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1394f032 BW |
1 | /* |
2 | * File: include/asm/system.h | |
3 | * Based on: | |
4 | * Author: Tony Kou (tonyko@lineo.ca) | |
5 | * Copyright (c) 2002 Arcturus Networks Inc. | |
6 | * (www.arcturusnetworks.com) | |
7 | * Copyright (c) 2003 Metrowerks (www.metrowerks.com) | |
8 | * Copyright (c) 2004 Analog Device Inc. | |
9 | * Created: 25Jan2001 - Tony Kou | |
10 | * Description: system.h include file | |
11 | * | |
12 | * Modified: 22Sep2006 - Robin Getz | |
13 | * - move include blackfin.h down, so I can get access to | |
14 | * irq functions in other include files. | |
15 | * | |
16 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation; either version 2, or (at your option) | |
21 | * any later version. | |
22 | * | |
23 | * This program is distributed in the hope that it will be useful, | |
24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26 | * GNU General Public License for more details. | |
27 | * | |
28 | * You should have received a copy of the GNU General Public License | |
29 | * along with this program; see the file COPYING. | |
30 | * If not, write to the Free Software Foundation, | |
31 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
32 | */ | |
33 | ||
34 | #ifndef _BLACKFIN_SYSTEM_H | |
35 | #define _BLACKFIN_SYSTEM_H | |
36 | ||
37 | #include <linux/linkage.h> | |
38 | #include <linux/compiler.h> | |
1aafd909 | 39 | #include <asm/mach/anomaly.h> |
1394f032 BW |
40 | |
41 | /* | |
42 | * Interrupt configuring macros. | |
43 | */ | |
44 | ||
45 | extern unsigned long irq_flags; | |
46 | ||
1aafd909 MF |
47 | #define local_irq_enable() \ |
48 | __asm__ __volatile__( \ | |
49 | "sti %0;" \ | |
50 | : \ | |
51 | : "d" (irq_flags) \ | |
52 | ) | |
53 | ||
54 | #define local_irq_disable() \ | |
55 | do { \ | |
56 | int __tmp_dummy; \ | |
57 | __asm__ __volatile__( \ | |
58 | "cli %0;" \ | |
59 | : "=d" (__tmp_dummy) \ | |
60 | ); \ | |
61 | } while (0) | |
62 | ||
3bebca2d | 63 | #if ANOMALY_05000244 && defined(CONFIG_BFIN_ICACHE) |
1aafd909 | 64 | # define NOP_PAD_ANOMALY_05000244 "nop; nop;" |
1394f032 | 65 | #else |
1aafd909 | 66 | # define NOP_PAD_ANOMALY_05000244 |
1394f032 BW |
67 | #endif |
68 | ||
1aafd909 MF |
69 | #define idle_with_irq_disabled() \ |
70 | __asm__ __volatile__( \ | |
71 | NOP_PAD_ANOMALY_05000244 \ | |
72 | ".align 8;" \ | |
73 | "sti %0;" \ | |
74 | "idle;" \ | |
75 | : \ | |
76 | : "d" (irq_flags) \ | |
77 | ) | |
78 | ||
1394f032 | 79 | #ifdef CONFIG_DEBUG_HWERR |
1aafd909 MF |
80 | # define __save_and_cli(x) \ |
81 | __asm__ __volatile__( \ | |
82 | "cli %0;" \ | |
83 | "sti %1;" \ | |
84 | : "=&d" (x) \ | |
85 | : "d" (0x3F) \ | |
86 | ) | |
1394f032 | 87 | #else |
1aafd909 MF |
88 | # define __save_and_cli(x) \ |
89 | __asm__ __volatile__( \ | |
90 | "cli %0;" \ | |
91 | : "=&d" (x) \ | |
92 | ) | |
1394f032 BW |
93 | #endif |
94 | ||
1aafd909 MF |
95 | #define local_save_flags(x) \ |
96 | __asm__ __volatile__( \ | |
97 | "cli %0;" \ | |
98 | "sti %0;" \ | |
99 | : "=d" (x) \ | |
100 | ) | |
1394f032 BW |
101 | |
102 | #ifdef CONFIG_DEBUG_HWERR | |
103 | #define irqs_enabled_from_flags(x) (((x) & ~0x3f) != 0) | |
104 | #else | |
105 | #define irqs_enabled_from_flags(x) ((x) != 0x1f) | |
106 | #endif | |
107 | ||
1aafd909 MF |
108 | #define local_irq_restore(x) \ |
109 | do { \ | |
110 | if (irqs_enabled_from_flags(x)) \ | |
111 | local_irq_enable(); \ | |
112 | } while (0) | |
1394f032 BW |
113 | |
114 | /* For spinlocks etc */ | |
115 | #define local_irq_save(x) __save_and_cli(x) | |
116 | ||
117 | #define irqs_disabled() \ | |
118 | ({ \ | |
119 | unsigned long flags; \ | |
120 | local_save_flags(flags); \ | |
121 | !irqs_enabled_from_flags(flags); \ | |
122 | }) | |
123 | ||
124 | /* | |
125 | * Force strict CPU ordering. | |
126 | */ | |
127 | #define nop() asm volatile ("nop;\n\t"::) | |
128 | #define mb() asm volatile ("" : : :"memory") | |
129 | #define rmb() asm volatile ("" : : :"memory") | |
130 | #define wmb() asm volatile ("" : : :"memory") | |
131 | #define set_rmb(var, value) do { (void) xchg(&var, value); } while (0) | |
132 | #define set_mb(var, value) set_rmb(var, value) | |
133 | #define set_wmb(var, value) do { var = value; wmb(); } while (0) | |
134 | ||
135 | #define read_barrier_depends() do { } while(0) | |
136 | ||
137 | #ifdef CONFIG_SMP | |
138 | #define smp_mb() mb() | |
139 | #define smp_rmb() rmb() | |
140 | #define smp_wmb() wmb() | |
141 | #define smp_read_barrier_depends() read_barrier_depends() | |
142 | #else | |
143 | #define smp_mb() barrier() | |
144 | #define smp_rmb() barrier() | |
145 | #define smp_wmb() barrier() | |
146 | #define smp_read_barrier_depends() do { } while(0) | |
147 | #endif | |
148 | ||
149 | #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) | |
1394f032 BW |
150 | |
151 | struct __xchg_dummy { | |
152 | unsigned long a[100]; | |
153 | }; | |
154 | #define __xg(x) ((volatile struct __xchg_dummy *)(x)) | |
155 | ||
156 | static inline unsigned long __xchg(unsigned long x, volatile void *ptr, | |
157 | int size) | |
158 | { | |
159 | unsigned long tmp = 0; | |
160 | unsigned long flags = 0; | |
161 | ||
162 | local_irq_save(flags); | |
163 | ||
164 | switch (size) { | |
165 | case 1: | |
166 | __asm__ __volatile__ | |
167 | ("%0 = b%2 (z);\n\t" | |
168 | "b%2 = %1;\n\t" | |
169 | : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); | |
170 | break; | |
171 | case 2: | |
172 | __asm__ __volatile__ | |
173 | ("%0 = w%2 (z);\n\t" | |
174 | "w%2 = %1;\n\t" | |
175 | : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); | |
176 | break; | |
177 | case 4: | |
178 | __asm__ __volatile__ | |
179 | ("%0 = %2;\n\t" | |
180 | "%2 = %1;\n\t" | |
181 | : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); | |
182 | break; | |
183 | } | |
184 | local_irq_restore(flags); | |
185 | return tmp; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Atomic compare and exchange. Compare OLD with MEM, if identical, | |
190 | * store NEW in MEM. Return the initial value in MEM. Success is | |
191 | * indicated by comparing RETURN with OLD. | |
192 | */ | |
193 | static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, | |
194 | unsigned long new, int size) | |
195 | { | |
196 | unsigned long tmp = 0; | |
197 | unsigned long flags = 0; | |
198 | ||
199 | local_irq_save(flags); | |
200 | ||
201 | switch (size) { | |
202 | case 1: | |
203 | __asm__ __volatile__ | |
204 | ("%0 = b%3 (z);\n\t" | |
205 | "CC = %1 == %0;\n\t" | |
206 | "IF !CC JUMP 1f;\n\t" | |
207 | "b%3 = %2;\n\t" | |
208 | "1:\n\t" | |
209 | : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory"); | |
210 | break; | |
211 | case 2: | |
212 | __asm__ __volatile__ | |
213 | ("%0 = w%3 (z);\n\t" | |
214 | "CC = %1 == %0;\n\t" | |
215 | "IF !CC JUMP 1f;\n\t" | |
216 | "w%3 = %2;\n\t" | |
217 | "1:\n\t" | |
218 | : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory"); | |
219 | break; | |
220 | case 4: | |
221 | __asm__ __volatile__ | |
222 | ("%0 = %3;\n\t" | |
223 | "CC = %1 == %0;\n\t" | |
224 | "IF !CC JUMP 1f;\n\t" | |
225 | "%3 = %2;\n\t" | |
226 | "1:\n\t" | |
227 | : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory"); | |
228 | break; | |
229 | } | |
230 | local_irq_restore(flags); | |
231 | return tmp; | |
232 | } | |
233 | ||
234 | #define cmpxchg(ptr,o,n)\ | |
235 | ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\ | |
236 | (unsigned long)(n),sizeof(*(ptr)))) | |
237 | ||
238 | #define prepare_to_switch() do { } while(0) | |
239 | ||
240 | /* | |
241 | * switch_to(n) should switch tasks to task ptr, first checking that | |
242 | * ptr isn't the current task, in which case it does nothing. | |
243 | */ | |
244 | ||
245 | #include <asm/blackfin.h> | |
246 | ||
247 | asmlinkage struct task_struct *resume(struct task_struct *prev, struct task_struct *next); | |
248 | ||
249 | #define switch_to(prev,next,last) \ | |
250 | do { \ | |
f7e4217b | 251 | memcpy (&task_thread_info(prev)->l1_task_info, L1_SCRATCH_TASK_INFO, \ |
1394f032 | 252 | sizeof *L1_SCRATCH_TASK_INFO); \ |
f7e4217b | 253 | memcpy (L1_SCRATCH_TASK_INFO, &task_thread_info(next)->l1_task_info, \ |
1394f032 BW |
254 | sizeof *L1_SCRATCH_TASK_INFO); \ |
255 | (last) = resume (prev, next); \ | |
256 | } while (0) | |
257 | ||
258 | #endif /* _BLACKFIN_SYSTEM_H */ |