Gitiles
Code Review Sign In
review.evervolv.com / android_kernel_oneplus_msm8996 / 30a1b5ef0c953a7ba82169c46f92f52fa11ee15e / . / arch / arm / mm / proc-v7-3level.S
blob: 50bf1dafc9eafca49cf80a32ffbf5b529cb0cf40 [file] [log] [blame]
Catalin Marinas1b6ba462011-11-22 17:30:29 +0000[diff] [blame]1/*
2 * arch/arm/mm/proc-v7-3level.S
3 *
4 * Copyright (C) 2001 Deep Blue Solutions Ltd.
5 * Copyright (C) 2011 ARM Ltd.
6 * Author: Catalin Marinas <catalin.marinas@arm.com>
7 * based on arch/arm/mm/proc-v7-2level.S
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#define TTB_IRGN_NC (0 << 8)
24#define TTB_IRGN_WBWA (1 << 8)
25#define TTB_IRGN_WT (2 << 8)
26#define TTB_IRGN_WB (3 << 8)
27#define TTB_RGN_NC (0 << 10)
28#define TTB_RGN_OC_WBWA (1 << 10)
29#define TTB_RGN_OC_WT (2 << 10)
30#define TTB_RGN_OC_WB (3 << 10)
31#define TTB_S (3 << 12)
32#define TTB_EAE (1 << 31)
33
34/* PTWs cacheable, inner WB not shareable, outer WB not shareable */
35#define TTB_FLAGS_UP (TTB_IRGN_WB|TTB_RGN_OC_WB)
36#define PMD_FLAGS_UP (PMD_SECT_WB)
37
38/* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */
39#define TTB_FLAGS_SMP (TTB_IRGN_WBWA|TTB_S|TTB_RGN_OC_WBWA)
40#define PMD_FLAGS_SMP (PMD_SECT_WBWA|PMD_SECT_S)
41
42/*
43 * cpu_v7_switch_mm(pgd_phys, tsk)
44 *
45 * Set the translation table base pointer to be pgd_phys (physical address of
46 * the new TTB).
47 */
48ENTRY(cpu_v7_switch_mm)
49#ifdef CONFIG_MMU
Ben Dooks251019f2013-02-11 12:25:05 +0100[diff] [blame]50 mmid r1, r1 @ get mm->context.id
Catalin Marinas1b6ba462011-11-22 17:30:29 +0000[diff] [blame]51 and r3, r1, #0xff
52 mov r3, r3, lsl #(48 - 32) @ ASID
53 mcrr p15, 0, r0, r3, c2 @ set TTB 0
54 isb
55#endif
56 mov pc, lr
57ENDPROC(cpu_v7_switch_mm)
58
59/*
60 * cpu_v7_set_pte_ext(ptep, pte)
61 *
62 * Set a level 2 translation table entry.
63 * - ptep - pointer to level 3 translation table entry
64 * - pte - PTE value to store (64-bit in r2 and r3)
65 */
66ENTRY(cpu_v7_set_pte_ext)
67#ifdef CONFIG_MMU
Will Deacondbf62d52012-07-19 11:51:05 +0100[diff] [blame]68 tst r2, #L_PTE_VALID
Catalin Marinas1b6ba462011-11-22 17:30:29 +0000[diff] [blame]69 beq 1f
Will Deacon26ffd0d2012-09-01 05:22:12 +0100[diff] [blame]70 tst r3, #1 << (57 - 32) @ L_PTE_NONE
71 bicne r2, #L_PTE_VALID
72 bne 1f
Catalin Marinas1b6ba462011-11-22 17:30:29 +0000[diff] [blame]73 tst r3, #1 << (55 - 32) @ L_PTE_DIRTY
74 orreq r2, #L_PTE_RDONLY
751: strd r2, r3, [r0]
76 mcr p15, 0, r0, c7, c10, 1 @ flush_pte
77#endif
78 mov pc, lr
79ENDPROC(cpu_v7_set_pte_ext)
80
81 /*
82 * Memory region attributes for LPAE (defined in pgtable-3level.h):
83 *
84 * n = AttrIndx[2:0]
85 *
86 * n MAIR
87 * UNCACHED 000 00000000
88 * BUFFERABLE 001 01000100
89 * DEV_WC 001 01000100
90 * WRITETHROUGH 010 10101010
91 * WRITEBACK 011 11101110
92 * DEV_CACHED 011 11101110
93 * DEV_SHARED 100 00000100
94 * DEV_NONSHARED 100 00000100
95 * unused 101
96 * unused 110
97 * WRITEALLOC 111 11111111
98 */
99.equ PRRR, 0xeeaa4400 @ MAIR0
100.equ NMRR, 0xff000004 @ MAIR1
101
102 /*
103 * Macro for setting up the TTBRx and TTBCR registers.
104 * - \ttbr1 updated.
105 */
106 .macro v7_ttb_setup, zero, ttbr0, ttbr1, tmp
107 ldr \tmp, =swapper_pg_dir @ swapper_pg_dir virtual address
108 cmp \ttbr1, \tmp @ PHYS_OFFSET > PAGE_OFFSET? (branch below)
109 mrc p15, 0, \tmp, c2, c0, 2 @ TTB control register
110 orr \tmp, \tmp, #TTB_EAE
111 ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP)
112 ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP)
113 ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP << 16)
114 ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP << 16)
115 /*
116 * TTBR0/TTBR1 split (PAGE_OFFSET):
117 * 0x40000000: T0SZ = 2, T1SZ = 0 (not used)
118 * 0x80000000: T0SZ = 0, T1SZ = 1
119 * 0xc0000000: T0SZ = 0, T1SZ = 2
120 *
121 * Only use this feature if PHYS_OFFSET <= PAGE_OFFSET, otherwise
122 * booting secondary CPUs would end up using TTBR1 for the identity
123 * mapping set up in TTBR0.
124 */
125 bhi 9001f @ PHYS_OFFSET > PAGE_OFFSET?
126 orr \tmp, \tmp, #(((PAGE_OFFSET >> 30) - 1) << 16) @ TTBCR.T1SZ
127#if defined CONFIG_VMSPLIT_2G
128 /* PAGE_OFFSET == 0x80000000, T1SZ == 1 */
129 add \ttbr1, \ttbr1, #1 << 4 @ skip two L1 entries
130#elif defined CONFIG_VMSPLIT_3G
131 /* PAGE_OFFSET == 0xc0000000, T1SZ == 2 */
132 add \ttbr1, \ttbr1, #4096 * (1 + 3) @ only L2 used, skip pgd+3*pmd
133#endif
134 /* CONFIG_VMSPLIT_1G does not need TTBR1 adjustment */
1359001: mcr p15, 0, \tmp, c2, c0, 2 @ TTB control register
136 mcrr p15, 1, \ttbr1, \zero, c2 @ load TTBR1
137 .endm
138
139 __CPUINIT
140
141 /*
142 * AT
143 * TFR EV X F IHD LR S
144 * .EEE ..EE PUI. .TAT 4RVI ZWRS BLDP WCAM
145 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
146 * 11 0 110 1 0011 1100 .111 1101 < we want
147 */
148 .align 2
149 .type v7_crval, #object
150v7_crval:
151 crval clear=0x0120c302, mmuset=0x30c23c7d, ucset=0x00c01c7c
152
153 .previous