1 /* armcopro.c -- co-processor interface: ARM6 Instruction Emulator.
2 Copyright (C) 1994 Advanced RISC Machines Ltd.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 extern unsigned ARMul_CoProInit(ARMul_State *state) ;
21 extern void ARMul_CoProExit(ARMul_State *state) ;
22 extern void ARMul_CoProAttach(ARMul_State *state, unsigned number,
23 ARMul_CPInits *init, ARMul_CPExits *exit,
24 ARMul_LDCs *ldc, ARMul_STCs *stc,
25 ARMul_MRCs *mrc, ARMul_MCRs *mcr,
27 ARMul_CPReads *read, ARMul_CPWrites *write) ;
28 extern void ARMul_CoProDetach(ARMul_State *state, unsigned number) ;
31 /***************************************************************************\
32 * Dummy Co-processors *
33 \***************************************************************************/
35 static unsigned NoCoPro3R(ARMul_State *state,unsigned,ARMword) ;
36 static unsigned NoCoPro4R(ARMul_State *state,unsigned,ARMword,ARMword) ;
37 static unsigned NoCoPro4W(ARMul_State *state,unsigned,ARMword,ARMword *) ;
39 /***************************************************************************\
40 * Define Co-Processor instruction handlers here *
41 \***************************************************************************/
43 /* Here's ARMulator's MMU definition. A few things to note:
44 1) it has eight registers, but only two are defined.
45 2) you can only access its registers with MCR and MRC.
46 3) MMU Register 0 (ID) returns 0x41440110
47 4) Register 1 only has 4 bits defined. Bits 0 to 3 are unused, bit 4
48 controls 32/26 bit program space, bit 5 controls 32/26 bit data space,
49 bit 6 controls late abort timimg and bit 7 controls big/little endian.
52 static ARMword MMUReg[8] ;
54 static unsigned MMUInit(ARMul_State *state)
55 {MMUReg[1] = state->prog32Sig << 4 |
56 state->data32Sig << 5 |
57 state->lateabtSig << 6 |
58 state->bigendSig << 7 ;
59 ARMul_ConsolePrint (state, ", MMU present") ;
63 static unsigned MMUMRC(ARMul_State *state, unsigned type, ARMword instr,ARMword *value)
64 {int reg = BITS(16,19) & 7 ;
69 *value = MMUReg[reg] ;
73 static unsigned MMUMCR(ARMul_State *state, unsigned type, ARMword instr, ARMword value)
74 {int reg = BITS(16,19) & 7 ;
78 state->prog32Sig = value >> 4 & 1 ;
79 state->data32Sig = value >> 5 & 1 ;
80 state->lateabtSig = value >> 6 & 1 ;
81 state->bigendSig = value >> 7 & 1 ;
82 state->Emulate = TRUE ; /* force ARMulator to notice these now !*/
88 static unsigned MMURead(ARMul_State *state, unsigned reg, ARMword *value)
92 *value = MMUReg[reg] ;
96 static unsigned MMUWrite(ARMul_State *state, unsigned reg, ARMword value)
100 state->prog32Sig = value >> 4 & 1 ;
101 state->data32Sig = value >> 5 & 1 ;
102 state->lateabtSig = value >> 6 & 1 ;
103 state->bigendSig = value >> 7 & 1 ;
104 state->Emulate = TRUE ; /* force ARMulator to notice these now !*/
110 /* What follows is the Validation Suite Coprocessor. It uses two
111 co-processor numbers (4 and 5) and has the follwing functionality.
112 Sixteen registers. Both co-processor nuimbers can be used in an MCR and
113 MRC to access these registers. CP 4 can LDC and STC to and from the
114 registers. CP 4 and CP 5 CDP 0 will busy wait for the number of cycles
115 specified by a CP register. CP 5 CDP 1 issues a FIQ after a number of
116 cycles (specified in a CP register), CDP 2 issues an IRQW in the same
117 way, CDP 3 and 4 turn of the FIQ and IRQ source, and CDP 5 stores a 32
118 bit time value in a CP register (actually it's the total number of N, S,
121 static ARMword ValReg[16] ;
123 static unsigned ValLDC(ARMul_State *state, unsigned type,
124 ARMword instr, ARMword data)
125 {static unsigned words ;
127 if (type != ARMul_DATA) {
131 if (BIT(22)) { /* it's a long access, get two words */
132 ValReg[BITS(12,15)] = data ;
138 else { /* get just one word */
139 ValReg[BITS(12,15)] = data ;
144 static unsigned ValSTC(ARMul_State *state, unsigned type,
145 ARMword instr, ARMword *data)
146 {static unsigned words ;
148 if (type != ARMul_DATA) {
152 if (BIT(22)) { /* it's a long access, get two words */
153 *data = ValReg[BITS(12,15)] ;
159 else { /* get just one word */
160 *data = ValReg[BITS(12,15)] ;
165 static unsigned ValMRC(ARMul_State *state, unsigned type, ARMword instr,ARMword *value)
167 *value = ValReg[BITS(16,19)] ;
171 static unsigned ValMCR(ARMul_State *state, unsigned type, ARMword instr, ARMword value)
173 ValReg[BITS(16,19)] = value ;
177 static unsigned ValCDP(ARMul_State *state, unsigned type, ARMword instr)
179 static unsigned long finish = 0 ;
182 howlong = ValReg[BITS(0,3)] ;
183 if (BITS(20,23)==0) {
184 if (type == ARMul_FIRST) { /* First cycle of a busy wait */
185 finish = ARMul_Time(state) + howlong ;
191 else if (type == ARMul_BUSY) {
192 if (ARMul_Time(state) >= finish)
201 static unsigned DoAFIQ(ARMul_State *state)
202 {state->NfiqSig = LOW ;
207 static unsigned DoAIRQ(ARMul_State *state)
208 {state->NirqSig = LOW ;
213 static unsigned IntCDP(ARMul_State *state, unsigned type, ARMword instr)
214 {static unsigned long finish ;
217 howlong = ValReg[BITS(0,3)] ;
218 switch((int)BITS(20,23)) {
219 case 0 : if (type == ARMul_FIRST) { /* First cycle of a busy wait */
220 finish = ARMul_Time(state) + howlong ;
226 else if (type == ARMul_BUSY) {
227 if (ARMul_Time(state) >= finish)
233 case 1 : if (howlong == 0)
234 ARMul_Abort(state,ARMul_FIQV) ;
236 ARMul_ScheduleEvent(state,howlong,DoAFIQ) ;
238 case 2 : if (howlong == 0)
239 ARMul_Abort(state,ARMul_IRQV) ;
241 ARMul_ScheduleEvent(state,howlong,DoAIRQ) ;
243 case 3 : state->NfiqSig = HIGH ;
246 case 4 : state->NirqSig = HIGH ;
249 case 5 : ValReg[BITS(0,3)] = ARMul_Time(state) ;
255 /***************************************************************************\
256 * Install co-processor instruction handlers in this routine *
257 \***************************************************************************/
259 unsigned ARMul_CoProInit(ARMul_State *state)
260 {register unsigned i ;
262 for (i = 0 ; i < 16 ; i++) /* initialise tham all first */
263 ARMul_CoProDetach(state, i) ;
265 /* Install CoPro Instruction handlers here
267 ARMul_CoProAttach(state, CP Number, Init routine, Exit routine
268 LDC routine, STC routine, MRC routine, MCR routine,
269 CDP routine, Read Reg routine, Write Reg routine) ;
272 ARMul_CoProAttach(state, 4, NULL, NULL,
273 ValLDC, ValSTC, ValMRC, ValMCR,
274 ValCDP, NULL, NULL) ;
276 ARMul_CoProAttach(state, 5, NULL, NULL,
277 NULL, NULL, ValMRC, ValMCR,
278 IntCDP, NULL, NULL) ;
280 ARMul_CoProAttach(state, 15, MMUInit, NULL,
281 NULL, NULL, MMUMRC, MMUMCR,
282 NULL, MMURead, MMUWrite) ;
285 /* No handlers below here */
287 for (i = 0 ; i < 16 ; i++) /* Call all the initialisation routines */
288 if (state->CPInit[i])
289 (state->CPInit[i])(state) ;
293 /***************************************************************************\
294 * Install co-processor finalisation routines in this routine *
295 \***************************************************************************/
297 void ARMul_CoProExit(ARMul_State *state)
298 {register unsigned i ;
300 for (i = 0 ; i < 16 ; i++)
301 if (state->CPExit[i])
302 (state->CPExit[i])(state) ;
303 for (i = 0 ; i < 16 ; i++) /* Detach all handlers */
304 ARMul_CoProDetach(state, i) ;
307 /***************************************************************************\
308 * Routines to hook Co-processors into ARMulator *
309 \***************************************************************************/
311 void ARMul_CoProAttach(ARMul_State *state, unsigned number,
312 ARMul_CPInits *init, ARMul_CPExits *exit,
313 ARMul_LDCs *ldc, ARMul_STCs *stc,
314 ARMul_MRCs *mrc, ARMul_MCRs *mcr, ARMul_CDPs *cdp,
315 ARMul_CPReads *read, ARMul_CPWrites *write)
317 state->CPInit[number] = init ;
319 state->CPExit[number] = exit ;
321 state->LDC[number] = ldc ;
323 state->STC[number] = stc ;
325 state->MRC[number] = mrc ;
327 state->MCR[number] = mcr ;
329 state->CDP[number] = cdp ;
331 state->CPRead[number] = read ;
333 state->CPWrite[number] = write ;
336 void ARMul_CoProDetach(ARMul_State *state, unsigned number)
337 {ARMul_CoProAttach(state, number, NULL, NULL,
338 NoCoPro4R, NoCoPro4W, NoCoPro4W, NoCoPro4R,
339 NoCoPro3R, NULL, NULL) ;
340 state->CPInit[number] = NULL ;
341 state->CPExit[number] = NULL ;
342 state->CPRead[number] = NULL ;
343 state->CPWrite[number] = NULL ;
346 /***************************************************************************\
347 * There is no CoPro around, so Undefined Instruction trap *
348 \***************************************************************************/
350 static unsigned NoCoPro3R(ARMul_State *state,unsigned a,ARMword b)
351 {return(ARMul_CANT) ;}
353 static unsigned NoCoPro4R(ARMul_State *state, unsigned a,ARMword b,ARMword c)
354 {return(ARMul_CANT) ;}
356 static unsigned NoCoPro4W(ARMul_State *state, unsigned a,ARMword b,ARMword *c)
357 {return(ARMul_CANT) ;}