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1.1.1.6 root 1: /*
2: Hatari - hatari-glue.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.
6:
7: This file contains some code to glue the UAE CPU core to the rest of the
8: emulator and Hatari's "illegal" opcodes.
9: */
1.1.1.13 root 10: const char HatariGlue_fileid[] = "Hatari hatari-glue.c : " __DATE__ " " __TIME__;
1.1.1.6 root 11:
1.1 root 12:
13: #include <stdio.h>
14:
1.1.1.15! root 15: #include "main.h"
! 16: #include "configuration.h"
! 17: #include "cycInt.h"
! 18: #include "tos.h"
! 19: #include "gemdos.h"
! 20: #include "cart.h"
! 21: #include "vdi.h"
! 22: #include "stMemory.h"
! 23: #include "ikbd.h"
! 24: #include "video.h"
1.1 root 25:
1.1.1.3 root 26: #include "sysdeps.h"
27: #include "maccess.h"
1.1.1.5 root 28: #include "memory.h"
1.1.1.3 root 29: #include "newcpu.h"
1.1.1.8 root 30: #include "hatari-glue.h"
1.1 root 31:
32:
1.1.1.11 root 33: struct uae_prefs currprefs, changed_prefs;
1.1 root 34:
1.1.1.8 root 35: int pendingInterrupts = 0;
1.1.1.6 root 36:
1.1 root 37:
1.1.1.14 root 38: /**
39: * Reset custom chips
40: */
1.1 root 41: void customreset(void)
42: {
1.1.1.14 root 43: pendingInterrupts = 0;
1.1.1.12 root 44:
1.1.1.14 root 45: /* In case the 6301 was executing a custom program from its RAM */
46: /* we must turn it back to the 'normal' mode. */
47: IKBD_Reset_ExeMode ();
1.1.1.13 root 48:
1.1.1.14 root 49: /* Reseting the GLUE video chip should also set freq/res register to 0 */
50: Video_Reset_Glue ();
1.1.1.6 root 51: }
52:
53:
1.1.1.14 root 54: /**
55: * Return interrupt number (1 - 7), -1 means no interrupt.
1.1.1.8 root 56: * Note that the interrupt stays pending if it can't be executed yet
1.1.1.14 root 57: * due to the interrupt level field in the SR.
58: */
1.1.1.6 root 59: int intlev(void)
60: {
1.1.1.14 root 61: /* There are only VBL and HBL autovector interrupts in the ST... */
62: assert((pendingInterrupts & ~((1<<4)|(1<<2))) == 0);
1.1.1.8 root 63:
1.1.1.14 root 64: if (pendingInterrupts & (1 << 4)) /* VBL interrupt? */
65: {
66: if (regs.intmask < 4)
67: pendingInterrupts &= ~(1 << 4);
68: return 4;
69: }
70: else if (pendingInterrupts & (1 << 2)) /* HBL interrupt? */
71: {
72: if (regs.intmask < 2)
73: pendingInterrupts &= ~(1 << 2);
74: return 2;
75: }
76:
77: return -1;
1.1 root 78: }
79:
80:
1.1.1.14 root 81: /**
82: * Initialize 680x0 emulation
83: */
1.1 root 84: int Init680x0(void)
85: {
1.1.1.14 root 86: currprefs.cpu_level = changed_prefs.cpu_level = ConfigureParams.System.nCpuLevel;
87: currprefs.cpu_compatible = changed_prefs.cpu_compatible = ConfigureParams.System.bCompatibleCpu;
88: currprefs.address_space_24 = changed_prefs.address_space_24 = true;
1.1 root 89:
1.1.1.14 root 90: init_m68k();
91:
92: return true;
1.1 root 93: }
94:
95:
1.1.1.14 root 96: /**
97: * Deinitialize 680x0 emulation
98: */
1.1 root 99: void Exit680x0(void)
100: {
1.1.1.14 root 101: memory_uninit();
1.1.1.8 root 102:
1.1.1.14 root 103: free(table68k);
104: table68k = NULL;
1.1 root 105: }
106:
107:
1.1.1.14 root 108: /**
109: * Check if the CPU type has been changed
110: */
1.1.1.11 root 111: void check_prefs_changed_cpu(void)
1.1.1.4 root 112: {
1.1.1.14 root 113: if (currprefs.cpu_level != changed_prefs.cpu_level
114: || currprefs.cpu_compatible != changed_prefs.cpu_compatible)
115: {
116: currprefs.cpu_level = changed_prefs.cpu_level;
117: currprefs.cpu_compatible = changed_prefs.cpu_compatible;
118: set_special(SPCFLAG_MODE_CHANGE);
119: build_cpufunctbl ();
120: }
1.1 root 121: }
122:
123:
1.1.1.14 root 124: /**
125: * This function will be called at system init by the cartridge routine
126: * (after gemdos init, before booting floppies).
127: * The GEMDOS vector (#$84) is setup and we also initialize the connected
128: * drive mask and Line-A variables (for an extended VDI resolution) from here.
129: */
1.1.1.7 root 130: unsigned long OpCode_SysInit(uae_u32 opcode)
1.1 root 131: {
1.1.1.14 root 132: /* Add any drives mapped by TOS in the interim */
133: ConnectedDriveMask |= STMemory_ReadLong(0x4c2);
134: /* Initialize the connected drive mask */
135: STMemory_WriteLong(0x4c2, ConnectedDriveMask);
136:
137: if (!bInitGemDOS)
138: {
139: /* Init on boot - see cart.c */
140: GemDOS_Boot();
141:
142: /* Update LineA for extended VDI res
143: * D0: LineA base, A1: Font base
144: */
145: VDI_LineA(regs.regs[0], regs.regs[9]);
146: }
147:
148: m68k_incpc(2);
149: fill_prefetch_0();
150: return 4;
1.1.1.3 root 151: }
152:
1.1.1.5 root 153:
1.1.1.14 root 154: /**
155: * Intercept GEMDOS calls.
156: * Used for GEMDOS HD emulation (see gemdos.c).
157: */
1.1.1.3 root 158: unsigned long OpCode_GemDos(uae_u32 opcode)
159: {
1.1.1.14 root 160: GemDOS_OpCode(); /* handler code in gemdos.c */
1.1.1.3 root 161:
1.1.1.14 root 162: m68k_incpc(2);
163: fill_prefetch_0();
164: return 4;
1.1 root 165: }
166:
1.1.1.5 root 167:
1.1.1.14 root 168: /**
169: * This is called after completion of each VDI call
170: */
1.1.1.5 root 171: unsigned long OpCode_VDI(uae_u32 opcode)
172: {
1.1.1.14 root 173: VDI_Complete();
1.1.1.5 root 174:
1.1.1.14 root 175: /* Set PC back to where originated from to continue instruction decoding */
176: m68k_setpc(VDI_OldPC);
1.1.1.5 root 177:
1.1.1.14 root 178: fill_prefetch_0();
179: return 4;
1.1 root 180: }
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