aboutsummaryrefslogtreecommitdiff
path: root/arch/unicore32/mm/proc-macros.S
blob: 51560d68c894d2bc5863cbd0ff99ab9ff637b4ee (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
/*
 * linux/arch/unicore32/mm/proc-macros.S
 *
 * Code specific to PKUnity SoC and UniCore ISA
 *
 * Copyright (C) 2001-2010 GUAN Xue-tao
 *
 * 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.
 *
 * We need constants.h for:
 *  VMA_VM_MM
 *  VMA_VM_FLAGS
 *  VM_EXEC
 */
#include <generated/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/memory.h>

/*
 * the cache line sizes of the I and D cache are the same
 */
#define CACHE_LINESIZE	32

/*
 * This is the maximum size of an area which will be invalidated
 * using the single invalidate entry instructions.  Anything larger
 * than this, and we go for the whole cache.
 *
 * This value should be chosen such that we choose the cheapest
 * alternative.
 */
#ifdef CONFIG_CPU_UCV2
#define MAX_AREA_SIZE	0x800		/* 64 cache line */
#endif

/*
 * vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
 */
	.macro	vma_vm_mm, rd, rn
	ldw	\rd, [\rn+], #VMA_VM_MM
	.endm

/*
 * vma_vm_flags - get vma->vm_flags
 */
	.macro	vma_vm_flags, rd, rn
	ldw	\rd, [\rn+], #VMA_VM_FLAGS
	.endm

	.macro	tsk_mm, rd, rn
	ldw	\rd, [\rn+], #TI_TASK
	ldw	\rd, [\rd+], #TSK_ACTIVE_MM
	.endm

/*
 * act_mm - get current->active_mm
 */
	.macro	act_mm, rd
	andn	\rd, sp, #8128
	andn	\rd, \rd, #63
	ldw	\rd, [\rd+], #TI_TASK
	ldw	\rd, [\rd+], #TSK_ACTIVE_MM
	.endm

/*
 * mmid - get context id from mm pointer (mm->context.id)
 */
	.macro	mmid, rd, rn
	ldw	\rd, [\rn+], #MM_CONTEXT_ID
	.endm

/*
 * mask_asid - mask the ASID from the context ID
 */
	.macro	asid, rd, rn
	and	\rd, \rn, #255
	.endm

	.macro	crval, clear, mmuset, ucset
	.word	\clear
	.word	\mmuset
	.endm

#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
/*
 * va2pa va, pa, tbl, msk, off, err
 *	This macro is used to translate virtual address to its physical address.
 *
 *	va: virtual address
 *	pa: physical address, result is stored in this register
 *	tbl, msk, off:	temp registers, will be destroyed
 *	err: jump to error label if the physical address not exist
 * NOTE: all regs must be different
 */
	.macro	va2pa, va, pa, tbl, msk, off, err=990f
	movc	\pa, p0.c2, #0
	mov	\off, \va >> #22		@ off <- index of 1st page table
	adr	\tbl, 910f			@ tbl <- table of 1st page table
900:						@ ---- handle 1, 2 page table
	add	\pa, \pa, #PAGE_OFFSET		@ pa <- virt addr of page table
	ldw	\pa, [\pa+], \off << #2		@ pa <- the content of pt
	cand.a	\pa, #4				@ test exist bit
	beq	\err				@ if not exist
	and	\off, \pa, #3			@ off <- the last 2 bits
	add	\tbl, \tbl, \off << #3		@ cmove table pointer
	ldw	\msk, [\tbl+], #0		@ get the mask
	ldw	pc, [\tbl+], #4
930:						@ ---- handle 2nd page table
	and	\pa, \pa, \msk			@ pa <- phys addr of 2nd pt
	mov	\off, \va << #10
	cntlo	\tbl, \msk			@ use tbl as temp reg
	mov	\off, \off >> \tbl
	mov	\off, \off >> #2		@ off <- index of 2nd pt
	adr	\tbl, 920f			@ tbl <- table of 2nd pt
	b	900b
910:						@ 1st level page table
	.word	0xfffff000, 930b		@ second level page table
	.word	0xfffffc00, 930b		@ second level large page table
	.word	0x00000000, \err		@ invalid
	.word	0xffc00000, 980f		@ super page

920:						@ 2nd level page table
	.word	0xfffff000, 980f		@ page
	.word	0xffffc000, 980f		@ middle page
	.word	0xffff0000, 980f		@ large page
	.word	0x00000000, \err		@ invalid
980:
	andn	\tbl, \va, \msk
	and	\pa, \pa, \msk
	or	\pa, \pa, \tbl
990:
	.endm
#endif

	.macro dcacheline_flush, addr, t1, t2
	mov	\t1, \addr << #20
	ldw	\t2, =_stext			@ _stext must ALIGN(4096)
	add	\t2, \t2, \t1 >> #20
	ldw	\t1, [\t2+], #0x0000
	ldw	\t1, [\t2+], #0x1000
	ldw	\t1, [\t2+], #0x2000
	ldw	\t1, [\t2+], #0x3000
	.endm