lxdream 0.9.1| filename | src/sh4/sh4.c |
| changeset | 569:a1c49e1e8776 |
| prev | 566:59be465e5f01 |
| next | 571:9bc09948d0f2 |
| author | nkeynes |
| date | Fri Jan 04 11:54:17 2008 +0000 (15 years ago) |
| branch | lxdream-mmu |
| permissions | -rw-r--r-- |
| last change | Bring icache partially into line with the mmu, a little less slow with AT off now. |
| view | annotate | diff | log | raw |
1 /**
2 * $Id$
3 *
4 * SH4 parent module for all CPU modes and SH4 peripheral
5 * modules.
6 *
7 * Copyright (c) 2005 Nathan Keynes.
8 *
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.
13 *
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.
18 */
20 #define MODULE sh4_module
21 #include <math.h>
22 #include "dream.h"
23 #include "dreamcast.h"
24 #include "sh4/sh4core.h"
25 #include "sh4/sh4mmio.h"
26 #include "sh4/intc.h"
27 #include "sh4/xltcache.h"
28 #include "sh4/sh4stat.h"
29 #include "mem.h"
30 #include "clock.h"
31 #include "syscall.h"
33 void sh4_init( void );
34 void sh4_xlat_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 sh4ptr_t sh4_main_ram;
52 static gboolean sh4_use_translator = FALSE;
53 struct sh4_icache_struct sh4_icache = { NULL, -1, -1, 0 };
55 void sh4_set_use_xlat( gboolean use )
56 {
57 // No-op if the translator was not built
58 #ifdef SH4_TRANSLATOR
59 if( use ) {
60 xlat_cache_init();
61 sh4_x86_init();
62 sh4_module.run_time_slice = sh4_xlat_run_slice;
63 } else {
64 sh4_module.run_time_slice = sh4_run_slice;
65 }
66 sh4_use_translator = use;
67 #endif
68 }
70 void sh4_init(void)
71 {
72 register_io_regions( mmio_list_sh4mmio );
73 sh4_main_ram = mem_get_region_by_name(MEM_REGION_MAIN);
74 MMU_init();
75 sh4_reset();
76 }
78 void sh4_reset(void)
79 {
80 if( sh4_use_translator ) {
81 xlat_flush_cache();
82 }
84 /* zero everything out, for the sake of having a consistent state. */
85 memset( &sh4r, 0, sizeof(sh4r) );
87 /* Resume running if we were halted */
88 sh4r.sh4_state = SH4_STATE_RUNNING;
90 sh4r.pc = 0xA0000000;
91 sh4r.new_pc= 0xA0000002;
92 sh4r.vbr = 0x00000000;
93 sh4r.fpscr = 0x00040001;
94 sh4r.sr = 0x700000F0;
95 sh4r.fr_bank = &sh4r.fr[0][0];
97 /* Mem reset will do this, but if we want to reset _just_ the SH4... */
98 MMIO_WRITE( MMU, EXPEVT, EXC_POWER_RESET );
100 /* Peripheral modules */
101 CPG_reset();
102 INTC_reset();
103 MMU_reset();
104 TMU_reset();
105 SCIF_reset();
106 sh4_stats_reset();
107 }
109 void sh4_stop(void)
110 {
111 if( sh4_use_translator ) {
112 /* If we were running with the translator, update new_pc and in_delay_slot */
113 sh4r.new_pc = sh4r.pc+2;
114 sh4r.in_delay_slot = FALSE;
115 }
117 }
119 void sh4_save_state( FILE *f )
120 {
121 if( sh4_use_translator ) {
122 /* If we were running with the translator, update new_pc and in_delay_slot */
123 sh4r.new_pc = sh4r.pc+2;
124 sh4r.in_delay_slot = FALSE;
125 }
127 fwrite( &sh4r, sizeof(sh4r), 1, f );
128 MMU_save_state( f );
129 INTC_save_state( f );
130 TMU_save_state( f );
131 SCIF_save_state( f );
132 }
134 int sh4_load_state( FILE * f )
135 {
136 if( sh4_use_translator ) {
137 xlat_flush_cache();
138 }
139 fread( &sh4r, sizeof(sh4r), 1, f );
140 sh4r.fr_bank = &sh4r.fr[(sh4r.fpscr&FPSCR_FR)>>21][0]; // Fixup internal FR pointer
141 MMU_load_state( f );
142 INTC_load_state( f );
143 TMU_load_state( f );
144 return SCIF_load_state( f );
145 }
148 void sh4_set_breakpoint( uint32_t pc, breakpoint_type_t type )
149 {
150 sh4_breakpoints[sh4_breakpoint_count].address = pc;
151 sh4_breakpoints[sh4_breakpoint_count].type = type;
152 sh4_breakpoint_count++;
153 }
155 gboolean sh4_clear_breakpoint( uint32_t pc, breakpoint_type_t type )
156 {
157 int i;
159 for( i=0; i<sh4_breakpoint_count; i++ ) {
160 if( sh4_breakpoints[i].address == pc &&
161 sh4_breakpoints[i].type == type ) {
162 while( ++i < sh4_breakpoint_count ) {
163 sh4_breakpoints[i-1].address = sh4_breakpoints[i].address;
164 sh4_breakpoints[i-1].type = sh4_breakpoints[i].type;
165 }
166 sh4_breakpoint_count--;
167 return TRUE;
168 }
169 }
170 return FALSE;
171 }
173 int sh4_get_breakpoint( uint32_t pc )
174 {
175 int i;
176 for( i=0; i<sh4_breakpoint_count; i++ ) {
177 if( sh4_breakpoints[i].address == pc )
178 return sh4_breakpoints[i].type;
179 }
180 return 0;
181 }
183 void sh4_set_pc( int pc )
184 {
185 sh4r.pc = pc;
186 sh4r.new_pc = pc+2;
187 }
190 /******************************* Support methods ***************************/
192 static void sh4_switch_banks( )
193 {
194 uint32_t tmp[8];
196 memcpy( tmp, sh4r.r, sizeof(uint32_t)*8 );
197 memcpy( sh4r.r, sh4r.r_bank, sizeof(uint32_t)*8 );
198 memcpy( sh4r.r_bank, tmp, sizeof(uint32_t)*8 );
199 }
201 void sh4_write_sr( uint32_t newval )
202 {
203 if( (newval ^ sh4r.sr) & SR_RB )
204 sh4_switch_banks();
205 sh4r.sr = newval;
206 sh4r.t = (newval&SR_T) ? 1 : 0;
207 sh4r.s = (newval&SR_S) ? 1 : 0;
208 sh4r.m = (newval&SR_M) ? 1 : 0;
209 sh4r.q = (newval&SR_Q) ? 1 : 0;
210 intc_mask_changed();
211 }
213 uint32_t sh4_read_sr( void )
214 {
215 /* synchronize sh4r.sr with the various bitflags */
216 sh4r.sr &= SR_MQSTMASK;
217 if( sh4r.t ) sh4r.sr |= SR_T;
218 if( sh4r.s ) sh4r.sr |= SR_S;
219 if( sh4r.m ) sh4r.sr |= SR_M;
220 if( sh4r.q ) sh4r.sr |= SR_Q;
221 return sh4r.sr;
222 }
226 #define RAISE( x, v ) do{ \
227 if( sh4r.vbr == 0 ) { \
228 ERROR( "%08X: VBR not initialized while raising exception %03X, halting", sh4r.pc, x ); \
229 dreamcast_stop(); return FALSE; \
230 } else { \
231 sh4r.spc = sh4r.pc; \
232 sh4r.ssr = sh4_read_sr(); \
233 sh4r.sgr = sh4r.r[15]; \
234 MMIO_WRITE(MMU,EXPEVT,x); \
235 sh4r.pc = sh4r.vbr + v; \
236 sh4r.new_pc = sh4r.pc + 2; \
237 sh4_write_sr( sh4r.ssr |SR_MD|SR_BL|SR_RB ); \
238 if( sh4r.in_delay_slot ) { \
239 sh4r.in_delay_slot = 0; \
240 sh4r.spc -= 2; \
241 } \
242 } \
243 return TRUE; } while(0)
245 /**
246 * Raise a general CPU exception for the specified exception code.
247 * (NOT for TRAPA or TLB exceptions)
248 */
249 gboolean sh4_raise_exception( int code )
250 {
251 RAISE( code, EXV_EXCEPTION );
252 }
254 /**
255 * Raise a CPU reset exception with the specified exception code.
256 */
257 gboolean sh4_raise_reset( int code )
258 {
259 // FIXME: reset modules as per "manual reset"
260 sh4_reset();
261 MMIO_WRITE(MMU,EXPEVT,code);
262 sh4r.vbr = 0;
263 sh4r.pc = 0xA0000000;
264 sh4r.new_pc = sh4r.pc + 2;
265 sh4_write_sr( (sh4r.sr|SR_MD|SR_BL|SR_RB|SR_IMASK)
266 &(~SR_FD) );
267 }
269 gboolean sh4_raise_trap( int trap )
270 {
271 MMIO_WRITE( MMU, TRA, trap<<2 );
272 return sh4_raise_exception( EXC_TRAP );
273 }
275 gboolean sh4_raise_slot_exception( int normal_code, int slot_code ) {
276 if( sh4r.in_delay_slot ) {
277 return sh4_raise_exception(slot_code);
278 } else {
279 return sh4_raise_exception(normal_code);
280 }
281 }
283 gboolean sh4_raise_tlb_exception( int code )
284 {
285 RAISE( code, EXV_TLBMISS );
286 }
288 void sh4_accept_interrupt( void )
289 {
290 uint32_t code = intc_accept_interrupt();
291 sh4r.ssr = sh4_read_sr();
292 sh4r.spc = sh4r.pc;
293 sh4r.sgr = sh4r.r[15];
294 sh4_write_sr( sh4r.ssr|SR_BL|SR_MD|SR_RB );
295 MMIO_WRITE( MMU, INTEVT, code );
296 sh4r.pc = sh4r.vbr + 0x600;
297 sh4r.new_pc = sh4r.pc + 2;
298 // WARN( "Accepting interrupt %03X, from %08X => %08X", code, sh4r.spc, sh4r.pc );
299 }
301 void signsat48( void )
302 {
303 if( ((int64_t)sh4r.mac) < (int64_t)0xFFFF800000000000LL )
304 sh4r.mac = 0xFFFF800000000000LL;
305 else if( ((int64_t)sh4r.mac) > (int64_t)0x00007FFFFFFFFFFFLL )
306 sh4r.mac = 0x00007FFFFFFFFFFFLL;
307 }
309 void sh4_fsca( uint32_t anglei, float *fr )
310 {
311 float angle = (((float)(anglei&0xFFFF))/65536.0) * 2 * M_PI;
312 *fr++ = cosf(angle);
313 *fr = sinf(angle);
314 }
316 void sh4_sleep(void)
317 {
318 if( MMIO_READ( CPG, STBCR ) & 0x80 ) {
319 sh4r.sh4_state = SH4_STATE_STANDBY;
320 } else {
321 sh4r.sh4_state = SH4_STATE_SLEEP;
322 }
323 }
325 /**
326 * Compute the matrix tranform of fv given the matrix xf.
327 * Both fv and xf are word-swapped as per the sh4r.fr banks
328 */
329 void sh4_ftrv( float *target, float *xf )
330 {
331 float fv[4] = { target[1], target[0], target[3], target[2] };
332 target[1] = xf[1] * fv[0] + xf[5]*fv[1] +
333 xf[9]*fv[2] + xf[13]*fv[3];
334 target[0] = xf[0] * fv[0] + xf[4]*fv[1] +
335 xf[8]*fv[2] + xf[12]*fv[3];
336 target[3] = xf[3] * fv[0] + xf[7]*fv[1] +
337 xf[11]*fv[2] + xf[15]*fv[3];
338 target[2] = xf[2] * fv[0] + xf[6]*fv[1] +
339 xf[10]*fv[2] + xf[14]*fv[3];
340 }
.