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1.1 root 1: /*
2: Hatari - hatari-glue.c
3:
1.1.1.4 root 4: This file is distributed under the GNU General Public License, version 2
5: or at your option any later version. Read the file gpl.txt for details.
1.1 root 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: */
10: const char HatariGlue_fileid[] = "Hatari hatari-glue.c : " __DATE__ " " __TIME__;
11:
12:
13: #include <stdio.h>
14:
15: #include "main.h"
16: #include "configuration.h"
17: #include "cycInt.h"
18: #include "tos.h"
19: #include "gemdos.h"
1.1.1.4 root 20: #include "natfeats.h"
1.1 root 21: #include "cart.h"
22: #include "vdi.h"
23: #include "stMemory.h"
24: #include "ikbd.h"
25: #include "screen.h"
26: #include "video.h"
1.1.1.2 root 27: #include "psg.h"
1.1.1.4 root 28: #include "mfp.h"
29: #include "fdc.h"
1.1 root 30:
31: #include "sysdeps.h"
1.1.1.6 root 32: #include "options_cpu.h"
1.1 root 33: #include "maccess.h"
34: #include "memory.h"
1.1.1.4 root 35: #include "m68000.h"
1.1 root 36: #include "newcpu.h"
1.1.1.3 root 37: #include "cpu_prefetch.h"
1.1 root 38: #include "hatari-glue.h"
39:
40:
41: struct uae_prefs currprefs, changed_prefs;
42:
43: int pendingInterrupts = 0;
44:
45:
46: /**
47: * Reset custom chips
1.1.1.4 root 48: * In case the RESET instruction is called, we must reset all the peripherals
49: * connected to the CPU's reset pin.
1.1 root 50: */
51: void customreset(void)
52: {
53: pendingInterrupts = 0;
54:
1.1.1.4 root 55: /* Reset the IKBD */
56: IKBD_Reset ( false );
1.1 root 57:
58: /* Reseting the GLUE video chip should also set freq/res register to 0 */
59: Video_Reset_Glue ();
1.1.1.2 root 60:
1.1.1.7 ! root 61: /* Reset the YM2149 (stop any sound) */
! 62: PSG_Reset ();
1.1.1.4 root 63:
64: /* Reset the MFP */
65: MFP_Reset ();
66:
67: /* Reset the FDC */
1.1.1.5 root 68: FDC_Reset ( false );
1.1 root 69: }
70:
71:
72: /**
73: * Return interrupt number (1 - 7), -1 means no interrupt.
74: * Note that the interrupt stays pending if it can't be executed yet
75: * due to the interrupt level field in the SR.
76: */
77: int intlev(void)
78: {
1.1.1.6 root 79: if ( pendingInterrupts & (1 << 6) ) /* MFP/DSP interrupt ? */
80: return 6;
81: else if ( pendingInterrupts & (1 << 4) ) /* VBL interrupt ? */
1.1.1.4 root 82: return 4;
83: else if ( pendingInterrupts & (1 << 2) ) /* HBL interrupt ? */
84: return 2;
1.1 root 85:
86: return -1;
87: }
88:
89: /**
90: * Initialize 680x0 emulation
91: */
92: int Init680x0(void)
93: {
94: currprefs.cpu_level = changed_prefs.cpu_level = ConfigureParams.System.nCpuLevel;
95:
1.1.1.7 ! root 96: switch (currprefs.cpu_level)
! 97: {
! 98: case 0 : changed_prefs.cpu_model = 68000; break;
! 99: case 1 : changed_prefs.cpu_model = 68010; break;
! 100: case 2 : changed_prefs.cpu_model = 68020; break;
! 101: case 3 : changed_prefs.cpu_model = 68030; break;
! 102: case 4 : changed_prefs.cpu_model = 68040; break;
! 103: case 5 : changed_prefs.cpu_model = 68060; break;
1.1 root 104: default: fprintf (stderr, "Init680x0() : Error, cpu_level unknown\n");
105: }
1.1.1.7 ! root 106:
! 107: changed_prefs.int_no_unimplemented = true;
! 108: changed_prefs.fpu_no_unimplemented = true;
! 109: changed_prefs.cpu_compatible = ConfigureParams.System.bCompatibleCpu;
! 110: changed_prefs.address_space_24 = ConfigureParams.System.bAddressSpace24;
! 111: changed_prefs.cpu_cycle_exact = ConfigureParams.System.bCycleExactCpu;
! 112: changed_prefs.fpu_model = ConfigureParams.System.n_FPUType;
! 113: changed_prefs.fpu_strict = ConfigureParams.System.bCompatibleFPU;
1.1.1.6 root 114:
115: /* Set the MMU model by taking the same value as CPU model */
116: /* MMU is only supported for CPU >=68030 */
1.1.1.7 ! root 117: changed_prefs.mmu_model = 0; /* MMU disabled by default */
! 118: if (ConfigureParams.System.bMMU && changed_prefs.cpu_model >= 68030)
! 119: changed_prefs.mmu_model = changed_prefs.cpu_model; /* MMU enabled */
1.1 root 120:
121: init_m68k();
122:
123: return true;
124: }
125:
126:
127: /**
128: * Deinitialize 680x0 emulation
129: */
130: void Exit680x0(void)
131: {
132: memory_uninit();
133:
134: free(table68k);
135: table68k = NULL;
136: }
137:
1.1.1.6 root 138:
139: /**
140: * Execute a 'NOP' opcode (increment PC by 2 bytes and take care
141: * of prefetch at the CPU level depending on the current CPU mode)
142: * This is used to return from Gemdos / Natfeats interception, by ignoring
143: * the intercepted opcode and executing a NOP instead once the work has been done.
144: */
145: static void CpuDoNOP ( void )
146: {
147: (*cpufunctbl[0X4E71])(0x4E71);
148: }
149:
150:
1.1 root 151: /**
1.1.1.7 ! root 152: * Check whether PC is currently in ROM cartridge space - used
! 153: * to test whether our "illegal" Hatari opcodes should be handled
! 154: * or whether they are just "normal" illegal opcodes.
! 155: */
! 156: static bool is_cart_pc(void)
! 157: {
! 158: Uint32 pc = M68000_GetPC();
! 159:
! 160: if (ConfigureParams.System.bAddressSpace24 || (pc >> 24) == 0xff)
! 161: {
! 162: pc &= 0x00ffffff; /* Mask to 24-bit address */
! 163: }
! 164:
! 165: return pc >= 0xfa0000 && pc < 0xfc0000;
! 166: }
! 167:
! 168:
! 169: /**
1.1 root 170: * This function will be called at system init by the cartridge routine
171: * (after gemdos init, before booting floppies).
172: * The GEMDOS vector (#$84) is setup and we also initialize the connected
173: * drive mask and Line-A variables (for an extended VDI resolution) from here.
174: */
1.1.1.7 ! root 175: uae_u32 REGPARAM3 OpCode_SysInit(uae_u32 opcode)
1.1 root 176: {
1.1.1.7 ! root 177: if (is_cart_pc())
1.1 root 178: {
1.1.1.7 ! root 179: /* Add any drives mapped by TOS in the interim */
! 180: ConnectedDriveMask |= STMemory_ReadLong(0x4c2);
! 181: /* Initialize the connected drive mask */
! 182: STMemory_WriteLong(0x4c2, ConnectedDriveMask);
! 183:
1.1 root 184: /* Init on boot - see cart.c */
185: GemDOS_Boot();
186:
187: /* Update LineA for extended VDI res
188: * D0: LineA base, A1: Font base
189: */
190: VDI_LineA(regs.regs[0], regs.regs[9]);
1.1.1.7 ! root 191:
! 192: CpuDoNOP ();
! 193: }
! 194: else
! 195: {
! 196: LOG_TRACE(TRACE_OS_GEMDOS | TRACE_OS_BASE | TRACE_OS_VDI | TRACE_OS_AES,
! 197: "SYSINIT opcode invoked outside of cartridge space\n");
! 198: /* illegal instruction */
! 199: op_illg(opcode);
! 200: fill_prefetch();
1.1 root 201: }
202:
1.1.1.3 root 203: return 4 * CYCLE_UNIT / 2;
1.1 root 204: }
205:
206:
207: /**
208: * Intercept GEMDOS calls.
209: * Used for GEMDOS HD emulation (see gemdos.c).
210: */
1.1.1.7 ! root 211: uae_u32 REGPARAM3 OpCode_GemDos(uae_u32 opcode)
1.1 root 212: {
1.1.1.7 ! root 213: if (is_cart_pc())
! 214: {
! 215: GemDOS_OpCode(); /* handler code in gemdos.c */
! 216: CpuDoNOP();
! 217: }
! 218: else
! 219: {
! 220: LOG_TRACE(TRACE_OS_GEMDOS, "GEMDOS opcode invoked outside of cartridge space\n");
! 221: /* illegal instruction */
! 222: op_illg(opcode);
! 223: fill_prefetch();
! 224: }
1.1 root 225:
1.1.1.3 root 226: return 4 * CYCLE_UNIT / 2;
1.1 root 227: }
228:
229:
230: /**
231: * This is called after completion of each VDI call
232: */
1.1.1.7 ! root 233: uae_u32 REGPARAM3 OpCode_VDI(uae_u32 opcode)
1.1 root 234: {
1.1.1.4 root 235: /* this is valid only after VDI trap, called from cartridge code */
1.1.1.7 ! root 236: if (VDI_OldPC && is_cart_pc())
1.1.1.4 root 237: {
238: VDI_Complete();
239:
240: /* Set PC back to where originated from to continue instruction decoding */
241: m68k_setpc(VDI_OldPC);
242: VDI_OldPC = 0;
243: }
244: else
245: {
1.1.1.7 ! root 246: LOG_TRACE(TRACE_OS_VDI, "VDI opcode invoked outside of cartridge space\n");
1.1.1.4 root 247: /* illegal instruction */
248: op_illg(opcode);
249: }
1.1 root 250:
1.1.1.6 root 251: fill_prefetch();
1.1.1.3 root 252: return 4 * CYCLE_UNIT / 2;
1.1 root 253: }
1.1.1.4 root 254:
255:
256: /**
257: * Emulator Native Features ID opcode interception.
258: */
1.1.1.7 ! root 259: uae_u32 REGPARAM3 OpCode_NatFeat_ID(uae_u32 opcode)
1.1.1.4 root 260: {
261: Uint32 stack = Regs[REG_A7] + SIZE_LONG; /* skip return address */
262:
1.1.1.7 ! root 263: if (NatFeat_ID(stack, &(Regs[REG_D0])))
! 264: {
1.1.1.6 root 265: CpuDoNOP ();
1.1.1.4 root 266: }
267: return 4 * CYCLE_UNIT / 2;
268: }
269:
270: /**
271: * Emulator Native Features call opcode interception.
272: */
1.1.1.7 ! root 273: uae_u32 REGPARAM3 OpCode_NatFeat_Call(uae_u32 opcode)
1.1.1.4 root 274: {
275: Uint32 stack = Regs[REG_A7] + SIZE_LONG; /* skip return address */
276: Uint16 SR = M68000_GetSR();
277: bool super;
278:
279: super = ((SR & SR_SUPERMODE) == SR_SUPERMODE);
1.1.1.7 ! root 280: if (NatFeat_Call(stack, super, &(Regs[REG_D0])))
! 281: {
1.1.1.6 root 282: CpuDoNOP ();
1.1.1.4 root 283: }
284: return 4 * CYCLE_UNIT / 2;
285: }
1.1.1.6 root 286:
287:
1.1.1.7 ! root 288: TCHAR* buf_out (TCHAR *buffer, int *bufsize, const TCHAR *format, ...)
! 289: {
! 290: va_list parms;
! 291:
! 292: if (buffer == NULL)
! 293: {
! 294: return NULL;
! 295: }
! 296:
! 297: va_start (parms, format);
! 298: vsnprintf (buffer, (*bufsize) - 1, format, parms);
! 299: va_end (parms);
! 300: *bufsize -= _tcslen (buffer);
1.1.1.6 root 301:
1.1.1.7 ! root 302: return buffer + _tcslen (buffer);
! 303: }
! 304:
! 305: void error_log(const TCHAR *format, ...)
! 306: {
! 307: va_list parms;
1.1.1.6 root 308:
1.1.1.7 ! root 309: va_start(parms, format);
! 310: vfprintf(stderr, format, parms);
! 311: va_end(parms);
1.1.1.6 root 312:
1.1.1.7 ! root 313: if (format[strlen(format) - 1] != '\n')
! 314: {
! 315: fputc('\n', stderr);
! 316: }
1.1.1.6 root 317: }
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