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Add autoconfig support for fast mem location

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Niklas Ekström
2020-11-30 23:49:26 +01:00
parent 01618f8014
commit 8c2765ee97
1 changed files with 68 additions and 1 deletions
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69
emulator.c
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@@ -73,7 +73,7 @@ Copyright 2020 Claude Schwartz
int fast_base_configured;
unsigned int fast_base;
#define FAST_SIZE (256 * 1024 * 1024)
#define FAST_SIZE (8 * 1024 * 1024)
#define GAYLEBASE 0xD80000
#define GAYLESIZE (448 * 1024)
@@ -81,6 +81,13 @@ unsigned int fast_base;
#define KICKBASE 0xF80000
#define KICKSIZE (512 * 1024)
#define AC_BASE 0xE80000
#define AC_SIZE (64 * 1024)
#define AC_PIC_COUNT 1
int ac_current_pic = 0;
int ac_done = 0;
int mem_fd;
int mem_fd_gpclk;
int gayle_emulation_enabled = 1;
@@ -341,11 +348,67 @@ int cpu_irq_ack(int level) {
return level;
}
static unsigned char ac_fast_ram_rom[] = {
0xe, 0x0, // 00/02, link into memory free list, 8 MB
0x6, 0x9, // 04/06, product id
0x8, 0x0, // 08/0a, preference to 8 MB space
0x0, 0x0, // 0c/0e, reserved
0x0, 0x7, 0xd, 0xb, // 10/12/14/16, mfg id
0x0, 0x0, 0x0, 0x0, 0x0, 0x4, 0x2, 0x0 // 18/.../26, serial
};
static unsigned int ac_fast_ram_read_memory_8(unsigned int address) {
unsigned char val = 0;
if ((address & 1) == 0 && (address / 2) < sizeof(ac_fast_ram_rom))
val = ac_fast_ram_rom[address / 2];
val <<= 4;
if (address != 0 && address != 2 && address != 40 && address != 42)
val ^= 0xf0;
return (unsigned int)val;
}
static void ac_fast_ram_write_memory_8(unsigned int address, unsigned int value) {
int done = 0;
if (address == 0x4a) { // base[19:16]
fast_base = (value & 0xf0) << (16 - 4);
} else if (address == 0x48) { // base[23:20]
fast_base &= 0xff0fffff;
fast_base |= (value & 0xf0) << (20 - 4);
fast_base_configured = 1;
done = 1;
} else if (address == 0x4c) { // shut up
done = 1;
}
if (done) {
ac_current_pic++;
if (ac_current_pic == AC_PIC_COUNT)
ac_done = 1;
}
}
static unsigned int autoconfig_read_memory_8(unsigned int address) {
if (ac_current_pic == 0) {
return ac_fast_ram_read_memory_8(address);
}
}
static void autoconfig_write_memory_8(unsigned int address, unsigned int value) {
if (ac_current_pic == 0) {
return ac_fast_ram_write_memory_8(address, value);
}
}
unsigned int m68k_read_memory_8(unsigned int address) {
if (fast_base_configured && address >= fast_base && address < fast_base + FAST_SIZE) {
return fast_ram_array[address - fast_base];
}
if (!ac_done && address >= AC_BASE && address < AC_BASE + AC_SIZE) {
return autoconfig_read_memory_8(address - AC_BASE);
}
if (maprom == 1) {
if (address >= KICKBASE && address < KICKBASE + KICKSIZE) {
return g_kick[address - KICKBASE];
@@ -424,6 +487,10 @@ void m68k_write_memory_8(unsigned int address, unsigned int value) {
return;
}
if (!ac_done && address >= AC_BASE && address < AC_BASE + AC_SIZE) {
return autoconfig_write_memory_8(address - AC_BASE, value);
}
if (gayle_emulation_enabled) {
if (address >= GAYLEBASE && address < GAYLEBASE + GAYLESIZE) {
writeGayleB(address, value);