2 * arch/arm/mm/proc-v7-3level.S
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
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.
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.
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
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)
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)
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)
43 * cpu_v7_switch_mm(pgd_phys, tsk)
45 * Set the translation table base pointer to be pgd_phys (physical address of
48 ENTRY(cpu_v7_switch_mm)
50 mmid r1, r1 @ get mm->context.id
52 mov r3, r3, lsl #(48 - 32) @ ASID
53 mcrr p15, 0, r0, r3, c2 @ set TTB 0
57 ENDPROC(cpu_v7_switch_mm)
60 * cpu_v7_set_pte_ext(ptep, pte)
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)
66 ENTRY(cpu_v7_set_pte_ext)
70 tst r3, #1 << (57 - 32) @ L_PTE_NONE
71 bicne r2, #L_PTE_VALID
73 tst r3, #1 << (55 - 32) @ L_PTE_DIRTY
74 orreq r2, #L_PTE_RDONLY
77 ALT_UP (mcr p15, 0, r0, c7, c10, 1) @ flush_pte
80 ENDPROC(cpu_v7_set_pte_ext)
83 * Memory region attributes for LPAE (defined in pgtable-3level.h):
88 * UNCACHED 000 00000000
89 * BUFFERABLE 001 01000100
91 * WRITETHROUGH 010 10101010
92 * WRITEBACK 011 11101110
93 * DEV_CACHED 011 11101110
94 * DEV_SHARED 100 00000100
95 * DEV_NONSHARED 100 00000100
98 * WRITEALLOC 111 11111111
100 .equ PRRR, 0xeeaa4400 @ MAIR0
101 .equ NMRR, 0xff000004 @ MAIR1
104 * Macro for setting up the TTBRx and TTBCR registers.
107 .macro v7_ttb_setup, zero, ttbr0, ttbr1, tmp
108 ldr \tmp, =swapper_pg_dir @ swapper_pg_dir virtual address
109 cmp \ttbr1, \tmp @ PHYS_OFFSET > PAGE_OFFSET? (branch below)
110 mrc p15, 0, \tmp, c2, c0, 2 @ TTB control register
111 orr \tmp, \tmp, #TTB_EAE
112 ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP)
113 ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP)
114 ALT_SMP(orr \tmp, \tmp, #TTB_FLAGS_SMP << 16)
115 ALT_UP(orr \tmp, \tmp, #TTB_FLAGS_UP << 16)
117 * TTBR0/TTBR1 split (PAGE_OFFSET):
118 * 0x40000000: T0SZ = 2, T1SZ = 0 (not used)
119 * 0x80000000: T0SZ = 0, T1SZ = 1
120 * 0xc0000000: T0SZ = 0, T1SZ = 2
122 * Only use this feature if PHYS_OFFSET <= PAGE_OFFSET, otherwise
123 * booting secondary CPUs would end up using TTBR1 for the identity
124 * mapping set up in TTBR0.
126 bhi 9001f @ PHYS_OFFSET > PAGE_OFFSET?
127 orr \tmp, \tmp, #(((PAGE_OFFSET >> 30) - 1) << 16) @ TTBCR.T1SZ
128 #if defined CONFIG_VMSPLIT_2G
129 /* PAGE_OFFSET == 0x80000000, T1SZ == 1 */
130 add \ttbr1, \ttbr1, #1 << 4 @ skip two L1 entries
131 #elif defined CONFIG_VMSPLIT_3G
132 /* PAGE_OFFSET == 0xc0000000, T1SZ == 2 */
133 add \ttbr1, \ttbr1, #4096 * (1 + 3) @ only L2 used, skip pgd+3*pmd
135 /* CONFIG_VMSPLIT_1G does not need TTBR1 adjustment */
136 9001: mcr p15, 0, \tmp, c2, c0, 2 @ TTB control register
137 mcrr p15, 1, \ttbr1, \zero, c2 @ load TTBR1
144 * TFR EV X F IHD LR S
145 * .EEE ..EE PUI. .TAT 4RVI ZWRS BLDP WCAM
146 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
147 * 11 0 110 1 0011 1100 .111 1101 < we want
150 .type v7_crval, #object
152 crval clear=0x0120c302, mmuset=0x30c23c7d, ucset=0x00c01c7c