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gerrit.cesnet.cz / github / trini / u-boot / 3e0bc4473add883fd68a49b7dab971191b943415 / . / cpu / mpc85xx / start.S
blob: af28ebe33fcb52b7c87f5871d2a3a8fd68cc72d4 [file] [log] [blame]
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]1/*
wdenk97d80fc2004-06-09 00:34:46 +0000[diff] [blame]2 * Copyright 2004 Freescale Semiconductor.
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]3 * Copyright (C) 2003 Motorola,Inc.
4 * Xianghua Xiao<X.Xiao@motorola.com>
5 *
6 * See file CREDITS for list of people who contributed to this
7 * project.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (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 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 * MA 02111-1307 USA
23 */
24
25/* U-Boot Startup Code for Motorola 85xx PowerPC based Embedded Boards
26 *
27 * The processor starts at 0xfffffffc and the code is first executed in the
28 * last 4K page(0xfffff000-0xffffffff) in flash/rom.
29 *
30 */
31
32#include <config.h>
33#include <mpc85xx.h>
34#include <version.h>
35
36#define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
37
38#include <ppc_asm.tmpl>
39#include <ppc_defs.h>
40
41#include <asm/cache.h>
42#include <asm/mmu.h>
43
44#ifndef CONFIG_IDENT_STRING
45#define CONFIG_IDENT_STRING ""
46#endif
47
48#undef MSR_KERNEL
49#define MSR_KERNEL ( MSR_ME ) /* Machine Check */
50
51/*
52 * Set up GOT: Global Offset Table
53 *
54 * Use r14 to access the GOT
55 */
56 START_GOT
57 GOT_ENTRY(_GOT2_TABLE_)
58 GOT_ENTRY(_FIXUP_TABLE_)
59
60 GOT_ENTRY(_start)
61 GOT_ENTRY(_start_of_vectors)
62 GOT_ENTRY(_end_of_vectors)
63 GOT_ENTRY(transfer_to_handler)
64
65 GOT_ENTRY(__init_end)
66 GOT_ENTRY(_end)
67 GOT_ENTRY(__bss_start)
68 END_GOT
69
70/*
71 * e500 Startup -- after reset only the last 4KB of the effective
72 * address space is mapped in the MMU L2 TLB1 Entry0. The .bootpg
73 * section is located at THIS LAST page and basically does three
74 * things: clear some registers, set up exception tables and
75 * add more TLB entries for 'larger spaces'(e.g. the boot rom) to
76 * continue the boot procedure.
77
78 * Once the boot rom is mapped by TLB entries we can proceed
79 * with normal startup.
80 *
81 */
82
83 .section .bootpg,"ax"
84 .globl _start_e500
85
86_start_e500:
wdenk97d80fc2004-06-09 00:34:46 +0000[diff] [blame]87 mfspr r0, PVR
88 lis r1, PVR_85xx_REV1@h
89 ori r1, r1, PVR_85xx_REV1@l
90 cmpw r0, r1
91 bne 1f
92
93 /* Semi-bogus errata fixup for Rev 1 */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]94 li r0,0x2000
95 mtspr 977,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]96
wdenk97d80fc2004-06-09 00:34:46 +0000[diff] [blame]97 /*
98 * Before invalidating MMU L1/L2, read TLB1 Entry 0 and then
99 * write it back immediately to fixup a Rev 1 bug (Errata CPU4)
100 * for this initial TLB1 entry 0, otherwise the TLB1 entry 0
101 * will be invalidated (incorrectly).
102 */
103 lis r2,0x1000
104 mtspr MAS0,r2
105 tlbre
106 tlbwe
107 isync
108
1091:
110 /*
111 * Clear and set up some registers.
112 * Note: Some registers need strict synchronization by
113 * sync/mbar/msync/isync when being "mtspr".
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]114 * BookE: isync before PID,tlbivax,tlbwe
115 * BookE: isync after MSR,PID; msync_isync after tlbivax & tlbwe
116 * E500: msync,isync before L1CSR0
wdenk97d80fc2004-06-09 00:34:46 +0000[diff] [blame]117 * E500: isync after BBEAR,BBTAR,BUCSR,DBCR0,DBCR1,HID0,HID1,
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]118 * L1CSR0, L1CSR1, MAS[0,1,2,3,4,6],MMUCSR0, PID[0,1,2],
119 * SPEFCSR
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]120 */
121
122 /* invalidate d-cache */
123 mfspr r0,L1CSR0
124 ori r0,r0,0x0002
125 msync
126 isync
127 mtspr L1CSR0,r0
128 isync
129
130 /* disable d-cache */
131 li r0,0x0
132 mtspr L1CSR0,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]133
134 /* invalidate i-cache */
135 mfspr r0,L1CSR1
136 ori r0,r0,0x0002
137 mtspr L1CSR1,r0
138 isync
139
140 /* disable i-cache */
141 li r0,0x0
142 mtspr L1CSR1,r0
143 isync
144
145 /* clear registers */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]146 li r0,0
147 mtspr SRR0,r0
148 mtspr SRR1,r0
149 mtspr CSRR0,r0
150 mtspr CSRR1,r0
151 mtspr MCSRR0,r0
152 mtspr MCSRR1,r0
153
154 mtspr ESR,r0
155 mtspr MCSR,r0
156 mtspr DEAR,r0
157
158 mtspr DBCR0,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]159 mtspr DBCR1,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]160 mtspr DBCR2,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]161 mtspr IAC1,r0
162 mtspr IAC2,r0
163 mtspr DAC1,r0
164 mtspr DAC2,r0
165
166 mfspr r1,DBSR
167 mtspr DBSR,r1 /* Clear all valid bits */
168
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]169 mtspr PID0,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]170 mtspr PID1,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]171 mtspr PID2,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]172 mtspr TCR,r0
173
174 mtspr BUCSR,r0 /* disable branch prediction */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]175 mtspr MAS4,r0
176 mtspr MAS6,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]177 isync
178
179 /* Setup interrupt vectors */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]180 lis r1,TEXT_BASE@h
wdenk97d80fc2004-06-09 00:34:46 +0000[diff] [blame]181 mtspr IVPR, r1
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]182
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]183 li r1,0x0100
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]184 mtspr IVOR0,r1 /* 0: Critical input */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]185 li r1,0x0200
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]186 mtspr IVOR1,r1 /* 1: Machine check */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]187 li r1,0x0300
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]188 mtspr IVOR2,r1 /* 2: Data storage */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]189 li r1,0x0400
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]190 mtspr IVOR3,r1 /* 3: Instruction storage */
191 li r1,0x0500
192 mtspr IVOR4,r1 /* 4: External interrupt */
193 li r1,0x0600
194 mtspr IVOR5,r1 /* 5: Alignment */
195 li r1,0x0700
196 mtspr IVOR6,r1 /* 6: Program check */
197 li r1,0x0800
198 mtspr IVOR7,r1 /* 7: floating point unavailable */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]199 li r1,0x0900
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]200 mtspr IVOR8,r1 /* 8: System call */
201 /* 9: Auxiliary processor unavailable(unsupported) */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]202 li r1,0x0a00
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]203 mtspr IVOR10,r1 /* 10: Decrementer */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]204 li r1,0x0b00
205 mtspr IVOR11,r1 /* 11: Interval timer */
206 li r1,0x0c00
Wolfgang Denk3e0bc442005-08-04 01:24:19 +0200[diff] [blame^]207 mtspr IVOR12,r1 /* 12: Watchdog timer */
208 li r1,0x0d00
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]209 mtspr IVOR13,r1 /* 13: Data TLB error */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]210 li r1,0x0e00
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]211 mtspr IVOR14,r1 /* 14: Instruction TLB error */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]212 li r1,0x0f00
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]213 mtspr IVOR15,r1 /* 15: Debug */
214
wdenk97d80fc2004-06-09 00:34:46 +0000[diff] [blame]215 /*
216 * Invalidate MMU L1/L2
217 *
218 * Note: There is a fixup earlier for Errata CPU4 on
219 * Rev 1 parts that must precede this MMU invalidation.
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]220 */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]221 li r2, 0x001e
222 mtspr MMUCSR0, r2
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]223 isync
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]224
wdenk9aea9532004-08-01 23:02:45 +0000[diff] [blame]225 /*
226 * Invalidate all TLB0 entries.
227 */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]228 li r3,4
wdenk9aea9532004-08-01 23:02:45 +0000[diff] [blame]229 li r4,0
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]230 tlbivax r4,r3
wdenk9aea9532004-08-01 23:02:45 +0000[diff] [blame]231 /*
232 * To avoid REV1 Errata CPU6 issues, make sure
233 * the instruction following tlbivax is not a store.
234 */
235
236 /*
237 * After reset, CCSRBAR is located at CFG_CCSRBAR_DEFAULT, i.e.
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]238 * 0xff700000-0xff800000. We need add a TLB1 entry for this 1MB
239 * region before we can access any CCSR registers such as L2
240 * registers, Local Access Registers,etc. We will also re-allocate
241 * CFG_CCSRBAR_DEFAULT to CFG_CCSRBAR immediately after TLB1 setup.
242 *
243 * Please refer to board-specif directory for TLB1 entry configuration.
244 * (e.g. board/<yourboard>/init.S)
245 *
246 */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]247 bl tlb1_entry
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]248 mr r5,r0
wdenk9aea9532004-08-01 23:02:45 +0000[diff] [blame]249 li r1,0x0020 /* max 16 TLB1 plus some TLB0 entries */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]250 mtctr r1
251 lwzu r4,0(r5) /* how many TLB1 entries we actually use */
252
2530: cmpwi r4,0
254 beq 1f
255 lwzu r0,4(r5)
256 lwzu r1,4(r5)
257 lwzu r2,4(r5)
258 lwzu r3,4(r5)
259 mtspr MAS0,r0
260 mtspr MAS1,r1
261 mtspr MAS2,r2
262 mtspr MAS3,r3
263 isync
264 msync
265 tlbwe
266 isync
267 addi r4,r4,-1
268 bdnz 0b
269
2701:
271#if (CFG_CCSRBAR_DEFAULT != CFG_CCSRBAR)
272 /* Special sequence needed to update CCSRBAR itself */
273 lis r4, CFG_CCSRBAR_DEFAULT@h
274 ori r4, r4, CFG_CCSRBAR_DEFAULT@l
275
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]276 lis r5, CFG_CCSRBAR@h
277 ori r5, r5, CFG_CCSRBAR@l
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]278 srwi r6,r5,12
279 stw r6, 0(r4)
280 isync
281
282 lis r5, 0xffff
283 ori r5,r5,0xf000
284 lwz r5, 0(r5)
285 isync
286
287 lis r3, CFG_CCSRBAR@h
288 lwz r5, CFG_CCSRBAR@l(r3)
289 isync
290#endif
291
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]292
293 /* set up local access windows, defined at board/<boardname>/init.S */
294 lis r7,CFG_CCSRBAR@h
295 ori r7,r7,CFG_CCSRBAR@l
296
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]297 bl law_entry
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]298 mr r6,r0
wdenk9aea9532004-08-01 23:02:45 +0000[diff] [blame]299 li r1,0x0007 /* 8 LAWs, but reserve one for boot-over-rio-or-pci */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]300 mtctr r1
301 lwzu r5,0(r6) /* how many windows we actually use */
302
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]303 li r2,0x0c28 /* the first pair is reserved for boot-over-rio-or-pci */
304 li r1,0x0c30
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]305
3060: cmpwi r5,0
307 beq 1f
308 lwzu r4,4(r6)
309 lwzu r3,4(r6)
310 stwx r4,r7,r2
311 stwx r3,r7,r1
312 addi r5,r5,-1
313 addi r2,r2,0x0020
314 addi r1,r1,0x0020
315 bdnz 0b
316
317 /* Jump out the last 4K page and continue to 'normal' start */
3181: bl 3f
319 b _start
320
3213: li r0,0
322 mtspr SRR1,r0 /* Keep things disabled for now */
323 mflr r1
324 mtspr SRR0,r1
325 rfi
326
327/*
328 * r3 - 1st arg to board_init(): IMMP pointer
329 * r4 - 2nd arg to board_init(): boot flag
330 */
331 .text
332 .long 0x27051956 /* U-BOOT Magic Number */
333 .globl version_string
334version_string:
335 .ascii U_BOOT_VERSION
336 .ascii " (", __DATE__, " - ", __TIME__, ")"
337 .ascii CONFIG_IDENT_STRING, "\0"
338
339 . = EXC_OFF_SYS_RESET
340 .globl _start
341_start:
342 /* Clear and set up some registers. */
343 li r0,0x0000
344 lis r1,0xffff
345 mtspr DEC,r0 /* prevent dec exceptions */
346 mttbl r0 /* prevent fit & wdt exceptions */
347 mttbu r0
348 mtspr TSR,r1 /* clear all timer exception status */
349 mtspr TCR,r0 /* disable all */
350 mtspr ESR,r0 /* clear exception syndrome register */
351 mtspr MCSR,r0 /* machine check syndrome register */
352 mtxer r0 /* clear integer exception register */
353 lis r1,0x0002 /* set CE bit (Critical Exceptions) */
354 ori r1,r1,0x1200 /* set ME/DE bit */
355 mtmsr r1 /* change MSR */
356 isync
357
358 /* Enable Time Base and Select Time Base Clock */
wdenk0ac6f8b2004-07-09 23:27:13 +0000[diff] [blame]359 lis r0,HID0_EMCP@h /* Enable machine check */
360 ori r0,r0,0x4000 /* time base is processor clock */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]361 mtspr HID0,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]362
363#if defined(CONFIG_ADDR_STREAMING)
wdenka57a4962003-10-26 22:52:58 +0000[diff] [blame]364 li r0,0x3000
365#else
366 li r0,0x1000
367#endif
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]368 mtspr HID1,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]369
370 /* Enable Branch Prediction */
371#if defined(CONFIG_BTB)
372 li r0,0x201 /* BBFI = 1, BPEN = 1 */
373 mtspr BUCSR,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]374#endif
375
376#if defined(CFG_INIT_DBCR)
377 lis r1,0xffff
378 ori r1,r1,0xffff
wdenk0ac6f8b2004-07-09 23:27:13 +0000[diff] [blame]379 mtspr DBSR,r1 /* Clear all status bits */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]380 lis r0,CFG_INIT_DBCR@h /* DBCR0[IDM] must be set */
381 ori r0,r0,CFG_INIT_DBCR@l
wdenk0ac6f8b2004-07-09 23:27:13 +0000[diff] [blame]382 mtspr DBCR0,r0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]383#endif
384
385/* L1 DCache is used for initial RAM */
386 mfspr r2, L1CSR0
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]387 ori r2, r2, 0x0003
388 oris r2, r2, 0x0001
389 mtspr L1CSR0, r2 /* enable/invalidate L1 Dcache */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]390 isync
391
392 /* Allocate Initial RAM in data cache.
393 */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]394 lis r3, CFG_INIT_RAM_ADDR@h
395 ori r3, r3, CFG_INIT_RAM_ADDR@l
396 li r2, 512 /* 512*32=16K */
397 mtctr r2
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]398 li r0, 0
3991:
400 dcbz r0, r3
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]401 dcbtls 0,r0, r3
402 addi r3, r3, 32
403 bdnz 1b
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]404
405#ifndef CFG_RAMBOOT
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]406 /* Calculate absolute address in FLASH and jump there */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]407 /*--------------------------------------------------------------*/
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]408 lis r3, CFG_MONITOR_BASE@h
409 ori r3, r3, CFG_MONITOR_BASE@l
410 addi r3, r3, in_flash - _start + EXC_OFF_SYS_RESET
411 mtlr r3
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]412 blr
413
414in_flash:
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]415#endif /* CFG_RAMBOOT */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]416
417 /* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache*/
418 lis r1,CFG_INIT_RAM_ADDR@h
419 ori r1,r1,CFG_INIT_SP_OFFSET@l
420
421 li r0,0
422 stwu r0,-4(r1)
423 stwu r0,-4(r1) /* Terminate call chain */
424
425 stwu r1,-8(r1) /* Save back chain and move SP */
426 lis r0,RESET_VECTOR@h /* Address of reset vector */
427 ori r0,r0, RESET_VECTOR@l
428 stwu r1,-8(r1) /* Save back chain and move SP */
429 stw r0,+12(r1) /* Save return addr (underflow vect) */
430
431 GET_GOT
432 bl cpu_init_f
433 bl icache_enable
434 bl board_init_f
wdenk0ac6f8b2004-07-09 23:27:13 +0000[diff] [blame]435 isync
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]436
437/* --FIXME-- machine check with MCSRRn and rfmci */
438
439 .globl _start_of_vectors
440_start_of_vectors:
441#if 0
442/* Critical input. */
443 CRIT_EXCEPTION(0x0100, CritcalInput, CritcalInputException)
444#endif
445/* Machine check --FIXME-- Should be MACH_EXCEPTION */
446 CRIT_EXCEPTION(0x0200, MachineCheck, MachineCheckException)
447
448/* Data Storage exception. */
449 STD_EXCEPTION(0x0300, DataStorage, UnknownException)
450
451/* Instruction Storage exception. */
452 STD_EXCEPTION(0x0400, InstStorage, UnknownException)
453
454/* External Interrupt exception. */
455 STD_EXCEPTION(0x0500, ExtInterrupt, UnknownException)
456
457/* Alignment exception. */
458 . = 0x0600
459Alignment:
460 EXCEPTION_PROLOG
461 mfspr r4,DAR
462 stw r4,_DAR(r21)
463 mfspr r5,DSISR
464 stw r5,_DSISR(r21)
465 addi r3,r1,STACK_FRAME_OVERHEAD
466 li r20,MSR_KERNEL
467 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
468 lwz r6,GOT(transfer_to_handler)
469 mtlr r6
470 blrl
471.L_Alignment:
472 .long AlignmentException - _start + EXC_OFF_SYS_RESET
473 .long int_return - _start + EXC_OFF_SYS_RESET
474
475/* Program check exception */
476 . = 0x0700
477ProgramCheck:
478 EXCEPTION_PROLOG
479 addi r3,r1,STACK_FRAME_OVERHEAD
480 li r20,MSR_KERNEL
481 rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
482 lwz r6,GOT(transfer_to_handler)
483 mtlr r6
484 blrl
485.L_ProgramCheck:
486 .long ProgramCheckException - _start + EXC_OFF_SYS_RESET
487 .long int_return - _start + EXC_OFF_SYS_RESET
488
489 /* No FPU on MPC85xx. This exception is not supposed to happen.
490 */
491 STD_EXCEPTION(0x0800, FPUnavailable, UnknownException)
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]492
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]493 . = 0x0900
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]494/*
495 * r0 - SYSCALL number
496 * r3-... arguments
497 */
498SystemCall:
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]499 addis r11,r0,0 /* get functions table addr */
500 ori r11,r11,0 /* Note: this code is patched in trap_init */
501 addis r12,r0,0 /* get number of functions */
502 ori r12,r12,0
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]503
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]504 cmplw 0, r0, r12
505 bge 1f
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]506
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]507 rlwinm r0,r0,2,0,31 /* fn_addr = fn_tbl[r0] */
508 add r11,r11,r0
509 lwz r11,0(r11)
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]510
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]511 li r20,0xd00-4 /* Get stack pointer */
512 lwz r12,0(r20)
513 subi r12,r12,12 /* Adjust stack pointer */
514 li r0,0xc00+_end_back-SystemCall
515 cmplw 0, r0, r12 /* Check stack overflow */
516 bgt 1f
517 stw r12,0(r20)
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]518
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]519 mflr r0
520 stw r0,0(r12)
521 mfspr r0,SRR0
522 stw r0,4(r12)
523 mfspr r0,SRR1
524 stw r0,8(r12)
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]525
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]526 li r12,0xc00+_back-SystemCall
527 mtlr r12
528 mtspr SRR0,r11
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]529
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]5301: SYNC
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]531 rfi
532_back:
533
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]534 mfmsr r11 /* Disable interrupts */
535 li r12,0
536 ori r12,r12,MSR_EE
537 andc r11,r11,r12
538 SYNC /* Some chip revs need this... */
539 mtmsr r11
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]540 SYNC
541
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]542 li r12,0xd00-4 /* restore regs */
543 lwz r12,0(r12)
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]544
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]545 lwz r11,0(r12)
546 mtlr r11
547 lwz r11,4(r12)
548 mtspr SRR0,r11
549 lwz r11,8(r12)
550 mtspr SRR1,r11
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]551
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]552 addi r12,r12,12 /* Adjust stack pointer */
553 li r20,0xd00-4
554 stw r12,0(r20)
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]555
556 SYNC
557 rfi
558_end_back:
559
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]560 STD_EXCEPTION(0x0a00, Decrementer, timer_interrupt)
561 STD_EXCEPTION(0x0b00, IntervalTimer, UnknownException)
562 STD_EXCEPTION(0x0c00, WatchdogTimer, UnknownException)
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]563
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]564 STD_EXCEPTION(0x0d00, DataTLBError, UnknownException)
565 STD_EXCEPTION(0x0e00, InstructionTLBError, UnknownException)
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]566
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]567 CRIT_EXCEPTION(0x0f00, DebugBreakpoint, DebugException )
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]568
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]569 .globl _end_of_vectors
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]570_end_of_vectors:
571
572
573 . = 0x2100
574
575/*
576 * This code finishes saving the registers to the exception frame
577 * and jumps to the appropriate handler for the exception.
578 * Register r21 is pointer into trap frame, r1 has new stack pointer.
579 */
580 .globl transfer_to_handler
581transfer_to_handler:
582 stw r22,_NIP(r21)
583 lis r22,MSR_POW@h
584 andc r23,r23,r22
585 stw r23,_MSR(r21)
586 SAVE_GPR(7, r21)
587 SAVE_4GPRS(8, r21)
588 SAVE_8GPRS(12, r21)
589 SAVE_8GPRS(24, r21)
590
591 mflr r23
592 andi. r24,r23,0x3f00 /* get vector offset */
593 stw r24,TRAP(r21)
594 li r22,0
595 stw r22,RESULT(r21)
596 mtspr SPRG2,r22 /* r1 is now kernel sp */
597
598 lwz r24,0(r23) /* virtual address of handler */
599 lwz r23,4(r23) /* where to go when done */
600 mtspr SRR0,r24
601 mtspr SRR1,r20
602 mtlr r23
603 SYNC
604 rfi /* jump to handler, enable MMU */
605
606int_return:
607 mfmsr r28 /* Disable interrupts */
608 li r4,0
609 ori r4,r4,MSR_EE
610 andc r28,r28,r4
611 SYNC /* Some chip revs need this... */
612 mtmsr r28
613 SYNC
614 lwz r2,_CTR(r1)
615 lwz r0,_LINK(r1)
616 mtctr r2
617 mtlr r0
618 lwz r2,_XER(r1)
619 lwz r0,_CCR(r1)
620 mtspr XER,r2
621 mtcrf 0xFF,r0
622 REST_10GPRS(3, r1)
623 REST_10GPRS(13, r1)
624 REST_8GPRS(23, r1)
625 REST_GPR(31, r1)
626 lwz r2,_NIP(r1) /* Restore environment */
627 lwz r0,_MSR(r1)
628 mtspr SRR0,r2
629 mtspr SRR1,r0
630 lwz r0,GPR0(r1)
631 lwz r2,GPR2(r1)
632 lwz r1,GPR1(r1)
633 SYNC
634 rfi
635
636crit_return:
637 mfmsr r28 /* Disable interrupts */
638 li r4,0
639 ori r4,r4,MSR_EE
640 andc r28,r28,r4
641 SYNC /* Some chip revs need this... */
642 mtmsr r28
643 SYNC
644 lwz r2,_CTR(r1)
645 lwz r0,_LINK(r1)
646 mtctr r2
647 mtlr r0
648 lwz r2,_XER(r1)
649 lwz r0,_CCR(r1)
650 mtspr XER,r2
651 mtcrf 0xFF,r0
652 REST_10GPRS(3, r1)
653 REST_10GPRS(13, r1)
654 REST_8GPRS(23, r1)
655 REST_GPR(31, r1)
656 lwz r2,_NIP(r1) /* Restore environment */
657 lwz r0,_MSR(r1)
658 mtspr 990,r2 /* SRR2 */
659 mtspr 991,r0 /* SRR3 */
660 lwz r0,GPR0(r1)
661 lwz r2,GPR2(r1)
662 lwz r1,GPR1(r1)
663 SYNC
664 rfci
665
666/* Cache functions.
667*/
668invalidate_icache:
669 mfspr r0,L1CSR1
670 ori r0,r0,0x0002
671 mtspr L1CSR1,r0
672 isync
673 blr /* entire I cache */
674
675invalidate_dcache:
676 mfspr r0,L1CSR0
677 ori r0,r0,0x0002
678 msync
679 isync
680 mtspr L1CSR0,r0
681 isync
682 blr
683
684 .globl icache_enable
685icache_enable:
686 mflr r8
687 bl invalidate_icache
688 mtlr r8
689 isync
690 mfspr r4,L1CSR1
691 ori r4,r4,0x0001
692 oris r4,r4,0x0001
693 mtspr L1CSR1,r4
694 isync
695 blr
696
697 .globl icache_disable
698icache_disable:
699 mfspr r0,L1CSR1
700 lis r1,0xfffffffe@h
701 ori r1,r1,0xfffffffe@l
702 and r0,r0,r1
703 mtspr L1CSR1,r0
704 isync
705 blr
706
707 .globl icache_status
708icache_status:
709 mfspr r3,L1CSR1
710 srwi r3, r3, 31 /* >>31 => select bit 0 */
711 blr
712
713 .globl dcache_enable
714dcache_enable:
715 mflr r8
716 bl invalidate_dcache
717 mtlr r8
718 isync
719 mfspr r0,L1CSR0
720 ori r0,r0,0x0001
721 oris r0,r0,0x0001
722 msync
723 isync
724 mtspr L1CSR0,r0
725 isync
726 blr
727
728 .globl dcache_disable
729dcache_disable:
730 mfspr r0,L1CSR0
731 lis r1,0xfffffffe@h
732 ori r1,r1,0xfffffffe@l
733 and r0,r0,r1
734 msync
735 isync
736 mtspr L1CSR0,r0
737 isync
738 blr
739
740 .globl dcache_status
741dcache_status:
742 mfspr r3,L1CSR0
743 srwi r3, r3, 31 /* >>31 => select bit 0 */
744 blr
745
746 .globl get_pir
747get_pir:
748 mfspr r3, PIR
749 blr
750
751 .globl get_pvr
752get_pvr:
753 mfspr r3, PVR
754 blr
755
wdenk97d80fc2004-06-09 00:34:46 +0000[diff] [blame]756 .globl get_svr
757get_svr:
758 mfspr r3, SVR
759 blr
760
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]761 .globl wr_tcr
762wr_tcr:
763 mtspr TCR, r3
764 blr
765
766/*------------------------------------------------------------------------------- */
767/* Function: in8 */
768/* Description: Input 8 bits */
769/*------------------------------------------------------------------------------- */
770 .globl in8
771in8:
772 lbz r3,0x0000(r3)
773 blr
774
775/*------------------------------------------------------------------------------- */
776/* Function: out8 */
777/* Description: Output 8 bits */
778/*------------------------------------------------------------------------------- */
779 .globl out8
780out8:
781 stb r4,0x0000(r3)
782 blr
783
784/*------------------------------------------------------------------------------- */
785/* Function: out16 */
786/* Description: Output 16 bits */
787/*------------------------------------------------------------------------------- */
788 .globl out16
789out16:
790 sth r4,0x0000(r3)
791 blr
792
793/*------------------------------------------------------------------------------- */
794/* Function: out16r */
795/* Description: Byte reverse and output 16 bits */
796/*------------------------------------------------------------------------------- */
797 .globl out16r
798out16r:
799 sthbrx r4,r0,r3
800 blr
801
802/*------------------------------------------------------------------------------- */
803/* Function: out32 */
804/* Description: Output 32 bits */
805/*------------------------------------------------------------------------------- */
806 .globl out32
807out32:
808 stw r4,0x0000(r3)
809 blr
810
811/*------------------------------------------------------------------------------- */
812/* Function: out32r */
813/* Description: Byte reverse and output 32 bits */
814/*------------------------------------------------------------------------------- */
815 .globl out32r
816out32r:
817 stwbrx r4,r0,r3
818 blr
819
820/*------------------------------------------------------------------------------- */
821/* Function: in16 */
822/* Description: Input 16 bits */
823/*------------------------------------------------------------------------------- */
824 .globl in16
825in16:
826 lhz r3,0x0000(r3)
827 blr
828
829/*------------------------------------------------------------------------------- */
830/* Function: in16r */
831/* Description: Input 16 bits and byte reverse */
832/*------------------------------------------------------------------------------- */
833 .globl in16r
834in16r:
835 lhbrx r3,r0,r3
836 blr
837
838/*------------------------------------------------------------------------------- */
839/* Function: in32 */
840/* Description: Input 32 bits */
841/*------------------------------------------------------------------------------- */
842 .globl in32
843in32:
844 lwz 3,0x0000(3)
845 blr
846
847/*------------------------------------------------------------------------------- */
848/* Function: in32r */
849/* Description: Input 32 bits and byte reverse */
850/*------------------------------------------------------------------------------- */
851 .globl in32r
852in32r:
853 lwbrx r3,r0,r3
854 blr
855
856/*------------------------------------------------------------------------------- */
857/* Function: ppcDcbf */
858/* Description: Data Cache block flush */
859/* Input: r3 = effective address */
860/* Output: none. */
861/*------------------------------------------------------------------------------- */
862 .globl ppcDcbf
863ppcDcbf:
864 dcbf r0,r3
865 blr
866
867/*------------------------------------------------------------------------------- */
868/* Function: ppcDcbi */
869/* Description: Data Cache block Invalidate */
870/* Input: r3 = effective address */
871/* Output: none. */
872/*------------------------------------------------------------------------------- */
873 .globl ppcDcbi
874ppcDcbi:
875 dcbi r0,r3
876 blr
877
wdenk0ac6f8b2004-07-09 23:27:13 +0000[diff] [blame]878/*--------------------------------------------------------------------------
879 * Function: ppcDcbz
880 * Description: Data Cache block zero.
881 * Input: r3 = effective address
882 * Output: none.
883 *-------------------------------------------------------------------------- */
884
885 .globl ppcDcbz
886ppcDcbz:
887 dcbz r0,r3
888 blr
889
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]890/*------------------------------------------------------------------------------- */
891/* Function: ppcSync */
892/* Description: Processor Synchronize */
893/* Input: none. */
894/* Output: none. */
895/*------------------------------------------------------------------------------- */
896 .globl ppcSync
897ppcSync:
898 sync
899 blr
900
901/*------------------------------------------------------------------------------*/
902
903/*
904 * void relocate_code (addr_sp, gd, addr_moni)
905 *
906 * This "function" does not return, instead it continues in RAM
907 * after relocating the monitor code.
908 *
909 * r3 = dest
910 * r4 = src
911 * r5 = length in bytes
912 * r6 = cachelinesize
913 */
914 .globl relocate_code
915relocate_code:
916 mr r1, r3 /* Set new stack pointer */
917 mr r9, r4 /* Save copy of Init Data pointer */
918 mr r10, r5 /* Save copy of Destination Address */
919
920 mr r3, r5 /* Destination Address */
921 lis r4, CFG_MONITOR_BASE@h /* Source Address */
922 ori r4, r4, CFG_MONITOR_BASE@l
923 lwz r5,GOT(__init_end)
924 sub r5,r5,r4
925 li r6, CFG_CACHELINE_SIZE /* Cache Line Size */
926
927 /*
928 * Fix GOT pointer:
929 *
930 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
931 *
932 * Offset:
933 */
934 sub r15, r10, r4
935
936 /* First our own GOT */
937 add r14, r14, r15
938 /* the the one used by the C code */
939 add r30, r30, r15
940
941 /*
942 * Now relocate code
943 */
944
945 cmplw cr1,r3,r4
946 addi r0,r5,3
947 srwi. r0,r0,2
948 beq cr1,4f /* In place copy is not necessary */
949 beq 7f /* Protect against 0 count */
950 mtctr r0
951 bge cr1,2f
952
953 la r8,-4(r4)
954 la r7,-4(r3)
9551: lwzu r0,4(r8)
956 stwu r0,4(r7)
957 bdnz 1b
958 b 4f
959
9602: slwi r0,r0,2
961 add r8,r4,r0
962 add r7,r3,r0
9633: lwzu r0,-4(r8)
964 stwu r0,-4(r7)
965 bdnz 3b
966
967/*
968 * Now flush the cache: note that we must start from a cache aligned
969 * address. Otherwise we might miss one cache line.
970 */
9714: cmpwi r6,0
972 add r5,r3,r5
973 beq 7f /* Always flush prefetch queue in any case */
974 subi r0,r6,1
975 andc r3,r3,r0
976 mr r4,r3
9775: dcbst 0,r4
978 add r4,r4,r6
979 cmplw r4,r5
980 blt 5b
981 sync /* Wait for all dcbst to complete on bus */
982 mr r4,r3
9836: icbi 0,r4
984 add r4,r4,r6
985 cmplw r4,r5
986 blt 6b
9877: sync /* Wait for all icbi to complete on bus */
988 isync
989
990/*
991 * We are done. Do not return, instead branch to second part of board
992 * initialization, now running from RAM.
993 */
994
995 addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET
996 mtlr r0
997 blr /* NEVER RETURNS! */
998
999in_ram:
1000
1001 /*
1002 * Relocation Function, r14 point to got2+0x8000
1003 *
1004 * Adjust got2 pointers, no need to check for 0, this code
1005 * already puts a few entries in the table.
1006 */
1007 li r0,__got2_entries@sectoff@l
1008 la r3,GOT(_GOT2_TABLE_)
1009 lwz r11,GOT(_GOT2_TABLE_)
1010 mtctr r0
1011 sub r11,r3,r11
1012 addi r3,r3,-4
10131: lwzu r0,4(r3)
1014 add r0,r0,r11
1015 stw r0,0(r3)
1016 bdnz 1b
1017
1018 /*
1019 * Now adjust the fixups and the pointers to the fixups
1020 * in case we need to move ourselves again.
1021 */
10222: li r0,__fixup_entries@sectoff@l
1023 lwz r3,GOT(_FIXUP_TABLE_)
1024 cmpwi r0,0
1025 mtctr r0
1026 addi r3,r3,-4
1027 beq 4f
10283: lwzu r4,4(r3)
1029 lwzux r0,r4,r11
1030 add r0,r0,r11
1031 stw r10,0(r3)
1032 stw r0,0(r4)
1033 bdnz 3b
10344:
1035clear_bss:
1036 /*
1037 * Now clear BSS segment
1038 */
1039 lwz r3,GOT(__bss_start)
1040 lwz r4,GOT(_end)
1041
1042 cmplw 0, r3, r4
1043 beq 6f
1044
1045 li r0, 0
10465:
1047 stw r0, 0(r3)
1048 addi r3, r3, 4
1049 cmplw 0, r3, r4
1050 bne 5b
10516:
1052
1053 mr r3, r9 /* Init Data pointer */
1054 mr r4, r10 /* Destination Address */
1055 bl board_init_r
1056
1057 /*
1058 * Copy exception vector code to low memory
1059 *
1060 * r3: dest_addr
1061 * r7: source address, r8: end address, r9: target address
1062 */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]1063 .globl trap_init
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]1064trap_init:
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]1065 lwz r7, GOT(_start)
1066 lwz r8, GOT(_end_of_vectors)
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]1067
1068 li r9, 0x100 /* reset vector always at 0x100 */
1069
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]1070 cmplw 0, r7, r8
1071 bgelr /* return if r7>=r8 - just in case */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]1072
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]1073 mflr r4 /* save link register */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]10741:
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]1075 lwz r0, 0(r7)
1076 stw r0, 0(r9)
1077 addi r7, r7, 4
1078 addi r9, r9, 4
1079 cmplw 0, r7, r8
1080 bne 1b
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]1081
1082 /*
1083 * relocate `hdlr' and `int_return' entries
1084 */
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]1085 li r7, .L_MachineCheck - _start + EXC_OFF_SYS_RESET
1086 bl trap_reloc
1087 li r7, .L_DataStorage - _start + EXC_OFF_SYS_RESET
1088 bl trap_reloc
1089 li r7, .L_InstStorage - _start + EXC_OFF_SYS_RESET
1090 bl trap_reloc
1091 li r7, .L_ExtInterrupt - _start + EXC_OFF_SYS_RESET
1092 bl trap_reloc
1093 li r7, .L_Alignment - _start + EXC_OFF_SYS_RESET
1094 bl trap_reloc
1095 li r7, .L_ProgramCheck - _start + EXC_OFF_SYS_RESET
1096 bl trap_reloc
1097 li r7, .L_FPUnavailable - _start + EXC_OFF_SYS_RESET
1098 bl trap_reloc
1099 li r7, .L_Decrementer - _start + EXC_OFF_SYS_RESET
1100 bl trap_reloc
1101 li r7, .L_IntervalTimer - _start + EXC_OFF_SYS_RESET
1102 li r8, _end_of_vectors - _start + EXC_OFF_SYS_RESET
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]11032:
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]1104 bl trap_reloc
1105 addi r7, r7, 0x100 /* next exception vector */
1106 cmplw 0, r7, r8
1107 blt 2b
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]1108
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]1109 lis r7,0x0
1110 mtspr IVPR, r7
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]1111
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]1112 mtlr r4 /* restore link register */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]1113 blr
1114
1115 /*
1116 * Function: relocate entries for one exception vector
1117 */
1118trap_reloc:
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]1119 lwz r0, 0(r7) /* hdlr ... */
1120 add r0, r0, r3 /* ... += dest_addr */
1121 stw r0, 0(r7)
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]1122
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]1123 lwz r0, 4(r7) /* int_return ... */
1124 add r0, r0, r3 /* ... += dest_addr */
1125 stw r0, 4(r7)
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]1126
1127 blr
1128
1129#ifdef CFG_INIT_RAM_LOCK
1130.globl unlock_ram_in_cache
1131unlock_ram_in_cache:
1132 /* invalidate the INIT_RAM section */
1133 lis r3, (CFG_INIT_RAM_ADDR & ~31)@h
1134 ori r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l
1135 li r2,512
1136 mtctr r2
11371: icbi r0, r3
1138 dcbi r0, r3
1139 addi r3, r3, 32
1140 bdnz 1b
wdenk343117b2005-05-13 22:49:36 +0000[diff] [blame]1141 sync /* Wait for all icbi to complete on bus */
wdenk42d1f032003-10-15 23:53:47 +0000[diff] [blame]1142 isync
1143 blr
1144#endif