + __OSReschedule(); + OSLoadContext(context); + } + } + + OSLoadContext(context); +} + +static asm void ExternalInterruptHandler(register __OSException exception, + register OSContext* context) { +#pragma unused(exception) + // clang-format off + nofralloc + OS_EXCEPTION_SAVE_GPRS(context) + + stwu r1, -8(r1) + b __OSDispatchInterrupt + // clang-format on +} |