1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * arch/arm/mm/proc-v7-3level.S
4 *
5 * Copyright (C) 2001 Deep Blue Solutions Ltd.
6 * Copyright (C) 2011 ARM Ltd.
7 * Author: Catalin Marinas <catalin.marinas@arm.com>
8 * based on arch/arm/mm/proc-v7-2level.S
9 */
10#include <asm/assembler.h>
11
12#define TTB_IRGN_NC (0 << 8)
13#define TTB_IRGN_WBWA (1 << 8)
14#define TTB_IRGN_WT (2 << 8)
15#define TTB_IRGN_WB (3 << 8)
16#define TTB_RGN_NC (0 << 10)
17#define TTB_RGN_OC_WBWA (1 << 10)
18#define TTB_RGN_OC_WT (2 << 10)
19#define TTB_RGN_OC_WB (3 << 10)
20#define TTB_S (3 << 12)
21#define TTB_EAE (1 << 31)
22
23/* PTWs cacheable, inner WB not shareable, outer WB not shareable */
24#define TTB_FLAGS_UP (TTB_IRGN_WB|TTB_RGN_OC_WB)
25#define PMD_FLAGS_UP (PMD_SECT_WB)
26
27/* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */
28#define TTB_FLAGS_SMP (TTB_IRGN_WBWA|TTB_S|TTB_RGN_OC_WBWA)
29#define PMD_FLAGS_SMP (PMD_SECT_WBWA|PMD_SECT_S)
30
31#ifndef __ARMEB__
32# define rpgdl r0
33# define rpgdh r1
34#else
35# define rpgdl r1
36# define rpgdh r0
37#endif
38
39/*
40 * cpu_v7_switch_mm(pgd_phys, tsk)
41 *
42 * Set the translation table base pointer to be pgd_phys (physical address of
43 * the new TTB).
44 */
45ENTRY(cpu_v7_switch_mm)
46#ifdef CONFIG_MMU
47 mmid r2, r2
48 asid r2, r2
49 orr rpgdh, rpgdh, r2, lsl #(48 - 32) @ upper 32-bits of pgd
50 mcrr p15, 0, rpgdl, rpgdh, c2 @ set TTB 0
51 isb
52#endif
53 ret lr
54ENDPROC(cpu_v7_switch_mm)
55
56#ifdef __ARMEB__
57#define rl r3
58#define rh r2
59#else
60#define rl r2
61#define rh r3
62#endif
63
64/*
65 * cpu_v7_set_pte_ext(ptep, pte)
66 *
67 * Set a level 2 translation table entry.
68 * - ptep - pointer to level 3 translation table entry
69 * - pte - PTE value to store (64-bit in r2 and r3)
70 */
71ENTRY(cpu_v7_set_pte_ext)
72#ifdef CONFIG_MMU
73 tst rl, #L_PTE_VALID
74 beq 1f
75 tst rh, #1 << (57 - 32) @ L_PTE_NONE
76 bicne rl, #L_PTE_VALID
77 bne 1f
78
79 eor ip, rh, #1 << (55 - 32) @ toggle L_PTE_DIRTY in temp reg to
80 @ test for !L_PTE_DIRTY || L_PTE_RDONLY
81 tst ip, #1 << (55 - 32) | 1 << (58 - 32)
82 orrne rl, #PTE_AP2
83 biceq rl, #PTE_AP2
84
851: strd r2, r3, [r0]
86 ALT_SMP(W(nop))
87 ALT_UP (mcr p15, 0, r0, c7, c10, 1) @ flush_pte
88#endif
89 ret lr
90ENDPROC(cpu_v7_set_pte_ext)
91
92 /*
93 * Memory region attributes for LPAE (defined in pgtable-3level.h):
94 *
95 * n = AttrIndx[2:0]
96 *
97 * n MAIR
98 * UNCACHED 000 00000000
99 * BUFFERABLE 001 01000100
100 * DEV_WC 001 01000100
101 * WRITETHROUGH 010 10101010
102 * WRITEBACK 011 11101110
103 * DEV_CACHED 011 11101110
104 * DEV_SHARED 100 00000100
105 * DEV_NONSHARED 100 00000100
106 * unused 101
107 * unused 110
108 * WRITEALLOC 111 11111111
109 */
110.equ PRRR, 0xeeaa4400 @ MAIR0
111.equ NMRR, 0xff000004 @ MAIR1
112
113 /*
114 * Macro for setting up the TTBRx and TTBCR registers.
115 * - \ttbr1 updated.
116 */
117 .macro v7_ttb_setup, zero, ttbr0l, ttbr0h, ttbr1, tmp
118 ldr \tmp, =swapper_pg_dir @ swapper_pg_dir virtual address
119 cmp \ttbr1, \tmp, lsr #12 @ PHYS_OFFSET > PAGE_OFFSET?
120 mov \tmp, #TTB_EAE @ for TTB control egister
121 ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP)
122 ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP)
123 ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP << 16)
124 ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP << 16)
125 /*
126 * Only use split TTBRs if PHYS_OFFSET <= PAGE_OFFSET (cmp above),
127 * otherwise booting secondary CPUs would end up using TTBR1 for the
128 * identity mapping set up in TTBR0.
129 */
130 orrls \tmp, \tmp, #TTBR1_SIZE @ TTBCR.T1SZ
131 mcr p15, 0, \tmp, c2, c0, 2 @ TTBCR
132 mov \tmp, \ttbr1, lsr #20
133 mov \ttbr1, \ttbr1, lsl #12
134 addls \ttbr1, \ttbr1, #TTBR1_OFFSET
135 mcrr p15, 1, \ttbr1, \tmp, c2 @ load TTBR1
136 .endm
137
138 /*
139 * AT
140 * TFR EV X F IHD LR S
141 * .EEE ..EE PUI. .TAT 4RVI ZWRS BLDP WCAM
142 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
143 * 11 0 110 0 0011 1100 .111 1101 < we want
144 */
145 .align 2
146 .type v7_crval, #object
147v7_crval:
148 crval clear=0x0122c302, mmuset=0x30c03c7d, ucset=0x00c01c7c
149

source code of linux/arch/arm/mm/proc-v7-3level.S