2 * linux/arch/arm/mm/proc-v7.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 ARMv7 processor support.
12 #include <linux/linkage.h>
13 #include <asm/assembler.h>
14 #include <asm/asm-offsets.h>
15 #include <asm/hwcap.h>
16 #include <asm/pgtable-hwdef.h>
17 #include <asm/pgtable.h>
19 #include "proc-macros.S"
21 #define TTB_C (1 << 0)
22 #define TTB_S (1 << 1)
23 #define TTB_RGN_NC (0 << 3)
24 #define TTB_RGN_OC_WBWA (1 << 3)
25 #define TTB_RGN_OC_WT (2 << 3)
26 #define TTB_RGN_OC_WB (3 << 3)
29 #define TTB_FLAGS TTB_C|TTB_RGN_OC_WB @ mark PTWs cacheable, outer WB
31 #define TTB_FLAGS TTB_C|TTB_S|TTB_RGN_OC_WBWA @ mark PTWs cacheable and shared, outer WBWA
34 ENTRY(cpu_v7_proc_init)
36 ENDPROC(cpu_v7_proc_init)
38 ENTRY(cpu_v7_proc_fin)
40 ENDPROC(cpu_v7_proc_fin)
45 * Perform a soft reset of the system. Put the CPU into the
46 * same state as it would be if it had been reset, and branch
47 * to what would be the reset vector.
49 * - loc - location to jump to for soft reset
61 * Idle the processor (eg, wait for interrupt).
63 * IRQs are already disabled.
66 dsb @ WFI may enter a low-power mode
69 ENDPROC(cpu_v7_do_idle)
71 ENTRY(cpu_v7_dcache_clean_area)
72 #ifndef TLB_CAN_READ_FROM_L1_CACHE
73 dcache_line_size r2, r3
74 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
81 ENDPROC(cpu_v7_dcache_clean_area)
84 * cpu_v7_switch_mm(pgd_phys, tsk)
86 * Set the translation table base pointer to be pgd_phys
88 * - pgd_phys - physical address of new TTB
91 * - we are not using split page tables
93 ENTRY(cpu_v7_switch_mm)
96 ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id
97 orr r0, r0, #TTB_FLAGS
98 mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID
100 1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
102 mcr p15, 0, r1, c13, c0, 1 @ set context ID
106 ENDPROC(cpu_v7_switch_mm)
109 * cpu_v7_set_pte_ext(ptep, pte)
111 * Set a level 2 translation table entry.
113 * - ptep - pointer to level 2 translation table entry
114 * (hardware version is stored at -1024 bytes)
115 * - pte - PTE value to store
116 * - ext - value for extended PTE bits
118 ENTRY(cpu_v7_set_pte_ext)
120 str r1, [r0], #-2048 @ linux version
122 bic r3, r1, #0x000003f0
123 bic r3, r3, #PTE_TYPE_MASK
125 orr r3, r3, #PTE_EXT_AP0 | 2
128 orrne r3, r3, #PTE_EXT_TEX(1)
131 tstne r1, #L_PTE_DIRTY
132 orreq r3, r3, #PTE_EXT_APX
135 orrne r3, r3, #PTE_EXT_AP1
136 tstne r3, #PTE_EXT_APX
137 bicne r3, r3, #PTE_EXT_APX | PTE_EXT_AP0
140 orreq r3, r3, #PTE_EXT_XN
143 tstne r1, #L_PTE_PRESENT
147 mcr p15, 0, r0, c7, c10, 1 @ flush_pte
150 ENDPROC(cpu_v7_set_pte_ext)
153 .ascii "ARMv7 Processor"
156 .section ".text.init", #alloc, #execinstr
161 * Initialise TLB, Caches, and MMU state ready to switch the MMU
162 * on. Return in r0 the new CP15 C1 control register setting.
164 * We automatically detect if we have a Harvard cache, and use the
165 * Harvard cache control instructions insead of the unified cache
166 * control instructions.
168 * This should be able to cover all ARMv7 cores.
170 * It is assumed that:
171 * - cache type register is implemented
175 mrc p15, 0, r0, c1, c0, 1 @ Enable SMP/nAMP mode
176 orr r0, r0, #(0x1 << 6)
177 mcr p15, 0, r0, c1, c0, 1
179 adr r12, __v7_setup_stack @ the local stack
180 stmia r12, {r0-r5, r7, r9, r11, lr}
181 bl v7_flush_dcache_all
182 ldmia r12, {r0-r5, r7, r9, r11, lr}
185 mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate
189 mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs
190 mcr p15, 0, r10, c2, c0, 2 @ TTB control register
191 orr r4, r4, #TTB_FLAGS
192 mcr p15, 0, r4, c2, c0, 1 @ load TTB1
193 mov r10, #0x1f @ domains 0, 1 = manager
194 mcr p15, 0, r10, c3, c0, 0 @ load domain access register
198 mcr p15, 0, r5, c10, c2, 0 @ write PRRR
199 mcr p15, 0, r6, c10, c2, 1 @ write NMRR
202 mrc p15, 0, r0, c1, c0, 0 @ read control register
203 bic r0, r0, r5 @ clear bits them
204 orr r0, r0, r6 @ set them
205 mov pc, lr @ return to head.S:__ret
210 * .EEE ..EE PUI. .T.T 4RVI ZFRS BLDP WCAM
211 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
212 * 1 0 110 0011 1.00 .111 1101 < we want
214 .type v7_crval, #object
216 crval clear=0x0120c302, mmuset=0x10c0387d, ucset=0x00c0187c
219 .space 4 * 11 @ 11 registers
221 .type v7_processor_functions, #object
222 ENTRY(v7_processor_functions)
225 .word cpu_v7_proc_init
226 .word cpu_v7_proc_fin
229 .word cpu_v7_dcache_clean_area
230 .word cpu_v7_switch_mm
231 .word cpu_v7_set_pte_ext
232 .size v7_processor_functions, . - v7_processor_functions
234 .type cpu_arch_name, #object
237 .size cpu_arch_name, . - cpu_arch_name
239 .type cpu_elf_name, #object
242 .size cpu_elf_name, . - cpu_elf_name
245 .section ".proc.info.init", #alloc, #execinstr
248 * Match any ARMv7 processor core.
250 .type __v7_proc_info, #object
252 .long 0x000f0000 @ Required ID value
253 .long 0x000f0000 @ Mask for ID
254 .long PMD_TYPE_SECT | \
255 PMD_SECT_BUFFERABLE | \
256 PMD_SECT_CACHEABLE | \
257 PMD_SECT_AP_WRITE | \
259 .long PMD_TYPE_SECT | \
261 PMD_SECT_AP_WRITE | \
266 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
268 .long v7_processor_functions
272 .size __v7_proc_info, . - __v7_proc_info