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