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1/*
2 * HPMC (High Priority Machine Check) handler.
3 *
4 * Copyright (C) 1999 Philipp Rumpf <prumpf@tux.org>
5 * Copyright (C) 1999 Hewlett-Packard (Frank Rowand)
6 * Copyright (C) 2000 Hewlett-Packard (John Marvin)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
11 * any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23
24/*
25 * This HPMC handler retrieves the HPMC pim data, resets IO and
26 * returns to the default trap handler with code set to 1 (HPMC).
27 * The default trap handler calls handle interruption, which
28 * does a stack and register dump. This at least allows kernel
29 * developers to get back to C code in virtual mode, where they
30 * have the option to examine and print values from memory that
31 * would help in debugging an HPMC caused by a software bug.
32 *
33 * There is more to do here:
34 *
35 * 1) On MP systems we need to synchronize processors
36 * before calling pdc/iodc.
37 * 2) We should be checking the system state and not
38 * returning to the fault handler if things are really
39 * bad.
40 *
41 */
42
43 .level 1.1
44 .data
45
46#include <asm/assembly.h>
47#include <asm/pdc.h>
48
49#include <linux/linkage.h>
50
51 /*
52 * stack for os_hpmc, the HPMC handler.
53 * buffer for IODC procedures (for the HPMC handler).
54 *
55 * IODC requires 7K byte stack. That leaves 1K byte for os_hpmc.
56 */
57
58 .align PAGE_SIZE
59hpmc_stack:
60 .block 16384
61
62#define HPMC_IODC_BUF_SIZE 0x8000
63
64 .align PAGE_SIZE
65hpmc_iodc_buf:
66 .block HPMC_IODC_BUF_SIZE
67
68 .align 8
69hpmc_raddr:
70 .block 128
71
72#define HPMC_PIM_DATA_SIZE 896 /* Enough to hold all architected 2.0 state */
73
74 .align 8
75ENTRY(hpmc_pim_data)
76 .block HPMC_PIM_DATA_SIZE
77END(hpmc_pim_data)
78
79 .text
80
81 .import intr_save, code
82ENTRY(os_hpmc)
83.os_hpmc:
84
85 /*
86 * registers modified:
87 *
88 * Using callee saves registers without saving them. The
89 * original values are in the pim dump if we need them.
90 *
91 * r2 (rp) return pointer
92 * r3 address of PDCE_PROC
93 * r4 scratch
94 * r5 scratch
95 * r23 (arg3) procedure arg
96 * r24 (arg2) procedure arg
97 * r25 (arg1) procedure arg
98 * r26 (arg0) procedure arg
99 * r30 (sp) stack pointer
100 *
101 * registers read:
102 *
103 * r26 contains address of PDCE_PROC on entry
104 * r28 (ret0) return value from procedure
105 */
106
107 copy arg0, %r3 /* save address of PDCE_PROC */
108
109 /*
110 * disable nested HPMCs
111 *
112 * Increment os_hpmc checksum to invalidate it.
113 * Do this before turning the PSW M bit off.
114 */
115
116 mfctl %cr14, %r4
117 ldw 52(%r4),%r5
118 addi 1,%r5,%r5
119 stw %r5,52(%r4)
120
121 /* MP_FIXME: synchronize all processors. */
122
123 /* Setup stack pointer. */
124
125 load32 PA(hpmc_stack),sp
126
127 ldo 128(sp),sp /* leave room for arguments */
128
129 /*
130 * Most PDC routines require that the M bit be off.
131 * So turn on the Q bit and turn off the M bit.
132 */
133
134 ldo 8(%r0),%r4 /* PSW Q on, PSW M off */
135 mtctl %r4,ipsw
136 mtctl %r0,pcsq
137 mtctl %r0,pcsq
138 load32 PA(os_hpmc_1),%r4
139 mtctl %r4,pcoq
140 ldo 4(%r4),%r4
141 mtctl %r4,pcoq
142 rfi
143 nop
144
145os_hpmc_1:
146
147 /* Call PDC_PIM to get HPMC pim info */
148
149 /*
150 * Note that on some newer boxes, PDC_PIM must be called
151 * before PDC_IO if you want IO to be reset. PDC_PIM sets
152 * a flag that PDC_IO examines.
153 */
154
155 ldo PDC_PIM(%r0), arg0
156 ldo PDC_PIM_HPMC(%r0),arg1 /* Transfer HPMC data */
157 load32 PA(hpmc_raddr),arg2
158 load32 PA(hpmc_pim_data),arg3
159 load32 HPMC_PIM_DATA_SIZE,%r4
160 stw %r4,-52(sp)
161
162 ldil L%PA(os_hpmc_2), rp
163 bv (r3) /* call pdce_proc */
164 ldo R%PA(os_hpmc_2)(rp), rp
165
166os_hpmc_2:
167 comib,<> 0,ret0, os_hpmc_fail
168
169 /* Reset IO by calling the hversion dependent PDC_IO routine */
170
171 ldo PDC_IO(%r0),arg0
172 ldo 0(%r0),arg1 /* log IO errors */
173 ldo 0(%r0),arg2 /* reserved */
174 ldo 0(%r0),arg3 /* reserved */
175 stw %r0,-52(sp) /* reserved */
176
177 ldil L%PA(os_hpmc_3),rp
178 bv (%r3) /* call pdce_proc */
179 ldo R%PA(os_hpmc_3)(rp),rp
180
181os_hpmc_3:
182
183 /* FIXME? Check for errors from PDC_IO (-1 might be OK) */
184
185 /*
186 * Initialize the IODC console device (HPA,SPA, path etc.
187 * are stored on page 0.
188 */
189
190 /*
191 * Load IODC into hpmc_iodc_buf by calling PDC_IODC.
192 * Note that PDC_IODC handles flushing the appropriate
193 * data and instruction cache lines.
194 */
195
196 ldo PDC_IODC(%r0),arg0
197 ldo PDC_IODC_READ(%r0),arg1
198 load32 PA(hpmc_raddr),arg2
199 ldw BOOT_CONSOLE_HPA_OFFSET(%r0),arg3 /* console hpa */
200 ldo PDC_IODC_RI_INIT(%r0),%r4
201 stw %r4,-52(sp)
202 load32 PA(hpmc_iodc_buf),%r4
203 stw %r4,-56(sp)
204 load32 HPMC_IODC_BUF_SIZE,%r4
205 stw %r4,-60(sp)
206
207 ldil L%PA(os_hpmc_4),rp
208 bv (%r3) /* call pdce_proc */
209 ldo R%PA(os_hpmc_4)(rp),rp
210
211os_hpmc_4:
212 comib,<> 0,ret0,os_hpmc_fail
213
214 /* Call the entry init (just loaded by PDC_IODC) */
215
216 ldw BOOT_CONSOLE_HPA_OFFSET(%r0),arg0 /* console hpa */
217 ldo ENTRY_INIT_MOD_DEV(%r0), arg1
218 ldw BOOT_CONSOLE_SPA_OFFSET(%r0),arg2 /* console spa */
219 depi 0,31,11,arg2 /* clear bits 21-31 */
220 ldo BOOT_CONSOLE_PATH_OFFSET(%r0),arg3 /* console path */
221 load32 PA(hpmc_raddr),%r4
222 stw %r4, -52(sp)
223 stw %r0, -56(sp) /* HV */
224 stw %r0, -60(sp) /* HV */
225 stw %r0, -64(sp) /* HV */
226 stw %r0, -68(sp) /* lang, must be zero */
227
228 load32 PA(hpmc_iodc_buf),%r5
229 ldil L%PA(os_hpmc_5),rp
230 bv (%r5)
231 ldo R%PA(os_hpmc_5)(rp),rp
232
233os_hpmc_5:
234 comib,<> 0,ret0,os_hpmc_fail
235
236 /* Prepare to call intr_save */
237
238 /*
239 * Load kernel page directory (load into user also, since
240 * we don't intend to ever return to user land anyway)
241 */
242
243 load32 PA(swapper_pg_dir),%r4
244 mtctl %r4,%cr24 /* Initialize kernel root pointer */
245 mtctl %r4,%cr25 /* Initialize user root pointer */
246
247 /* Clear sr4-sr7 */
248
249 mtsp %r0, %sr4
250 mtsp %r0, %sr5
251 mtsp %r0, %sr6
252 mtsp %r0, %sr7
253
254 tovirt_r1 %r30 /* make sp virtual */
255
256 rsm 8,%r0 /* Clear Q bit */
257 ldi 1,%r8 /* Set trap code to "1" for HPMC */
258 load32 PA(intr_save),%r1
259 be 0(%sr7,%r1)
260 nop
261
262os_hpmc_fail:
263
264 /*
265 * Reset the system
266 *
267 * Some systems may lockup from a broadcast reset, so try the
268 * hversion PDC_BROADCAST_RESET() first.
269 * MP_FIXME: reset all processors if more than one central bus.
270 */
271
272 /* PDC_BROADCAST_RESET() */
273
274 ldo PDC_BROADCAST_RESET(%r0),arg0
275 ldo 0(%r0),arg1 /* do reset */
276
277 ldil L%PA(os_hpmc_6),rp
278 bv (%r3) /* call pdce_proc */
279 ldo R%PA(os_hpmc_6)(rp),rp
280
281os_hpmc_6:
282
283 /*
284 * possible return values:
285 * -1 non-existent procedure
286 * -2 non-existent option
287 * -16 unaligned stack
288 *
289 * If call returned, do a broadcast reset.
290 */
291
292 ldil L%0xfffc0000,%r4 /* IO_BROADCAST */
293 ldo 5(%r0),%r5
294 stw %r5,48(%r4) /* CMD_RESET to IO_COMMAND offset */
295
296 b .
297 nop
298ENDPROC(os_hpmc)
299.os_hpmc_end:
300 nop
301.data
302.align 4
303 .export os_hpmc_size
304os_hpmc_size:
305 .word .os_hpmc_end-.os_hpmc
1/*
2 * HPMC (High Priority Machine Check) handler.
3 *
4 * Copyright (C) 1999 Philipp Rumpf <prumpf@tux.org>
5 * Copyright (C) 1999 Hewlett-Packard (Frank Rowand)
6 * Copyright (C) 2000 Hewlett-Packard (John Marvin)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
11 * any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23
24/*
25 * This HPMC handler retrieves the HPMC pim data, resets IO and
26 * returns to the default trap handler with code set to 1 (HPMC).
27 * The default trap handler calls handle interruption, which
28 * does a stack and register dump. This at least allows kernel
29 * developers to get back to C code in virtual mode, where they
30 * have the option to examine and print values from memory that
31 * would help in debugging an HPMC caused by a software bug.
32 *
33 * There is more to do here:
34 *
35 * 1) On MP systems we need to synchronize processors
36 * before calling pdc/iodc.
37 * 2) We should be checking the system state and not
38 * returning to the fault handler if things are really
39 * bad.
40 *
41 */
42
43 .level 1.1
44
45#include <asm/assembly.h>
46#include <asm/pdc.h>
47#include <asm/psw.h>
48
49#include <linux/linkage.h>
50#include <linux/init.h>
51
52 /*
53 * stack for os_hpmc, the HPMC handler.
54 * buffer for IODC procedures (for the HPMC handler).
55 *
56 * IODC requires 7K byte stack. That leaves 1K byte for os_hpmc.
57 */
58
59 __PAGE_ALIGNED_BSS
60 .align 4096
61hpmc_stack:
62 .block 16384
63
64#define HPMC_IODC_BUF_SIZE 0x8000
65
66 __PAGE_ALIGNED_BSS
67 .align 4096
68hpmc_iodc_buf:
69 .block HPMC_IODC_BUF_SIZE
70
71 .section .bss
72 .align 8
73hpmc_raddr:
74 .block 128
75
76#define HPMC_PIM_DATA_SIZE 896 /* Enough to hold all architected 2.0 state */
77
78 .section .bss
79 .align 8
80ENTRY(hpmc_pim_data)
81 .block HPMC_PIM_DATA_SIZE
82END(hpmc_pim_data)
83
84 .text
85
86 .import intr_save, code
87 .align 16
88ENTRY_CFI(os_hpmc)
89.os_hpmc:
90
91 /*
92 * registers modified:
93 *
94 * Using callee saves registers without saving them. The
95 * original values are in the pim dump if we need them.
96 *
97 * r2 (rp) return pointer
98 * r3 address of PDCE_PROC
99 * r4 scratch
100 * r5 scratch
101 * r23 (arg3) procedure arg
102 * r24 (arg2) procedure arg
103 * r25 (arg1) procedure arg
104 * r26 (arg0) procedure arg
105 * r30 (sp) stack pointer
106 *
107 * registers read:
108 *
109 * r26 contains address of PDCE_PROC on entry
110 * r28 (ret0) return value from procedure
111 */
112
113 copy arg0, %r3 /* save address of PDCE_PROC */
114
115 /*
116 * disable nested HPMCs
117 *
118 * Increment os_hpmc checksum to invalidate it.
119 * Do this before turning the PSW M bit off.
120 */
121
122 mfctl %cr14, %r4
123 ldw 52(%r4),%r5
124 addi 1,%r5,%r5
125 stw %r5,52(%r4)
126
127 /* MP_FIXME: synchronize all processors. */
128
129 /* Setup stack pointer. */
130
131 load32 PA(hpmc_stack),sp
132
133 ldo 128(sp),sp /* leave room for arguments */
134
135 /*
136 * Most PDC routines require that the M bit be off.
137 * So turn on the Q bit and turn off the M bit.
138 */
139
140 ldi PSW_SM_Q,%r4 /* PSW Q on, PSW M off */
141 mtctl %r4,ipsw
142 mtctl %r0,pcsq
143 mtctl %r0,pcsq
144 load32 PA(os_hpmc_1),%r4
145 mtctl %r4,pcoq
146 ldo 4(%r4),%r4
147 mtctl %r4,pcoq
148 rfi
149 nop
150
151os_hpmc_1:
152
153 /* Call PDC_PIM to get HPMC pim info */
154
155 /*
156 * Note that on some newer boxes, PDC_PIM must be called
157 * before PDC_IO if you want IO to be reset. PDC_PIM sets
158 * a flag that PDC_IO examines.
159 */
160
161 ldo PDC_PIM(%r0), arg0
162 ldo PDC_PIM_HPMC(%r0),arg1 /* Transfer HPMC data */
163 load32 PA(hpmc_raddr),arg2
164 load32 PA(hpmc_pim_data),arg3
165 load32 HPMC_PIM_DATA_SIZE,%r4
166 stw %r4,-52(sp)
167
168 ldil L%PA(os_hpmc_2), rp
169 bv (r3) /* call pdce_proc */
170 ldo R%PA(os_hpmc_2)(rp), rp
171
172os_hpmc_2:
173 comib,<> 0,ret0, os_hpmc_fail
174
175 /* Reset IO by calling the hversion dependent PDC_IO routine */
176
177 ldo PDC_IO(%r0),arg0
178 ldo 0(%r0),arg1 /* log IO errors */
179 ldo 0(%r0),arg2 /* reserved */
180 ldo 0(%r0),arg3 /* reserved */
181 stw %r0,-52(sp) /* reserved */
182
183 ldil L%PA(os_hpmc_3),rp
184 bv (%r3) /* call pdce_proc */
185 ldo R%PA(os_hpmc_3)(rp),rp
186
187os_hpmc_3:
188
189 /* FIXME? Check for errors from PDC_IO (-1 might be OK) */
190
191 /*
192 * Initialize the IODC console device (HPA,SPA, path etc.
193 * are stored on page 0.
194 */
195
196 /*
197 * Load IODC into hpmc_iodc_buf by calling PDC_IODC.
198 * Note that PDC_IODC handles flushing the appropriate
199 * data and instruction cache lines.
200 */
201
202 ldo PDC_IODC(%r0),arg0
203 ldo PDC_IODC_READ(%r0),arg1
204 load32 PA(hpmc_raddr),arg2
205 ldw BOOT_CONSOLE_HPA_OFFSET(%r0),arg3 /* console hpa */
206 ldo PDC_IODC_RI_INIT(%r0),%r4
207 stw %r4,-52(sp)
208 load32 PA(hpmc_iodc_buf),%r4
209 stw %r4,-56(sp)
210 load32 HPMC_IODC_BUF_SIZE,%r4
211 stw %r4,-60(sp)
212
213 ldil L%PA(os_hpmc_4),rp
214 bv (%r3) /* call pdce_proc */
215 ldo R%PA(os_hpmc_4)(rp),rp
216
217os_hpmc_4:
218 comib,<> 0,ret0,os_hpmc_fail
219
220 /* Call the entry init (just loaded by PDC_IODC) */
221
222 ldw BOOT_CONSOLE_HPA_OFFSET(%r0),arg0 /* console hpa */
223 ldo ENTRY_INIT_MOD_DEV(%r0), arg1
224 ldw BOOT_CONSOLE_SPA_OFFSET(%r0),arg2 /* console spa */
225 depi 0,31,11,arg2 /* clear bits 21-31 */
226 ldo BOOT_CONSOLE_PATH_OFFSET(%r0),arg3 /* console path */
227 load32 PA(hpmc_raddr),%r4
228 stw %r4, -52(sp)
229 stw %r0, -56(sp) /* HV */
230 stw %r0, -60(sp) /* HV */
231 stw %r0, -64(sp) /* HV */
232 stw %r0, -68(sp) /* lang, must be zero */
233
234 load32 PA(hpmc_iodc_buf),%r5
235 ldil L%PA(os_hpmc_5),rp
236 bv (%r5)
237 ldo R%PA(os_hpmc_5)(rp),rp
238
239os_hpmc_5:
240 comib,<> 0,ret0,os_hpmc_fail
241
242 /* Prepare to call intr_save */
243
244 /*
245 * Load kernel page directory (load into user also, since
246 * we don't intend to ever return to user land anyway)
247 */
248
249 load32 PA(swapper_pg_dir),%r4
250 mtctl %r4,%cr24 /* Initialize kernel root pointer */
251 mtctl %r4,%cr25 /* Initialize user root pointer */
252
253 /* Clear sr4-sr7 */
254
255 mtsp %r0, %sr4
256 mtsp %r0, %sr5
257 mtsp %r0, %sr6
258 mtsp %r0, %sr7
259
260 tovirt_r1 %r30 /* make sp virtual */
261
262 rsm PSW_SM_Q,%r0 /* Clear Q bit */
263 ldi 1,%r8 /* Set trap code to "1" for HPMC */
264 load32 PA(intr_save),%r1
265 be 0(%sr7,%r1)
266 nop
267
268os_hpmc_fail:
269
270 /*
271 * Reset the system
272 *
273 * Some systems may lockup from a broadcast reset, so try the
274 * hversion PDC_BROADCAST_RESET() first.
275 * MP_FIXME: reset all processors if more than one central bus.
276 */
277
278 /* PDC_BROADCAST_RESET() */
279
280 ldo PDC_BROADCAST_RESET(%r0),arg0
281 ldo 0(%r0),arg1 /* do reset */
282
283 ldil L%PA(os_hpmc_6),rp
284 bv (%r3) /* call pdce_proc */
285 ldo R%PA(os_hpmc_6)(rp),rp
286
287os_hpmc_6:
288
289 /*
290 * possible return values:
291 * -1 non-existent procedure
292 * -2 non-existent option
293 * -16 unaligned stack
294 *
295 * If call returned, do a broadcast reset.
296 */
297
298 ldil L%0xfffc0000,%r4 /* IO_BROADCAST */
299 ldo 5(%r0),%r5
300 stw %r5,48(%r4) /* CMD_RESET to IO_COMMAND offset */
301
302 b .
303 nop
304 .align 16 /* make function length multiple of 16 bytes */
305ENDPROC_CFI(os_hpmc)
306.os_hpmc_end:
307
308
309 __INITRODATA
310.globl os_hpmc_size
311 .align 4
312 .type os_hpmc_size, @object
313 .size os_hpmc_size, 4
314os_hpmc_size:
315 .word .os_hpmc_end-.os_hpmc