summaryrefslogtreecommitdiffstats
path: root/arch/arm/mm/proc-v7-3level.S
blob: 01a719e18bb047c655694c336d5a42e1388d1062 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/*
 * arch/arm/mm/proc-v7-3level.S
 *
 * Copyright (C) 2001 Deep Blue Solutions Ltd.
 * Copyright (C) 2011 ARM Ltd.
 * Author: Catalin Marinas <catalin.marinas@arm.com>
 *   based on arch/arm/mm/proc-v7-2level.S
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#define TTB_IRGN_NC	(0 << 8)
#define TTB_IRGN_WBWA	(1 << 8)
#define TTB_IRGN_WT	(2 << 8)
#define TTB_IRGN_WB	(3 << 8)
#define TTB_RGN_NC	(0 << 10)
#define TTB_RGN_OC_WBWA	(1 << 10)
#define TTB_RGN_OC_WT	(2 << 10)
#define TTB_RGN_OC_WB	(3 << 10)
#define TTB_S		(3 << 12)
#define TTB_EAE		(1 << 31)

/* PTWs cacheable, inner WB not shareable, outer WB not shareable */
#define TTB_FLAGS_UP	(TTB_IRGN_WB|TTB_RGN_OC_WB)
#define PMD_FLAGS_UP	(PMD_SECT_WB)

/* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */
#define TTB_FLAGS_SMP	(TTB_IRGN_WBWA|TTB_S|TTB_RGN_OC_WBWA)
#define PMD_FLAGS_SMP	(PMD_SECT_WBWA|PMD_SECT_S)

#ifndef __ARMEB__
#  define rpgdl	r0
#  define rpgdh	r1
#else
#  define rpgdl	r1
#  define rpgdh	r0
#endif

/*
 * cpu_v7_switch_mm(pgd_phys, tsk)
 *
 * Set the translation table base pointer to be pgd_phys (physical address of
 * the new TTB).
 */
ENTRY(cpu_v7_switch_mm)
#ifdef CONFIG_MMU
	mmid	r2, r2
	asid	r2, r2
	orr	rpgdh, rpgdh, r2, lsl #(48 - 32)	@ upper 32-bits of pgd
	mcrr	p15, 0, rpgdl, rpgdh, c2		@ set TTB 0
	isb
#endif
	mov	pc, lr
ENDPROC(cpu_v7_switch_mm)

/*
 * cpu_v7_set_pte_ext(ptep, pte)
 *
 * Set a level 2 translation table entry.
 * - ptep - pointer to level 3 translation table entry
 * - pte - PTE value to store (64-bit in r2 and r3)
 */
ENTRY(cpu_v7_set_pte_ext)
#ifdef CONFIG_MMU
	tst	r2, #L_PTE_VALID
	beq	1f
	tst	r3, #1 << (57 - 32)		@ L_PTE_NONE
	bicne	r2, #L_PTE_VALID
	bne	1f
	tst	r3, #1 << (55 - 32)		@ L_PTE_DIRTY
	orreq	r2, #L_PTE_RDONLY
1:	strd	r2, r3, [r0]
	ALT_SMP(W(nop))
	ALT_UP (mcr	p15, 0, r0, c7, c10, 1)		@ flush_pte
#endif
	mov	pc, lr
ENDPROC(cpu_v7_set_pte_ext)

	/*
	 * Memory region attributes for LPAE (defined in pgtable-3level.h):
	 *
	 *   n = AttrIndx[2:0]
	 *
	 *			n	MAIR
	 *   UNCACHED		000	00000000
	 *   BUFFERABLE		001	01000100
	 *   DEV_WC		001	01000100
	 *   WRITETHROUGH	010	10101010
	 *   WRITEBACK		011	11101110
	 *   DEV_CACHED		011	11101110
	 *   DEV_SHARED		100	00000100
	 *   DEV_NONSHARED	100	00000100
	 *   unused		101
	 *   unused		110
	 *   WRITEALLOC		111	11111111
	 */
.equ	PRRR,	0xeeaa4400			@ MAIR0
.equ	NMRR,	0xff000004			@ MAIR1

	/*
	 * Macro for setting up the TTBRx and TTBCR registers.
	 * - \ttbr1 updated.
	 */
	.macro	v7_ttb_setup, zero, ttbr0, ttbr1, tmp
	ldr	\tmp, =swapper_pg_dir		@ swapper_pg_dir virtual address
	mov	\tmp, \tmp, lsr #ARCH_PGD_SHIFT
	cmp	\ttbr1, \tmp			@ PHYS_OFFSET > PAGE_OFFSET?
	mrc	p15, 0, \tmp, c2, c0, 2		@ TTB control register
	orr	\tmp, \tmp, #TTB_EAE
	ALT_SMP(orr	\tmp, \tmp, #TTB_FLAGS_SMP)
	ALT_UP(orr	\tmp, \tmp, #TTB_FLAGS_UP)
	ALT_SMP(orr	\tmp, \tmp, #TTB_FLAGS_SMP << 16)
	ALT_UP(orr	\tmp, \tmp, #TTB_FLAGS_UP << 16)
	/*
	 * Only use split TTBRs if PHYS_OFFSET <= PAGE_OFFSET (cmp above),
	 * otherwise booting secondary CPUs would end up using TTBR1 for the
	 * identity mapping set up in TTBR0.
	 */
	orrls	\tmp, \tmp, #TTBR1_SIZE				@ TTBCR.T1SZ
	mcr	p15, 0, \tmp, c2, c0, 2				@ TTBCR
	mov	\tmp, \ttbr1, lsr #(32 - ARCH_PGD_SHIFT)	@ upper bits
	mov	\ttbr1, \ttbr1, lsl #ARCH_PGD_SHIFT		@ lower bits
	addls	\ttbr1, \ttbr1, #TTBR1_OFFSET
	mcrr	p15, 1, \ttbr1, \zero, c2			@ load TTBR1
	mov	\tmp, \ttbr0, lsr #(32 - ARCH_PGD_SHIFT)	@ upper bits
	mov	\ttbr0, \ttbr0, lsl #ARCH_PGD_SHIFT		@ lower bits
	mcrr	p15, 0, \ttbr0, \zero, c2			@ load TTBR0
	mcrr	p15, 1, \ttbr1, \zero, c2			@ load TTBR1
	mcrr	p15, 0, \ttbr0, \zero, c2			@ load TTBR0
	.endm

	/*
	 *   AT
	 *  TFR   EV X F   IHD LR    S
	 * .EEE ..EE PUI. .TAT 4RVI ZWRS BLDP WCAM
	 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
	 *   11    0 110    1  0011 1100 .111 1101 < we want
	 */
	.align	2
	.type	v7_crval, #object
v7_crval:
	crval	clear=0x0120c302, mmuset=0x30c23c7d, ucset=0x00c01c7c
OpenPOWER on IntegriCloud