Merge branch 'master' of /usr/src/ntfs-2.6/
[linux-2.6] / arch / arm / mm / proc-arm720.S
1 /*
2  *  linux/arch/arm/mm/proc-arm720.S: MMU functions for ARM720
3  *
4  *  Copyright (C) 2000 Steve Hill (sjhill@cotw.com)
5  *                     Rob Scott (rscott@mtrob.fdns.net)
6  *  Copyright (C) 2000 ARM Limited, Deep Blue Solutions Ltd.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
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  * These are the low level assembler for performing cache and TLB
24  * functions on the ARM720T.  The ARM720T has a writethrough IDC
25  * cache, so we don't need to clean it.
26  *
27  *  Changelog:
28  *   05-09-2000 SJH     Created by moving 720 specific functions
29  *                      out of 'proc-arm6,7.S' per RMK discussion
30  *   07-25-2000 SJH     Added idle function.
31  *   08-25-2000 DBS     Updated for integration of ARM Ltd version.
32  */
33 #include <linux/linkage.h>
34 #include <linux/init.h>
35 #include <asm/assembler.h>
36 #include <asm/asm-offsets.h>
37 #include <asm/pgtable.h>
38 #include <asm/procinfo.h>
39 #include <asm/ptrace.h>
40
41 /*
42  * Function: arm720_proc_init (void)
43  *         : arm720_proc_fin (void)
44  *
45  * Notes   : This processor does not require these
46  */
47 ENTRY(cpu_arm720_dcache_clean_area)
48 ENTRY(cpu_arm720_proc_init)
49                 mov     pc, lr
50
51 ENTRY(cpu_arm720_proc_fin)
52                 stmfd   sp!, {lr}
53                 mov     ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
54                 msr     cpsr_c, ip
55                 mrc     p15, 0, r0, c1, c0, 0
56                 bic     r0, r0, #0x1000                 @ ...i............
57                 bic     r0, r0, #0x000e                 @ ............wca.
58                 mcr     p15, 0, r0, c1, c0, 0           @ disable caches
59                 mcr     p15, 0, r1, c7, c7, 0           @ invalidate cache
60                 ldmfd   sp!, {pc}
61
62 /*
63  * Function: arm720_proc_do_idle(void)
64  * Params  : r0 = unused
65  * Purpose : put the processer in proper idle mode
66  */
67 ENTRY(cpu_arm720_do_idle)
68                 mov     pc, lr
69
70 /*
71  * Function: arm720_switch_mm(unsigned long pgd_phys)
72  * Params  : pgd_phys   Physical address of page table
73  * Purpose : Perform a task switch, saving the old process' state and restoring
74  *           the new.
75  */
76 ENTRY(cpu_arm720_switch_mm)
77                 mov     r1, #0
78                 mcr     p15, 0, r1, c7, c7, 0           @ invalidate cache
79                 mcr     p15, 0, r0, c2, c0, 0           @ update page table ptr
80                 mcr     p15, 0, r1, c8, c7, 0           @ flush TLB (v4)
81                 mov     pc, lr
82
83 /*
84  * Function: arm720_set_pte(pte_t *ptep, pte_t pte)
85  * Params  : r0 = Address to set
86  *         : r1 = value to set
87  * Purpose : Set a PTE and flush it out of any WB cache
88  */
89                 .align  5
90 ENTRY(cpu_arm720_set_pte)
91                 str     r1, [r0], #-2048                @ linux version
92
93                 eor     r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
94
95                 bic     r2, r1, #PTE_SMALL_AP_MASK
96                 bic     r2, r2, #PTE_TYPE_MASK
97                 orr     r2, r2, #PTE_TYPE_SMALL
98
99                 tst     r1, #L_PTE_USER                 @ User?
100                 orrne   r2, r2, #PTE_SMALL_AP_URO_SRW
101
102                 tst     r1, #L_PTE_WRITE | L_PTE_DIRTY  @ Write and Dirty?
103                 orreq   r2, r2, #PTE_SMALL_AP_UNO_SRW
104
105                 tst     r1, #L_PTE_PRESENT | L_PTE_YOUNG        @ Present and Young
106                 movne   r2, #0
107
108                 str     r2, [r0]                        @ hardware version
109                 mov     pc, lr
110
111 /*
112  * Function: arm720_reset
113  * Params  : r0 = address to jump to
114  * Notes   : This sets up everything for a reset
115  */
116 ENTRY(cpu_arm720_reset)
117                 mov     ip, #0
118                 mcr     p15, 0, ip, c7, c7, 0           @ invalidate cache
119                 mcr     p15, 0, ip, c8, c7, 0           @ flush TLB (v4)
120                 mrc     p15, 0, ip, c1, c0, 0           @ get ctrl register
121                 bic     ip, ip, #0x000f                 @ ............wcam
122                 bic     ip, ip, #0x2100                 @ ..v....s........
123                 mcr     p15, 0, ip, c1, c0, 0           @ ctrl register
124                 mov     pc, r0
125
126         __INIT
127
128         .type   __arm710_setup, #function
129 __arm710_setup:
130         mov     r0, #0
131         mcr     p15, 0, r0, c7, c7, 0           @ invalidate caches
132         mcr     p15, 0, r0, c8, c7, 0           @ flush TLB (v4)
133         mrc     p15, 0, r0, c1, c0              @ get control register
134         ldr     r5, arm710_cr1_clear
135         bic     r0, r0, r5
136         ldr     r5, arm710_cr1_set
137         orr     r0, r0, r5
138         mov     pc, lr                          @ __ret (head.S)
139         .size   __arm710_setup, . - __arm710_setup
140
141         /*
142          *  R
143          * .RVI ZFRS BLDP WCAM
144          * .... 0001 ..11 1101
145          * 
146          */
147         .type   arm710_cr1_clear, #object
148         .type   arm710_cr1_set, #object
149 arm710_cr1_clear:
150         .word   0x0f3f
151 arm710_cr1_set:
152         .word   0x013d
153
154         .type   __arm720_setup, #function
155 __arm720_setup:
156         mov     r0, #0
157         mcr     p15, 0, r0, c7, c7, 0           @ invalidate caches
158         mcr     p15, 0, r0, c8, c7, 0           @ flush TLB (v4)
159         mrc     p15, 0, r0, c1, c0              @ get control register
160         ldr     r5, arm720_cr1_clear
161         bic     r0, r0, r5
162         ldr     r5, arm720_cr1_set
163         orr     r0, r0, r5
164         mov     pc, lr                          @ __ret (head.S)
165         .size   __arm720_setup, . - __arm720_setup
166
167         /*
168          *  R
169          * .RVI ZFRS BLDP WCAM
170          * ..1. 1001 ..11 1101
171          * 
172          */
173         .type   arm720_cr1_clear, #object
174         .type   arm720_cr1_set, #object
175 arm720_cr1_clear:
176         .word   0x2f3f
177 arm720_cr1_set:
178         .word   0x213d
179
180                 __INITDATA
181
182 /*
183  * Purpose : Function pointers used to access above functions - all calls
184  *           come through these
185  */
186                 .type   arm720_processor_functions, #object
187 ENTRY(arm720_processor_functions)
188                 .word   v4t_late_abort
189                 .word   cpu_arm720_proc_init
190                 .word   cpu_arm720_proc_fin
191                 .word   cpu_arm720_reset
192                 .word   cpu_arm720_do_idle
193                 .word   cpu_arm720_dcache_clean_area
194                 .word   cpu_arm720_switch_mm
195                 .word   cpu_arm720_set_pte
196                 .size   arm720_processor_functions, . - arm720_processor_functions
197
198                 .section ".rodata"
199
200                 .type   cpu_arch_name, #object
201 cpu_arch_name:  .asciz  "armv4t"
202                 .size   cpu_arch_name, . - cpu_arch_name
203
204                 .type   cpu_elf_name, #object
205 cpu_elf_name:   .asciz  "v4"
206                 .size   cpu_elf_name, . - cpu_elf_name
207
208                 .type   cpu_arm710_name, #object
209 cpu_arm710_name:
210                 .asciz  "ARM710T"
211                 .size   cpu_arm710_name, . - cpu_arm710_name
212
213                 .type   cpu_arm720_name, #object
214 cpu_arm720_name:
215                 .asciz  "ARM720T"
216                 .size   cpu_arm720_name, . - cpu_arm720_name
217
218                 .align
219
220 /*
221  * See linux/include/asm-arm/procinfo.h for a definition of this structure.
222  */
223         
224                 .section ".proc.info.init", #alloc, #execinstr
225
226                 .type   __arm710_proc_info, #object
227 __arm710_proc_info:
228                 .long   0x41807100                              @ cpu_val
229                 .long   0xffffff00                              @ cpu_mask
230                 .long   PMD_TYPE_SECT | \
231                         PMD_SECT_BUFFERABLE | \
232                         PMD_SECT_CACHEABLE | \
233                         PMD_BIT4 | \
234                         PMD_SECT_AP_WRITE | \
235                         PMD_SECT_AP_READ
236                 b       __arm710_setup                          @ cpu_flush
237                 .long   cpu_arch_name                           @ arch_name
238                 .long   cpu_elf_name                            @ elf_name
239                 .long   HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB    @ elf_hwcap
240                 .long   cpu_arm710_name                         @ name
241                 .long   arm720_processor_functions
242                 .long   v4_tlb_fns
243                 .long   v4wt_user_fns
244                 .long   v4_cache_fns
245                 .size   __arm710_proc_info, . - __arm710_proc_info
246
247                 .type   __arm720_proc_info, #object
248 __arm720_proc_info:
249                 .long   0x41807200                              @ cpu_val
250                 .long   0xffffff00                              @ cpu_mask
251                 .long   PMD_TYPE_SECT | \
252                         PMD_SECT_BUFFERABLE | \
253                         PMD_SECT_CACHEABLE | \
254                         PMD_BIT4 | \
255                         PMD_SECT_AP_WRITE | \
256                         PMD_SECT_AP_READ
257                 b       __arm720_setup                          @ cpu_flush
258                 .long   cpu_arch_name                           @ arch_name
259                 .long   cpu_elf_name                            @ elf_name
260                 .long   HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB    @ elf_hwcap
261                 .long   cpu_arm720_name                         @ name
262                 .long   arm720_processor_functions
263                 .long   v4_tlb_fns
264                 .long   v4wt_user_fns
265                 .long   v4_cache_fns
266                 .size   __arm720_proc_info, . - __arm720_proc_info