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Full support for Ginger Console
[linux-ginger.git] / arch / powerpc / kernel / head_booke.h
blob50504ae39cb71400d9e84c7688edbe83ab5e4c74
1 #ifndef __HEAD_BOOKE_H__
2 #define __HEAD_BOOKE_H__
3
4 /*
5 * Macros used for common Book-e exception handling
6 */
7
8 #define SET_IVOR(vector_number, vector_label) \
9 li r26,vector_label@l; \
10 mtspr SPRN_IVOR##vector_number,r26; \
11 sync
12
13 #if (THREAD_SHIFT < 15)
14 #define ALLOC_STACK_FRAME(reg, val) \
15 addi reg,reg,val
16 #else
17 #define ALLOC_STACK_FRAME(reg, val) \
18 addis reg,reg,val@ha; \
19 addi reg,reg,val@l
20 #endif
21
22 #define NORMAL_EXCEPTION_PROLOG \
23 mtspr SPRN_SPRG_WSCRATCH0,r10;/* save two registers to work with */\
24 mtspr SPRN_SPRG_WSCRATCH1,r11; \
25 mtspr SPRN_SPRG_WSCRATCH2,r1; \
26 mfcr r10; /* save CR in r10 for now */\
27 mfspr r11,SPRN_SRR1; /* check whether user or kernel */\
28 andi. r11,r11,MSR_PR; \
29 beq 1f; \
30 mfspr r1,SPRN_SPRG_THREAD; /* if from user, start at top of */\
31 lwz r1,THREAD_INFO-THREAD(r1); /* this thread's kernel stack */\
32 ALLOC_STACK_FRAME(r1, THREAD_SIZE); \
33 1: subi r1,r1,INT_FRAME_SIZE; /* Allocate an exception frame */\
34 mr r11,r1; \
35 stw r10,_CCR(r11); /* save various registers */\
36 stw r12,GPR12(r11); \
37 stw r9,GPR9(r11); \
38 mfspr r10,SPRN_SPRG_RSCRATCH0; \
39 stw r10,GPR10(r11); \
40 mfspr r12,SPRN_SPRG_RSCRATCH1; \
41 stw r12,GPR11(r11); \
42 mflr r10; \
43 stw r10,_LINK(r11); \
44 mfspr r10,SPRN_SPRG_RSCRATCH2; \
45 mfspr r12,SPRN_SRR0; \
46 stw r10,GPR1(r11); \
47 mfspr r9,SPRN_SRR1; \
48 stw r10,0(r11); \
49 rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
50 stw r0,GPR0(r11); \
51 SAVE_4GPRS(3, r11); \
52 SAVE_2GPRS(7, r11)
53
54 /* To handle the additional exception priority levels on 40x and Book-E
55 * processors we allocate a stack per additional priority level.
56 *
57 * On 40x critical is the only additional level
58 * On 44x/e500 we have critical and machine check
59 * On e200 we have critical and debug (machine check occurs via critical)
60 *
61 * Additionally we reserve a SPRG for each priority level so we can free up a
62 * GPR to use as the base for indirect access to the exception stacks. This
63 * is necessary since the MMU is always on, for Book-E parts, and the stacks
64 * are offset from KERNELBASE.
65 *
66 * There is some space optimization to be had here if desired. However
67 * to allow for a common kernel with support for debug exceptions either
68 * going to critical or their own debug level we aren't currently
69 * providing configurations that micro-optimize space usage.
70 */
71
72 #define MC_STACK_BASE mcheckirq_ctx
73 #define CRIT_STACK_BASE critirq_ctx
74
75 /* only on e500mc/e200 */
76 #define DBG_STACK_BASE dbgirq_ctx
77
78 #define EXC_LVL_FRAME_OVERHEAD (THREAD_SIZE - INT_FRAME_SIZE - EXC_LVL_SIZE)
79
80 #ifdef CONFIG_SMP
81 #define BOOKE_LOAD_EXC_LEVEL_STACK(level) \
82 mfspr r8,SPRN_PIR; \
83 slwi r8,r8,2; \
84 addis r8,r8,level##_STACK_BASE@ha; \
85 lwz r8,level##_STACK_BASE@l(r8); \
86 addi r8,r8,EXC_LVL_FRAME_OVERHEAD;
87 #else
88 #define BOOKE_LOAD_EXC_LEVEL_STACK(level) \
89 lis r8,level##_STACK_BASE@ha; \
90 lwz r8,level##_STACK_BASE@l(r8); \
91 addi r8,r8,EXC_LVL_FRAME_OVERHEAD;
92 #endif
93
94 /*
95 * Exception prolog for critical/machine check exceptions. This is a
96 * little different from the normal exception prolog above since a
97 * critical/machine check exception can potentially occur at any point
98 * during normal exception processing. Thus we cannot use the same SPRG
99 * registers as the normal prolog above. Instead we use a portion of the
100 * critical/machine check exception stack at low physical addresses.
101 */
102 #define EXC_LEVEL_EXCEPTION_PROLOG(exc_level, exc_level_srr0, exc_level_srr1) \
103 mtspr SPRN_SPRG_WSCRATCH_##exc_level,r8; \
104 BOOKE_LOAD_EXC_LEVEL_STACK(exc_level);/* r8 points to the exc_level stack*/ \
105 stw r9,GPR9(r8); /* save various registers */\
106 mfcr r9; /* save CR in r9 for now */\
107 stw r10,GPR10(r8); \
108 stw r11,GPR11(r8); \
109 stw r9,_CCR(r8); /* save CR on stack */\
110 mfspr r10,exc_level_srr1; /* check whether user or kernel */\
111 andi. r10,r10,MSR_PR; \
112 mfspr r11,SPRN_SPRG_THREAD; /* if from user, start at top of */\
113 lwz r11,THREAD_INFO-THREAD(r11); /* this thread's kernel stack */\
114 addi r11,r11,EXC_LVL_FRAME_OVERHEAD; /* allocate stack frame */\
115 beq 1f; \
116 /* COMING FROM USER MODE */ \
117 stw r9,_CCR(r11); /* save CR */\
118 lwz r10,GPR10(r8); /* copy regs from exception stack */\
119 lwz r9,GPR9(r8); \
120 stw r10,GPR10(r11); \
121 lwz r10,GPR11(r8); \
122 stw r9,GPR9(r11); \
123 stw r10,GPR11(r11); \
124 b 2f; \
125 /* COMING FROM PRIV MODE */ \
126 1: lwz r9,TI_FLAGS-EXC_LVL_FRAME_OVERHEAD(r11); \
127 lwz r10,TI_PREEMPT-EXC_LVL_FRAME_OVERHEAD(r11); \
128 stw r9,TI_FLAGS-EXC_LVL_FRAME_OVERHEAD(r8); \
129 stw r10,TI_PREEMPT-EXC_LVL_FRAME_OVERHEAD(r8); \
130 lwz r9,TI_TASK-EXC_LVL_FRAME_OVERHEAD(r11); \
131 stw r9,TI_TASK-EXC_LVL_FRAME_OVERHEAD(r8); \
132 mr r11,r8; \
133 2: mfspr r8,SPRN_SPRG_RSCRATCH_##exc_level; \
134 stw r12,GPR12(r11); /* save various registers */\
135 mflr r10; \
136 stw r10,_LINK(r11); \
137 mfspr r12,SPRN_DEAR; /* save DEAR and ESR in the frame */\
138 stw r12,_DEAR(r11); /* since they may have had stuff */\
139 mfspr r9,SPRN_ESR; /* in them at the point where the */\
140 stw r9,_ESR(r11); /* exception was taken */\
141 mfspr r12,exc_level_srr0; \
142 stw r1,GPR1(r11); \
143 mfspr r9,exc_level_srr1; \
144 stw r1,0(r11); \
145 mr r1,r11; \
146 rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
147 stw r0,GPR0(r11); \
148 SAVE_4GPRS(3, r11); \
149 SAVE_2GPRS(7, r11)
150
151 #define CRITICAL_EXCEPTION_PROLOG \
152 EXC_LEVEL_EXCEPTION_PROLOG(CRIT, SPRN_CSRR0, SPRN_CSRR1)
153 #define DEBUG_EXCEPTION_PROLOG \
154 EXC_LEVEL_EXCEPTION_PROLOG(DBG, SPRN_DSRR0, SPRN_DSRR1)
155 #define MCHECK_EXCEPTION_PROLOG \
156 EXC_LEVEL_EXCEPTION_PROLOG(MC, SPRN_MCSRR0, SPRN_MCSRR1)
157
158 /*
159 * Exception vectors.
160 */
161 #define START_EXCEPTION(label) \
162 .align 5; \
163 label:
164
165 #define FINISH_EXCEPTION(func) \
166 bl transfer_to_handler_full; \
167 .long func; \
168 .long ret_from_except_full
169
170 #define EXCEPTION(n, label, hdlr, xfer) \
171 START_EXCEPTION(label); \
172 NORMAL_EXCEPTION_PROLOG; \
173 addi r3,r1,STACK_FRAME_OVERHEAD; \
174 xfer(n, hdlr)
175
176 #define CRITICAL_EXCEPTION(n, label, hdlr) \
177 START_EXCEPTION(label); \
178 CRITICAL_EXCEPTION_PROLOG; \
179 addi r3,r1,STACK_FRAME_OVERHEAD; \
180 EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
181 NOCOPY, crit_transfer_to_handler, \
182 ret_from_crit_exc)
183
184 #define MCHECK_EXCEPTION(n, label, hdlr) \
185 START_EXCEPTION(label); \
186 MCHECK_EXCEPTION_PROLOG; \
187 mfspr r5,SPRN_ESR; \
188 stw r5,_ESR(r11); \
189 addi r3,r1,STACK_FRAME_OVERHEAD; \
190 EXC_XFER_TEMPLATE(hdlr, n+4, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
191 NOCOPY, mcheck_transfer_to_handler, \
192 ret_from_mcheck_exc)
193
194 #define EXC_XFER_TEMPLATE(hdlr, trap, msr, copyee, tfer, ret) \
195 li r10,trap; \
196 stw r10,_TRAP(r11); \
197 lis r10,msr@h; \
198 ori r10,r10,msr@l; \
199 copyee(r10, r9); \
200 bl tfer; \
201 .long hdlr; \
202 .long ret
203
204 #define COPY_EE(d, s) rlwimi d,s,0,16,16
205 #define NOCOPY(d, s)
206
207 #define EXC_XFER_STD(n, hdlr) \
208 EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, NOCOPY, transfer_to_handler_full, \
209 ret_from_except_full)
210
211 #define EXC_XFER_LITE(n, hdlr) \
212 EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, NOCOPY, transfer_to_handler, \
213 ret_from_except)
214
215 #define EXC_XFER_EE(n, hdlr) \
216 EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, COPY_EE, transfer_to_handler_full, \
217 ret_from_except_full)
218
219 #define EXC_XFER_EE_LITE(n, hdlr) \
220 EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, COPY_EE, transfer_to_handler, \
221 ret_from_except)
222
223 /* Check for a single step debug exception while in an exception
224 * handler before state has been saved. This is to catch the case
225 * where an instruction that we are trying to single step causes
226 * an exception (eg ITLB/DTLB miss) and thus the first instruction of
227 * the exception handler generates a single step debug exception.
228 *
229 * If we get a debug trap on the first instruction of an exception handler,
230 * we reset the MSR_DE in the _exception handler's_ MSR (the debug trap is
231 * a critical exception, so we are using SPRN_CSRR1 to manipulate the MSR).
232 * The exception handler was handling a non-critical interrupt, so it will
233 * save (and later restore) the MSR via SPRN_CSRR1, which will still have
234 * the MSR_DE bit set.
235 */
236 #define DEBUG_DEBUG_EXCEPTION \
237 START_EXCEPTION(DebugDebug); \
238 DEBUG_EXCEPTION_PROLOG; \
239 \
240 /* \
241 * If there is a single step or branch-taken exception in an \
242 * exception entry sequence, it was probably meant to apply to \
243 * the code where the exception occurred (since exception entry \
244 * doesn't turn off DE automatically). We simulate the effect \
245 * of turning off DE on entry to an exception handler by turning \
246 * off DE in the DSRR1 value and clearing the debug status. \
247 */ \
248 mfspr r10,SPRN_DBSR; /* check single-step/branch taken */ \
249 andis. r10,r10,(DBSR_IC|DBSR_BT)@h; \
250 beq+ 2f; \
251 \
252 lis r10,KERNELBASE@h; /* check if exception in vectors */ \
253 ori r10,r10,KERNELBASE@l; \
254 cmplw r12,r10; \
255 blt+ 2f; /* addr below exception vectors */ \
256 \
257 lis r10,DebugDebug@h; \
258 ori r10,r10,DebugDebug@l; \
259 cmplw r12,r10; \
260 bgt+ 2f; /* addr above exception vectors */ \
261 \
262 /* here it looks like we got an inappropriate debug exception. */ \
263 1: rlwinm r9,r9,0,~MSR_DE; /* clear DE in the CDRR1 value */ \
264 lis r10,(DBSR_IC|DBSR_BT)@h; /* clear the IC event */ \
265 mtspr SPRN_DBSR,r10; \
266 /* restore state and get out */ \
267 lwz r10,_CCR(r11); \
268 lwz r0,GPR0(r11); \
269 lwz r1,GPR1(r11); \
270 mtcrf 0x80,r10; \
271 mtspr SPRN_DSRR0,r12; \
272 mtspr SPRN_DSRR1,r9; \
273 lwz r9,GPR9(r11); \
274 lwz r12,GPR12(r11); \
275 mtspr SPRN_SPRG_WSCRATCH_DBG,r8; \
276 BOOKE_LOAD_EXC_LEVEL_STACK(DBG); /* r8 points to the debug stack */ \
277 lwz r10,GPR10(r8); \
278 lwz r11,GPR11(r8); \
279 mfspr r8,SPRN_SPRG_RSCRATCH_DBG; \
280 \
281 PPC_RFDI; \
282 b .; \
283 \
284 /* continue normal handling for a debug exception... */ \
285 2: mfspr r4,SPRN_DBSR; \
286 addi r3,r1,STACK_FRAME_OVERHEAD; \
287 EXC_XFER_TEMPLATE(DebugException, 0x2008, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), NOCOPY, debug_transfer_to_handler, ret_from_debug_exc)
288
289 #define DEBUG_CRIT_EXCEPTION \
290 START_EXCEPTION(DebugCrit); \
291 CRITICAL_EXCEPTION_PROLOG; \
292 \
293 /* \
294 * If there is a single step or branch-taken exception in an \
295 * exception entry sequence, it was probably meant to apply to \
296 * the code where the exception occurred (since exception entry \
297 * doesn't turn off DE automatically). We simulate the effect \
298 * of turning off DE on entry to an exception handler by turning \
299 * off DE in the CSRR1 value and clearing the debug status. \
300 */ \
301 mfspr r10,SPRN_DBSR; /* check single-step/branch taken */ \
302 andis. r10,r10,(DBSR_IC|DBSR_BT)@h; \
303 beq+ 2f; \
304 \
305 lis r10,KERNELBASE@h; /* check if exception in vectors */ \
306 ori r10,r10,KERNELBASE@l; \
307 cmplw r12,r10; \
308 blt+ 2f; /* addr below exception vectors */ \
309 \
310 lis r10,DebugCrit@h; \
311 ori r10,r10,DebugCrit@l; \
312 cmplw r12,r10; \
313 bgt+ 2f; /* addr above exception vectors */ \
314 \
315 /* here it looks like we got an inappropriate debug exception. */ \
316 1: rlwinm r9,r9,0,~MSR_DE; /* clear DE in the CSRR1 value */ \
317 lis r10,(DBSR_IC|DBSR_BT)@h; /* clear the IC event */ \
318 mtspr SPRN_DBSR,r10; \
319 /* restore state and get out */ \
320 lwz r10,_CCR(r11); \
321 lwz r0,GPR0(r11); \
322 lwz r1,GPR1(r11); \
323 mtcrf 0x80,r10; \
324 mtspr SPRN_CSRR0,r12; \
325 mtspr SPRN_CSRR1,r9; \
326 lwz r9,GPR9(r11); \
327 lwz r12,GPR12(r11); \
328 mtspr SPRN_SPRG_WSCRATCH_CRIT,r8; \
329 BOOKE_LOAD_EXC_LEVEL_STACK(CRIT); /* r8 points to the debug stack */ \
330 lwz r10,GPR10(r8); \
331 lwz r11,GPR11(r8); \
332 mfspr r8,SPRN_SPRG_RSCRATCH_CRIT; \
333 \
334 rfci; \
335 b .; \
336 \
337 /* continue normal handling for a critical exception... */ \
338 2: mfspr r4,SPRN_DBSR; \
339 addi r3,r1,STACK_FRAME_OVERHEAD; \
340 EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), NOCOPY, crit_transfer_to_handler, ret_from_crit_exc)
341
342 #define DATA_STORAGE_EXCEPTION \
343 START_EXCEPTION(DataStorage) \
344 NORMAL_EXCEPTION_PROLOG; \
345 mfspr r5,SPRN_ESR; /* Grab the ESR and save it */ \
346 stw r5,_ESR(r11); \
347 mfspr r4,SPRN_DEAR; /* Grab the DEAR */ \
348 EXC_XFER_EE_LITE(0x0300, handle_page_fault)
349
350 #define INSTRUCTION_STORAGE_EXCEPTION \
351 START_EXCEPTION(InstructionStorage) \
352 NORMAL_EXCEPTION_PROLOG; \
353 mfspr r5,SPRN_ESR; /* Grab the ESR and save it */ \
354 stw r5,_ESR(r11); \
355 mr r4,r12; /* Pass SRR0 as arg2 */ \
356 li r5,0; /* Pass zero as arg3 */ \
357 EXC_XFER_EE_LITE(0x0400, handle_page_fault)
358
359 #define ALIGNMENT_EXCEPTION \
360 START_EXCEPTION(Alignment) \
361 NORMAL_EXCEPTION_PROLOG; \
362 mfspr r4,SPRN_DEAR; /* Grab the DEAR and save it */ \
363 stw r4,_DEAR(r11); \
364 addi r3,r1,STACK_FRAME_OVERHEAD; \
365 EXC_XFER_EE(0x0600, alignment_exception)
366
367 #define PROGRAM_EXCEPTION \
368 START_EXCEPTION(Program) \
369 NORMAL_EXCEPTION_PROLOG; \
370 mfspr r4,SPRN_ESR; /* Grab the ESR and save it */ \
371 stw r4,_ESR(r11); \
372 addi r3,r1,STACK_FRAME_OVERHEAD; \
373 EXC_XFER_STD(0x0700, program_check_exception)
374
375 #define DECREMENTER_EXCEPTION \
376 START_EXCEPTION(Decrementer) \
377 NORMAL_EXCEPTION_PROLOG; \
378 lis r0,TSR_DIS@h; /* Setup the DEC interrupt mask */ \
379 mtspr SPRN_TSR,r0; /* Clear the DEC interrupt */ \
380 addi r3,r1,STACK_FRAME_OVERHEAD; \
381 EXC_XFER_LITE(0x0900, timer_interrupt)
382
383 #define FP_UNAVAILABLE_EXCEPTION \
384 START_EXCEPTION(FloatingPointUnavailable) \
385 NORMAL_EXCEPTION_PROLOG; \
386 beq 1f; \
387 bl load_up_fpu; /* if from user, just load it up */ \
388 b fast_exception_return; \
389 1: addi r3,r1,STACK_FRAME_OVERHEAD; \
390 EXC_XFER_EE_LITE(0x800, kernel_fp_unavailable_exception)
391
392 #ifndef __ASSEMBLY__
393 struct exception_regs {
394 unsigned long mas0;
395 unsigned long mas1;
396 unsigned long mas2;
397 unsigned long mas3;
398 unsigned long mas6;
399 unsigned long mas7;
400 unsigned long srr0;
401 unsigned long srr1;
402 unsigned long csrr0;
403 unsigned long csrr1;
404 unsigned long dsrr0;
405 unsigned long dsrr1;
406 unsigned long saved_ksp_limit;
407 };
408
409 /* ensure this structure is always sized to a multiple of the stack alignment */
410 #define STACK_EXC_LVL_FRAME_SIZE _ALIGN_UP(sizeof (struct exception_regs), 16)
411
412 #endif /* __ASSEMBLY__ */
413 #endif /* __HEAD_BOOKE_H__ */
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