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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> | |
39 | ||
40 | /* | |
41 | * Interrupt configuring macros. | |
42 | */ | |
43 | ||
44 | extern unsigned long irq_flags; | |
45 | ||
46 | #define local_irq_enable() do { \ | |
47 | __asm__ __volatile__ ( \ | |
48 | "sti %0;" \ | |
49 | ::"d"(irq_flags)); \ | |
50 | } while (0) | |
51 | ||
52 | #define local_irq_disable() do { \ | |
53 | int _tmp_dummy; \ | |
54 | __asm__ __volatile__ ( \ | |
55 | "cli %0;" \ | |
56 | :"=d" (_tmp_dummy):); \ | |
57 | } while (0) | |
58 | ||
59 | #if defined(ANOMALY_05000244) && defined (CONFIG_BLKFIN_CACHE) | |
60 | #define idle_with_irq_disabled() do { \ | |
61 | __asm__ __volatile__ ( \ | |
62 | "nop; nop;\n" \ | |
63 | ".align 8;\n" \ | |
64 | "sti %0; idle;\n" \ | |
65 | ::"d" (irq_flags)); \ | |
66 | } while (0) | |
67 | #else | |
68 | #define idle_with_irq_disabled() do { \ | |
69 | __asm__ __volatile__ ( \ | |
70 | ".align 8;\n" \ | |
71 | "sti %0; idle;\n" \ | |
72 | ::"d" (irq_flags)); \ | |
73 | } while (0) | |
74 | #endif | |
75 | ||
76 | #ifdef CONFIG_DEBUG_HWERR | |
77 | #define __save_and_cli(x) do { \ | |
78 | __asm__ __volatile__ ( \ | |
79 | "cli %0;\n\tsti %1;" \ | |
80 | :"=&d"(x): "d" (0x3F)); \ | |
81 | } while (0) | |
82 | #else | |
83 | #define __save_and_cli(x) do { \ | |
84 | __asm__ __volatile__ ( \ | |
85 | "cli %0;" \ | |
86 | :"=&d"(x):); \ | |
87 | } while (0) | |
88 | #endif | |
89 | ||
90 | #define local_save_flags(x) asm volatile ("cli %0;" \ | |
91 | "sti %0;" \ | |
92 | :"=d"(x):); | |
93 | ||
94 | #ifdef CONFIG_DEBUG_HWERR | |
95 | #define irqs_enabled_from_flags(x) (((x) & ~0x3f) != 0) | |
96 | #else | |
97 | #define irqs_enabled_from_flags(x) ((x) != 0x1f) | |
98 | #endif | |
99 | ||
100 | #define local_irq_restore(x) do { \ | |
101 | if (irqs_enabled_from_flags(x)) \ | |
102 | local_irq_enable (); \ | |
103 | } while (0) | |
104 | ||
105 | /* For spinlocks etc */ | |
106 | #define local_irq_save(x) __save_and_cli(x) | |
107 | ||
108 | #define irqs_disabled() \ | |
109 | ({ \ | |
110 | unsigned long flags; \ | |
111 | local_save_flags(flags); \ | |
112 | !irqs_enabled_from_flags(flags); \ | |
113 | }) | |
114 | ||
115 | /* | |
116 | * Force strict CPU ordering. | |
117 | */ | |
118 | #define nop() asm volatile ("nop;\n\t"::) | |
119 | #define mb() asm volatile ("" : : :"memory") | |
120 | #define rmb() asm volatile ("" : : :"memory") | |
121 | #define wmb() asm volatile ("" : : :"memory") | |
122 | #define set_rmb(var, value) do { (void) xchg(&var, value); } while (0) | |
123 | #define set_mb(var, value) set_rmb(var, value) | |
124 | #define set_wmb(var, value) do { var = value; wmb(); } while (0) | |
125 | ||
126 | #define read_barrier_depends() do { } while(0) | |
127 | ||
128 | #ifdef CONFIG_SMP | |
129 | #define smp_mb() mb() | |
130 | #define smp_rmb() rmb() | |
131 | #define smp_wmb() wmb() | |
132 | #define smp_read_barrier_depends() read_barrier_depends() | |
133 | #else | |
134 | #define smp_mb() barrier() | |
135 | #define smp_rmb() barrier() | |
136 | #define smp_wmb() barrier() | |
137 | #define smp_read_barrier_depends() do { } while(0) | |
138 | #endif | |
139 | ||
140 | #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) | |
1394f032 BW |
141 | |
142 | struct __xchg_dummy { | |
143 | unsigned long a[100]; | |
144 | }; | |
145 | #define __xg(x) ((volatile struct __xchg_dummy *)(x)) | |
146 | ||
147 | static inline unsigned long __xchg(unsigned long x, volatile void *ptr, | |
148 | int size) | |
149 | { | |
150 | unsigned long tmp = 0; | |
151 | unsigned long flags = 0; | |
152 | ||
153 | local_irq_save(flags); | |
154 | ||
155 | switch (size) { | |
156 | case 1: | |
157 | __asm__ __volatile__ | |
158 | ("%0 = b%2 (z);\n\t" | |
159 | "b%2 = %1;\n\t" | |
160 | : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); | |
161 | break; | |
162 | case 2: | |
163 | __asm__ __volatile__ | |
164 | ("%0 = w%2 (z);\n\t" | |
165 | "w%2 = %1;\n\t" | |
166 | : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); | |
167 | break; | |
168 | case 4: | |
169 | __asm__ __volatile__ | |
170 | ("%0 = %2;\n\t" | |
171 | "%2 = %1;\n\t" | |
172 | : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); | |
173 | break; | |
174 | } | |
175 | local_irq_restore(flags); | |
176 | return tmp; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Atomic compare and exchange. Compare OLD with MEM, if identical, | |
181 | * store NEW in MEM. Return the initial value in MEM. Success is | |
182 | * indicated by comparing RETURN with OLD. | |
183 | */ | |
184 | static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, | |
185 | unsigned long new, int size) | |
186 | { | |
187 | unsigned long tmp = 0; | |
188 | unsigned long flags = 0; | |
189 | ||
190 | local_irq_save(flags); | |
191 | ||
192 | switch (size) { | |
193 | case 1: | |
194 | __asm__ __volatile__ | |
195 | ("%0 = b%3 (z);\n\t" | |
196 | "CC = %1 == %0;\n\t" | |
197 | "IF !CC JUMP 1f;\n\t" | |
198 | "b%3 = %2;\n\t" | |
199 | "1:\n\t" | |
200 | : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory"); | |
201 | break; | |
202 | case 2: | |
203 | __asm__ __volatile__ | |
204 | ("%0 = w%3 (z);\n\t" | |
205 | "CC = %1 == %0;\n\t" | |
206 | "IF !CC JUMP 1f;\n\t" | |
207 | "w%3 = %2;\n\t" | |
208 | "1:\n\t" | |
209 | : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory"); | |
210 | break; | |
211 | case 4: | |
212 | __asm__ __volatile__ | |
213 | ("%0 = %3;\n\t" | |
214 | "CC = %1 == %0;\n\t" | |
215 | "IF !CC JUMP 1f;\n\t" | |
216 | "%3 = %2;\n\t" | |
217 | "1:\n\t" | |
218 | : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory"); | |
219 | break; | |
220 | } | |
221 | local_irq_restore(flags); | |
222 | return tmp; | |
223 | } | |
224 | ||
225 | #define cmpxchg(ptr,o,n)\ | |
226 | ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\ | |
227 | (unsigned long)(n),sizeof(*(ptr)))) | |
228 | ||
229 | #define prepare_to_switch() do { } while(0) | |
230 | ||
231 | /* | |
232 | * switch_to(n) should switch tasks to task ptr, first checking that | |
233 | * ptr isn't the current task, in which case it does nothing. | |
234 | */ | |
235 | ||
236 | #include <asm/blackfin.h> | |
237 | ||
238 | asmlinkage struct task_struct *resume(struct task_struct *prev, struct task_struct *next); | |
239 | ||
240 | #define switch_to(prev,next,last) \ | |
241 | do { \ | |
f7e4217b | 242 | memcpy (&task_thread_info(prev)->l1_task_info, L1_SCRATCH_TASK_INFO, \ |
1394f032 | 243 | sizeof *L1_SCRATCH_TASK_INFO); \ |
f7e4217b | 244 | memcpy (L1_SCRATCH_TASK_INFO, &task_thread_info(next)->l1_task_info, \ |
1394f032 BW |
245 | sizeof *L1_SCRATCH_TASK_INFO); \ |
246 | (last) = resume (prev, next); \ | |
247 | } while (0) | |
248 | ||
249 | #endif /* _BLACKFIN_SYSTEM_H */ |