diff options
author | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-19 08:47:57 -0400 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-19 08:47:57 -0400 |
commit | 40d743b8c16a8cf6e30c1d941aa6147f9550ea75 (patch) | |
tree | 9fcdf9a06b18a275253048d1ea7c9803cec38845 /arch/powerpc/include/asm/exception-64s.h | |
parent | 7da18afa423f167e7ef3c9728e584d8bf05bd55a (diff) | |
parent | 83e686ea0291ee93b87dcdc00b96443b80de56c9 (diff) |
Merge branch 'for-rmk' of git://linux-arm.org/linux-2.6
Diffstat (limited to 'arch/powerpc/include/asm/exception-64s.h')
-rw-r--r-- | arch/powerpc/include/asm/exception-64s.h | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h new file mode 100644 index 000000000000..a98653b26231 --- /dev/null +++ b/arch/powerpc/include/asm/exception-64s.h | |||
@@ -0,0 +1,282 @@ | |||
1 | #ifndef _ASM_POWERPC_EXCEPTION_H | ||
2 | #define _ASM_POWERPC_EXCEPTION_H | ||
3 | /* | ||
4 | * Extracted from head_64.S | ||
5 | * | ||
6 | * PowerPC version | ||
7 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | ||
8 | * | ||
9 | * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP | ||
10 | * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> | ||
11 | * Adapted for Power Macintosh by Paul Mackerras. | ||
12 | * Low-level exception handlers and MMU support | ||
13 | * rewritten by Paul Mackerras. | ||
14 | * Copyright (C) 1996 Paul Mackerras. | ||
15 | * | ||
16 | * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and | ||
17 | * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com | ||
18 | * | ||
19 | * This file contains the low-level support and setup for the | ||
20 | * PowerPC-64 platform, including trap and interrupt dispatch. | ||
21 | * | ||
22 | * This program is free software; you can redistribute it and/or | ||
23 | * modify it under the terms of the GNU General Public License | ||
24 | * as published by the Free Software Foundation; either version | ||
25 | * 2 of the License, or (at your option) any later version. | ||
26 | */ | ||
27 | /* | ||
28 | * The following macros define the code that appears as | ||
29 | * the prologue to each of the exception handlers. They | ||
30 | * are split into two parts to allow a single kernel binary | ||
31 | * to be used for pSeries and iSeries. | ||
32 | * | ||
33 | * We make as much of the exception code common between native | ||
34 | * exception handlers (including pSeries LPAR) and iSeries LPAR | ||
35 | * implementations as possible. | ||
36 | */ | ||
37 | |||
38 | #define EX_R9 0 | ||
39 | #define EX_R10 8 | ||
40 | #define EX_R11 16 | ||
41 | #define EX_R12 24 | ||
42 | #define EX_R13 32 | ||
43 | #define EX_SRR0 40 | ||
44 | #define EX_DAR 48 | ||
45 | #define EX_DSISR 56 | ||
46 | #define EX_CCR 60 | ||
47 | #define EX_R3 64 | ||
48 | #define EX_LR 72 | ||
49 | |||
50 | /* | ||
51 | * We're short on space and time in the exception prolog, so we can't | ||
52 | * use the normal SET_REG_IMMEDIATE macro. Normally we just need the | ||
53 | * low halfword of the address, but for Kdump we need the whole low | ||
54 | * word. | ||
55 | */ | ||
56 | #define LOAD_HANDLER(reg, label) \ | ||
57 | addi reg,reg,(label)-_stext; /* virt addr of handler ... */ | ||
58 | |||
59 | #define EXCEPTION_PROLOG_1(area) \ | ||
60 | mfspr r13,SPRN_SPRG_PACA; /* get paca address into r13 */ \ | ||
61 | std r9,area+EX_R9(r13); /* save r9 - r12 */ \ | ||
62 | std r10,area+EX_R10(r13); \ | ||
63 | std r11,area+EX_R11(r13); \ | ||
64 | std r12,area+EX_R12(r13); \ | ||
65 | mfspr r9,SPRN_SPRG_SCRATCH0; \ | ||
66 | std r9,area+EX_R13(r13); \ | ||
67 | mfcr r9 | ||
68 | |||
69 | #define EXCEPTION_PROLOG_PSERIES_1(label) \ | ||
70 | ld r12,PACAKBASE(r13); /* get high part of &label */ \ | ||
71 | ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \ | ||
72 | mfspr r11,SPRN_SRR0; /* save SRR0 */ \ | ||
73 | LOAD_HANDLER(r12,label) \ | ||
74 | mtspr SPRN_SRR0,r12; \ | ||
75 | mfspr r12,SPRN_SRR1; /* and SRR1 */ \ | ||
76 | mtspr SPRN_SRR1,r10; \ | ||
77 | rfid; \ | ||
78 | b . /* prevent speculative execution */ | ||
79 | |||
80 | #define EXCEPTION_PROLOG_PSERIES(area, label) \ | ||
81 | EXCEPTION_PROLOG_1(area); \ | ||
82 | EXCEPTION_PROLOG_PSERIES_1(label); | ||
83 | |||
84 | /* | ||
85 | * The common exception prolog is used for all except a few exceptions | ||
86 | * such as a segment miss on a kernel address. We have to be prepared | ||
87 | * to take another exception from the point where we first touch the | ||
88 | * kernel stack onwards. | ||
89 | * | ||
90 | * On entry r13 points to the paca, r9-r13 are saved in the paca, | ||
91 | * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and | ||
92 | * SRR1, and relocation is on. | ||
93 | */ | ||
94 | #define EXCEPTION_PROLOG_COMMON(n, area) \ | ||
95 | andi. r10,r12,MSR_PR; /* See if coming from user */ \ | ||
96 | mr r10,r1; /* Save r1 */ \ | ||
97 | subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \ | ||
98 | beq- 1f; \ | ||
99 | ld r1,PACAKSAVE(r13); /* kernel stack to use */ \ | ||
100 | 1: cmpdi cr1,r1,0; /* check if r1 is in userspace */ \ | ||
101 | bge- cr1,2f; /* abort if it is */ \ | ||
102 | b 3f; \ | ||
103 | 2: li r1,(n); /* will be reloaded later */ \ | ||
104 | sth r1,PACA_TRAP_SAVE(r13); \ | ||
105 | b bad_stack; \ | ||
106 | 3: std r9,_CCR(r1); /* save CR in stackframe */ \ | ||
107 | std r11,_NIP(r1); /* save SRR0 in stackframe */ \ | ||
108 | std r12,_MSR(r1); /* save SRR1 in stackframe */ \ | ||
109 | std r10,0(r1); /* make stack chain pointer */ \ | ||
110 | std r0,GPR0(r1); /* save r0 in stackframe */ \ | ||
111 | std r10,GPR1(r1); /* save r1 in stackframe */ \ | ||
112 | ACCOUNT_CPU_USER_ENTRY(r9, r10); \ | ||
113 | std r2,GPR2(r1); /* save r2 in stackframe */ \ | ||
114 | SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \ | ||
115 | SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \ | ||
116 | ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \ | ||
117 | ld r10,area+EX_R10(r13); \ | ||
118 | std r9,GPR9(r1); \ | ||
119 | std r10,GPR10(r1); \ | ||
120 | ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \ | ||
121 | ld r10,area+EX_R12(r13); \ | ||
122 | ld r11,area+EX_R13(r13); \ | ||
123 | std r9,GPR11(r1); \ | ||
124 | std r10,GPR12(r1); \ | ||
125 | std r11,GPR13(r1); \ | ||
126 | ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \ | ||
127 | mflr r9; /* save LR in stackframe */ \ | ||
128 | std r9,_LINK(r1); \ | ||
129 | mfctr r10; /* save CTR in stackframe */ \ | ||
130 | std r10,_CTR(r1); \ | ||
131 | lbz r10,PACASOFTIRQEN(r13); \ | ||
132 | mfspr r11,SPRN_XER; /* save XER in stackframe */ \ | ||
133 | std r10,SOFTE(r1); \ | ||
134 | std r11,_XER(r1); \ | ||
135 | li r9,(n)+1; \ | ||
136 | std r9,_TRAP(r1); /* set trap number */ \ | ||
137 | li r10,0; \ | ||
138 | ld r11,exception_marker@toc(r2); \ | ||
139 | std r10,RESULT(r1); /* clear regs->result */ \ | ||
140 | std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ | ||
141 | |||
142 | /* | ||
143 | * Exception vectors. | ||
144 | */ | ||
145 | #define STD_EXCEPTION_PSERIES(n, label) \ | ||
146 | . = n; \ | ||
147 | .globl label##_pSeries; \ | ||
148 | label##_pSeries: \ | ||
149 | HMT_MEDIUM; \ | ||
150 | mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \ | ||
151 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common) | ||
152 | |||
153 | #define HSTD_EXCEPTION_PSERIES(n, label) \ | ||
154 | . = n; \ | ||
155 | .globl label##_pSeries; \ | ||
156 | label##_pSeries: \ | ||
157 | HMT_MEDIUM; \ | ||
158 | mtspr SPRN_SPRG_SCRATCH0,r20; /* save r20 */ \ | ||
159 | mfspr r20,SPRN_HSRR0; /* copy HSRR0 to SRR0 */ \ | ||
160 | mtspr SPRN_SRR0,r20; \ | ||
161 | mfspr r20,SPRN_HSRR1; /* copy HSRR0 to SRR0 */ \ | ||
162 | mtspr SPRN_SRR1,r20; \ | ||
163 | mfspr r20,SPRN_SPRG_SCRATCH0; /* restore r20 */ \ | ||
164 | mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \ | ||
165 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common) | ||
166 | |||
167 | |||
168 | #define MASKABLE_EXCEPTION_PSERIES(n, label) \ | ||
169 | . = n; \ | ||
170 | .globl label##_pSeries; \ | ||
171 | label##_pSeries: \ | ||
172 | HMT_MEDIUM; \ | ||
173 | mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \ | ||
174 | mfspr r13,SPRN_SPRG_PACA; /* get paca address into r13 */ \ | ||
175 | std r9,PACA_EXGEN+EX_R9(r13); /* save r9, r10 */ \ | ||
176 | std r10,PACA_EXGEN+EX_R10(r13); \ | ||
177 | lbz r10,PACASOFTIRQEN(r13); \ | ||
178 | mfcr r9; \ | ||
179 | cmpwi r10,0; \ | ||
180 | beq masked_interrupt; \ | ||
181 | mfspr r10,SPRN_SPRG_SCRATCH0; \ | ||
182 | std r10,PACA_EXGEN+EX_R13(r13); \ | ||
183 | std r11,PACA_EXGEN+EX_R11(r13); \ | ||
184 | std r12,PACA_EXGEN+EX_R12(r13); \ | ||
185 | ld r12,PACAKBASE(r13); /* get high part of &label */ \ | ||
186 | ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \ | ||
187 | mfspr r11,SPRN_SRR0; /* save SRR0 */ \ | ||
188 | LOAD_HANDLER(r12,label##_common) \ | ||
189 | mtspr SPRN_SRR0,r12; \ | ||
190 | mfspr r12,SPRN_SRR1; /* and SRR1 */ \ | ||
191 | mtspr SPRN_SRR1,r10; \ | ||
192 | rfid; \ | ||
193 | b . /* prevent speculative execution */ | ||
194 | |||
195 | #ifdef CONFIG_PPC_ISERIES | ||
196 | #define DISABLE_INTS \ | ||
197 | li r11,0; \ | ||
198 | stb r11,PACASOFTIRQEN(r13); \ | ||
199 | BEGIN_FW_FTR_SECTION; \ | ||
200 | stb r11,PACAHARDIRQEN(r13); \ | ||
201 | END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES); \ | ||
202 | TRACE_DISABLE_INTS; \ | ||
203 | BEGIN_FW_FTR_SECTION; \ | ||
204 | mfmsr r10; \ | ||
205 | ori r10,r10,MSR_EE; \ | ||
206 | mtmsrd r10,1; \ | ||
207 | END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) | ||
208 | #else | ||
209 | #define DISABLE_INTS \ | ||
210 | li r11,0; \ | ||
211 | stb r11,PACASOFTIRQEN(r13); \ | ||
212 | stb r11,PACAHARDIRQEN(r13); \ | ||
213 | TRACE_DISABLE_INTS | ||
214 | #endif /* CONFIG_PPC_ISERIES */ | ||
215 | |||
216 | #define ENABLE_INTS \ | ||
217 | ld r12,_MSR(r1); \ | ||
218 | mfmsr r11; \ | ||
219 | rlwimi r11,r12,0,MSR_EE; \ | ||
220 | mtmsrd r11,1 | ||
221 | |||
222 | #define STD_EXCEPTION_COMMON(trap, label, hdlr) \ | ||
223 | .align 7; \ | ||
224 | .globl label##_common; \ | ||
225 | label##_common: \ | ||
226 | EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ | ||
227 | DISABLE_INTS; \ | ||
228 | bl .save_nvgprs; \ | ||
229 | addi r3,r1,STACK_FRAME_OVERHEAD; \ | ||
230 | bl hdlr; \ | ||
231 | b .ret_from_except | ||
232 | |||
233 | /* | ||
234 | * Like STD_EXCEPTION_COMMON, but for exceptions that can occur | ||
235 | * in the idle task and therefore need the special idle handling. | ||
236 | */ | ||
237 | #define STD_EXCEPTION_COMMON_IDLE(trap, label, hdlr) \ | ||
238 | .align 7; \ | ||
239 | .globl label##_common; \ | ||
240 | label##_common: \ | ||
241 | EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ | ||
242 | FINISH_NAP; \ | ||
243 | DISABLE_INTS; \ | ||
244 | bl .save_nvgprs; \ | ||
245 | addi r3,r1,STACK_FRAME_OVERHEAD; \ | ||
246 | bl hdlr; \ | ||
247 | b .ret_from_except | ||
248 | |||
249 | #define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr) \ | ||
250 | .align 7; \ | ||
251 | .globl label##_common; \ | ||
252 | label##_common: \ | ||
253 | EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ | ||
254 | FINISH_NAP; \ | ||
255 | DISABLE_INTS; \ | ||
256 | BEGIN_FTR_SECTION \ | ||
257 | bl .ppc64_runlatch_on; \ | ||
258 | END_FTR_SECTION_IFSET(CPU_FTR_CTRL) \ | ||
259 | addi r3,r1,STACK_FRAME_OVERHEAD; \ | ||
260 | bl hdlr; \ | ||
261 | b .ret_from_except_lite | ||
262 | |||
263 | /* | ||
264 | * When the idle code in power4_idle puts the CPU into NAP mode, | ||
265 | * it has to do so in a loop, and relies on the external interrupt | ||
266 | * and decrementer interrupt entry code to get it out of the loop. | ||
267 | * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags | ||
268 | * to signal that it is in the loop and needs help to get out. | ||
269 | */ | ||
270 | #ifdef CONFIG_PPC_970_NAP | ||
271 | #define FINISH_NAP \ | ||
272 | BEGIN_FTR_SECTION \ | ||
273 | clrrdi r11,r1,THREAD_SHIFT; \ | ||
274 | ld r9,TI_LOCAL_FLAGS(r11); \ | ||
275 | andi. r10,r9,_TLF_NAPPING; \ | ||
276 | bnel power4_fixup_nap; \ | ||
277 | END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) | ||
278 | #else | ||
279 | #define FINISH_NAP | ||
280 | #endif | ||
281 | |||
282 | #endif /* _ASM_POWERPC_EXCEPTION_H */ | ||