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add support for uuid-based extensions

This commit is contained in:
~d6 2023-12-18 22:54:47 -05:00
parent ae1e6367a3
commit 73e965c105
1 changed files with 44 additions and 8 deletions
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52
src/devices/system.c
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@ -101,6 +101,46 @@ system_init(Uxn *u, Uint8 *ram, char *rom)
return 1;
}
static void
system_expansion_copy(Uxn *u, Uint8 *ram, Uint16 addr)
{
Uint16 i, length = PEEK2(ram + addr + 1);
Uint16 a_page = PEEK2(ram + addr + 1 + 2), a_addr = PEEK2(ram + addr + 1 + 4);
Uint16 b_page = PEEK2(ram + addr + 1 + 6), b_addr = PEEK2(ram + addr + 1 + 8);
int src = (a_page % RAM_PAGES) * 0x10000, dst = (b_page % RAM_PAGES) * 0x10000;
for(i = 0; i < length; i++)
ram[dst + (Uint16)(b_addr + i)] = ram[src + (Uint16)(a_addr + i)];
}
static int
uuid_eq(Uint8 *m, Uint8 uuid[16])
{
for(int i = 0; i < 16; i++)
if (m[i] != uuid[i])
return 0;
return 1;
}
/* console device: 01231250-d878-4462-bc41-d0927645a2fa */
static Uint8 console_uuid[16] = {
0x01, 0x23, 0x12, 0x50, 0xd8, 0x78, 0x44, 0x62,
0xbc, 0x41, 0xd0, 0x92, 0x76, 0x45, 0xa2, 0xfa
};
static void
system_expansion_uxn38_device(Uxn *u, Uint8 *ram, Uint16 addr)
{
Uint8 dev_id = ram[addr + 1];
Uint8 *uuid = &ram[addr + 2];
if(dev_id == 0x10 && uuid_eq(uuid, console_uuid) != 0) {
ram[addr + 18] = 0x00;
ram[addr + 19] = 0xff;
} else {
ram[addr + 18] = 0x00;
ram[addr + 19] = 0x00;
}
}
/* IO */
Uint8
@ -122,14 +162,10 @@ system_deo(Uxn *u, Uint8 *d, Uint8 port)
case 0x3:
ram = u->ram;
addr = PEEK2(d + 2);
if(ram[addr] == 0x1) {
Uint16 i, length = PEEK2(ram + addr + 1);
Uint16 a_page = PEEK2(ram + addr + 1 + 2), a_addr = PEEK2(ram + addr + 1 + 4);
Uint16 b_page = PEEK2(ram + addr + 1 + 6), b_addr = PEEK2(ram + addr + 1 + 8);
int src = (a_page % RAM_PAGES) * 0x10000, dst = (b_page % RAM_PAGES) * 0x10000;
for(i = 0; i < length; i++)
ram[dst + (Uint16)(b_addr + i)] = ram[src + (Uint16)(a_addr + i)];
}
if(ram[addr] == 0x1)
system_expansion_copy(u, ram, addr);
else if(ram[addr] == 0x3)
system_expansion_uxn38_device(u, ram, addr);
break;
case 0x4:
u->wst.ptr = d[4];