1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * arch/arm/mm/proc-v7-2level.S
5 * Copyright (C) 2001 Deep Blue Solutions Ltd.
9 #define TTB_RGN_NC (0 << 3)
10 #define TTB_RGN_OC_WBWA (1 << 3)
11 #define TTB_RGN_OC_WT (2 << 3)
12 #define TTB_RGN_OC_WB (3 << 3)
13 #define TTB_NOS (1 << 5)
14 #define TTB_IRGN_NC ((0 << 0) | (0 << 6))
15 #define TTB_IRGN_WBWA ((0 << 0) | (1 << 6))
16 #define TTB_IRGN_WT ((1 << 0) | (0 << 6))
17 #define TTB_IRGN_WB ((1 << 0) | (1 << 6))
19 /* PTWs cacheable, inner WB not shareable, outer WB not shareable */
20 #define TTB_FLAGS_UP TTB_IRGN_WB|TTB_RGN_OC_WB
21 #define PMD_FLAGS_UP PMD_SECT_WB
23 /* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */
24 #define TTB_FLAGS_SMP TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA
25 #define PMD_FLAGS_SMP PMD_SECT_WBWA|PMD_SECT_S
30 * cpu_v7_switch_mm(pgd_phys, tsk)
32 * Set the translation table base pointer to be pgd_phys
34 * - pgd_phys - physical address of new TTB
37 * - we are not using split page tables
39 * Note that we always need to flush BTAC/BTB if IBE is set
40 * even on Cortex-A8 revisions not affected by 430973.
41 * If IBE is not set, the flush BTAC/BTB won't do anything.
43 ENTRY(cpu_v7_switch_mm)
45 mmid r1, r1 @ get mm->context.id
46 ALT_SMP(orr r0, r0, #TTB_FLAGS_SMP)
47 ALT_UP(orr r0, r0, #TTB_FLAGS_UP)
48 #ifdef CONFIG_PID_IN_CONTEXTIDR
49 mrc p15, 0, r2, c13, c0, 1 @ read current context ID
50 lsr r2, r2, #8 @ extract the PID
51 bfi r1, r2, #8, #24 @ insert into new context ID
53 #ifdef CONFIG_ARM_ERRATA_754322
56 mcr p15, 0, r1, c13, c0, 1 @ set context ID
58 mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
62 ENDPROC(cpu_v7_switch_mm)
65 * cpu_v7_set_pte_ext(ptep, pte)
67 * Set a level 2 translation table entry.
69 * - ptep - pointer to level 2 translation table entry
70 * (hardware version is stored at +2048 bytes)
71 * - pte - PTE value to store
72 * - ext - value for extended PTE bits
74 ENTRY(cpu_v7_set_pte_ext)
76 str r1, [r0] @ linux version
78 bic r3, r1, #0x000003f0
79 bic r3, r3, #PTE_TYPE_MASK
81 orr r3, r3, #PTE_EXT_AP0 | 2
84 orrne r3, r3, #PTE_EXT_TEX(1)
86 eor r1, r1, #L_PTE_DIRTY
87 tst r1, #L_PTE_RDONLY | L_PTE_DIRTY
88 orrne r3, r3, #PTE_EXT_APX
91 orrne r3, r3, #PTE_EXT_AP1
94 orrne r3, r3, #PTE_EXT_XN
97 tstne r1, #L_PTE_VALID
98 eorne r1, r1, #L_PTE_NONE
102 ARM( str r3, [r0, #2048]! )
103 THUMB( add r0, r0, #2048 )
104 THUMB( str r3, [r0] )
106 ALT_UP (mcr p15, 0, r0, c7, c10, 1) @ flush_pte
109 ENDPROC(cpu_v7_set_pte_ext)
112 * Memory region attributes with SCTLR.TRE=1
115 * TR = PRRR[2n+1:2n] - memory type
116 * IR = NMRR[2n+1:2n] - inner cacheable property
117 * OR = NMRR[2n+17:2n+16] - outer cacheable property
121 * BUFFERABLE 001 10 00 00
122 * WRITETHROUGH 010 10 10 10
123 * WRITEBACK 011 10 11 11
125 * WRITEALLOC 111 10 01 01
127 * DEV_NONSHARED 100 01
133 * DS0 = PRRR[16] = 0 - device shareable property
134 * DS1 = PRRR[17] = 1 - device shareable property
135 * NS0 = PRRR[18] = 0 - normal shareable property
136 * NS1 = PRRR[19] = 1 - normal shareable property
137 * NOS = PRRR[24+n] = 1 - not outer shareable
139 .equ PRRR, 0xff0a81a8
140 .equ NMRR, 0x40e040e0
143 * Macro for setting up the TTBRx and TTBCR registers.
144 * - \ttb0 and \ttb1 updated with the corresponding flags.
146 .macro v7_ttb_setup, zero, ttbr0l, ttbr0h, ttbr1, tmp
147 mcr p15, 0, \zero, c2, c0, 2 @ TTB control register
148 ALT_SMP(orr \ttbr0l, \ttbr0l, #TTB_FLAGS_SMP)
149 ALT_UP(orr \ttbr0l, \ttbr0l, #TTB_FLAGS_UP)
150 ALT_SMP(orr \ttbr1, \ttbr1, #TTB_FLAGS_SMP)
151 ALT_UP(orr \ttbr1, \ttbr1, #TTB_FLAGS_UP)
152 mcr p15, 0, \ttbr1, c2, c0, 1 @ load TTB1
156 * TFR EV X F I D LR S
157 * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
158 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
159 * 01 0 110 0011 1100 .111 1101 < we want
162 .type v7_crval, #object
164 crval clear=0x2120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c