2 * $Id: sh4.c,v 1.4 2007-10-04 08:47:52 nkeynes Exp $
4 * SH4 parent module for all CPU modes and SH4 peripheral
7 * Copyright (c) 2005 Nathan Keynes.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
20 #define MODULE sh4_module
23 #include "sh4/sh4core.h"
24 #include "sh4/sh4mmio.h"
30 #define EXV_EXCEPTION 0x100 /* General exception vector */
31 #define EXV_TLBMISS 0x400 /* TLB-miss exception vector */
32 #define EXV_INTERRUPT 0x600 /* External interrupt vector */
34 void sh4_init( void );
35 void sh4_reset( void );
36 void sh4_start( void );
37 void sh4_stop( void );
38 void sh4_save_state( FILE *f );
39 int sh4_load_state( FILE *f );
41 uint32_t sh4_run_slice( uint32_t );
42 uint32_t sh4_xlat_run_slice( uint32_t );
44 struct dreamcast_module sh4_module = { "SH4", sh4_init, sh4_reset,
45 NULL, sh4_run_slice, sh4_stop,
46 sh4_save_state, sh4_load_state };
48 struct sh4_registers sh4r;
49 struct breakpoint_struct sh4_breakpoints[MAX_BREAKPOINTS];
50 int sh4_breakpoint_count = 0;
51 extern char *sh4_main_ram;
53 void sh4_set_use_xlat( gboolean use )
58 sh4_module.run_time_slice = sh4_xlat_run_slice;
60 sh4_module.run_time_slice = sh4_run_slice;
66 register_io_regions( mmio_list_sh4mmio );
67 sh4_main_ram = mem_get_region_by_name(MEM_REGION_MAIN);
74 /* zero everything out, for the sake of having a consistent state. */
75 memset( &sh4r, 0, sizeof(sh4r) );
77 /* Resume running if we were halted */
78 sh4r.sh4_state = SH4_STATE_RUNNING;
81 sh4r.new_pc= 0xA0000002;
82 sh4r.vbr = 0x00000000;
83 sh4r.fpscr = 0x00040001;
85 sh4r.fr_bank = &sh4r.fr[0][0];
87 /* Mem reset will do this, but if we want to reset _just_ the SH4... */
88 MMIO_WRITE( MMU, EXPEVT, EXC_POWER_RESET );
90 /* Peripheral modules */
104 void sh4_save_state( FILE *f )
106 if( sh4_module.run_time_slice == sh4_xlat_run_slice ) {
107 /* If we were running with the translator, update new_pc and in_delay_slot */
108 sh4r.new_pc = sh4r.pc+2;
109 sh4r.in_delay_slot = FALSE;
112 fwrite( &sh4r, sizeof(sh4r), 1, f );
114 INTC_save_state( f );
116 SCIF_save_state( f );
119 int sh4_load_state( FILE * f )
121 fread( &sh4r, sizeof(sh4r), 1, f );
122 sh4r.fr_bank = &sh4r.fr[(sh4r.fpscr&FPSCR_FR)>>21][0]; // Fixup internal FR pointer
124 INTC_load_state( f );
126 return SCIF_load_state( f );
130 void sh4_set_breakpoint( uint32_t pc, int type )
132 sh4_breakpoints[sh4_breakpoint_count].address = pc;
133 sh4_breakpoints[sh4_breakpoint_count].type = type;
134 sh4_breakpoint_count++;
137 gboolean sh4_clear_breakpoint( uint32_t pc, int type )
141 for( i=0; i<sh4_breakpoint_count; i++ ) {
142 if( sh4_breakpoints[i].address == pc &&
143 sh4_breakpoints[i].type == type ) {
144 while( ++i < sh4_breakpoint_count ) {
145 sh4_breakpoints[i-1].address = sh4_breakpoints[i].address;
146 sh4_breakpoints[i-1].type = sh4_breakpoints[i].type;
148 sh4_breakpoint_count--;
155 int sh4_get_breakpoint( uint32_t pc )
158 for( i=0; i<sh4_breakpoint_count; i++ ) {
159 if( sh4_breakpoints[i].address == pc )
160 return sh4_breakpoints[i].type;
165 void sh4_set_pc( int pc )
172 /******************************* Support methods ***************************/
174 static void sh4_switch_banks( )
178 memcpy( tmp, sh4r.r, sizeof(uint32_t)*8 );
179 memcpy( sh4r.r, sh4r.r_bank, sizeof(uint32_t)*8 );
180 memcpy( sh4r.r_bank, tmp, sizeof(uint32_t)*8 );
183 void sh4_write_sr( uint32_t newval )
185 if( (newval ^ sh4r.sr) & SR_RB )
188 sh4r.t = (newval&SR_T) ? 1 : 0;
189 sh4r.s = (newval&SR_S) ? 1 : 0;
190 sh4r.m = (newval&SR_M) ? 1 : 0;
191 sh4r.q = (newval&SR_Q) ? 1 : 0;
195 uint32_t sh4_read_sr( void )
197 /* synchronize sh4r.sr with the various bitflags */
198 sh4r.sr &= SR_MQSTMASK;
199 if( sh4r.t ) sh4r.sr |= SR_T;
200 if( sh4r.s ) sh4r.sr |= SR_S;
201 if( sh4r.m ) sh4r.sr |= SR_M;
202 if( sh4r.q ) sh4r.sr |= SR_Q;
208 #define RAISE( x, v ) do{ \
209 if( sh4r.vbr == 0 ) { \
210 ERROR( "%08X: VBR not initialized while raising exception %03X, halting", sh4r.pc, x ); \
211 dreamcast_stop(); return FALSE; \
213 sh4r.spc = sh4r.pc; \
214 sh4r.ssr = sh4_read_sr(); \
215 sh4r.sgr = sh4r.r[15]; \
216 MMIO_WRITE(MMU,EXPEVT,x); \
217 sh4r.pc = sh4r.vbr + v; \
218 sh4r.new_pc = sh4r.pc + 2; \
219 sh4_write_sr( sh4r.ssr |SR_MD|SR_BL|SR_RB ); \
220 if( sh4r.in_delay_slot ) { \
221 sh4r.in_delay_slot = 0; \
225 return TRUE; } while(0)
228 * Raise a general CPU exception for the specified exception code.
229 * (NOT for TRAPA or TLB exceptions)
231 gboolean sh4_raise_exception( int code )
233 RAISE( code, EXV_EXCEPTION );
236 gboolean sh4_raise_trap( int trap )
238 MMIO_WRITE( MMU, TRA, trap<<2 );
239 return sh4_raise_exception( EXC_TRAP );
242 gboolean sh4_raise_slot_exception( int normal_code, int slot_code ) {
243 if( sh4r.in_delay_slot ) {
244 return sh4_raise_exception(slot_code);
246 return sh4_raise_exception(normal_code);
250 gboolean sh4_raise_tlb_exception( int code )
252 RAISE( code, EXV_TLBMISS );
255 void sh4_accept_interrupt( void )
257 uint32_t code = intc_accept_interrupt();
258 sh4r.ssr = sh4_read_sr();
260 sh4r.sgr = sh4r.r[15];
261 sh4_write_sr( sh4r.ssr|SR_BL|SR_MD|SR_RB );
262 MMIO_WRITE( MMU, INTEVT, code );
263 sh4r.pc = sh4r.vbr + 0x600;
264 sh4r.new_pc = sh4r.pc + 2;
265 // WARN( "Accepting interrupt %03X, from %08X => %08X", code, sh4r.spc, sh4r.pc );
268 void signsat48( void )
270 if( ((int64_t)sh4r.mac) < (int64_t)0xFFFF800000000000LL )
271 sh4r.mac = 0xFFFF800000000000LL;
272 else if( ((int64_t)sh4r.mac) > (int64_t)0x00007FFFFFFFFFFFLL )
273 sh4r.mac = 0x00007FFFFFFFFFFFLL;
276 void sh4_fsca( uint32_t anglei, float *fr )
278 float angle = (((float)(anglei&0xFFFF))/65536.0) * 2 * M_PI;
285 if( MMIO_READ( CPG, STBCR ) & 0x80 ) {
286 sh4r.sh4_state = SH4_STATE_STANDBY;
288 sh4r.sh4_state = SH4_STATE_SLEEP;
293 * Compute the matrix tranform of fv given the matrix xf.
294 * Both fv and xf are word-swapped as per the sh4r.fr banks
296 void sh4_ftrv( float *target, float *xf )
298 float fv[4] = { target[1], target[0], target[3], target[2] };
299 target[1] = xf[1] * fv[0] + xf[5]*fv[1] +
300 xf[9]*fv[2] + xf[13]*fv[3];
301 target[0] = xf[0] * fv[0] + xf[4]*fv[1] +
302 xf[8]*fv[2] + xf[12]*fv[3];
303 target[3] = xf[3] * fv[0] + xf[7]*fv[1] +
304 xf[11]*fv[2] + xf[15]*fv[3];
305 target[2] = xf[2] * fv[0] + xf[6]*fv[1] +
306 xf[10]*fv[2] + xf[14]*fv[3];
.