Commit | Line | Data |
---|---|---|
14cf11af | 1 | /* |
14cf11af PM |
2 | * Kernel execution entry point code. |
3 | * | |
4 | * Copyright (c) 1995-1996 Gary Thomas <gdt@linuxppc.org> | |
3c5df5c2 | 5 | * Initial PowerPC version. |
14cf11af | 6 | * Copyright (c) 1996 Cort Dougan <cort@cs.nmt.edu> |
3c5df5c2 | 7 | * Rewritten for PReP |
14cf11af | 8 | * Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au> |
3c5df5c2 | 9 | * Low-level exception handers, MMU support, and rewrite. |
14cf11af | 10 | * Copyright (c) 1997 Dan Malek <dmalek@jlc.net> |
3c5df5c2 | 11 | * PowerPC 8xx modifications. |
14cf11af | 12 | * Copyright (c) 1998-1999 TiVo, Inc. |
3c5df5c2 | 13 | * PowerPC 403GCX modifications. |
14cf11af | 14 | * Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu> |
3c5df5c2 | 15 | * PowerPC 403GCX/405GP modifications. |
14cf11af PM |
16 | * Copyright 2000 MontaVista Software Inc. |
17 | * PPC405 modifications | |
3c5df5c2 KG |
18 | * PowerPC 403GCX/405GP modifications. |
19 | * Author: MontaVista Software, Inc. | |
20 | * frank_rowand@mvista.com or source@mvista.com | |
21 | * debbie_chu@mvista.com | |
14cf11af | 22 | * Copyright 2002-2004 MontaVista Software, Inc. |
3c5df5c2 | 23 | * PowerPC 44x support, Matt Porter <mporter@kernel.crashing.org> |
14cf11af | 24 | * Copyright 2004 Freescale Semiconductor, Inc |
3c5df5c2 | 25 | * PowerPC e500 modifications, Kumar Gala <galak@kernel.crashing.org> |
14cf11af PM |
26 | * |
27 | * This program is free software; you can redistribute it and/or modify it | |
28 | * under the terms of the GNU General Public License as published by the | |
29 | * Free Software Foundation; either version 2 of the License, or (at your | |
30 | * option) any later version. | |
31 | */ | |
32 | ||
e7039845 | 33 | #include <linux/init.h> |
14cf11af PM |
34 | #include <linux/threads.h> |
35 | #include <asm/processor.h> | |
36 | #include <asm/page.h> | |
37 | #include <asm/mmu.h> | |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/cputable.h> | |
40 | #include <asm/thread_info.h> | |
41 | #include <asm/ppc_asm.h> | |
42 | #include <asm/asm-offsets.h> | |
fc4033b2 | 43 | #include <asm/cache.h> |
46f52210 | 44 | #include <asm/ptrace.h> |
14cf11af PM |
45 | #include "head_booke.h" |
46 | ||
47 | /* As with the other PowerPC ports, it is expected that when code | |
48 | * execution begins here, the following registers contain valid, yet | |
49 | * optional, information: | |
50 | * | |
51 | * r3 - Board info structure pointer (DRAM, frequency, MAC address, etc.) | |
52 | * r4 - Starting address of the init RAM disk | |
53 | * r5 - Ending address of the init RAM disk | |
54 | * r6 - Start of kernel command line string (e.g. "mem=128") | |
55 | * r7 - End of kernel command line string | |
56 | * | |
57 | */ | |
e7039845 | 58 | __HEAD |
748a7683 KG |
59 | _ENTRY(_stext); |
60 | _ENTRY(_start); | |
14cf11af PM |
61 | /* |
62 | * Reserve a word at a fixed location to store the address | |
63 | * of abatron_pteptrs | |
64 | */ | |
65 | nop | |
66 | /* | |
67 | * Save parameters we are passed | |
68 | */ | |
69 | mr r31,r3 | |
70 | mr r30,r4 | |
71 | mr r29,r5 | |
72 | mr r28,r6 | |
73 | mr r27,r7 | |
0aef996b | 74 | li r25,0 /* phys kernel start (low) */ |
14cf11af | 75 | li r24,0 /* CPU number */ |
0aef996b | 76 | li r23,0 /* phys kernel start (high) */ |
14cf11af PM |
77 | |
78 | /* We try to not make any assumptions about how the boot loader | |
79 | * setup or used the TLBs. We invalidate all mappings from the | |
80 | * boot loader and load a single entry in TLB1[0] to map the | |
e8b63761 DF |
81 | * first 64M of kernel memory. Any boot info passed from the |
82 | * bootloader needs to live in this first 64M. | |
14cf11af PM |
83 | * |
84 | * Requirement on bootloader: | |
85 | * - The page we're executing in needs to reside in TLB1 and | |
86 | * have IPROT=1. If not an invalidate broadcast could | |
87 | * evict the entry we're currently executing in. | |
88 | * | |
89 | * r3 = Index of TLB1 were executing in | |
90 | * r4 = Current MSR[IS] | |
91 | * r5 = Index of TLB1 temp mapping | |
92 | * | |
93 | * Later in mapin_ram we will correctly map lowmem, and resize TLB1[0] | |
94 | * if needed | |
95 | */ | |
96 | ||
d5b26db2 | 97 | _ENTRY(__early_start) |
105c31df | 98 | |
b3df895a | 99 | #define ENTRY_MAPPING_BOOT_SETUP |
7c08ce71 | 100 | #include "fsl_booke_entry_mapping.S" |
b3df895a | 101 | #undef ENTRY_MAPPING_BOOT_SETUP |
14cf11af PM |
102 | |
103 | /* Establish the interrupt vector offsets */ | |
104 | SET_IVOR(0, CriticalInput); | |
105 | SET_IVOR(1, MachineCheck); | |
106 | SET_IVOR(2, DataStorage); | |
107 | SET_IVOR(3, InstructionStorage); | |
108 | SET_IVOR(4, ExternalInput); | |
109 | SET_IVOR(5, Alignment); | |
110 | SET_IVOR(6, Program); | |
111 | SET_IVOR(7, FloatingPointUnavailable); | |
112 | SET_IVOR(8, SystemCall); | |
113 | SET_IVOR(9, AuxillaryProcessorUnavailable); | |
114 | SET_IVOR(10, Decrementer); | |
115 | SET_IVOR(11, FixedIntervalTimer); | |
116 | SET_IVOR(12, WatchdogTimer); | |
117 | SET_IVOR(13, DataTLBError); | |
118 | SET_IVOR(14, InstructionTLBError); | |
eb0cd5fd | 119 | SET_IVOR(15, DebugCrit); |
14cf11af PM |
120 | |
121 | /* Establish the interrupt vector base */ | |
122 | lis r4,interrupt_base@h /* IVPR only uses the high 16-bits */ | |
123 | mtspr SPRN_IVPR,r4 | |
124 | ||
125 | /* Setup the defaults for TLB entries */ | |
d66c82ea | 126 | li r2,(MAS4_TSIZED(BOOK3E_PAGESZ_4K))@l |
14cf11af PM |
127 | #ifdef CONFIG_E200 |
128 | oris r2,r2,MAS4_TLBSELD(1)@h | |
129 | #endif | |
3c5df5c2 | 130 | mtspr SPRN_MAS4, r2 |
14cf11af PM |
131 | |
132 | #if 0 | |
133 | /* Enable DOZE */ | |
134 | mfspr r2,SPRN_HID0 | |
135 | oris r2,r2,HID0_DOZE@h | |
136 | mtspr SPRN_HID0, r2 | |
137 | #endif | |
14cf11af PM |
138 | |
139 | #if !defined(CONFIG_BDI_SWITCH) | |
140 | /* | |
141 | * The Abatron BDI JTAG debugger does not tolerate others | |
142 | * mucking with the debug registers. | |
143 | */ | |
144 | lis r2,DBCR0_IDM@h | |
145 | mtspr SPRN_DBCR0,r2 | |
a7cb0337 | 146 | isync |
14cf11af PM |
147 | /* clear any residual debug events */ |
148 | li r2,-1 | |
149 | mtspr SPRN_DBSR,r2 | |
150 | #endif | |
151 | ||
d5b26db2 KG |
152 | #ifdef CONFIG_SMP |
153 | /* Check to see if we're the second processor, and jump | |
154 | * to the secondary_start code if so | |
155 | */ | |
2ed38b23 MM |
156 | lis r24, boot_cpuid@h |
157 | ori r24, r24, boot_cpuid@l | |
158 | lwz r24, 0(r24) | |
159 | cmpwi r24, -1 | |
160 | mfspr r24,SPRN_PIR | |
d5b26db2 KG |
161 | bne __secondary_start |
162 | #endif | |
163 | ||
14cf11af PM |
164 | /* |
165 | * This is where the main kernel code starts. | |
166 | */ | |
167 | ||
168 | /* ptr to current */ | |
169 | lis r2,init_task@h | |
170 | ori r2,r2,init_task@l | |
171 | ||
172 | /* ptr to current thread */ | |
173 | addi r4,r2,THREAD /* init task's THREAD */ | |
ee43eb78 | 174 | mtspr SPRN_SPRG_THREAD,r4 |
14cf11af PM |
175 | |
176 | /* stack */ | |
177 | lis r1,init_thread_union@h | |
178 | ori r1,r1,init_thread_union@l | |
179 | li r0,0 | |
180 | stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1) | |
181 | ||
2ed38b23 MM |
182 | rlwinm r22,r1,0,0,31-THREAD_SHIFT /* current thread_info */ |
183 | stw r24, TI_CPU(r22) | |
184 | ||
14cf11af PM |
185 | bl early_init |
186 | ||
37dd2bad KG |
187 | #ifdef CONFIG_RELOCATABLE |
188 | lis r3,kernstart_addr@ha | |
189 | la r3,kernstart_addr@l(r3) | |
190 | #ifdef CONFIG_PHYS_64BIT | |
191 | stw r23,0(r3) | |
192 | stw r25,4(r3) | |
193 | #else | |
194 | stw r25,0(r3) | |
195 | #endif | |
196 | #endif | |
197 | ||
14cf11af PM |
198 | /* |
199 | * Decide what sort of machine this is and initialize the MMU. | |
200 | */ | |
201 | mr r3,r31 | |
202 | mr r4,r30 | |
203 | mr r5,r29 | |
204 | mr r6,r28 | |
205 | mr r7,r27 | |
206 | bl machine_init | |
207 | bl MMU_init | |
208 | ||
209 | /* Setup PTE pointers for the Abatron bdiGDB */ | |
210 | lis r6, swapper_pg_dir@h | |
211 | ori r6, r6, swapper_pg_dir@l | |
212 | lis r5, abatron_pteptrs@h | |
213 | ori r5, r5, abatron_pteptrs@l | |
214 | lis r4, KERNELBASE@h | |
215 | ori r4, r4, KERNELBASE@l | |
216 | stw r5, 0(r4) /* Save abatron_pteptrs at a fixed location */ | |
217 | stw r6, 0(r5) | |
218 | ||
219 | /* Let's move on */ | |
220 | lis r4,start_kernel@h | |
221 | ori r4,r4,start_kernel@l | |
222 | lis r3,MSR_KERNEL@h | |
223 | ori r3,r3,MSR_KERNEL@l | |
224 | mtspr SPRN_SRR0,r4 | |
225 | mtspr SPRN_SRR1,r3 | |
226 | rfi /* change context and jump to start_kernel */ | |
227 | ||
228 | /* Macros to hide the PTE size differences | |
229 | * | |
230 | * FIND_PTE -- walks the page tables given EA & pgdir pointer | |
231 | * r10 -- EA of fault | |
232 | * r11 -- PGDIR pointer | |
233 | * r12 -- free | |
234 | * label 2: is the bailout case | |
235 | * | |
236 | * if we find the pte (fall through): | |
237 | * r11 is low pte word | |
238 | * r12 is pointer to the pte | |
239 | */ | |
240 | #ifdef CONFIG_PTE_64BIT | |
14cf11af | 241 | #define FIND_PTE \ |
3c5df5c2 | 242 | rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \ |
14cf11af PM |
243 | lwzx r11, r12, r11; /* Get pgd/pmd entry */ \ |
244 | rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \ | |
245 | beq 2f; /* Bail if no table */ \ | |
246 | rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \ | |
247 | lwz r11, 4(r12); /* Get pte entry */ | |
248 | #else | |
14cf11af PM |
249 | #define FIND_PTE \ |
250 | rlwimi r11, r10, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \ | |
251 | lwz r11, 0(r11); /* Get L1 entry */ \ | |
252 | rlwinm. r12, r11, 0, 0, 19; /* Extract L2 (pte) base address */ \ | |
253 | beq 2f; /* Bail if no table */ \ | |
254 | rlwimi r12, r10, 22, 20, 29; /* Compute PTE address */ \ | |
255 | lwz r11, 0(r12); /* Get Linux PTE */ | |
256 | #endif | |
257 | ||
258 | /* | |
259 | * Interrupt vector entry code | |
260 | * | |
261 | * The Book E MMUs are always on so we don't need to handle | |
262 | * interrupts in real mode as with previous PPC processors. In | |
263 | * this case we handle interrupts in the kernel virtual address | |
264 | * space. | |
265 | * | |
266 | * Interrupt vectors are dynamically placed relative to the | |
267 | * interrupt prefix as determined by the address of interrupt_base. | |
268 | * The interrupt vectors offsets are programmed using the labels | |
269 | * for each interrupt vector entry. | |
270 | * | |
271 | * Interrupt vectors must be aligned on a 16 byte boundary. | |
272 | * We align on a 32 byte cache line boundary for good measure. | |
273 | */ | |
274 | ||
275 | interrupt_base: | |
276 | /* Critical Input Interrupt */ | |
dc1c1ca3 | 277 | CRITICAL_EXCEPTION(0x0100, CriticalInput, unknown_exception) |
14cf11af PM |
278 | |
279 | /* Machine Check Interrupt */ | |
280 | #ifdef CONFIG_E200 | |
281 | /* no RFMCI, MCSRRs on E200 */ | |
dc1c1ca3 | 282 | CRITICAL_EXCEPTION(0x0200, MachineCheck, machine_check_exception) |
14cf11af | 283 | #else |
dc1c1ca3 | 284 | MCHECK_EXCEPTION(0x0200, MachineCheck, machine_check_exception) |
14cf11af PM |
285 | #endif |
286 | ||
287 | /* Data Storage Interrupt */ | |
288 | START_EXCEPTION(DataStorage) | |
6cfd8990 KG |
289 | NORMAL_EXCEPTION_PROLOG |
290 | mfspr r5,SPRN_ESR /* Grab the ESR, save it, pass arg3 */ | |
291 | stw r5,_ESR(r11) | |
292 | mfspr r4,SPRN_DEAR /* Grab the DEAR, save it, pass arg2 */ | |
293 | andis. r10,r5,(ESR_ILK|ESR_DLK)@h | |
294 | bne 1f | |
295 | EXC_XFER_EE_LITE(0x0300, handle_page_fault) | |
296 | 1: | |
297 | addi r3,r1,STACK_FRAME_OVERHEAD | |
298 | EXC_XFER_EE_LITE(0x0300, CacheLockingException) | |
14cf11af PM |
299 | |
300 | /* Instruction Storage Interrupt */ | |
301 | INSTRUCTION_STORAGE_EXCEPTION | |
302 | ||
303 | /* External Input Interrupt */ | |
304 | EXCEPTION(0x0500, ExternalInput, do_IRQ, EXC_XFER_LITE) | |
305 | ||
306 | /* Alignment Interrupt */ | |
307 | ALIGNMENT_EXCEPTION | |
308 | ||
309 | /* Program Interrupt */ | |
310 | PROGRAM_EXCEPTION | |
311 | ||
312 | /* Floating Point Unavailable Interrupt */ | |
313 | #ifdef CONFIG_PPC_FPU | |
314 | FP_UNAVAILABLE_EXCEPTION | |
315 | #else | |
316 | #ifdef CONFIG_E200 | |
317 | /* E200 treats 'normal' floating point instructions as FP Unavail exception */ | |
dc1c1ca3 | 318 | EXCEPTION(0x0800, FloatingPointUnavailable, program_check_exception, EXC_XFER_EE) |
14cf11af | 319 | #else |
dc1c1ca3 | 320 | EXCEPTION(0x0800, FloatingPointUnavailable, unknown_exception, EXC_XFER_EE) |
14cf11af PM |
321 | #endif |
322 | #endif | |
323 | ||
324 | /* System Call Interrupt */ | |
325 | START_EXCEPTION(SystemCall) | |
326 | NORMAL_EXCEPTION_PROLOG | |
327 | EXC_XFER_EE_LITE(0x0c00, DoSyscall) | |
328 | ||
329 | /* Auxillary Processor Unavailable Interrupt */ | |
dc1c1ca3 | 330 | EXCEPTION(0x2900, AuxillaryProcessorUnavailable, unknown_exception, EXC_XFER_EE) |
14cf11af PM |
331 | |
332 | /* Decrementer Interrupt */ | |
333 | DECREMENTER_EXCEPTION | |
334 | ||
335 | /* Fixed Internal Timer Interrupt */ | |
336 | /* TODO: Add FIT support */ | |
dc1c1ca3 | 337 | EXCEPTION(0x3100, FixedIntervalTimer, unknown_exception, EXC_XFER_EE) |
14cf11af PM |
338 | |
339 | /* Watchdog Timer Interrupt */ | |
340 | #ifdef CONFIG_BOOKE_WDT | |
341 | CRITICAL_EXCEPTION(0x3200, WatchdogTimer, WatchdogException) | |
342 | #else | |
dc1c1ca3 | 343 | CRITICAL_EXCEPTION(0x3200, WatchdogTimer, unknown_exception) |
14cf11af PM |
344 | #endif |
345 | ||
346 | /* Data TLB Error Interrupt */ | |
347 | START_EXCEPTION(DataTLBError) | |
ee43eb78 BH |
348 | mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */ |
349 | mtspr SPRN_SPRG_WSCRATCH1, r11 | |
350 | mtspr SPRN_SPRG_WSCRATCH2, r12 | |
351 | mtspr SPRN_SPRG_WSCRATCH3, r13 | |
14cf11af | 352 | mfcr r11 |
ee43eb78 | 353 | mtspr SPRN_SPRG_WSCRATCH4, r11 |
14cf11af PM |
354 | mfspr r10, SPRN_DEAR /* Get faulting address */ |
355 | ||
356 | /* If we are faulting a kernel address, we have to use the | |
357 | * kernel page tables. | |
358 | */ | |
8a13c4f9 | 359 | lis r11, PAGE_OFFSET@h |
14cf11af PM |
360 | cmplw 5, r10, r11 |
361 | blt 5, 3f | |
362 | lis r11, swapper_pg_dir@h | |
363 | ori r11, r11, swapper_pg_dir@l | |
364 | ||
365 | mfspr r12,SPRN_MAS1 /* Set TID to 0 */ | |
366 | rlwinm r12,r12,0,16,1 | |
367 | mtspr SPRN_MAS1,r12 | |
368 | ||
369 | b 4f | |
370 | ||
371 | /* Get the PGD for the current thread */ | |
372 | 3: | |
ee43eb78 | 373 | mfspr r11,SPRN_SPRG_THREAD |
14cf11af PM |
374 | lwz r11,PGDIR(r11) |
375 | ||
376 | 4: | |
6cfd8990 KG |
377 | /* Mask of required permission bits. Note that while we |
378 | * do copy ESR:ST to _PAGE_RW position as trying to write | |
379 | * to an RO page is pretty common, we don't do it with | |
380 | * _PAGE_DIRTY. We could do it, but it's a fairly rare | |
381 | * event so I'd rather take the overhead when it happens | |
382 | * rather than adding an instruction here. We should measure | |
383 | * whether the whole thing is worth it in the first place | |
384 | * as we could avoid loading SPRN_ESR completely in the first | |
385 | * place... | |
386 | * | |
387 | * TODO: Is it worth doing that mfspr & rlwimi in the first | |
388 | * place or can we save a couple of instructions here ? | |
389 | */ | |
390 | mfspr r12,SPRN_ESR | |
76acc2c1 KG |
391 | #ifdef CONFIG_PTE_64BIT |
392 | li r13,_PAGE_PRESENT | |
393 | oris r13,r13,_PAGE_ACCESSED@h | |
394 | #else | |
6cfd8990 | 395 | li r13,_PAGE_PRESENT|_PAGE_ACCESSED |
76acc2c1 | 396 | #endif |
6cfd8990 KG |
397 | rlwimi r13,r12,11,29,29 |
398 | ||
14cf11af | 399 | FIND_PTE |
6cfd8990 | 400 | andc. r13,r13,r11 /* Check permission */ |
14cf11af PM |
401 | |
402 | #ifdef CONFIG_PTE_64BIT | |
b38fd42f KG |
403 | #ifdef CONFIG_SMP |
404 | subf r10,r11,r12 /* create false data dep */ | |
405 | lwzx r13,r11,r10 /* Get upper pte bits */ | |
406 | #else | |
407 | lwz r13,0(r12) /* Get upper pte bits */ | |
408 | #endif | |
14cf11af | 409 | #endif |
14cf11af | 410 | |
b38fd42f KG |
411 | bne 2f /* Bail if permission/valid mismach */ |
412 | ||
413 | /* Jump to common tlb load */ | |
14cf11af PM |
414 | b finish_tlb_load |
415 | 2: | |
416 | /* The bailout. Restore registers to pre-exception conditions | |
417 | * and call the heavyweights to help us out. | |
418 | */ | |
ee43eb78 | 419 | mfspr r11, SPRN_SPRG_RSCRATCH4 |
14cf11af | 420 | mtcr r11 |
ee43eb78 BH |
421 | mfspr r13, SPRN_SPRG_RSCRATCH3 |
422 | mfspr r12, SPRN_SPRG_RSCRATCH2 | |
423 | mfspr r11, SPRN_SPRG_RSCRATCH1 | |
424 | mfspr r10, SPRN_SPRG_RSCRATCH0 | |
6cfd8990 | 425 | b DataStorage |
14cf11af PM |
426 | |
427 | /* Instruction TLB Error Interrupt */ | |
428 | /* | |
429 | * Nearly the same as above, except we get our | |
430 | * information from different registers and bailout | |
431 | * to a different point. | |
432 | */ | |
433 | START_EXCEPTION(InstructionTLBError) | |
ee43eb78 BH |
434 | mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */ |
435 | mtspr SPRN_SPRG_WSCRATCH1, r11 | |
436 | mtspr SPRN_SPRG_WSCRATCH2, r12 | |
437 | mtspr SPRN_SPRG_WSCRATCH3, r13 | |
14cf11af | 438 | mfcr r11 |
ee43eb78 | 439 | mtspr SPRN_SPRG_WSCRATCH4, r11 |
14cf11af PM |
440 | mfspr r10, SPRN_SRR0 /* Get faulting address */ |
441 | ||
442 | /* If we are faulting a kernel address, we have to use the | |
443 | * kernel page tables. | |
444 | */ | |
8a13c4f9 | 445 | lis r11, PAGE_OFFSET@h |
14cf11af PM |
446 | cmplw 5, r10, r11 |
447 | blt 5, 3f | |
448 | lis r11, swapper_pg_dir@h | |
449 | ori r11, r11, swapper_pg_dir@l | |
450 | ||
451 | mfspr r12,SPRN_MAS1 /* Set TID to 0 */ | |
452 | rlwinm r12,r12,0,16,1 | |
453 | mtspr SPRN_MAS1,r12 | |
454 | ||
78e2e68a LY |
455 | /* Make up the required permissions for kernel code */ |
456 | #ifdef CONFIG_PTE_64BIT | |
457 | li r13,_PAGE_PRESENT | _PAGE_BAP_SX | |
458 | oris r13,r13,_PAGE_ACCESSED@h | |
459 | #else | |
460 | li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC | |
461 | #endif | |
14cf11af PM |
462 | b 4f |
463 | ||
464 | /* Get the PGD for the current thread */ | |
465 | 3: | |
ee43eb78 | 466 | mfspr r11,SPRN_SPRG_THREAD |
14cf11af PM |
467 | lwz r11,PGDIR(r11) |
468 | ||
78e2e68a | 469 | /* Make up the required permissions for user code */ |
76acc2c1 | 470 | #ifdef CONFIG_PTE_64BIT |
78e2e68a | 471 | li r13,_PAGE_PRESENT | _PAGE_BAP_UX |
76acc2c1 KG |
472 | oris r13,r13,_PAGE_ACCESSED@h |
473 | #else | |
ea3cc330 | 474 | li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC |
76acc2c1 | 475 | #endif |
6cfd8990 | 476 | |
78e2e68a | 477 | 4: |
14cf11af | 478 | FIND_PTE |
6cfd8990 | 479 | andc. r13,r13,r11 /* Check permission */ |
b38fd42f KG |
480 | |
481 | #ifdef CONFIG_PTE_64BIT | |
482 | #ifdef CONFIG_SMP | |
483 | subf r10,r11,r12 /* create false data dep */ | |
484 | lwzx r13,r11,r10 /* Get upper pte bits */ | |
485 | #else | |
486 | lwz r13,0(r12) /* Get upper pte bits */ | |
487 | #endif | |
488 | #endif | |
489 | ||
6cfd8990 | 490 | bne 2f /* Bail if permission mismach */ |
14cf11af | 491 | |
14cf11af PM |
492 | /* Jump to common TLB load point */ |
493 | b finish_tlb_load | |
494 | ||
495 | 2: | |
496 | /* The bailout. Restore registers to pre-exception conditions | |
497 | * and call the heavyweights to help us out. | |
498 | */ | |
ee43eb78 | 499 | mfspr r11, SPRN_SPRG_RSCRATCH4 |
14cf11af | 500 | mtcr r11 |
ee43eb78 BH |
501 | mfspr r13, SPRN_SPRG_RSCRATCH3 |
502 | mfspr r12, SPRN_SPRG_RSCRATCH2 | |
503 | mfspr r11, SPRN_SPRG_RSCRATCH1 | |
504 | mfspr r10, SPRN_SPRG_RSCRATCH0 | |
14cf11af PM |
505 | b InstructionStorage |
506 | ||
507 | #ifdef CONFIG_SPE | |
508 | /* SPE Unavailable */ | |
509 | START_EXCEPTION(SPEUnavailable) | |
510 | NORMAL_EXCEPTION_PROLOG | |
511 | bne load_up_spe | |
3c5df5c2 | 512 | addi r3,r1,STACK_FRAME_OVERHEAD |
14cf11af PM |
513 | EXC_XFER_EE_LITE(0x2010, KernelSPE) |
514 | #else | |
dc1c1ca3 | 515 | EXCEPTION(0x2020, SPEUnavailable, unknown_exception, EXC_XFER_EE) |
14cf11af PM |
516 | #endif /* CONFIG_SPE */ |
517 | ||
518 | /* SPE Floating Point Data */ | |
519 | #ifdef CONFIG_SPE | |
520 | EXCEPTION(0x2030, SPEFloatingPointData, SPEFloatingPointException, EXC_XFER_EE); | |
14cf11af PM |
521 | |
522 | /* SPE Floating Point Round */ | |
6a800f36 LY |
523 | EXCEPTION(0x2050, SPEFloatingPointRound, SPEFloatingPointRoundException, EXC_XFER_EE) |
524 | #else | |
525 | EXCEPTION(0x2040, SPEFloatingPointData, unknown_exception, EXC_XFER_EE) | |
dc1c1ca3 | 526 | EXCEPTION(0x2050, SPEFloatingPointRound, unknown_exception, EXC_XFER_EE) |
6a800f36 | 527 | #endif /* CONFIG_SPE */ |
14cf11af PM |
528 | |
529 | /* Performance Monitor */ | |
dc1c1ca3 | 530 | EXCEPTION(0x2060, PerformanceMonitor, performance_monitor_exception, EXC_XFER_STD) |
14cf11af | 531 | |
620165f9 KG |
532 | EXCEPTION(0x2070, Doorbell, doorbell_exception, EXC_XFER_STD) |
533 | ||
534 | CRITICAL_EXCEPTION(0x2080, CriticalDoorbell, unknown_exception) | |
14cf11af PM |
535 | |
536 | /* Debug Interrupt */ | |
eb0cd5fd | 537 | DEBUG_DEBUG_EXCEPTION |
eb0cd5fd | 538 | DEBUG_CRIT_EXCEPTION |
14cf11af PM |
539 | |
540 | /* | |
541 | * Local functions | |
542 | */ | |
543 | ||
14cf11af | 544 | /* |
14cf11af PM |
545 | * Both the instruction and data TLB miss get to this |
546 | * point to load the TLB. | |
b38fd42f | 547 | * r10 - available to use |
3c5df5c2 | 548 | * r11 - TLB (info from Linux PTE) |
6cfd8990 KG |
549 | * r12 - available to use |
550 | * r13 - upper bits of PTE (if PTE_64BIT) or available to use | |
8a13c4f9 | 551 | * CR5 - results of addr >= PAGE_OFFSET |
14cf11af PM |
552 | * MAS0, MAS1 - loaded with proper value when we get here |
553 | * MAS2, MAS3 - will need additional info from Linux PTE | |
554 | * Upon exit, we reload everything and RFI. | |
555 | */ | |
556 | finish_tlb_load: | |
557 | /* | |
558 | * We set execute, because we don't have the granularity to | |
559 | * properly set this at the page level (Linux problem). | |
560 | * Many of these bits are software only. Bits we don't set | |
561 | * here we (properly should) assume have the appropriate value. | |
562 | */ | |
563 | ||
564 | mfspr r12, SPRN_MAS2 | |
565 | #ifdef CONFIG_PTE_64BIT | |
76acc2c1 | 566 | rlwimi r12, r11, 32-19, 27, 31 /* extract WIMGE from pte */ |
14cf11af PM |
567 | #else |
568 | rlwimi r12, r11, 26, 27, 31 /* extract WIMGE from pte */ | |
569 | #endif | |
570 | mtspr SPRN_MAS2, r12 | |
571 | ||
76acc2c1 KG |
572 | #ifdef CONFIG_PTE_64BIT |
573 | rlwinm r12, r11, 32-2, 26, 31 /* Move in perm bits */ | |
574 | andi. r10, r11, _PAGE_DIRTY | |
575 | bne 1f | |
576 | li r10, MAS3_SW | MAS3_UW | |
577 | andc r12, r12, r10 | |
578 | 1: rlwimi r12, r13, 20, 0, 11 /* grab RPN[32:43] */ | |
579 | rlwimi r12, r11, 20, 12, 19 /* grab RPN[44:51] */ | |
580 | mtspr SPRN_MAS3, r12 | |
581 | BEGIN_MMU_FTR_SECTION | |
582 | srwi r10, r13, 12 /* grab RPN[12:31] */ | |
583 | mtspr SPRN_MAS7, r10 | |
584 | END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS) | |
585 | #else | |
ea3cc330 | 586 | li r10, (_PAGE_EXEC | _PAGE_PRESENT) |
6cfd8990 KG |
587 | rlwimi r10, r11, 31, 29, 29 /* extract _PAGE_DIRTY into SW */ |
588 | and r12, r11, r10 | |
14cf11af | 589 | andi. r10, r11, _PAGE_USER /* Test for _PAGE_USER */ |
6cfd8990 KG |
590 | slwi r10, r12, 1 |
591 | or r10, r10, r12 | |
592 | iseleq r12, r12, r10 | |
06b90969 | 593 | rlwimi r11, r12, 0, 20, 31 /* Extract RPN from PTE and merge with perms */ |
14cf11af PM |
594 | mtspr SPRN_MAS3, r11 |
595 | #endif | |
596 | #ifdef CONFIG_E200 | |
597 | /* Round robin TLB1 entries assignment */ | |
598 | mfspr r12, SPRN_MAS0 | |
599 | ||
600 | /* Extract TLB1CFG(NENTRY) */ | |
601 | mfspr r11, SPRN_TLB1CFG | |
602 | andi. r11, r11, 0xfff | |
603 | ||
604 | /* Extract MAS0(NV) */ | |
605 | andi. r13, r12, 0xfff | |
606 | addi r13, r13, 1 | |
607 | cmpw 0, r13, r11 | |
608 | addi r12, r12, 1 | |
609 | ||
610 | /* check if we need to wrap */ | |
611 | blt 7f | |
612 | ||
613 | /* wrap back to first free tlbcam entry */ | |
614 | lis r13, tlbcam_index@ha | |
615 | lwz r13, tlbcam_index@l(r13) | |
616 | rlwimi r12, r13, 0, 20, 31 | |
617 | 7: | |
3c5df5c2 | 618 | mtspr SPRN_MAS0,r12 |
14cf11af PM |
619 | #endif /* CONFIG_E200 */ |
620 | ||
621 | tlbwe | |
622 | ||
623 | /* Done...restore registers and get out of here. */ | |
ee43eb78 | 624 | mfspr r11, SPRN_SPRG_RSCRATCH4 |
14cf11af | 625 | mtcr r11 |
ee43eb78 BH |
626 | mfspr r13, SPRN_SPRG_RSCRATCH3 |
627 | mfspr r12, SPRN_SPRG_RSCRATCH2 | |
628 | mfspr r11, SPRN_SPRG_RSCRATCH1 | |
629 | mfspr r10, SPRN_SPRG_RSCRATCH0 | |
14cf11af PM |
630 | rfi /* Force context change */ |
631 | ||
632 | #ifdef CONFIG_SPE | |
633 | /* Note that the SPE support is closely modeled after the AltiVec | |
634 | * support. Changes to one are likely to be applicable to the | |
635 | * other! */ | |
636 | load_up_spe: | |
637 | /* | |
638 | * Disable SPE for the task which had SPE previously, | |
639 | * and save its SPE registers in its thread_struct. | |
640 | * Enables SPE for use in the kernel on return. | |
641 | * On SMP we know the SPE units are free, since we give it up every | |
642 | * switch. -- Kumar | |
643 | */ | |
644 | mfmsr r5 | |
645 | oris r5,r5,MSR_SPE@h | |
646 | mtmsr r5 /* enable use of SPE now */ | |
647 | isync | |
648 | /* | |
649 | * For SMP, we don't do lazy SPE switching because it just gets too | |
650 | * horrendously complex, especially when a task switches from one CPU | |
651 | * to another. Instead we call giveup_spe in switch_to. | |
652 | */ | |
653 | #ifndef CONFIG_SMP | |
654 | lis r3,last_task_used_spe@ha | |
655 | lwz r4,last_task_used_spe@l(r3) | |
656 | cmpi 0,r4,0 | |
657 | beq 1f | |
658 | addi r4,r4,THREAD /* want THREAD of last_task_used_spe */ | |
659 | SAVE_32EVRS(0,r10,r4) | |
3c5df5c2 | 660 | evxor evr10, evr10, evr10 /* clear out evr10 */ |
14cf11af PM |
661 | evmwumiaa evr10, evr10, evr10 /* evr10 <- ACC = 0 * 0 + ACC */ |
662 | li r5,THREAD_ACC | |
3c5df5c2 | 663 | evstddx evr10, r4, r5 /* save off accumulator */ |
14cf11af PM |
664 | lwz r5,PT_REGS(r4) |
665 | lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5) | |
666 | lis r10,MSR_SPE@h | |
667 | andc r4,r4,r10 /* disable SPE for previous task */ | |
668 | stw r4,_MSR-STACK_FRAME_OVERHEAD(r5) | |
669 | 1: | |
3c5df5c2 | 670 | #endif /* !CONFIG_SMP */ |
14cf11af PM |
671 | /* enable use of SPE after return */ |
672 | oris r9,r9,MSR_SPE@h | |
ee43eb78 | 673 | mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */ |
14cf11af PM |
674 | li r4,1 |
675 | li r10,THREAD_ACC | |
676 | stw r4,THREAD_USED_SPE(r5) | |
677 | evlddx evr4,r10,r5 | |
678 | evmra evr4,evr4 | |
679 | REST_32EVRS(0,r10,r5) | |
680 | #ifndef CONFIG_SMP | |
681 | subi r4,r5,THREAD | |
682 | stw r4,last_task_used_spe@l(r3) | |
3c5df5c2 | 683 | #endif /* !CONFIG_SMP */ |
14cf11af PM |
684 | /* restore registers and return */ |
685 | 2: REST_4GPRS(3, r11) | |
686 | lwz r10,_CCR(r11) | |
687 | REST_GPR(1, r11) | |
688 | mtcr r10 | |
689 | lwz r10,_LINK(r11) | |
690 | mtlr r10 | |
691 | REST_GPR(10, r11) | |
692 | mtspr SPRN_SRR1,r9 | |
693 | mtspr SPRN_SRR0,r12 | |
694 | REST_GPR(9, r11) | |
695 | REST_GPR(12, r11) | |
696 | lwz r11,GPR11(r11) | |
14cf11af PM |
697 | rfi |
698 | ||
699 | /* | |
700 | * SPE unavailable trap from kernel - print a message, but let | |
701 | * the task use SPE in the kernel until it returns to user mode. | |
702 | */ | |
703 | KernelSPE: | |
704 | lwz r3,_MSR(r1) | |
705 | oris r3,r3,MSR_SPE@h | |
706 | stw r3,_MSR(r1) /* enable use of SPE after return */ | |
09156a7a | 707 | #ifdef CONFIG_PRINTK |
14cf11af PM |
708 | lis r3,87f@h |
709 | ori r3,r3,87f@l | |
710 | mr r4,r2 /* current */ | |
711 | lwz r5,_NIP(r1) | |
712 | bl printk | |
09156a7a | 713 | #endif |
14cf11af | 714 | b ret_from_except |
09156a7a | 715 | #ifdef CONFIG_PRINTK |
14cf11af | 716 | 87: .string "SPE used in kernel (task=%p, pc=%x) \n" |
09156a7a | 717 | #endif |
14cf11af PM |
718 | .align 4,0 |
719 | ||
720 | #endif /* CONFIG_SPE */ | |
721 | ||
722 | /* | |
723 | * Global functions | |
724 | */ | |
725 | ||
105c31df KG |
726 | /* Adjust or setup IVORs for e200 */ |
727 | _GLOBAL(__setup_e200_ivors) | |
728 | li r3,DebugDebug@l | |
729 | mtspr SPRN_IVOR15,r3 | |
730 | li r3,SPEUnavailable@l | |
731 | mtspr SPRN_IVOR32,r3 | |
732 | li r3,SPEFloatingPointData@l | |
733 | mtspr SPRN_IVOR33,r3 | |
734 | li r3,SPEFloatingPointRound@l | |
735 | mtspr SPRN_IVOR34,r3 | |
736 | sync | |
737 | blr | |
738 | ||
739 | /* Adjust or setup IVORs for e500v1/v2 */ | |
740 | _GLOBAL(__setup_e500_ivors) | |
741 | li r3,DebugCrit@l | |
742 | mtspr SPRN_IVOR15,r3 | |
743 | li r3,SPEUnavailable@l | |
744 | mtspr SPRN_IVOR32,r3 | |
745 | li r3,SPEFloatingPointData@l | |
746 | mtspr SPRN_IVOR33,r3 | |
747 | li r3,SPEFloatingPointRound@l | |
748 | mtspr SPRN_IVOR34,r3 | |
749 | li r3,PerformanceMonitor@l | |
750 | mtspr SPRN_IVOR35,r3 | |
751 | sync | |
752 | blr | |
753 | ||
754 | /* Adjust or setup IVORs for e500mc */ | |
755 | _GLOBAL(__setup_e500mc_ivors) | |
756 | li r3,DebugDebug@l | |
757 | mtspr SPRN_IVOR15,r3 | |
758 | li r3,PerformanceMonitor@l | |
759 | mtspr SPRN_IVOR35,r3 | |
760 | li r3,Doorbell@l | |
761 | mtspr SPRN_IVOR36,r3 | |
620165f9 KG |
762 | li r3,CriticalDoorbell@l |
763 | mtspr SPRN_IVOR37,r3 | |
105c31df KG |
764 | sync |
765 | blr | |
766 | ||
14cf11af PM |
767 | /* |
768 | * extern void giveup_altivec(struct task_struct *prev) | |
769 | * | |
770 | * The e500 core does not have an AltiVec unit. | |
771 | */ | |
772 | _GLOBAL(giveup_altivec) | |
773 | blr | |
774 | ||
775 | #ifdef CONFIG_SPE | |
776 | /* | |
777 | * extern void giveup_spe(struct task_struct *prev) | |
778 | * | |
779 | */ | |
780 | _GLOBAL(giveup_spe) | |
781 | mfmsr r5 | |
782 | oris r5,r5,MSR_SPE@h | |
14cf11af PM |
783 | mtmsr r5 /* enable use of SPE now */ |
784 | isync | |
785 | cmpi 0,r3,0 | |
786 | beqlr- /* if no previous owner, done */ | |
787 | addi r3,r3,THREAD /* want THREAD of task */ | |
788 | lwz r5,PT_REGS(r3) | |
789 | cmpi 0,r5,0 | |
790 | SAVE_32EVRS(0, r4, r3) | |
3c5df5c2 | 791 | evxor evr6, evr6, evr6 /* clear out evr6 */ |
14cf11af PM |
792 | evmwumiaa evr6, evr6, evr6 /* evr6 <- ACC = 0 * 0 + ACC */ |
793 | li r4,THREAD_ACC | |
3c5df5c2 | 794 | evstddx evr6, r4, r3 /* save off accumulator */ |
14cf11af PM |
795 | mfspr r6,SPRN_SPEFSCR |
796 | stw r6,THREAD_SPEFSCR(r3) /* save spefscr register value */ | |
797 | beq 1f | |
798 | lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5) | |
799 | lis r3,MSR_SPE@h | |
800 | andc r4,r4,r3 /* disable SPE for previous task */ | |
801 | stw r4,_MSR-STACK_FRAME_OVERHEAD(r5) | |
802 | 1: | |
803 | #ifndef CONFIG_SMP | |
804 | li r5,0 | |
805 | lis r4,last_task_used_spe@ha | |
806 | stw r5,last_task_used_spe@l(r4) | |
3c5df5c2 | 807 | #endif /* !CONFIG_SMP */ |
14cf11af PM |
808 | blr |
809 | #endif /* CONFIG_SPE */ | |
810 | ||
811 | /* | |
812 | * extern void giveup_fpu(struct task_struct *prev) | |
813 | * | |
814 | * Not all FSL Book-E cores have an FPU | |
815 | */ | |
816 | #ifndef CONFIG_PPC_FPU | |
817 | _GLOBAL(giveup_fpu) | |
818 | blr | |
819 | #endif | |
820 | ||
821 | /* | |
822 | * extern void abort(void) | |
823 | * | |
824 | * At present, this routine just applies a system reset. | |
825 | */ | |
826 | _GLOBAL(abort) | |
827 | li r13,0 | |
3c5df5c2 | 828 | mtspr SPRN_DBCR0,r13 /* disable all debug events */ |
a7cb0337 | 829 | isync |
14cf11af PM |
830 | mfmsr r13 |
831 | ori r13,r13,MSR_DE@l /* Enable Debug Events */ | |
832 | mtmsr r13 | |
a7cb0337 | 833 | isync |
3c5df5c2 KG |
834 | mfspr r13,SPRN_DBCR0 |
835 | lis r13,(DBCR0_IDM|DBCR0_RST_CHIP)@h | |
836 | mtspr SPRN_DBCR0,r13 | |
a7cb0337 | 837 | isync |
14cf11af PM |
838 | |
839 | _GLOBAL(set_context) | |
840 | ||
841 | #ifdef CONFIG_BDI_SWITCH | |
842 | /* Context switch the PTE pointer for the Abatron BDI2000. | |
843 | * The PGDIR is the second parameter. | |
844 | */ | |
845 | lis r5, abatron_pteptrs@h | |
846 | ori r5, r5, abatron_pteptrs@l | |
847 | stw r4, 0x4(r5) | |
848 | #endif | |
849 | mtspr SPRN_PID,r3 | |
850 | isync /* Force context change */ | |
851 | blr | |
852 | ||
fc4033b2 KG |
853 | _GLOBAL(flush_dcache_L1) |
854 | mfspr r3,SPRN_L1CFG0 | |
855 | ||
856 | rlwinm r5,r3,9,3 /* Extract cache block size */ | |
857 | twlgti r5,1 /* Only 32 and 64 byte cache blocks | |
858 | * are currently defined. | |
859 | */ | |
860 | li r4,32 | |
861 | subfic r6,r5,2 /* r6 = log2(1KiB / cache block size) - | |
862 | * log2(number of ways) | |
863 | */ | |
864 | slw r5,r4,r5 /* r5 = cache block size */ | |
865 | ||
866 | rlwinm r7,r3,0,0xff /* Extract number of KiB in the cache */ | |
867 | mulli r7,r7,13 /* An 8-way cache will require 13 | |
868 | * loads per set. | |
869 | */ | |
870 | slw r7,r7,r6 | |
871 | ||
872 | /* save off HID0 and set DCFA */ | |
873 | mfspr r8,SPRN_HID0 | |
874 | ori r9,r8,HID0_DCFA@l | |
875 | mtspr SPRN_HID0,r9 | |
876 | isync | |
877 | ||
878 | lis r4,KERNELBASE@h | |
879 | mtctr r7 | |
880 | ||
881 | 1: lwz r3,0(r4) /* Load... */ | |
882 | add r4,r4,r5 | |
883 | bdnz 1b | |
884 | ||
885 | msync | |
886 | lis r4,KERNELBASE@h | |
887 | mtctr r7 | |
888 | ||
889 | 1: dcbf 0,r4 /* ...and flush. */ | |
890 | add r4,r4,r5 | |
891 | bdnz 1b | |
892 | ||
893 | /* restore HID0 */ | |
894 | mtspr SPRN_HID0,r8 | |
895 | isync | |
896 | ||
897 | blr | |
898 | ||
d5b26db2 KG |
899 | #ifdef CONFIG_SMP |
900 | /* When we get here, r24 needs to hold the CPU # */ | |
901 | .globl __secondary_start | |
902 | __secondary_start: | |
903 | lis r3,__secondary_hold_acknowledge@h | |
904 | ori r3,r3,__secondary_hold_acknowledge@l | |
905 | stw r24,0(r3) | |
906 | ||
907 | li r3,0 | |
908 | mr r4,r24 /* Why? */ | |
909 | bl call_setup_cpu | |
910 | ||
911 | lis r3,tlbcam_index@ha | |
912 | lwz r3,tlbcam_index@l(r3) | |
913 | mtctr r3 | |
914 | li r26,0 /* r26 safe? */ | |
915 | ||
916 | /* Load each CAM entry */ | |
917 | 1: mr r3,r26 | |
918 | bl loadcam_entry | |
919 | addi r26,r26,1 | |
920 | bdnz 1b | |
921 | ||
922 | /* get current_thread_info and current */ | |
923 | lis r1,secondary_ti@ha | |
924 | lwz r1,secondary_ti@l(r1) | |
925 | lwz r2,TI_TASK(r1) | |
926 | ||
927 | /* stack */ | |
928 | addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD | |
929 | li r0,0 | |
930 | stw r0,0(r1) | |
931 | ||
932 | /* ptr to current thread */ | |
933 | addi r4,r2,THREAD /* address of our thread_struct */ | |
ee43eb78 | 934 | mtspr SPRN_SPRG_THREAD,r4 |
d5b26db2 KG |
935 | |
936 | /* Setup the defaults for TLB entries */ | |
d66c82ea | 937 | li r4,(MAS4_TSIZED(BOOK3E_PAGESZ_4K))@l |
d5b26db2 KG |
938 | mtspr SPRN_MAS4,r4 |
939 | ||
940 | /* Jump to start_secondary */ | |
941 | lis r4,MSR_KERNEL@h | |
942 | ori r4,r4,MSR_KERNEL@l | |
943 | lis r3,start_secondary@h | |
944 | ori r3,r3,start_secondary@l | |
945 | mtspr SPRN_SRR0,r3 | |
946 | mtspr SPRN_SRR1,r4 | |
947 | sync | |
948 | rfi | |
949 | sync | |
950 | ||
951 | .globl __secondary_hold_acknowledge | |
952 | __secondary_hold_acknowledge: | |
953 | .long -1 | |
954 | #endif | |
955 | ||
14cf11af PM |
956 | /* |
957 | * We put a few things here that have to be page-aligned. This stuff | |
958 | * goes at the beginning of the data segment, which is page-aligned. | |
959 | */ | |
960 | .data | |
ea703ce2 KG |
961 | .align 12 |
962 | .globl sdata | |
963 | sdata: | |
964 | .globl empty_zero_page | |
965 | empty_zero_page: | |
14cf11af | 966 | .space 4096 |
ea703ce2 KG |
967 | .globl swapper_pg_dir |
968 | swapper_pg_dir: | |
bee86f14 | 969 | .space PGD_TABLE_SIZE |
14cf11af | 970 | |
14cf11af PM |
971 | /* |
972 | * Room for two PTE pointers, usually the kernel and current user pointers | |
973 | * to their respective root page table. | |
974 | */ | |
975 | abatron_pteptrs: | |
976 | .space 8 |