BRNSystems/RISC-B
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Sync to tower

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This commit is contained in:
Bruno Rybársky
2025-02-05 14:08:20 +01:00
parent de77a0a9f5
commit 2daec68484
4 changed files with 91 additions and 63 deletions
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21
cpu/memory.c
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@@ -37,7 +37,7 @@ uint32_t read_mem32(CPU *cpu, uint32_t addr) {
return read_mem16(cpu, addr) | (read_mem16(cpu, addr + 2) << 16);
}
uint32_t read_addr(CPU *cpu) {
uint32_t read_address(CPU *cpu) {
uint32_t out = read_mem16(cpu, cpu->pc) | (read_mem16(cpu, cpu->pc + 2) << 16);
cpu->pc += 4;
if (out >= MEM_SIZE) {
@@ -46,14 +46,29 @@ uint32_t read_addr(CPU *cpu) {
return out;
}
uint8_t read_reg(CPU *cpu) {
uint8_t read_reg_number(CPU *cpu) {
uint8_t out = read_mem(cpu, cpu->pc++);
if (out >= REG_COUNT) {
out = REG_COUNT - 1;
return 0;
}
return out;
}
uint8_t read_reg(CPU *cpu, uint8_t number) {
if (number >= REG_COUNT) {
return 0;
}
return cpu->regs[number];
}
uint8_t write_reg(CPU *cpu, uint8_t number, uint8_t value) {
if (number >= REG_COUNT) {
return 1;
}
cpu->regs[number] = value;
return 0;
}
uint8_t write_mem16(CPU *cpu, uint32_t addr, uint16_t value) {
uint8_t status = write_mem(cpu, addr, value & 0xFF);
if (status) {