103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
#include <cpu.h>
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#include <bus.h>
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extern cpu_context ctx;
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u16 reverse(u16 n) {
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return ((n & 0XFF00) >> 8) | ((n & 0x00FF) << 8);
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}
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u16 cpu_read_reg(reg_type rt) {
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switch(rt) {
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case RT_A: return ctx.regs.a;
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case RT_F: return ctx.regs.f;
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case RT_B: return ctx.regs.b;
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case RT_C: return ctx.regs.c;
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case RT_D: return ctx.regs.d;
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case RT_E: return ctx.regs.e;
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case RT_H: return ctx.regs.h;
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case RT_L: return ctx.regs.l;
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case RT_AF: return reverse(*((u16 *)&ctx.regs.a));
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case RT_BC: return reverse(*((u16 *)&ctx.regs.b));
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case RT_DE: return reverse(*((u16 *)&ctx.regs.d));
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case RT_HL: return reverse(*((u16 *)&ctx.regs.h));
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case RT_PC: return ctx.regs.pc;
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case RT_SP: return ctx.regs.sp;
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default: return 0;
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}
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}
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void cpu_set_reg(reg_type rt, u16 val) {
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switch(rt) {
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case RT_A: ctx.regs.a = val & 0XFF; break;
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case RT_F: ctx.regs.f = val & 0XFF; break;
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case RT_B: ctx.regs.b = val & 0XFF; break;
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case RT_C: ctx.regs.c = val & 0XFF; break;
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case RT_D: ctx.regs.d = val & 0XFF; break;
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case RT_E: ctx.regs.e = val & 0XFF; break;
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case RT_H: ctx.regs.h = val & 0XFF; break;
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case RT_L: ctx.regs.l = val & 0XFF; break;
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case RT_AF: *((u16 *)&ctx.regs.a) = reverse(val); break;
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case RT_BC: *((u16 *)&ctx.regs.b) = reverse(val); break;
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case RT_DE: *((u16 *)&ctx.regs.d) = reverse(val); break;
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case RT_HL: *((u16 *)&ctx.regs.h) = reverse(val); break;
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case RT_PC: ctx.regs.pc = val; break;
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case RT_SP: ctx.regs.sp = val; break;
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case RT_NONE: break;
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}
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}
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u8 cpu_read_reg8(reg_type rt) {
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switch(rt) {
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case RT_A: return ctx.regs.a;
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case RT_F: return ctx.regs.f;
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case RT_B: return ctx.regs.b;
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case RT_C: return ctx.regs.c;
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case RT_D: return ctx.regs.d;
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case RT_E: return ctx.regs.e;
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case RT_H: return ctx.regs.h;
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case RT_L: return ctx.regs.l;
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case RT_HL: {
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return bus_read(cpu_read_reg(RT_HL));
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}
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default:
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printf("**ERR INVALID REG8: %d\n", rt);
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NO_IMPL
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}
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}
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void cpu_set_reg8(reg_type rt, u8 val) {
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switch(rt) {
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case RT_A: ctx.regs.a = val & 0XFF; break;
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case RT_F: ctx.regs.f = val & 0XFF; break;
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case RT_B: ctx.regs.b = val & 0XFF; break;
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case RT_C: ctx.regs.c = val & 0XFF; break;
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case RT_D: ctx.regs.d = val & 0XFF; break;
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case RT_E: ctx.regs.e = val & 0XFF; break;
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case RT_H: ctx.regs.h = val & 0XFF; break;
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case RT_L: ctx.regs.l = val & 0XFF; break;
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case RT_HL: bus_write(cpu_read_reg(RT_HL), val); break;
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default:
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printf("**ERR INVALID REG8: %d\n", rt);
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NO_IMPL
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}
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}
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cpu_registers *cpu_get_regs() {
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return &ctx.regs;
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}
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u8 cpu_get_int_flags(){
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return ctx.int_flags;
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}
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void cpu_set_int_flags(u8 value){
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ctx.int_flags = value;
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} |