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Preliminary DBDMA expansion

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dingusdev 2023-08-13 16:38:15 -07:00
parent d2e7c9a5df
commit a7ef177164
3 changed files with 38 additions and 2 deletions
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11
cpu/ppc/ppcmmu.cpp
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@ -331,6 +331,17 @@ uint8_t* mmu_get_dma_mem(uint32_t addr, uint32_t size, bool* is_writable)
}
}
void mmu_dma_store_quad(uint32_t addr, uint32_t value) {
mmu_write_vmem<uint32_t>(ppc_effective_address, value);
}
uint8_t* mmu_dma_load_quad(uint32_t addr) {
uint32_t ret_value = mmu_read_vmem<uint32_t>(addr);
uint8_t ret_array[4] = {(uint8_t)ret_value, (uint8_t)(ret_value >> 8), (uint8_t)(ret_value >> 16), (uint8_t)(ret_value >> 24)};
return ret_array;
}
// primary ITLB for all MMU modes
static std::array<TLBEntry, TLB_SIZE> itlb1_mode1;
static std::array<TLBEntry, TLB_SIZE> itlb1_mode2;

2
cpu/ppc/ppcmmu.h
View File

@ -107,6 +107,8 @@ extern std::function<void(uint32_t bat_reg)> ibat_update;
extern std::function<void(uint32_t bat_reg)> dbat_update;
extern uint8_t* mmu_get_dma_mem(uint32_t addr, uint32_t size, bool* is_writable);
extern void mmu_dma_store_quad(uint32_t addr, uint32_t value);
extern uint8_t* mmu_dma_load_quad(uint32_t addr);
extern void mmu_change_mode(void);
extern void mmu_pat_ctx_changed();

27
devices/common/dbdma.cpp
View File

@ -116,10 +116,33 @@ uint8_t DMAChannel::interpret_cmd() {
this->cmd_in_progress = true;
break;
case DBDMA_Cmd::STORE_QUAD:
LOG_F(ERROR, "Unsupported DMA Command STORE_QUAD");
if (cmd_struct.cmd_key != 6) {
LOG_F(ERROR, "Illegal key value for STORE_QUAD");
}
else {
if (cmd_struct.req_count & 0x4) {
cmd_struct.req_count = 4;
}
else if (cmd_struct.req_count & 0x2) {
cmd_struct.req_count = 2;
}
else {
cmd_struct.req_count = 1;
}
mmu_dma_store_quad(cmd_struct.address, cmd_struct.cmd_arg);
this->queue_len = 4;
this->cmd_in_progress = true;
}
break;
case DBDMA_Cmd::LOAD_QUAD:
LOG_F(ERROR, "Unsupported DMA Command LOAD_QUAD");
if (cmd_struct.cmd_key != 6) {
LOG_F(ERROR, "Illegal key value for LOAD_QUAD");
} else {
this->queue_data = mmu_dma_load_quad(cmd_struct.address);
this->queue_len = 4;
this->cmd_in_progress = true;
}
break;
case DBDMA_Cmd::NOP:
LOG_F(ERROR, "Unsupported DMA Command NOP");