128 lines
2.2 KiB
C++
128 lines
2.2 KiB
C++
#include <stdint.h>
|
|
|
|
#include "sh7091.h"
|
|
#include "holly.h"
|
|
|
|
enum load_command {
|
|
CMD_NONE,
|
|
CMD_DATA, // DATA 0000 0000 {data}
|
|
CMD_JUMP, // JUMP 0000
|
|
};
|
|
|
|
struct load_state {
|
|
union {
|
|
uint8_t buf[12];
|
|
struct {
|
|
uint8_t cmd[4];
|
|
uint32_t addr1;
|
|
uint32_t addr2;
|
|
};
|
|
};
|
|
uint32_t len;
|
|
enum load_command command;
|
|
};
|
|
|
|
static struct load_state state;
|
|
|
|
void move(void *dst, const void *src, size_t n)
|
|
{
|
|
uint8_t * d = reinterpret_cast<uint8_t *>(dst);
|
|
const uint8_t * s = reinterpret_cast<const uint8_t *>(src);
|
|
|
|
if (d==s) return;
|
|
if (d<s) {
|
|
for (; n; n--) *d++ = *s++;
|
|
} else {
|
|
while (n) n--, d[n] = s[n];
|
|
}
|
|
}
|
|
|
|
void load_init()
|
|
{
|
|
state.len = 0;
|
|
state.command = CMD_NONE;
|
|
}
|
|
|
|
void debug(const char * s)
|
|
{
|
|
char c;
|
|
while ((c = *s++)) {
|
|
sh7091.SCIF.SCFTDR2 = (uint8_t)c;
|
|
}
|
|
}
|
|
|
|
void load_recv(uint8_t c)
|
|
{
|
|
if (state.command == CMD_NONE)
|
|
state.buf[state.len++] = c;
|
|
|
|
while (1) {
|
|
switch (state.command) {
|
|
case CMD_NONE:
|
|
if (state.len >= 4) {
|
|
if (state.buf[0] == 'D' &&
|
|
state.buf[1] == 'A' &&
|
|
state.buf[2] == 'T' &&
|
|
state.buf[3] == 'A') {
|
|
if (state.len < 12) {
|
|
return;
|
|
} else {
|
|
debug("data\n");
|
|
state.command = CMD_DATA;
|
|
return;
|
|
}
|
|
} else if (state.buf[0] == 'J' &&
|
|
state.buf[1] == 'U' &&
|
|
state.buf[2] == 'M' &&
|
|
state.buf[3] == 'P') {
|
|
if (state.len < 8) {
|
|
return;
|
|
} else {
|
|
debug("jump\n");
|
|
state.command = CMD_JUMP;
|
|
}
|
|
} else {
|
|
move(&state.buf[0], &state.buf[4], state.len - 4);
|
|
state.len -= 4;
|
|
}
|
|
} else {
|
|
return;
|
|
}
|
|
break;
|
|
case CMD_DATA:
|
|
{
|
|
uint32_t * size = &state.addr1;
|
|
uint8_t * dest = reinterpret_cast<uint8_t *>(state.addr2);
|
|
if (*size > 0) {
|
|
sh7091.SCIF.SCFTDR2 = c;
|
|
|
|
// write c to dest
|
|
*dest = c;
|
|
state.addr2++;
|
|
|
|
(*size)--;
|
|
}
|
|
if (*size == 0) {
|
|
state.len = 0;
|
|
state.command = CMD_NONE;
|
|
debug("next\n");
|
|
}
|
|
return;
|
|
break;
|
|
}
|
|
case CMD_JUMP:
|
|
// jump
|
|
state.len = 0;
|
|
state.command = CMD_NONE;
|
|
debug("prejump\n");
|
|
holly.VO_BORDER_COL = (31 << 11);
|
|
void (*fptr)(void) = (void (*)(void))state.addr1;
|
|
holly.VO_BORDER_COL = (63 << 5) | (31 << 0);
|
|
fptr();
|
|
debug("postjump\n");
|
|
return;
|
|
break;
|
|
}
|
|
}
|
|
}
|