mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
#ifndef __SH2_H__
|
|
#define __SH2_H__
|
|
|
|
#include "../../pico/pico_types.h"
|
|
#include "../../pico/pico_port.h"
|
|
|
|
// registers - matches structure order
|
|
typedef enum {
|
|
SHR_R0 = 0, SHR_SP = 15,
|
|
SHR_PC, SHR_PPC, SHR_PR, SHR_SR,
|
|
SHR_GBR, SHR_VBR, SHR_MACH, SHR_MACL,
|
|
SH2_REGS, // register set size
|
|
SHR_T = 29, SHR_MEM = 30, SHR_TMP = 31, // drc specific pseudo regs
|
|
} sh2_reg_e;
|
|
#define SHR_R(n) (SHR_R0+(n))
|
|
|
|
typedef struct SH2_
|
|
{
|
|
// registers. this MUST correlate with enum sh2_reg_e.
|
|
uint32_t r[16] ALIGNED(32);
|
|
uint32_t pc; // 40
|
|
uint32_t ppc;
|
|
uint32_t pr;
|
|
uint32_t sr;
|
|
uint32_t gbr, vbr; // 50
|
|
uint32_t mach, macl; // 58
|
|
|
|
// common
|
|
const void *read8_map;
|
|
const void *read16_map;
|
|
const void *read32_map;
|
|
const void **write8_tab;
|
|
const void **write16_tab;
|
|
const void **write32_tab;
|
|
|
|
// drc stuff
|
|
int drc_tmp;
|
|
int irq_cycles;
|
|
void *p_bios; // convenience pointers
|
|
void *p_da;
|
|
void *p_sdram;
|
|
void *p_rom;
|
|
void *p_dram;
|
|
void *p_drcblk_da;
|
|
void *p_drcblk_ram;
|
|
unsigned int pdb_io_csum[2];
|
|
|
|
#define SH2_STATE_RUN (1 << 0) // to prevent recursion
|
|
#define SH2_STATE_SLEEP (1 << 1) // temporarily stopped (DMA, IO, ...)
|
|
#define SH2_STATE_CPOLL (1 << 2) // polling comm regs
|
|
#define SH2_STATE_VPOLL (1 << 3) // polling VDP
|
|
#define SH2_STATE_RPOLL (1 << 4) // polling address in SDRAM
|
|
#define SH2_TIMER_RUN (1 << 7) // SOC WDT timer is running
|
|
#define SH2_IN_DRC (1 << 8) // DRC in use
|
|
unsigned int state;
|
|
uint32_t poll_addr;
|
|
int poll_cycles;
|
|
int poll_cnt;
|
|
|
|
// DRC branch cache. size must be 2^n and <=128
|
|
int rts_cache_idx;
|
|
struct { uint32_t pc; void *code; } rts_cache[16];
|
|
struct { uint32_t pc; void *code; } branch_cache[128];
|
|
|
|
// interpreter stuff
|
|
int icount; // cycles left in current timeslice
|
|
unsigned int ea;
|
|
unsigned int delay;
|
|
unsigned int test_irq;
|
|
|
|
int pending_level; // MAX(pending_irl, pending_int_irq)
|
|
int pending_irl;
|
|
int pending_int_irq; // internal irq
|
|
int pending_int_vector;
|
|
int REGPARM(2) (*irq_callback)(struct SH2_ *sh2, int level);
|
|
int is_slave;
|
|
|
|
unsigned int cycles_timeslice;
|
|
|
|
struct SH2_ *other_sh2;
|
|
int (*run)(struct SH2_ *, int);
|
|
|
|
// we use 68k reference cycles for easier sync
|
|
unsigned int m68krcycles_done;
|
|
unsigned int mult_m68k_to_sh2;
|
|
unsigned int mult_sh2_to_m68k;
|
|
|
|
uint8_t data_array[0x1000]; // cache (can be used as RAM)
|
|
uint32_t peri_regs[0x200/4]; // peripheral regs
|
|
} SH2;
|
|
|
|
#define CYCLE_MULT_SHIFT 10
|
|
#define C_M68K_TO_SH2(xsh2, c) \
|
|
(int)(((uint64_t)(c) * (xsh2)->mult_m68k_to_sh2) >> CYCLE_MULT_SHIFT)
|
|
#define C_SH2_TO_M68K(xsh2, c) \
|
|
(int)(((uint64_t)(c+3U) * (xsh2)->mult_sh2_to_m68k) >> CYCLE_MULT_SHIFT)
|
|
|
|
int sh2_init(SH2 *sh2, int is_slave, SH2 *other_sh2);
|
|
void sh2_finish(SH2 *sh2);
|
|
void sh2_reset(SH2 *sh2);
|
|
int sh2_irl_irq(SH2 *sh2, int level, int nested_call);
|
|
void sh2_internal_irq(SH2 *sh2, int level, int vector);
|
|
void sh2_do_irq(SH2 *sh2, int level, int vector);
|
|
void sh2_pack(const SH2 *sh2, unsigned char *buff);
|
|
void sh2_unpack(SH2 *sh2, const unsigned char *buff);
|
|
|
|
int sh2_execute_drc(SH2 *sh2c, int cycles);
|
|
int sh2_execute_interpreter(SH2 *sh2c, int cycles);
|
|
|
|
static __inline void sh2_execute_prepare(SH2 *sh2, int use_drc)
|
|
{
|
|
#ifdef DRC_SH2
|
|
sh2->run = use_drc ? sh2_execute_drc : sh2_execute_interpreter;
|
|
#else
|
|
sh2->run = sh2_execute_interpreter;
|
|
#endif
|
|
}
|
|
|
|
static __inline int sh2_execute(SH2 *sh2, int cycles)
|
|
{
|
|
int ret;
|
|
|
|
sh2->cycles_timeslice = cycles;
|
|
ret = sh2->run(sh2, cycles);
|
|
|
|
return sh2->cycles_timeslice - ret;
|
|
}
|
|
|
|
// regs, pending_int*, cycles, reserved
|
|
#define SH2_STATE_SIZE ((24 + 2 + 2 + 12) * 4)
|
|
|
|
// pico memhandlers
|
|
// XXX: move somewhere else
|
|
u32 REGPARM(2) p32x_sh2_read8(u32 a, SH2 *sh2);
|
|
u32 REGPARM(2) p32x_sh2_read16(u32 a, SH2 *sh2);
|
|
u32 REGPARM(2) p32x_sh2_read32(u32 a, SH2 *sh2);
|
|
void REGPARM(3) p32x_sh2_write8 (u32 a, u32 d, SH2 *sh2);
|
|
void REGPARM(3) p32x_sh2_write16(u32 a, u32 d, SH2 *sh2);
|
|
void REGPARM(3) p32x_sh2_write32(u32 a, u32 d, SH2 *sh2);
|
|
|
|
// debug
|
|
#ifdef DRC_CMP
|
|
void do_sh2_trace(SH2 *current, int cycles);
|
|
void REGPARM(1) do_sh2_cmp(SH2 *current);
|
|
#endif
|
|
|
|
#endif /* __SH2_H__ */
|