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1.1 root 1: /*
1.1.1.4 root 2: Hatari - cart.c
3:
4: This file is distributed under the GNU Public License, version 2 or at
5: your option any later version. Read the file gpl.txt for details.
1.1 root 6:
1.1.1.5 root 7: Cartridge program
1.1 root 8:
1.1.1.7 root 9: To load programs into memory, through TOS, we need to intercept GEMDOS so we
10: can relocate/execute programs via GEMDOS call $4B (Pexec).
1.1.1.5 root 11: We have some 68000 assembler, located at 0xFA0000 (cartridge memory), which is
12: used as our new GEMDOS handler. This checks if we need to intercept the call.
1.1 root 13:
1.1.1.7 root 14: The assembler routine can be found in 'cart_asm.s', and has been converted to
15: a byte array and stored in 'Cart_data[]' (see cartData.c).
1.1 root 16: */
1.1.1.10 root 17: const char Cart_fileid[] = "Hatari cart.c : " __DATE__ " " __TIME__;
1.1.1.8 root 18:
19: /* 2007/12/09 [NP] Change the function associated to opcodes $8, $a and $c only if hard drive */
20: /* emulation is ON. Else, these opcodes should give illegal instructions (also */
21: /* see uae-cpu/newcpu.c). */
22:
1.1 root 23:
24: #include "main.h"
25: #include "cart.h"
1.1.1.4 root 26: #include "configuration.h"
27: #include "file.h"
1.1.1.7 root 28: #include "log.h"
1.1.1.9 root 29: #include "m68000.h"
1.1 root 30: #include "stMemory.h"
1.1.1.4 root 31: #include "vdi.h"
1.1.1.8 root 32: #include "hatari-glue.h"
33: #include "newcpu.h"
1.1 root 34:
1.1.1.5 root 35: #include "cartData.c"
1.1 root 36:
37:
1.1.1.7 root 38: /* Possible cartridge file extensions to scan for */
39: static const char * const psCartNameExts[] =
40: {
41: ".img",
42: ".rom",
43: ".stc",
44: NULL
45: };
46:
47:
1.1 root 48: /*-----------------------------------------------------------------------*/
1.1.1.8 root 49: /**
50: * Load an external cartridge image file.
51: */
1.1.1.7 root 52: static void Cart_LoadImage(void)
1.1 root 53: {
1.1.1.7 root 54: Uint8 *pCartData;
55: long nCartSize;
1.1.1.4 root 56: char *pCartFileName = ConfigureParams.Rom.szCartridgeImageFileName;
57:
1.1.1.7 root 58: /* Try to load the image file: */
1.1.1.8 root 59: pCartData = File_Read(pCartFileName, &nCartSize, psCartNameExts);
1.1.1.7 root 60: if (!pCartData)
61: {
62: Log_Printf(LOG_ERROR, "Failed to load '%s'.\n", pCartFileName);
63: return;
64: }
65:
66: if (nCartSize < 40 || (nCartSize > 0x20000 && nCartSize != 0x20004))
67: {
68: Log_Printf(LOG_ERROR, "Cartridge file '%s' has illegal size.\n", pCartFileName);
69: free(pCartData);
70: return;
71: }
72:
73: /* There are two type of cartridge images, normal 1:1 images which are
74: * always smaller than or equal to 0x20000 bytes, and the .STC images,
75: * which are always 0x20004 bytes (the first 4 bytes are a dummy header).
76: * So if size is 0x20004 bytes we have to skip the first 4 bytes */
77: if (nCartSize == 0x20004)
78: {
1.1.1.8 root 79: memcpy(&RomMem[0xfa0000], pCartData+4, 0x20000);
1.1.1.7 root 80: }
81: else
82: {
1.1.1.8 root 83: memcpy(&RomMem[0xfa0000], pCartData, nCartSize);
1.1.1.7 root 84: }
85:
86: free(pCartData);
87: }
88:
89:
90: /*-----------------------------------------------------------------------*/
1.1.1.8 root 91: /**
92: * Copy ST GEMDOS intercept program image into cartridge memory space
93: * or load an external cartridge file.
94: * The intercept program is part of Hatari and used as an interface to the host
95: * file system through GemDOS. It is also needed for Line-A-Init when using
96: * extended VDI resolutions.
97: */
1.1.1.7 root 98: void Cart_ResetImage(void)
99: {
1.1.1.11! root 100: int PatchIllegal = false;
1.1.1.8 root 101:
1.1.1.4 root 102: /* "Clear" cartridge ROM space */
1.1.1.8 root 103: memset(&RomMem[0xfa0000], 0xff, 0x20000);
1.1.1.4 root 104:
1.1.1.7 root 105: /* Print a warning if user tries to use an external cartridge file
106: * together with GEMDOS HD emulation or extended VDI resolution: */
107: if (strlen(ConfigureParams.Rom.szCartridgeImageFileName) > 0)
108: {
109: if (bUseVDIRes)
110: Log_Printf(LOG_WARN, "Cartridge can't be used together with extended VDI resolution!\n");
111: if (ConfigureParams.HardDisk.bUseHardDiskDirectories)
112: Log_Printf(LOG_WARN, "Cartridge can't be used together with GEMDOS hard disk emulation!\n");
113: }
114:
115: /* Use internal cartridge when user wants extended VDI resolution or GEMDOS HD. */
1.1.1.6 root 116: if (bUseVDIRes || ConfigureParams.HardDisk.bUseHardDiskDirectories)
1.1.1.4 root 117: {
1.1.1.7 root 118: /* Copy built-in cartrige data into the cartridge memory of the ST */
1.1.1.9 root 119: memcpy(&RomMem[0xfa0000], Cart_data, sizeof(Cart_data));
1.1.1.11! root 120: PatchIllegal = true;
1.1.1.4 root 121: }
1.1.1.7 root 122: else if (strlen(ConfigureParams.Rom.szCartridgeImageFileName) > 0)
1.1.1.4 root 123: {
1.1.1.7 root 124: /* Load external image file: */
125: Cart_LoadImage();
1.1.1.4 root 126: }
1.1.1.8 root 127:
1.1.1.11! root 128: if (PatchIllegal == true)
1.1.1.8 root 129: {
130: //fprintf ( stderr ," Cart_ResetImage patch\n" );
131: /* Hatari's specific illegal opcodes for HD emulation */
132: cpufunctbl[GEMDOS_OPCODE] = OpCode_GemDos; /* 0x0008 */
133: cpufunctbl[SYSINIT_OPCODE] = OpCode_SysInit; /* 0x000a */
134: cpufunctbl[VDI_OPCODE] = OpCode_VDI; /* 0x000c */
135: }
136: else
137: {
138: //fprintf ( stderr ," Cart_ResetImage no patch\n" );
139: /* No built-in cartridge loaded : set same handler as 0x4afc (illegal) */
140: cpufunctbl[GEMDOS_OPCODE] = cpufunctbl[ 0x4afc ]; /* 0x0008 */
141: cpufunctbl[SYSINIT_OPCODE] = cpufunctbl[ 0x4afc ]; /* 0x000a */
142: cpufunctbl[VDI_OPCODE] = cpufunctbl[ 0x4afc ]; /* 0x000c */
143: }
1.1 root 144: }
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