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1.1.1.3 root 1: /*
1.1 root 2: * UAE - The Un*x Amiga Emulator
1.1.1.3 root 3: *
1.1 root 4: * A "replacement" for a missing Kickstart
5: * Warning! Q&D
6: *
7: * (c) 1995 Bernd Schmidt
8: */
9:
10: #include "sysconfig.h"
11: #include "sysdeps.h"
12:
13: #include "config.h"
14: #include "options.h"
1.1.1.4 ! root 15: #include "uae.h"
1.1 root 16: #include "memory.h"
17: #include "custom.h"
1.1.1.2 root 18: #include "readcpu.h"
1.1 root 19: #include "newcpu.h"
20: #include "cia.h"
21: #include "disk.h"
22: #include "ersatz.h"
23:
24: #define EOP_INIT 0
25: #define EOP_NIMP 1
26: #define EOP_SERVEINT 2
27: #define EOP_DOIO 3
28: #define EOP_OPENLIB 4
29: #define EOP_AVAILMEM 5
30: #define EOP_ALLOCMEM 6
31: #define EOP_ALLOCABS 7
1.1.1.4 ! root 32: #define EOP_LOOP 8
1.1 root 33:
1.1.1.3 root 34: void init_ersatz_rom (uae_u8 *data)
1.1 root 35: {
36: fprintf(stderr, "Trying to use Kickstart replacement.\n");
37: *data++ = 0x00; *data++ = 0x08; /* initial SP */
38: *data++ = 0x00; *data++ = 0x00;
39: *data++ = 0x00; *data++ = 0xF8; /* initial PC */
40: *data++ = 0x00; *data++ = 0x08;
41:
42: *data++ = 0xFF; *data++ = 0x0D;
43: *data++ = 0x00; *data++ = EOP_INIT;
44: *data++ = 0xFF; *data++ = 0x0D;
45: *data++ = 0x00; *data++ = EOP_NIMP;
1.1.1.3 root 46:
1.1 root 47: *data++ = 0xFF; *data++ = 0x0D;
1.1.1.4 ! root 48: *data++ = 0x00; *data++ = EOP_LOOP;
! 49: *data++ = 0xFF; *data++ = 0x0D;
1.1 root 50: *data++ = 0x00; *data++ = EOP_DOIO;
1.1.1.4 ! root 51:
1.1 root 52: *data++ = 0x4E; *data++ = 0x75;
53: *data++ = 0xFF; *data++ = 0x0D;
54: *data++ = 0x00; *data++ = EOP_SERVEINT;
55: *data++ = 0x4E; *data++ = 0x73;
1.1.1.4 ! root 56:
1.1 root 57: *data++ = 0xFF; *data++ = 0x0D;
58: *data++ = 0x00; *data++ = EOP_AVAILMEM;
59: *data++ = 0x4E; *data++ = 0x75;
60: *data++ = 0xFF; *data++ = 0x0D;
1.1.1.4 ! root 61:
1.1.1.3 root 62: *data++ = 0x00; *data++ = EOP_ALLOCMEM;
1.1 root 63: *data++ = 0x4E; *data++ = 0x75;
64: *data++ = 0xFF; *data++ = 0x0D;
65: *data++ = 0x00; *data++ = EOP_ALLOCABS;
1.1.1.4 ! root 66:
1.1 root 67: *data++ = 0x4E; *data++ = 0x75;
68: }
69:
70: static void ersatz_doio (void)
71: {
1.1.1.3 root 72: uaecptr request = m68k_areg(regs, 1);
1.1 root 73: switch (get_word (request + 0x1C)) {
74: case 9: /* TD_MOTOR is harmless */
75: case 2: case 0x8002: /* READ commands */
76: break;
1.1.1.3 root 77:
1.1 root 78: default:
79: fprintf(stderr, "Only CMD_READ supported in DoIO()\n");
80: abort();
81: }
82: {
1.1.1.3 root 83: uaecptr dest = get_long (request + 0x28);
1.1 root 84: int start = get_long (request + 0x2C) / 512;
85: int nsecs = get_long (request + 0x24) / 512;
86: int tr = start / 11;
87: int sec = start % 11;
88: while (nsecs--) {
89: DISK_ersatz_read (tr, sec, dest);
90: dest += 512;
91: if (++sec == 11)
92: sec = 0, tr++;
93: }
94: }
95: }
96:
97: static void ersatz_init (void)
98: {
99: int f;
1.1.1.3 root 100: uaecptr request;
101: uaecptr a;
102:
1.1.1.4 ! root 103: if (disk_empty (0)) {
! 104: fprintf (stderr, "You need to have a diskfile in DF0 to use the Kickstart replacement!\n");
! 105: uae_quit ();
! 106: m68k_setpc (0xF80010);
! 107: return;
! 108: }
! 109:
1.1 root 110: regs.s = 0;
111: /* Set some interrupt vectors */
112: for (a = 8; a < 0xC0; a += 4) {
1.1.1.4 ! root 113: put_long (a, 0xF8001A);
1.1 root 114: }
115: regs.isp = regs.msp = regs.usp = 0x800;
1.1.1.2 root 116: m68k_areg(regs, 7) = 0x80000;
1.1 root 117: regs.intmask = 0;
1.1.1.3 root 118:
1.1 root 119: /* Build a dummy execbase */
1.1.1.2 root 120: put_long (4, m68k_areg(regs, 6) = 0x676);
1.1.1.3 root 121: put_byte (0x676 + 0x129, 0);
122: for (f = 1; f < 105; f++) {
123: put_word (0x676 - 6*f, 0x4EF9);
1.1 root 124: put_long (0x676 - 6*f + 2, 0xF8000C);
125: }
126: /* Some "supported" functions */
1.1.1.4 ! root 127: put_long (0x676 - 456 + 2, 0xF80014);
! 128: put_long (0x676 - 216 + 2, 0xF80020);
! 129: put_long (0x676 - 198 + 2, 0xF80026);
! 130: put_long (0x676 - 204 + 2, 0xF8002c);
! 131: put_long (0x676 - 210 + 2, 0xF8002a);
1.1.1.3 root 132:
1.1 root 133: /* Build an IORequest */
134: request = 0x800;
135: put_word (request + 0x1C, 2);
136: put_long (request + 0x28, 0x4000);
137: put_long (request + 0x2C, 0);
138: put_long (request + 0x24, 0x200 * 4);
1.1.1.2 root 139: m68k_areg(regs, 1) = request;
1.1 root 140: ersatz_doio ();
141: m68k_setpc (0x400C);
1.1.1.3 root 142: fill_prefetch_0 ();
1.1 root 143:
144: /* Init the hardware */
1.1.1.2 root 145: put_long (0x3000, 0xFFFFFFFEul);
1.1 root 146: put_long (0xDFF080, 0x3000);
147: put_word (0xDFF088, 0);
148: put_word (0xDFF096, 0xE390);
149: put_word (0xDFF09A, 0xE02C);
150: put_word (0xDFF09E, 0x0000);
151: put_word (0xDFF092, 0x0038);
152: put_word (0xDFF094, 0x00D0);
153: put_word (0xDFF08E, 0x2C81);
154: put_word (0xDFF090, 0xF4C1);
155: put_word (0xDFF02A, 0x8000);
1.1.1.3 root 156:
1.1 root 157: put_byte (0xBFD100, 0xF7);
158: put_byte (0xBFEE01, 0);
159: put_byte (0xBFEF01, 0x08);
160: put_byte (0xBFDE00, 0x04);
161: put_byte (0xBFDF00, 0x84);
162: put_byte (0xBFDD00, 0x9F);
163: put_byte (0xBFED01, 0x9F);
164: }
165:
1.1.1.3 root 166: void ersatz_perform (uae_u16 what)
1.1 root 167: {
168: switch (what) {
169: case EOP_INIT:
170: ersatz_init ();
171: break;
1.1.1.3 root 172:
1.1 root 173: case EOP_SERVEINT:
174: /* Just reset all the interrupt request bits */
175: put_word (0xDFF09C, get_word (0xDFF01E) & 0x3FFF);
176: break;
1.1.1.3 root 177:
1.1 root 178: case EOP_DOIO:
179: ersatz_doio ();
180: break;
1.1.1.3 root 181:
1.1 root 182: case EOP_AVAILMEM:
1.1.1.2 root 183: m68k_dreg(regs, 0) = m68k_dreg(regs, 1) & 4 ? 0 : 0x70000;
1.1 root 184: break;
1.1.1.3 root 185:
1.1 root 186: case EOP_ALLOCMEM:
1.1.1.2 root 187: m68k_dreg(regs, 0) = m68k_dreg(regs, 1) & 4 ? 0 : 0x0F000;
1.1 root 188: break;
189:
190: case EOP_ALLOCABS:
1.1.1.2 root 191: m68k_dreg(regs, 0) = m68k_areg(regs, 1);
1.1 root 192: break;
193:
194: case EOP_NIMP:
1.1.1.4 ! root 195: fprintf (stderr, "Unimplemented Kickstart function called\n");
! 196: uae_quit ();
! 197:
! 198: /* fall through */
! 199: case EOP_LOOP:
! 200: m68k_setpc (0xF80010);
! 201: break;
! 202:
1.1.1.3 root 203: case EOP_OPENLIB:
1.1 root 204: default:
205: fprintf(stderr, "Internal error. Giving up.\n");
206: abort ();
207: }
208: }
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