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vr4300: implement RANDOM register reading, and fix TLB index masking

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Giovanni Bajo 2022-05-29 01:01:49 +02:00 committed by Simon Eriksson
parent cf38848d5b
commit da84018e6e
1 changed files with 8 additions and 3 deletions
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11
vr4300/cp0.c
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@ -176,6 +176,11 @@ int VR4300_MFC0(struct vr4300 *vr4300,
else if (src + VR4300_REGISTER_CP0_0 == VR4300_CP0_REGISTER_PRID)
exdc_latch->result = 0xb22; // Hardcoded most common revision N64
else if (src == (VR4300_CP0_REGISTER_RANDOM - VR4300_REGISTER_CP0_0)) {
unsigned index = vr4300->regs[VR4300_CP0_REGISTER_WIRED] & 0x1F;
exdc_latch->result = rand() % (32 - index) + index;
}
else {
exdc_latch->result = (int32_t) mask_reg(src,
vr4300->regs[VR4300_REGISTER_CP0_0 + src]);
@ -242,7 +247,7 @@ int VR4300_TLBP(struct vr4300 *vr4300,
//
int VR4300_TLBR(struct vr4300 *vr4300,
uint32_t iw, uint64_t rs, uint64_t rt) {
unsigned index = vr4300->regs[VR4300_CP0_REGISTER_INDEX] & 0x3F;
unsigned index = vr4300->regs[VR4300_CP0_REGISTER_INDEX] & 0x1F;
uint64_t entry_hi;
uint32_t page_mask = (vr4300->cp0.page_mask[index] << 1) & 0x1FFE000U;
@ -268,7 +273,7 @@ int VR4300_TLBWI(struct vr4300 *vr4300,
uint64_t entry_lo_0 = mask_reg(2, vr4300->regs[VR4300_CP0_REGISTER_ENTRYLO0]);
uint64_t entry_lo_1 = mask_reg(3, vr4300->regs[VR4300_CP0_REGISTER_ENTRYLO1]);
uint32_t page_mask = mask_reg(5, vr4300->regs[VR4300_CP0_REGISTER_PAGEMASK]);
unsigned index = vr4300->regs[VR4300_CP0_REGISTER_INDEX] & 0x3F;
unsigned index = vr4300->regs[VR4300_CP0_REGISTER_INDEX] & 0x1F;
tlb_write(&vr4300->cp0.tlb, index, entry_hi, entry_lo_0, entry_lo_1, page_mask);
@ -289,7 +294,7 @@ int VR4300_TLBWR(struct vr4300 *vr4300,
uint64_t entry_lo_0 = mask_reg(2, vr4300->regs[VR4300_CP0_REGISTER_ENTRYLO0]);
uint64_t entry_lo_1 = mask_reg(3, vr4300->regs[VR4300_CP0_REGISTER_ENTRYLO1]);
uint32_t page_mask = mask_reg(5, vr4300->regs[VR4300_CP0_REGISTER_PAGEMASK]);
unsigned index = vr4300->regs[VR4300_CP0_REGISTER_WIRED] & 0x3F;
unsigned index = vr4300->regs[VR4300_CP0_REGISTER_WIRED] & 0x1F;
index = rand() % (32 - index) + index;
tlb_write(&vr4300->cp0.tlb, index, entry_hi, entry_lo_0, entry_lo_1, page_mask);