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cpu: implement enought to make bootrom use display hardware

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This commit is contained in:
Max Regan
2018-01-01 16:51:56 -08:00
parent 92f9ef591b
commit d62a8d3f0e
2 changed files with 82 additions and 22 deletions
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102
src/gbemu/cpu.c
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@@ -150,7 +150,6 @@ static const unsigned int cb_op_cycles[256] = { 0 };
#define LD_D16(cpu, reg) \
do { \
printf("LD_D16 " #reg "\n"); \
(reg) = (cpu)->mem_read((cpu), (cpu)->pc++); \
(reg) |= (uint16_t) (cpu)->mem_read((cpu), (cpu)->pc++) << 8; \
} while (0)
@@ -233,17 +232,18 @@ static const unsigned int cb_op_cycles[256] = { 0 };
#define CP_8(cpu, dst, src) \
do { \
uint8_t _tmp; \
uint8_t _dst = dst; \
uint8_t _src = src; \
(cpu)->nf = 1; \
(cpu)->hf = CALC_H_SUB((dst), (src)); \
(cpu)->cf = CALC_C_SUB((dst), (src)); \
_tmp = (dst) - (src); \
(cpu)->hf = CALC_H_SUB((_dst), (_src)); \
(cpu)->cf = CALC_C_SUB((_dst), (_src)); \
_tmp = (_dst) - (_src); \
(cpu)->zf = ((_tmp) == 0); \
} while (0)
#define JR_8(cpu) \
do { \
val_16 = cpu->mem_read(cpu, cpu->pc); \
val_16 = cpu->mem_read(cpu, cpu->pc++); \
/* sign-extend */ \
val_16 |= GET_BIT(val_16, 7) ? 0xff00 : 0; \
cpu->pc += val_16; \
@@ -253,7 +253,7 @@ static const unsigned int cb_op_cycles[256] = { 0 };
#define POP_16(cpu, dst) \
do { \
(dst) = (cpu)->mem_read((cpu), (cpu)->sp++); \
(dst) = (uint16_t) (cpu)->mem_read((cpu), (cpu)->sp++) << 8; \
(dst) |= (uint16_t) (cpu)->mem_read((cpu), (cpu)->sp++) << 8; \
} while (0)
#define PUSH_16(cpu, src) \
@@ -264,18 +264,20 @@ static const unsigned int cb_op_cycles[256] = { 0 };
#define CALL(cpu) \
do { \
uint16_t pc_base; \
cpu->mem_write(cpu, --cpu->sp, cpu->pc); \
cpu->mem_write(cpu, --cpu->sp, cpu->pc >> 8); \
cpu->pc = cpu->mem_read(cpu, cpu->pc++); \
cpu->pc |= (uint16_t) cpu->mem_read(cpu, cpu->pc) << 8; \
cpu->pc++; \
pc_base = cpu->mem_read(cpu, cpu->pc++); \
pc_base |= (uint16_t) cpu->mem_read(cpu, cpu->pc) << 8; \
cpu->pc = pc_base; \
} while (0)
#define RET(cpu) \
do { \
(cpu)->pc = 0; \
(cpu)->pc |= (uint16_t) (cpu)->mem_read((cpu), (cpu)->sp--) << 8; \
(cpu)->pc |= (cpu)->mem_read((cpu), (cpu)->sp--); \
(cpu)->pc |= (uint16_t) (cpu)->mem_read((cpu), (cpu)->sp++) << 8; \
(cpu)->pc |= (cpu)->mem_read((cpu), (cpu)->sp++); \
(cpu)->pc += 2; \
} while (0)
#define RST(cpu, n) \
@@ -283,7 +285,26 @@ static const unsigned int cb_op_cycles[256] = { 0 };
(cpu)->mem_write((cpu), (cpu)->sp++, (cpu)->pc >> 8); \
(cpu)->mem_write((cpu), (cpu)->sp++, (cpu)->pc); \
(cpu)->pc = (n); \
} while (0);
} while (0)
#define BIT(cpu, reg, bit) \
do { \
(cpu)->zf = !GET_BIT(reg, bit); \
(cpu)->nf = 0; \
(cpu)->hf = 1; \
} while (0)
#define RL(cpu, reg) \
do { \
uint8_t ci = (cpu)->cf; \
uint8_t tmp = reg; \
(cpu)->nf = 0; \
(cpu)->hf = 0; \
(cpu)->cf = GET_BIT(tmp, 7); \
tmp = tmp << 1; \
(tmp) |= ci; \
(cpu)->zf = (tmp) == 0; \
} while (0)
void lr35902_cycle(struct lr35902_state *cpu)
{
@@ -292,16 +313,19 @@ void lr35902_cycle(struct lr35902_state *cpu)
uint8_t val;
uint16_t val_16;
cpu->metrics.cycles++;
if (cpu->stall_cycles > 0) {
cpu->stall_cycles--;
if (cpu->stall_cycles == 0) {
cpu->metrics.retired_instrs++;
}
return;
}
inst = cpu->mem_read(cpu, cpu->pc++);
cycles = op_cycles[inst];
printf("running command\n");
switch (inst) {
case 0x00: /* NOP */
break;
@@ -948,7 +972,9 @@ void lr35902_cycle(struct lr35902_state *cpu)
cpu->pc += 2;
}
break;
case 0xc5:
case 0xc5: /* PUSH BC */
PUSH_16(cpu, cpu->bc);
break;
case 0xc6:
case 0xc7: /* RST 00 */
RST(cpu, 0);
@@ -983,13 +1009,29 @@ void lr35902_cycle(struct lr35902_state *cpu)
case 0x0e:
case 0x0f:
case 0x10:
RL(cpu, cpu->b);
break;
case 0x11:
RL(cpu, cpu->c);
break;
case 0x12:
RL(cpu, cpu->d);
break;
case 0x13:
RL(cpu, cpu->e);
break;
case 0x14:
RL(cpu, cpu->h);
break;
case 0x15:
RL(cpu, cpu->l);
break;
case 0x16:
ASSERT(0);
break;
case 0x17:
RL(cpu, cpu->a);
break;
case 0x18:
case 0x19:
case 0x1a:
@@ -1090,10 +1132,16 @@ void lr35902_cycle(struct lr35902_state *cpu)
case 0x79:
case 0x7a:
case 0x7b:
assert(0);
case 0x7c:
BIT(cpu, cpu->h, 7);
break;
case 0x7d:
case 0x7e:
assert(0);
case 0x7f:
BIT(cpu, cpu->a, 7);
break;
case 0x80:
case 0x81:
case 0x82:
@@ -1258,7 +1306,9 @@ void lr35902_cycle(struct lr35902_state *cpu)
cpu->pc += 2;
}
break;
case 0xd5:
case 0xd5:/* PUSH DE */
PUSH_16(cpu, cpu->de);
break;
case 0xd6:
case 0xd7: /* RST 0x10 */
RST(cpu, 0x10);
@@ -1297,14 +1347,20 @@ void lr35902_cycle(struct lr35902_state *cpu)
break;
case 0xe4: /* UNDEF */
break;
case 0xe5:
case 0xe5: /* PUSH HL */
PUSH_16(cpu, cpu->hl);
break;
case 0xe6:
case 0xe7: /* RST 0x20 */
RST(cpu, 0x20);
break;
case 0xe8:
case 0xe9:
case 0xea:
case 0xea: /* LD (a16), A */
val_16 = cpu->mem_read(cpu, cpu->pc++);
val_16 |= cpu->mem_read(cpu, cpu->pc++) << 8;
cpu->mem_write(cpu, val_16, cpu->a);
break;
case 0xeb: /* UNDEF */
break;
case 0xec: /* UNDEF */
@@ -1328,7 +1384,9 @@ void lr35902_cycle(struct lr35902_state *cpu)
case 0xf3:
case 0xf4: /* UNDEF */
break;
case 0xf5:
case 0xf5: /* PUSH AF */
PUSH_16(cpu, cpu->af);
break;
case 0xf6:
case 0xf7: /* RST 0x30 */
RST(cpu, 0x30);
@@ -1341,7 +1399,9 @@ void lr35902_cycle(struct lr35902_state *cpu)
break;
case 0xfd: /* UNDEF */
break;
case 0xfe:
case 0xfe: /* CP d8 */
CP_8(cpu, cpu->a, cpu->mem_read(cpu, cpu->pc++));
break;
case 0xff: /* RST 0x38 */
RST(cpu, 0x38);
break;