75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
#include <cpu.h>
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#include <bus.h>
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#include <common.h>
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#include <emu.h>
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#include <interrupts.h>
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cpu_context ctx = {0};
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void cpu_init() {
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ctx.regs.pc = 0x100;
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}
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static void fetch_instruction() {
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ctx.cur_opcode = bus_read(ctx.regs.pc++);
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ctx.cur_inst = instruction_by_opcode(ctx.cur_opcode);
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}
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static void execute() {
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IN_PROC proc = inst_get_processor(ctx.cur_inst->type);
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if (!proc) {
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printf("no implementation(%02X)\n", ctx.cur_opcode);
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NO_IMPL
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}
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proc(&ctx);
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}
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bool cpu_step() {
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if(!ctx.halted) {
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u16 pc = ctx.regs.pc;
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fetch_instruction();
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fetch_data();
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char flags[16];
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sprintf(flags, "%c%c%c%c",
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ctx.regs.f & (1 << 7) ? 'Z' : '-',
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ctx.regs.f & (1 << 6) ? 'N' : '-',
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ctx.regs.f & (1 << 5) ? 'H' : '-',
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ctx.regs.f & (1 << 4) ? 'C' : '-'
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);
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printf("%08lX - %04X: %-7s (%02X %02X %02X) A: %02X F: %s BC: %02X%02X DE: %02X%02X HL: %02X%02X SP: %04X PC: %04X\n", emu_get_context()->ticks, pc, inst_name(ctx.cur_inst->type), ctx.cur_opcode, bus_read(pc+1), bus_read(pc+2), ctx.regs.a, flags, ctx.regs.b, ctx.regs.c, ctx.regs.d, ctx.regs.e, ctx.regs.h, ctx.regs.l, ctx.regs.sp, ctx.regs.pc);
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if(ctx.cur_inst == NULL){
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printf("Unknown Instruction! %02X\n", ctx.cur_opcode);
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exit(-7);
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}
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execute();
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} else {
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//is halted
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emu_cycles(1);
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if(ctx.int_flags) {
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ctx.halted = false;
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}
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}
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if(ctx.int_master_enabled) {
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cpu_handle_interrupts(&ctx);
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ctx.enabling_ime = false;
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}
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if(ctx.enabling_ime) {
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ctx.int_master_enabled = true;
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}
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return true;
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}
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u8 cpu_get_ie_register(){
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return ctx.ie_register;
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}
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void cpu_set_ie_register(u8 ie){
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ctx.ie_register = ie;
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} |