Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/head.S | |
3 | * | |
4 | * Copyright (C) 1994-2002 Russell King | |
e65f38ed RK |
5 | * Copyright (c) 2003 ARM Limited |
6 | * All Rights Reserved | |
1da177e4 LT |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * Kernel startup code for all 32-bit CPUs | |
13 | */ | |
1da177e4 LT |
14 | #include <linux/linkage.h> |
15 | #include <linux/init.h> | |
16 | ||
17 | #include <asm/assembler.h> | |
195864cf | 18 | #include <asm/cp15.h> |
1da177e4 | 19 | #include <asm/domain.h> |
1da177e4 | 20 | #include <asm/ptrace.h> |
e6ae744d | 21 | #include <asm/asm-offsets.h> |
f09b9979 | 22 | #include <asm/memory.h> |
4f7a1812 | 23 | #include <asm/thread_info.h> |
e73fc88e | 24 | #include <asm/pgtable.h> |
1da177e4 | 25 | |
91a9fec0 RH |
26 | #if defined(CONFIG_DEBUG_LL) && !defined(CONFIG_DEBUG_SEMIHOSTING) |
27 | #include CONFIG_DEBUG_LL_INCLUDE | |
c293393f JK |
28 | #endif |
29 | ||
1da177e4 | 30 | /* |
37d07b72 | 31 | * swapper_pg_dir is the virtual address of the initial page table. |
f06b97ff RK |
32 | * We place the page tables 16K below KERNEL_RAM_VADDR. Therefore, we must |
33 | * make sure that KERNEL_RAM_VADDR is correctly set. Currently, we expect | |
37d07b72 | 34 | * the least significant 16 bits to be 0x8000, but we could probably |
f06b97ff | 35 | * relax this restriction to KERNEL_RAM_VADDR >= PAGE_OFFSET + 0x4000. |
1da177e4 | 36 | */ |
72a20e22 | 37 | #define KERNEL_RAM_VADDR (PAGE_OFFSET + TEXT_OFFSET) |
f06b97ff RK |
38 | #if (KERNEL_RAM_VADDR & 0xffff) != 0x8000 |
39 | #error KERNEL_RAM_VADDR must start at 0xXXXX8000 | |
1da177e4 LT |
40 | #endif |
41 | ||
1b6ba46b CM |
42 | #ifdef CONFIG_ARM_LPAE |
43 | /* LPAE requires an additional page for the PGD */ | |
44 | #define PG_DIR_SIZE 0x5000 | |
45 | #define PMD_ORDER 3 | |
46 | #else | |
e73fc88e CM |
47 | #define PG_DIR_SIZE 0x4000 |
48 | #define PMD_ORDER 2 | |
1b6ba46b | 49 | #endif |
e73fc88e | 50 | |
1da177e4 | 51 | .globl swapper_pg_dir |
e73fc88e | 52 | .equ swapper_pg_dir, KERNEL_RAM_VADDR - PG_DIR_SIZE |
1da177e4 | 53 | |
72a20e22 | 54 | .macro pgtbl, rd, phys |
2ab4e8c0 CC |
55 | add \rd, \phys, #TEXT_OFFSET |
56 | sub \rd, \rd, #PG_DIR_SIZE | |
1da177e4 | 57 | .endm |
1da177e4 | 58 | |
1da177e4 LT |
59 | /* |
60 | * Kernel startup entry point. | |
61 | * --------------------------- | |
62 | * | |
63 | * This is normally called from the decompressor code. The requirements | |
64 | * are: MMU = off, D-cache = off, I-cache = dont care, r0 = 0, | |
4c2896e8 | 65 | * r1 = machine nr, r2 = atags or dtb pointer. |
1da177e4 LT |
66 | * |
67 | * This code is mostly position independent, so if you link the kernel at | |
68 | * 0xc0008000, you call this at __pa(0xc0008000). | |
69 | * | |
70 | * See linux/arch/arm/tools/mach-types for the complete list of machine | |
71 | * numbers for r1. | |
72 | * | |
73 | * We're trying to keep crap to a minimum; DO NOT add any machine specific | |
74 | * crap here - that's what the boot loader (or in extreme, well justified | |
75 | * circumstances, zImage) is for. | |
76 | */ | |
540b5738 DM |
77 | .arm |
78 | ||
2abc1c50 | 79 | __HEAD |
1da177e4 | 80 | ENTRY(stext) |
97bcb0fe | 81 | ARM_BE8(setend be ) @ ensure we are in BE8 mode |
540b5738 DM |
82 | |
83 | THUMB( adr r9, BSYM(1f) ) @ Kernel is always entered in ARM. | |
84 | THUMB( bx r9 ) @ If this is a Thumb-2 kernel, | |
85 | THUMB( .thumb ) @ switch to Thumb now. | |
86 | THUMB(1: ) | |
87 | ||
80c59daf DM |
88 | #ifdef CONFIG_ARM_VIRT_EXT |
89 | bl __hyp_stub_install | |
90 | #endif | |
91 | @ ensure svc mode and all interrupts masked | |
92 | safe_svcmode_maskall r9 | |
93 | ||
0f44ba1d | 94 | mrc p15, 0, r9, c0, c0 @ get processor id |
1da177e4 LT |
95 | bl __lookup_processor_type @ r5=procinfo r9=cpuid |
96 | movs r10, r5 @ invalid processor (r5=0)? | |
a75e5248 | 97 | THUMB( it eq ) @ force fixup-able long branch encoding |
3c0bdac3 | 98 | beq __error_p @ yes, error 'p' |
0eb0511d | 99 | |
294064f5 CM |
100 | #ifdef CONFIG_ARM_LPAE |
101 | mrc p15, 0, r3, c0, c1, 4 @ read ID_MMFR0 | |
102 | and r3, r3, #0xf @ extract VMSA support | |
103 | cmp r3, #5 @ long-descriptor translation table format? | |
104 | THUMB( it lo ) @ force fixup-able long branch encoding | |
b3634575 | 105 | blo __error_lpae @ only classic page table format |
294064f5 CM |
106 | #endif |
107 | ||
72a20e22 RK |
108 | #ifndef CONFIG_XIP_KERNEL |
109 | adr r3, 2f | |
110 | ldmia r3, {r4, r8} | |
111 | sub r4, r3, r4 @ (PHYS_OFFSET - PAGE_OFFSET) | |
112 | add r8, r8, r4 @ PHYS_OFFSET | |
113 | #else | |
b713aa0b | 114 | ldr r8, =PLAT_PHYS_OFFSET @ always constant in this case |
72a20e22 RK |
115 | #endif |
116 | ||
0eb0511d | 117 | /* |
4c2896e8 | 118 | * r1 = machine no, r2 = atags or dtb, |
72a20e22 | 119 | * r8 = phys_offset, r9 = cpuid, r10 = procinfo |
0eb0511d | 120 | */ |
9d20fdd5 | 121 | bl __vet_atags |
f00ec48f RK |
122 | #ifdef CONFIG_SMP_ON_UP |
123 | bl __fixup_smp | |
dc21af99 RK |
124 | #endif |
125 | #ifdef CONFIG_ARM_PATCH_PHYS_VIRT | |
126 | bl __fixup_pv_table | |
f00ec48f | 127 | #endif |
1da177e4 LT |
128 | bl __create_page_tables |
129 | ||
130 | /* | |
131 | * The following calls CPU specific code in a position independent | |
132 | * manner. See arch/arm/mm/proc-*.S for details. r10 = base of | |
6fc31d54 | 133 | * xxx_proc_info structure selected by __lookup_processor_type |
1da177e4 LT |
134 | * above. On return, the CPU will be ready for the MMU to be |
135 | * turned on, and r0 will hold the CPU control register value. | |
136 | */ | |
a4ae4134 | 137 | ldr r13, =__mmap_switched @ address to jump to after |
1da177e4 | 138 | @ mmu has been enabled |
00945010 | 139 | adr lr, BSYM(1f) @ return (PIC) address |
d427958a | 140 | mov r8, r4 @ set TTBR1 to swapper_pg_dir |
bf35706f AB |
141 | ldr r12, [r10, #PROCINFO_INITFUNC] |
142 | add r12, r12, r10 | |
143 | ret r12 | |
00945010 | 144 | 1: b __enable_mmu |
93ed3970 | 145 | ENDPROC(stext) |
a4ae4134 | 146 | .ltorg |
72a20e22 RK |
147 | #ifndef CONFIG_XIP_KERNEL |
148 | 2: .long . | |
149 | .long PAGE_OFFSET | |
150 | #endif | |
1da177e4 LT |
151 | |
152 | /* | |
153 | * Setup the initial page tables. We only setup the barest | |
154 | * amount which are required to get the kernel running, which | |
155 | * generally means mapping in the kernel code. | |
156 | * | |
72a20e22 | 157 | * r8 = phys_offset, r9 = cpuid, r10 = procinfo |
1da177e4 LT |
158 | * |
159 | * Returns: | |
786f1b73 | 160 | * r0, r3, r5-r7 corrupted |
4756dcbf | 161 | * r4 = page table (see ARCH_PGD_SHIFT in asm/memory.h) |
1da177e4 | 162 | */ |
1da177e4 | 163 | __create_page_tables: |
72a20e22 | 164 | pgtbl r4, r8 @ page table address |
1da177e4 LT |
165 | |
166 | /* | |
e73fc88e | 167 | * Clear the swapper page table |
1da177e4 LT |
168 | */ |
169 | mov r0, r4 | |
170 | mov r3, #0 | |
e73fc88e | 171 | add r6, r0, #PG_DIR_SIZE |
1da177e4 LT |
172 | 1: str r3, [r0], #4 |
173 | str r3, [r0], #4 | |
174 | str r3, [r0], #4 | |
175 | str r3, [r0], #4 | |
176 | teq r0, r6 | |
177 | bne 1b | |
178 | ||
1b6ba46b CM |
179 | #ifdef CONFIG_ARM_LPAE |
180 | /* | |
181 | * Build the PGD table (first level) to point to the PMD table. A PGD | |
182 | * entry is 64-bit wide. | |
183 | */ | |
184 | mov r0, r4 | |
185 | add r3, r4, #0x1000 @ first PMD table address | |
186 | orr r3, r3, #3 @ PGD block type | |
187 | mov r6, #4 @ PTRS_PER_PGD | |
188 | mov r7, #1 << (55 - 32) @ L_PGD_SWAPPER | |
d61947a1 WD |
189 | 1: |
190 | #ifdef CONFIG_CPU_ENDIAN_BE8 | |
1b6ba46b | 191 | str r7, [r0], #4 @ set top PGD entry bits |
d61947a1 WD |
192 | str r3, [r0], #4 @ set bottom PGD entry bits |
193 | #else | |
194 | str r3, [r0], #4 @ set bottom PGD entry bits | |
195 | str r7, [r0], #4 @ set top PGD entry bits | |
196 | #endif | |
1b6ba46b CM |
197 | add r3, r3, #0x1000 @ next PMD table |
198 | subs r6, r6, #1 | |
199 | bne 1b | |
200 | ||
201 | add r4, r4, #0x1000 @ point to the PMD tables | |
d61947a1 WD |
202 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
203 | add r4, r4, #4 @ we only write the bottom word | |
204 | #endif | |
1b6ba46b CM |
205 | #endif |
206 | ||
8799ee9f | 207 | ldr r7, [r10, #PROCINFO_MM_MMUFLAGS] @ mm_mmuflags |
1da177e4 LT |
208 | |
209 | /* | |
786f1b73 RK |
210 | * Create identity mapping to cater for __enable_mmu. |
211 | * This identity mapping will be removed by paging_init(). | |
1da177e4 | 212 | */ |
72662e01 | 213 | adr r0, __turn_mmu_on_loc |
786f1b73 RK |
214 | ldmia r0, {r3, r5, r6} |
215 | sub r0, r0, r3 @ virt->phys offset | |
72662e01 WD |
216 | add r5, r5, r0 @ phys __turn_mmu_on |
217 | add r6, r6, r0 @ phys __turn_mmu_on_end | |
e73fc88e CM |
218 | mov r5, r5, lsr #SECTION_SHIFT |
219 | mov r6, r6, lsr #SECTION_SHIFT | |
786f1b73 | 220 | |
e73fc88e CM |
221 | 1: orr r3, r7, r5, lsl #SECTION_SHIFT @ flags + kernel base |
222 | str r3, [r4, r5, lsl #PMD_ORDER] @ identity mapping | |
223 | cmp r5, r6 | |
224 | addlo r5, r5, #1 @ next section | |
225 | blo 1b | |
1da177e4 LT |
226 | |
227 | /* | |
9fa16b77 | 228 | * Map our RAM from the start to the end of the kernel .bss section. |
1da177e4 | 229 | */ |
9fa16b77 NP |
230 | add r0, r4, #PAGE_OFFSET >> (SECTION_SHIFT - PMD_ORDER) |
231 | ldr r6, =(_end - 1) | |
232 | orr r3, r8, r7 | |
e73fc88e | 233 | add r6, r4, r6, lsr #(SECTION_SHIFT - PMD_ORDER) |
9fa16b77 | 234 | 1: str r3, [r0], #1 << PMD_ORDER |
e73fc88e | 235 | add r3, r3, #1 << SECTION_SHIFT |
9fa16b77 | 236 | cmp r0, r6 |
e98ff7f6 | 237 | bls 1b |
1da177e4 | 238 | |
ec3622d9 NP |
239 | #ifdef CONFIG_XIP_KERNEL |
240 | /* | |
9fa16b77 | 241 | * Map the kernel image separately as it is not located in RAM. |
ec3622d9 | 242 | */ |
9fa16b77 NP |
243 | #define XIP_START XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) |
244 | mov r3, pc | |
245 | mov r3, r3, lsr #SECTION_SHIFT | |
246 | orr r3, r7, r3, lsl #SECTION_SHIFT | |
247 | add r0, r4, #(XIP_START & 0xff000000) >> (SECTION_SHIFT - PMD_ORDER) | |
248 | str r3, [r0, #((XIP_START & 0x00f00000) >> SECTION_SHIFT) << PMD_ORDER]! | |
249 | ldr r6, =(_edata_loc - 1) | |
250 | add r0, r0, #1 << PMD_ORDER | |
e73fc88e | 251 | add r6, r4, r6, lsr #(SECTION_SHIFT - PMD_ORDER) |
ec3622d9 | 252 | 1: cmp r0, r6 |
9fa16b77 NP |
253 | add r3, r3, #1 << SECTION_SHIFT |
254 | strls r3, [r0], #1 << PMD_ORDER | |
ec3622d9 NP |
255 | bls 1b |
256 | #endif | |
257 | ||
1da177e4 | 258 | /* |
9fa16b77 | 259 | * Then map boot params address in r2 if specified. |
6f16f499 | 260 | * We map 2 sections in case the ATAGs/DTB crosses a section boundary. |
1da177e4 | 261 | */ |
e73fc88e CM |
262 | mov r0, r2, lsr #SECTION_SHIFT |
263 | movs r0, r0, lsl #SECTION_SHIFT | |
9fa16b77 NP |
264 | subne r3, r0, r8 |
265 | addne r3, r3, #PAGE_OFFSET | |
266 | addne r3, r4, r3, lsr #(SECTION_SHIFT - PMD_ORDER) | |
267 | orrne r6, r7, r0 | |
6f16f499 NP |
268 | strne r6, [r3], #1 << PMD_ORDER |
269 | addne r6, r6, #1 << SECTION_SHIFT | |
9fa16b77 | 270 | strne r6, [r3] |
1da177e4 | 271 | |
4e1db26a | 272 | #if defined(CONFIG_ARM_LPAE) && defined(CONFIG_CPU_ENDIAN_BE8) |
d61947a1 WD |
273 | sub r4, r4, #4 @ Fixup page table pointer |
274 | @ for 64-bit descriptors | |
275 | #endif | |
276 | ||
c77b0427 | 277 | #ifdef CONFIG_DEBUG_LL |
9b5a146a | 278 | #if !defined(CONFIG_DEBUG_ICEDCC) && !defined(CONFIG_DEBUG_SEMIHOSTING) |
1da177e4 LT |
279 | /* |
280 | * Map in IO space for serial debugging. | |
281 | * This allows debug messages to be output | |
282 | * via a serial console before paging_init. | |
283 | */ | |
639da5ee | 284 | addruart r7, r3, r0 |
c293393f | 285 | |
e73fc88e CM |
286 | mov r3, r3, lsr #SECTION_SHIFT |
287 | mov r3, r3, lsl #PMD_ORDER | |
c293393f | 288 | |
1da177e4 | 289 | add r0, r4, r3 |
e73fc88e | 290 | mov r3, r7, lsr #SECTION_SHIFT |
c293393f | 291 | ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags |
e73fc88e | 292 | orr r3, r7, r3, lsl #SECTION_SHIFT |
1b6ba46b CM |
293 | #ifdef CONFIG_ARM_LPAE |
294 | mov r7, #1 << (54 - 32) @ XN | |
d61947a1 WD |
295 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
296 | str r7, [r0], #4 | |
297 | str r3, [r0], #4 | |
1b6ba46b | 298 | #else |
f67860a7 | 299 | str r3, [r0], #4 |
1b6ba46b CM |
300 | str r7, [r0], #4 |
301 | #endif | |
d61947a1 WD |
302 | #else |
303 | orr r3, r3, #PMD_SECT_XN | |
304 | str r3, [r0], #4 | |
305 | #endif | |
c293393f | 306 | |
9b5a146a NP |
307 | #else /* CONFIG_DEBUG_ICEDCC || CONFIG_DEBUG_SEMIHOSTING */ |
308 | /* we don't need any serial debugging mappings */ | |
c293393f | 309 | ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags |
9b5a146a | 310 | #endif |
c293393f | 311 | |
1da177e4 LT |
312 | #if defined(CONFIG_ARCH_NETWINDER) || defined(CONFIG_ARCH_CATS) |
313 | /* | |
3c0bdac3 RK |
314 | * If we're using the NetWinder or CATS, we also need to map |
315 | * in the 16550-type serial port for the debug messages | |
1da177e4 | 316 | */ |
e73fc88e | 317 | add r0, r4, #0xff000000 >> (SECTION_SHIFT - PMD_ORDER) |
c77b0427 RK |
318 | orr r3, r7, #0x7c000000 |
319 | str r3, [r0] | |
1da177e4 | 320 | #endif |
1da177e4 LT |
321 | #ifdef CONFIG_ARCH_RPC |
322 | /* | |
323 | * Map in screen at 0x02000000 & SCREEN2_BASE | |
324 | * Similar reasons here - for debug. This is | |
325 | * only for Acorn RiscPC architectures. | |
326 | */ | |
e73fc88e | 327 | add r0, r4, #0x02000000 >> (SECTION_SHIFT - PMD_ORDER) |
c77b0427 | 328 | orr r3, r7, #0x02000000 |
1da177e4 | 329 | str r3, [r0] |
e73fc88e | 330 | add r0, r4, #0xd8000000 >> (SECTION_SHIFT - PMD_ORDER) |
1da177e4 | 331 | str r3, [r0] |
c77b0427 | 332 | #endif |
1b6ba46b CM |
333 | #endif |
334 | #ifdef CONFIG_ARM_LPAE | |
335 | sub r4, r4, #0x1000 @ point to the PGD table | |
4756dcbf | 336 | mov r4, r4, lsr #ARCH_PGD_SHIFT |
1da177e4 | 337 | #endif |
6ebbf2ce | 338 | ret lr |
93ed3970 | 339 | ENDPROC(__create_page_tables) |
1da177e4 | 340 | .ltorg |
4f79a5dd | 341 | .align |
72662e01 | 342 | __turn_mmu_on_loc: |
786f1b73 | 343 | .long . |
72662e01 WD |
344 | .long __turn_mmu_on |
345 | .long __turn_mmu_on_end | |
1da177e4 | 346 | |
00945010 | 347 | #if defined(CONFIG_SMP) |
2449189b | 348 | .text |
bafe5865 SB |
349 | ENTRY(secondary_startup_arm) |
350 | .arm | |
351 | THUMB( adr r9, BSYM(1f) ) @ Kernel is entered in ARM. | |
352 | THUMB( bx r9 ) @ If this is a Thumb-2 kernel, | |
353 | THUMB( .thumb ) @ switch to Thumb now. | |
354 | THUMB(1: ) | |
00945010 RK |
355 | ENTRY(secondary_startup) |
356 | /* | |
357 | * Common entry point for secondary CPUs. | |
358 | * | |
359 | * Ensure that we're in SVC mode, and IRQs are disabled. Lookup | |
360 | * the processor type - there is no need to check the machine type | |
361 | * as it has already been validated by the primary processor. | |
362 | */ | |
97bcb0fe BD |
363 | |
364 | ARM_BE8(setend be) @ ensure we are in BE8 mode | |
365 | ||
80c59daf | 366 | #ifdef CONFIG_ARM_VIRT_EXT |
6e484be1 | 367 | bl __hyp_stub_install_secondary |
80c59daf DM |
368 | #endif |
369 | safe_svcmode_maskall r9 | |
370 | ||
00945010 RK |
371 | mrc p15, 0, r9, c0, c0 @ get processor id |
372 | bl __lookup_processor_type | |
373 | movs r10, r5 @ invalid processor? | |
374 | moveq r0, #'p' @ yes, error 'p' | |
a75e5248 | 375 | THUMB( it eq ) @ force fixup-able long branch encoding |
00945010 RK |
376 | beq __error_p |
377 | ||
378 | /* | |
379 | * Use the page tables supplied from __cpu_up. | |
380 | */ | |
381 | adr r4, __secondary_data | |
382 | ldmia r4, {r5, r7, r12} @ address to jump to after | |
d427958a CM |
383 | sub lr, r4, r5 @ mmu has been enabled |
384 | ldr r4, [r7, lr] @ get secondary_data.pgdir | |
385 | add r7, r7, #4 | |
386 | ldr r8, [r7, lr] @ get secondary_data.swapper_pg_dir | |
00945010 RK |
387 | adr lr, BSYM(__enable_mmu) @ return address |
388 | mov r13, r12 @ __secondary_switched address | |
bf35706f AB |
389 | ldr r12, [r10, #PROCINFO_INITFUNC] |
390 | add r12, r12, r10 @ initialise processor | |
391 | @ (return control reg) | |
392 | ret r12 | |
00945010 | 393 | ENDPROC(secondary_startup) |
bafe5865 | 394 | ENDPROC(secondary_startup_arm) |
00945010 RK |
395 | |
396 | /* | |
397 | * r6 = &secondary_data | |
398 | */ | |
399 | ENTRY(__secondary_switched) | |
400 | ldr sp, [r7, #4] @ get secondary_data.stack | |
401 | mov fp, #0 | |
402 | b secondary_start_kernel | |
403 | ENDPROC(__secondary_switched) | |
404 | ||
4f79a5dd DM |
405 | .align |
406 | ||
00945010 RK |
407 | .type __secondary_data, %object |
408 | __secondary_data: | |
409 | .long . | |
410 | .long secondary_data | |
411 | .long __secondary_switched | |
412 | #endif /* defined(CONFIG_SMP) */ | |
413 | ||
414 | ||
415 | ||
416 | /* | |
417 | * Setup common bits before finally enabling the MMU. Essentially | |
418 | * this is just loading the page table pointer and domain access | |
419 | * registers. | |
865a4fae RK |
420 | * |
421 | * r0 = cp#15 control register | |
422 | * r1 = machine ID | |
4c2896e8 | 423 | * r2 = atags or dtb pointer |
4756dcbf | 424 | * r4 = page table (see ARCH_PGD_SHIFT in asm/memory.h) |
865a4fae RK |
425 | * r9 = processor ID |
426 | * r13 = *virtual* address to jump to upon completion | |
00945010 RK |
427 | */ |
428 | __enable_mmu: | |
8428e84d | 429 | #if defined(CONFIG_ALIGNMENT_TRAP) && __LINUX_ARM_ARCH__ < 6 |
00945010 RK |
430 | orr r0, r0, #CR_A |
431 | #else | |
432 | bic r0, r0, #CR_A | |
433 | #endif | |
434 | #ifdef CONFIG_CPU_DCACHE_DISABLE | |
435 | bic r0, r0, #CR_C | |
436 | #endif | |
437 | #ifdef CONFIG_CPU_BPREDICT_DISABLE | |
438 | bic r0, r0, #CR_Z | |
439 | #endif | |
440 | #ifdef CONFIG_CPU_ICACHE_DISABLE | |
441 | bic r0, r0, #CR_I | |
442 | #endif | |
4756dcbf | 443 | #ifndef CONFIG_ARM_LPAE |
00945010 RK |
444 | mov r5, #(domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ |
445 | domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ | |
446 | domain_val(DOMAIN_TABLE, DOMAIN_MANAGER) | \ | |
447 | domain_val(DOMAIN_IO, DOMAIN_CLIENT)) | |
448 | mcr p15, 0, r5, c3, c0, 0 @ load domain access register | |
449 | mcr p15, 0, r4, c2, c0, 0 @ load page table pointer | |
1b6ba46b | 450 | #endif |
00945010 RK |
451 | b __turn_mmu_on |
452 | ENDPROC(__enable_mmu) | |
453 | ||
454 | /* | |
455 | * Enable the MMU. This completely changes the structure of the visible | |
456 | * memory space. You will not be able to trace execution through this. | |
457 | * If you have an enquiry about this, *please* check the linux-arm-kernel | |
458 | * mailing list archives BEFORE sending another post to the list. | |
459 | * | |
460 | * r0 = cp#15 control register | |
865a4fae | 461 | * r1 = machine ID |
4c2896e8 | 462 | * r2 = atags or dtb pointer |
865a4fae | 463 | * r9 = processor ID |
00945010 RK |
464 | * r13 = *virtual* address to jump to upon completion |
465 | * | |
466 | * other registers depend on the function called upon completion | |
467 | */ | |
468 | .align 5 | |
4e8ee7de WD |
469 | .pushsection .idmap.text, "ax" |
470 | ENTRY(__turn_mmu_on) | |
00945010 | 471 | mov r0, r0 |
d675d0bc | 472 | instr_sync |
00945010 RK |
473 | mcr p15, 0, r0, c1, c0, 0 @ write control reg |
474 | mrc p15, 0, r3, c0, c0, 0 @ read id reg | |
d675d0bc | 475 | instr_sync |
00945010 RK |
476 | mov r3, r3 |
477 | mov r3, r13 | |
6ebbf2ce | 478 | ret r3 |
72662e01 | 479 | __turn_mmu_on_end: |
00945010 | 480 | ENDPROC(__turn_mmu_on) |
4e8ee7de | 481 | .popsection |
00945010 | 482 | |
1da177e4 | 483 | |
f00ec48f | 484 | #ifdef CONFIG_SMP_ON_UP |
1dc5455f | 485 | __HEAD |
f00ec48f | 486 | __fixup_smp: |
e98ff0f5 RK |
487 | and r3, r9, #0x000f0000 @ architecture version |
488 | teq r3, #0x000f0000 @ CPU ID supported? | |
f00ec48f RK |
489 | bne __fixup_smp_on_up @ no, assume UP |
490 | ||
e98ff0f5 RK |
491 | bic r3, r9, #0x00ff0000 |
492 | bic r3, r3, #0x0000000f @ mask 0xff00fff0 | |
493 | mov r4, #0x41000000 | |
0eb0511d | 494 | orr r4, r4, #0x0000b000 |
e98ff0f5 RK |
495 | orr r4, r4, #0x00000020 @ val 0x4100b020 |
496 | teq r3, r4 @ ARM 11MPCore? | |
6ebbf2ce | 497 | reteq lr @ yes, assume SMP |
f00ec48f RK |
498 | |
499 | mrc p15, 0, r0, c0, c0, 5 @ read MPIDR | |
e98ff0f5 RK |
500 | and r0, r0, #0xc0000000 @ multiprocessing extensions and |
501 | teq r0, #0x80000000 @ not part of a uniprocessor system? | |
bc41b872 SS |
502 | bne __fixup_smp_on_up @ no, assume UP |
503 | ||
504 | @ Core indicates it is SMP. Check for Aegis SOC where a single | |
505 | @ Cortex-A9 CPU is present but SMP operations fault. | |
506 | mov r4, #0x41000000 | |
507 | orr r4, r4, #0x0000c000 | |
508 | orr r4, r4, #0x00000090 | |
509 | teq r3, r4 @ Check for ARM Cortex-A9 | |
6ebbf2ce | 510 | retne lr @ Not ARM Cortex-A9, |
bc41b872 SS |
511 | |
512 | @ If a future SoC *does* use 0x0 as the PERIPH_BASE, then the | |
513 | @ below address check will need to be #ifdef'd or equivalent | |
514 | @ for the Aegis platform. | |
515 | mrc p15, 4, r0, c15, c0 @ get SCU base address | |
516 | teq r0, #0x0 @ '0' on actual UP A9 hardware | |
517 | beq __fixup_smp_on_up @ So its an A9 UP | |
518 | ldr r0, [r0, #4] @ read SCU Config | |
10593b2e | 519 | ARM_BE8(rev r0, r0) @ byteswap if big endian |
bc41b872 SS |
520 | and r0, r0, #0x3 @ number of CPUs |
521 | teq r0, #0x0 @ is 1? | |
6ebbf2ce | 522 | retne lr |
f00ec48f RK |
523 | |
524 | __fixup_smp_on_up: | |
525 | adr r0, 1f | |
0eb0511d | 526 | ldmia r0, {r3 - r5} |
f00ec48f | 527 | sub r3, r0, r3 |
0eb0511d RK |
528 | add r4, r4, r3 |
529 | add r5, r5, r3 | |
4a9cb360 | 530 | b __do_fixup_smp_on_up |
f00ec48f RK |
531 | ENDPROC(__fixup_smp) |
532 | ||
4f79a5dd | 533 | .align |
f00ec48f RK |
534 | 1: .word . |
535 | .word __smpalt_begin | |
536 | .word __smpalt_end | |
537 | ||
538 | .pushsection .data | |
539 | .globl smp_on_up | |
540 | smp_on_up: | |
541 | ALT_SMP(.long 1) | |
542 | ALT_UP(.long 0) | |
543 | .popsection | |
4a9cb360 | 544 | #endif |
f00ec48f | 545 | |
4a9cb360 RK |
546 | .text |
547 | __do_fixup_smp_on_up: | |
548 | cmp r4, r5 | |
6ebbf2ce | 549 | reths lr |
4a9cb360 RK |
550 | ldmia r4!, {r0, r6} |
551 | ARM( str r6, [r0, r3] ) | |
552 | THUMB( add r0, r0, r3 ) | |
553 | #ifdef __ARMEB__ | |
554 | THUMB( mov r6, r6, ror #16 ) @ Convert word order for big-endian. | |
f00ec48f | 555 | #endif |
4a9cb360 RK |
556 | THUMB( strh r6, [r0], #2 ) @ For Thumb-2, store as two halfwords |
557 | THUMB( mov r6, r6, lsr #16 ) @ to be robust against misaligned r3. | |
558 | THUMB( strh r6, [r0] ) | |
559 | b __do_fixup_smp_on_up | |
560 | ENDPROC(__do_fixup_smp_on_up) | |
561 | ||
562 | ENTRY(fixup_smp) | |
563 | stmfd sp!, {r4 - r6, lr} | |
564 | mov r4, r0 | |
565 | add r5, r0, r1 | |
566 | mov r3, #0 | |
567 | bl __do_fixup_smp_on_up | |
568 | ldmfd sp!, {r4 - r6, pc} | |
569 | ENDPROC(fixup_smp) | |
f00ec48f | 570 | |
830fd4d6 | 571 | #ifdef __ARMEB__ |
f52bb722 S |
572 | #define LOW_OFFSET 0x4 |
573 | #define HIGH_OFFSET 0x0 | |
574 | #else | |
575 | #define LOW_OFFSET 0x0 | |
576 | #define HIGH_OFFSET 0x4 | |
577 | #endif | |
578 | ||
dc21af99 RK |
579 | #ifdef CONFIG_ARM_PATCH_PHYS_VIRT |
580 | ||
581 | /* __fixup_pv_table - patch the stub instructions with the delta between | |
582 | * PHYS_OFFSET and PAGE_OFFSET, which is assumed to be 16MiB aligned and | |
583 | * can be expressed by an immediate shifter operand. The stub instruction | |
584 | * has a form of '(add|sub) rd, rn, #imm'. | |
585 | */ | |
586 | __HEAD | |
587 | __fixup_pv_table: | |
588 | adr r0, 1f | |
f52bb722 S |
589 | ldmia r0, {r3-r7} |
590 | mvn ip, #0 | |
591 | subs r3, r0, r3 @ PHYS_OFFSET - PAGE_OFFSET | |
dc21af99 RK |
592 | add r4, r4, r3 @ adjust table start address |
593 | add r5, r5, r3 @ adjust table end address | |
e26a9e00 | 594 | add r6, r6, r3 @ adjust __pv_phys_pfn_offset address |
f52bb722 | 595 | add r7, r7, r3 @ adjust __pv_offset address |
7a061928 | 596 | mov r0, r8, lsr #PAGE_SHIFT @ convert to PFN |
e3892e91 | 597 | str r0, [r6] @ save computed PHYS_OFFSET to __pv_phys_pfn_offset |
f52bb722 | 598 | strcc ip, [r7, #HIGH_OFFSET] @ save to __pv_offset high bits |
dc21af99 RK |
599 | mov r6, r3, lsr #24 @ constant for add/sub instructions |
600 | teq r3, r6, lsl #24 @ must be 16MiB aligned | |
b511d75d | 601 | THUMB( it ne @ cross section branch ) |
dc21af99 | 602 | bne __error |
f52bb722 | 603 | str r3, [r7, #LOW_OFFSET] @ save to __pv_offset low bits |
dc21af99 RK |
604 | b __fixup_a_pv_table |
605 | ENDPROC(__fixup_pv_table) | |
606 | ||
607 | .align | |
608 | 1: .long . | |
609 | .long __pv_table_begin | |
610 | .long __pv_table_end | |
e26a9e00 | 611 | 2: .long __pv_phys_pfn_offset |
f52bb722 | 612 | .long __pv_offset |
dc21af99 RK |
613 | |
614 | .text | |
615 | __fixup_a_pv_table: | |
f52bb722 S |
616 | adr r0, 3f |
617 | ldr r6, [r0] | |
618 | add r6, r6, r3 | |
619 | ldr r0, [r6, #HIGH_OFFSET] @ pv_offset high word | |
620 | ldr r6, [r6, #LOW_OFFSET] @ pv_offset low word | |
621 | mov r6, r6, lsr #24 | |
622 | cmn r0, #1 | |
b511d75d | 623 | #ifdef CONFIG_THUMB2_KERNEL |
f52bb722 | 624 | moveq r0, #0x200000 @ set bit 21, mov to mvn instruction |
daece596 NP |
625 | lsls r6, #24 |
626 | beq 2f | |
b511d75d NP |
627 | clz r7, r6 |
628 | lsr r6, #24 | |
629 | lsl r6, r7 | |
630 | bic r6, #0x0080 | |
631 | lsrs r7, #1 | |
632 | orrcs r6, #0x0080 | |
633 | orr r6, r6, r7, lsl #12 | |
634 | orr r6, #0x4000 | |
daece596 NP |
635 | b 2f |
636 | 1: add r7, r3 | |
637 | ldrh ip, [r7, #2] | |
2f9bf9be | 638 | ARM_BE8(rev16 ip, ip) |
f52bb722 S |
639 | tst ip, #0x4000 |
640 | and ip, #0x8f00 | |
641 | orrne ip, r6 @ mask in offset bits 31-24 | |
642 | orreq ip, r0 @ mask in offset bits 7-0 | |
2f9bf9be | 643 | ARM_BE8(rev16 ip, ip) |
b511d75d | 644 | strh ip, [r7, #2] |
2098990e RK |
645 | bne 2f |
646 | ldrh ip, [r7] | |
647 | ARM_BE8(rev16 ip, ip) | |
648 | bic ip, #0x20 | |
649 | orr ip, ip, r0, lsr #16 | |
650 | ARM_BE8(rev16 ip, ip) | |
651 | strh ip, [r7] | |
daece596 | 652 | 2: cmp r4, r5 |
b511d75d | 653 | ldrcc r7, [r4], #4 @ use branch for delay slot |
daece596 | 654 | bcc 1b |
b511d75d | 655 | bx lr |
d9a790df VK |
656 | #else |
657 | #ifdef CONFIG_CPU_ENDIAN_BE8 | |
658 | moveq r0, #0x00004000 @ set bit 22, mov to mvn instruction | |
b511d75d | 659 | #else |
f52bb722 | 660 | moveq r0, #0x400000 @ set bit 22, mov to mvn instruction |
d9a790df | 661 | #endif |
daece596 NP |
662 | b 2f |
663 | 1: ldr ip, [r7, r3] | |
2f9bf9be BD |
664 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
665 | @ in BE8, we load data in BE, but instructions still in LE | |
666 | bic ip, ip, #0xff000000 | |
2098990e RK |
667 | tst ip, #0x000f0000 @ check the rotation field |
668 | orrne ip, ip, r6, lsl #24 @ mask in offset bits 31-24 | |
669 | biceq ip, ip, #0x00004000 @ clear bit 22 | |
d9a790df | 670 | orreq ip, ip, r0 @ mask in offset bits 7-0 |
2f9bf9be | 671 | #else |
dc21af99 | 672 | bic ip, ip, #0x000000ff |
f52bb722 S |
673 | tst ip, #0xf00 @ check the rotation field |
674 | orrne ip, ip, r6 @ mask in offset bits 31-24 | |
675 | biceq ip, ip, #0x400000 @ clear bit 22 | |
676 | orreq ip, ip, r0 @ mask in offset bits 7-0 | |
2f9bf9be | 677 | #endif |
dc21af99 | 678 | str ip, [r7, r3] |
daece596 | 679 | 2: cmp r4, r5 |
dc21af99 | 680 | ldrcc r7, [r4], #4 @ use branch for delay slot |
daece596 | 681 | bcc 1b |
6ebbf2ce | 682 | ret lr |
b511d75d | 683 | #endif |
dc21af99 RK |
684 | ENDPROC(__fixup_a_pv_table) |
685 | ||
830fd4d6 | 686 | .align |
f52bb722 S |
687 | 3: .long __pv_offset |
688 | ||
dc21af99 RK |
689 | ENTRY(fixup_pv_table) |
690 | stmfd sp!, {r4 - r7, lr} | |
dc21af99 RK |
691 | mov r3, #0 @ no offset |
692 | mov r4, r0 @ r0 = table start | |
693 | add r5, r0, r1 @ r1 = table size | |
dc21af99 RK |
694 | bl __fixup_a_pv_table |
695 | ldmfd sp!, {r4 - r7, pc} | |
696 | ENDPROC(fixup_pv_table) | |
697 | ||
dc21af99 | 698 | .data |
e26a9e00 RK |
699 | .globl __pv_phys_pfn_offset |
700 | .type __pv_phys_pfn_offset, %object | |
701 | __pv_phys_pfn_offset: | |
702 | .word 0 | |
703 | .size __pv_phys_pfn_offset, . -__pv_phys_pfn_offset | |
f52bb722 S |
704 | |
705 | .globl __pv_offset | |
706 | .type __pv_offset, %object | |
dc21af99 | 707 | __pv_offset: |
f52bb722 S |
708 | .quad 0 |
709 | .size __pv_offset, . -__pv_offset | |
dc21af99 RK |
710 | #endif |
711 | ||
75d90832 | 712 | #include "head-common.S" |