2 * linux/arch/arm/mm/proc-v6.S
4 * Copyright (C) 2001 Deep Blue Solutions Ltd.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This is the "shell" of the ARMv6 processor support.
12 #include <linux/linkage.h>
13 #include <asm/assembler.h>
14 #include <asm/asm-offsets.h>
15 #include <asm/hardware/arm_scu.h>
16 #include <asm/procinfo.h>
17 #include <asm/pgtable-hwdef.h>
18 #include <asm/pgtable.h>
20 #include "proc-macros.S"
22 #define D_CACHE_LINE_SIZE 32
56 ENTRY(cpu_v6_proc_init)
59 ENTRY(cpu_v6_proc_fin)
61 cpsid if @ disable interrupts
62 bl v6_flush_kern_cache_all
63 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
64 bic r0, r0, #0x1000 @ ...i............
65 bic r0, r0, #0x0006 @ .............ca.
66 mcr p15, 0, r0, c1, c0, 0 @ disable caches
72 * Perform a soft reset of the system. Put the CPU into the
73 * same state as it would be if it had been reset, and branch
74 * to what would be the reset vector.
76 * - loc - location to jump to for soft reset
87 * Idle the processor (eg, wait for interrupt).
89 * IRQs are already disabled.
92 mcr p15, 0, r1, c7, c0, 4 @ wait for interrupt
95 ENTRY(cpu_v6_dcache_clean_area)
96 #ifndef TLB_CAN_READ_FROM_L1_CACHE
97 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
98 add r0, r0, #D_CACHE_LINE_SIZE
99 subs r1, r1, #D_CACHE_LINE_SIZE
105 * cpu_arm926_switch_mm(pgd_phys, tsk)
107 * Set the translation table base pointer to be pgd_phys
109 * - pgd_phys - physical address of new TTB
111 * It is assumed that:
112 * - we are not using split page tables
114 ENTRY(cpu_v6_switch_mm)
116 ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id
118 orr r0, r0, #2 @ set shared pgtable
120 mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB
121 mcr p15, 0, r2, c7, c10, 4 @ drain write buffer
122 mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
123 mcr p15, 0, r1, c13, c0, 1 @ set context ID
127 * cpu_v6_set_pte(ptep, pte)
129 * Set a level 2 translation table entry.
131 * - ptep - pointer to level 2 translation table entry
132 * (hardware version is stored at -1024 bytes)
133 * - pte - PTE value to store
136 * YUWD APX AP1 AP0 SVC User
137 * 0xxx 0 0 0 no acc no acc
138 * 100x 1 0 1 r/o no acc
139 * 10x0 1 0 1 r/o no acc
140 * 1011 0 0 1 r/w no acc
145 ENTRY(cpu_v6_set_pte)
146 str r1, [r0], #-2048 @ linux version
148 bic r2, r1, #0x000003f0
149 bic r2, r2, #0x00000003
150 orr r2, r2, #PTE_EXT_AP0 | 2
153 tstne r1, #L_PTE_DIRTY
154 orreq r2, r2, #PTE_EXT_APX
157 orrne r2, r2, #PTE_EXT_AP1
158 tstne r2, #PTE_EXT_APX
159 bicne r2, r2, #PTE_EXT_APX | PTE_EXT_AP0
162 biceq r2, r2, #PTE_EXT_APX | PTE_EXT_AP_MASK
164 @ tst r1, #L_PTE_EXEC
165 @ orreq r2, r2, #PTE_EXT_XN
167 tst r1, #L_PTE_PRESENT
171 mcr p15, 0, r0, c7, c10, 1 @ flush_pte
178 .asciz "Some Random V6 Processor"
181 .section ".text.init", #alloc, #execinstr
186 * Initialise TLB, Caches, and MMU state ready to switch the MMU
187 * on. Return in r0 the new CP15 C1 control register setting.
189 * We automatically detect if we have a Harvard cache, and use the
190 * Harvard cache control instructions insead of the unified cache
191 * control instructions.
193 * This should be able to cover all ARMv6 cores.
195 * It is assumed that:
196 * - cache type register is implemented
200 /* Set up the SCU on core 0 only */
201 mrc p15, 0, r0, c0, c0, 5 @ CPU core number
203 moveq r0, #0x10000000 @ SCU_BASE
204 orreq r0, r0, #0x00100000
205 ldreq r5, [r0, #SCU_CTRL]
207 streq r5, [r0, #SCU_CTRL]
209 #ifndef CONFIG_CPU_DCACHE_DISABLE
210 mrc p15, 0, r0, c1, c0, 1 @ Enable SMP/nAMP mode
212 mcr p15, 0, r0, c1, c0, 1
217 mcr p15, 0, r0, c7, c14, 0 @ clean+invalidate D cache
218 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
219 mcr p15, 0, r0, c7, c15, 0 @ clean+invalidate cache
220 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
221 mcr p15, 0, r0, c8, c7, 0 @ invalidate I + D TLBs
222 mcr p15, 0, r0, c2, c0, 2 @ TTB control register
224 orr r4, r4, #2 @ set shared pgtable
226 mcr p15, 0, r4, c2, c0, 1 @ load TTB1
228 mrc p15, 0, r0, c1, c0, 2
229 orr r0, r0, #(0xf << 20)
230 mcr p15, 0, r0, c1, c0, 2 @ Enable full access to VFP
232 mrc p15, 0, r0, c1, c0, 0 @ read control register
233 ldr r5, v6_cr1_clear @ get mask for bits to clear
234 bic r0, r0, r5 @ clear bits them
235 ldr r5, v6_cr1_set @ get mask for bits to set
236 orr r0, r0, r5 @ set them
237 mov pc, lr @ return to head.S:__ret
241 * .... ...E PUI. .T.T 4RVI ZFRS BLDP WCAM
242 * rrrr rrrx xxx0 0101 xxxx xxxx x111 xxxx < forced
243 * 0 110 0011 1.00 .111 1101 < we want
245 .type v6_cr1_clear, #object
246 .type v6_cr1_set, #object
252 .type v6_processor_functions, #object
253 ENTRY(v6_processor_functions)
255 .word cpu_v6_proc_init
256 .word cpu_v6_proc_fin
259 .word cpu_v6_dcache_clean_area
260 .word cpu_v6_switch_mm
262 .size v6_processor_functions, . - v6_processor_functions
264 .type cpu_arch_name, #object
267 .size cpu_arch_name, . - cpu_arch_name
269 .type cpu_elf_name, #object
272 .size cpu_elf_name, . - cpu_elf_name
275 .section ".proc.info.init", #alloc, #execinstr
278 * Match any ARMv6 processor core.
280 .type __v6_proc_info, #object
284 .long PMD_TYPE_SECT | \
285 PMD_SECT_BUFFERABLE | \
286 PMD_SECT_CACHEABLE | \
287 PMD_SECT_AP_WRITE | \
292 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_VFP|HWCAP_EDSP|HWCAP_JAVA
294 .long v6_processor_functions
298 .size __v6_proc_info, . - __v6_proc_info