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Callback symbols, VIP read/write

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GuyPerfect
2024-10-15 14:11:29 -05:00
parent 767675eb42
commit c91eb0785f
6 changed files with 538 additions and 49 deletions
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core/vb.c
+57 -29
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@@ -87,7 +87,55 @@ struct VB {
int step; /* Operation sub-task ID */
} cpu;
/* Other system state */
/* VIP */
struct {
/* CTA */
struct {
uint8_t cta_l; /* Left column table index */
uint8_t cta_r; /* Right column table index */
} cta;
/* Display control */
struct {
uint8_t disp; /* Display enabled */
uint8_t fclk; /* Frame clock signal high */
uint8_t l0bsy; /* Displaying left frame buffer 0 */
uint8_t l1bsy; /* Displaying left frame buffer 1 */
uint8_t lock; /* Lock CTA */
uint8_t r0bsy; /* Displaying right frame buffer 0 */
uint8_t r1bsy; /* Displaying right frame buffer 1*/
uint8_t re; /* Memory refresh enabled */
uint8_t scanrdy; /* Mirrors are stable */
uint8_t synce; /* Servo enabled */
} dpctrl;
/* Drawing control */
struct {
uint8_t f0bsy; /* Drawing into frame buffer 0 */
uint8_t f1bsy; /* Drawing into frame buffer 1 */
uint8_t overtime; /* Drawing extends into display interval */
uint8_t sbcmp; /* Vertical output position compare */
uint8_t sbcount; /* Current vertical output position */
uint8_t sbout; /* Drawing specified vertical output position */
uint8_t xpen; /* Drawing enabled */
} xpctrl;
/* Control state */
uint8_t bkcol; /* Backdrop color */
uint8_t brtRest[4]; /* Brightness and REST */
uint8_t frmcyc; /* Game frame control */
uint8_t gplt[4][4]; /* Background palettes */
uint16_t intenb; /* Interrupts enabled */
uint16_t intpnd; /* Interrupts pending */
uint8_t jplt[4][4]; /* Object palettes */
uint16_t spt[4]; /* Object control */
/* Other state */
uint8_t vram[0x40000]; /* Video memory */
} vip;
/* Other state */
uint8_t wram[0x10000]; /* System RAM */
/* Application data */
@@ -120,6 +168,7 @@ static int32_t SignExtend(int32_t value, int32_t bits) {
#include "bus.c"
#include "cpu.c"
#include "vip.c"
@@ -128,13 +177,15 @@ static int32_t SignExtend(int32_t value, int32_t bits) {
/* Process a simulation for a given number of clocks */
static int sysEmulate(VB *sim, uint32_t clocks) {
return
cpuEmulate(sim, clocks)
cpuEmulate(sim, clocks) |
vipEmulate(sim, clocks)
;
}
/* Determine how many clocks are guaranteed to process */
static uint32_t sysUntil(VB *sim, uint32_t clocks) {
clocks = cpuUntil(sim, clocks);
clocks = vipUntil(sim, clocks);
return clocks;
}
@@ -259,38 +310,15 @@ VBAPI int32_t vbRead(VB *sim, uint32_t address, int type) {
/* Simulate a hardware reset */
VBAPI VB* vbReset(VB *sim) {
uint32_t x; /* Iterator */
int x; /* Iterator */
/* WRAM (the hardware does not do this) */
for (x = 0; x < 0x10000; x++)
sim->wram[x] = 0x00;
/* CPU (normal) */
sim->cpu.exception = 0;
sim->cpu.halt = 0;
sim->cpu.irq = 0;
sim->cpu.pc = 0xFFFFFFF0;
cpuSetSystemRegister(sim, VB_ECR, 0x0000FFF0, 1);
cpuSetSystemRegister(sim, VB_PSW, 0x00008000, 1);
/* CPU (extra, hardware does not do this) */
sim->cpu.adtre = 0x00000000;
sim->cpu.eipc = 0x00000000;
sim->cpu.eipsw = 0x00000000;
sim->cpu.fepc = 0x00000000;
sim->cpu.fepsw = 0x00000000;
sim->cpu.sr29 = 0x00000000;
sim->cpu.sr31 = 0x00000000;
cpuSetSystemRegister(sim, VB_CHCW, 0x00000000, 1);
for (x = 0; x < 32; x++)
sim->cpu.program[x] = 0x00000000;
/* CPU (other) */
sim->cpu.clocks = 0;
sim->cpu.nextPC = 0xFFFFFFF0;
sim->cpu.operation = CPU_FETCH;
sim->cpu.step = 0;
/* Components */
cpuReset(sim);
vipReset(sim);
return sim;
}