aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mm/proc-arm720.S
blob: a13e0184d343dadb538cd535e6e50e37e220ebf2 (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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
/*
 *  linux/arch/arm/mm/proc-arm720.S: MMU functions for ARM720
 *
 *  Copyright (C) 2000 Steve Hill (sjhill@cotw.com)
 *                     Rob Scott (rscott@mtrob.fdns.net)
 *  Copyright (C) 2000 ARM Limited, Deep Blue Solutions Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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
 *
 *
 * These are the low level assembler for performing cache and TLB
 * functions on the ARM720T.  The ARM720T has a writethrough IDC
 * cache, so we don't need to clean it.
 *
 *  Changelog:
 *   05-09-2000 SJH	Created by moving 720 specific functions
 *			out of 'proc-arm6,7.S' per RMK discussion
 *   07-25-2000 SJH	Added idle function.
 *   08-25-2000	DBS	Updated for integration of ARM Ltd version.
 */
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/pgtable.h>
#include <asm/procinfo.h>
#include <asm/ptrace.h>
#include <asm/hardware.h>

/*
 * Function: arm720_proc_init (void)
 *	   : arm720_proc_fin (void)
 *
 * Notes   : This processor does not require these
 */
ENTRY(cpu_arm720_dcache_clean_area)
ENTRY(cpu_arm720_proc_init)
		mov	pc, lr

ENTRY(cpu_arm720_proc_fin)
		stmfd	sp!, {lr}
		mov	ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
		msr	cpsr_c, ip
		mrc	p15, 0, r0, c1, c0, 0
		bic	r0, r0, #0x1000			@ ...i............
		bic	r0, r0, #0x000e			@ ............wca.
		mcr	p15, 0, r0, c1, c0, 0		@ disable caches
		mcr	p15, 0, r1, c7, c7, 0		@ invalidate cache
		ldmfd	sp!, {pc}

/*
 * Function: arm720_proc_do_idle(void)
 * Params  : r0 = unused
 * Purpose : put the processer in proper idle mode
 */
ENTRY(cpu_arm720_do_idle)
		mov	pc, lr

/*
 * Function: arm720_switch_mm(unsigned long pgd_phys)
 * Params  : pgd_phys	Physical address of page table
 * Purpose : Perform a task switch, saving the old process' state and restoring
 *	     the new.
 */
ENTRY(cpu_arm720_switch_mm)
		mov	r1, #0
		mcr	p15, 0, r1, c7, c7, 0		@ invalidate cache
		mcr	p15, 0, r0, c2, c0, 0		@ update page table ptr
		mcr	p15, 0, r1, c8, c7, 0		@ flush TLB (v4)
		mov	pc, lr

/*
 * Function: arm720_set_pte(pte_t *ptep, pte_t pte)
 * Params  : r0 = Address to set
 *	   : r1 = value to set
 * Purpose : Set a PTE and flush it out of any WB cache
 */
		.align	5
ENTRY(cpu_arm720_set_pte)
		str	r1, [r0], #-2048		@ linux version

		eor	r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY

		bic	r2, r1, #PTE_SMALL_AP_MASK
		bic	r2, r2, #PTE_TYPE_MASK
		orr	r2, r2, #PTE_TYPE_SMALL

		tst	r1, #L_PTE_USER			@ User?
		orrne	r2, r2, #PTE_SMALL_AP_URO_SRW

		tst	r1, #L_PTE_WRITE | L_PTE_DIRTY	@ Write and Dirty?
		orreq	r2, r2, #PTE_SMALL_AP_UNO_SRW

		tst	r1, #L_PTE_PRESENT | L_PTE_YOUNG	@ Present and Young
		movne	r2, #0

		str	r2, [r0]			@ hardware version
		mov	pc, lr

/*
 * Function: arm720_reset
 * Params  : r0 = address to jump to
 * Notes   : This sets up everything for a reset
 */
ENTRY(cpu_arm720_reset)
		mov	ip, #0
		mcr	p15, 0, ip, c7, c7, 0		@ invalidate cache
		mcr	p15, 0, ip, c8, c7, 0		@ flush TLB (v4)
		mrc	p15, 0, ip, c1, c0, 0		@ get ctrl register
		bic	ip, ip, #0x000f			@ ............wcam
		bic	ip, ip, #0x2100			@ ..v....s........
		mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
		mov	pc, r0

	__INIT

	.type	__arm710_setup, #function
__arm710_setup:
	mov	r0, #0
	mcr	p15, 0, r0, c7, c7, 0		@ invalidate caches
	mcr	p15, 0, r0, c8, c7, 0		@ flush TLB (v4)
	mrc	p15, 0, r0, c1, c0		@ get control register
	ldr	r5, arm710_cr1_clear
	bic	r0, r0, r5
	ldr	r5, arm710_cr1_set
	orr	r0, r0, r5
	mov	pc, lr				@ __ret (head.S)
	.size	__arm710_setup, . - __arm710_setup

	/*
	 *  R
	 * .RVI ZFRS BLDP WCAM
	 * .... 0001 ..11 1101
	 * 
	 */
	.type	arm710_cr1_clear, #object
	.type	arm710_cr1_set, #object
arm710_cr1_clear:
	.word	0x0f3f
arm710_cr1_set:
	.word	0x013d

	.type	__arm720_setup, #function
__arm720_setup:
	mov	r0, #0
	mcr	p15, 0, r0, c7, c7, 0		@ invalidate caches
	mcr	p15, 0, r0, c8, c7, 0		@ flush TLB (v4)
	mrc	p15, 0, r0, c1, c0		@ get control register
	ldr	r5, arm720_cr1_clear
	bic	r0, r0, r5
	ldr	r5, arm720_cr1_set
	orr	r0, r0, r5
	mov	pc, lr				@ __ret (head.S)
	.size	__arm720_setup, . - __arm720_setup

	/*
	 *  R
	 * .RVI ZFRS BLDP WCAM
	 * ..1. 1001 ..11 1101
	 * 
	 */
	.type	arm720_cr1_clear, #object
	.type	arm720_cr1_set, #object
arm720_cr1_clear:
	.word	0x2f3f
arm720_cr1_set:
	.word	0x213d

		__INITDATA

/*
 * Purpose : Function pointers used to access above functions - all calls
 *	     come through these
 */
		.type	arm720_processor_functions, #object
ENTRY(arm720_processor_functions)
		.word	v4t_late_abort
		.word	cpu_arm720_proc_init
		.word	cpu_arm720_proc_fin
		.word	cpu_arm720_reset
		.word	cpu_arm720_do_idle
		.word	cpu_arm720_dcache_clean_area
		.word	cpu_arm720_switch_mm
		.word	cpu_arm720_set_pte
		.size	arm720_processor_functions, . - arm720_processor_functions

		.section ".rodata"

		.type	cpu_arch_name, #object
cpu_arch_name:	.asciz	"armv4t"
		.size	cpu_arch_name, . - cpu_arch_name

		.type	cpu_elf_name, #object
cpu_elf_name:	.asciz	"v4"
		.size	cpu_elf_name, . - cpu_elf_name

		.type	cpu_arm710_name, #object
cpu_arm710_name:
		.asciz	"ARM710T"
		.size	cpu_arm710_name, . - cpu_arm710_name

		.type	cpu_arm720_name, #object
cpu_arm720_name:
		.asciz	"ARM720T"
		.size	cpu_arm720_name, . - cpu_arm720_name

		.align

/*
 * See linux/include/asm-arm/procinfo.h for a definition of this structure.
 */
	
		.section ".proc.info.init", #alloc, #execinstr

		.type	__arm710_proc_info, #object
__arm710_proc_info:
		.long	0x41807100				@ cpu_val
		.long	0xffffff00				@ cpu_mask
		.long   PMD_TYPE_SECT | \
			PMD_SECT_BUFFERABLE | \
			PMD_SECT_CACHEABLE | \
			PMD_BIT4 | \
			PMD_SECT_AP_WRITE | \
			PMD_SECT_AP_READ
		b	__arm710_setup				@ cpu_flush
		.long	cpu_arch_name				@ arch_name
		.long	cpu_elf_name				@ elf_name
		.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB	@ elf_hwcap
		.long	cpu_arm710_name				@ name
		.long	arm720_processor_functions
		.long	v4_tlb_fns
		.long	v4wt_user_fns
		.long	v4_cache_fns
		.size	__arm710_proc_info, . - __arm710_proc_info

		.type	__arm720_proc_info, #object
__arm720_proc_info:
		.long	0x41807200				@ cpu_val
		.long	0xffffff00				@ cpu_mask
		.long   PMD_TYPE_SECT | \
			PMD_SECT_BUFFERABLE | \
			PMD_SECT_CACHEABLE | \
			PMD_BIT4 | \
			PMD_SECT_AP_WRITE | \
			PMD_SECT_AP_READ
		b	__arm720_setup				@ cpu_flush
		.long	cpu_arch_name				@ arch_name
		.long	cpu_elf_name				@ elf_name
		.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB	@ elf_hwcap
		.long	cpu_arm720_name				@ name
		.long	arm720_processor_functions
		.long	v4_tlb_fns
		.long	v4wt_user_fns
		.long	v4_cache_fns
		.size	__arm720_proc_info, . - __arm720_proc_info