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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 6cb142fa3b732a2cea257ca39ef4a7dbe81a32e1 / . / include / asm-blackfin / entry.h
blob: 607a5b8e98a43604ee813edfced3b2a8d98f6574 [file] [log] [blame]
Wolfgang Denk6cb142f2006-03-12 02:12:27 +0100[diff] [blame^]1/*
2 * U-boot - entry.h Routines for context saving and restoring
3 *
4 * Copyright (c) 2005 blackfin.uclinux.org
5 *
6 * See file CREDITS for list of people who contributed to this
7 * project.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 * MA 02111-1307 USA
23 */
24
25#ifndef __BLACKFIN_ENTRY_H
26#define __BLACKFIN_ENTRY_H
27
28#include <linux/config.h>
29#include <asm/setup.h>
30#include <asm/page.h>
31
32/*
33 * Stack layout in 'ret_from_exception':
34 *
35 */
36
37/*
38 * Register %p2 is now set to the current task throughout
39 * the whole kernel.
40 */
41
42#ifdef __ASSEMBLY__
43
44#define LFLUSH_I_AND_D 0x00000808
45#define LSIGTRAP 5
46
47/* process bits for task_struct.flags */
48#define PF_TRACESYS_OFF 3
49#define PF_TRACESYS_BIT 5
50#define PF_PTRACED_OFF 3
51#define PF_PTRACED_BIT 4
52#define PF_DTRACE_OFF 1
53#define PF_DTRACE_BIT 5
54
55#define NEW_PT_REGS
56
57#if defined(NEW_PT_REGS)
58
59#define SAVE_ALL_INT save_context_no_interrupts
60#define SAVE_ALL_SYS save_context_no_interrupts
61#define SAVE_CONTEXT save_context_with_interrupts
62
63#define RESTORE_ALL restore_context_no_interrupts
64#define RESTORE_ALL_SYS restore_context_no_interrupts
65#define RESTORE_CONTEXT restore_context_with_interrupts
66
67#else
68
69#define SAVE_ALL_INT save_all_int
70#define SAVE_ALL_SYS save_all_sys
71#define SAVE_CONTEXT save_context
72#define RESTORE_ALL restore_context
73#define RESTORE_CONTEXT restore_context
74
75#endif
76
77/*
78 * Code to save processor context.
79 * We even save the register which are preserved by a function call
80 * - r4, r5, r6, r7, p3, p4, p5
81 */
82.macro save_context_with_interrupts
83 [--sp] = R0;
84 [--sp] = ( R7:0, P5:0 );
85 [--sp] = fp;
86 [--sp] = usp;
87
88 [--sp] = i0;
89 [--sp] = i1;
90 [--sp] = i2;
91 [--sp] = i3;
92
93 [--sp] = m0;
94 [--sp] = m1;
95 [--sp] = m2;
96 [--sp] = m3;
97
98 [--sp] = l0;
99 [--sp] = l1;
100 [--sp] = l2;
101 [--sp] = l3;
102
103 [--sp] = b0;
104 [--sp] = b1;
105 [--sp] = b2;
106 [--sp] = b3;
107 [--sp] = a0.x;
108 [--sp] = a0.w;
109 [--sp] = a1.x;
110 [--sp] = a1.w;
111
112 [--sp] = LC0;
113 [--sp] = LC1;
114 [--sp] = LT0;
115 [--sp] = LT1;
116 [--sp] = LB0;
117 [--sp] = LB1;
118
119 [--sp] = ASTAT;
120
121 [--sp] = r0; /* Skip reserved */
122 [--sp] = RETS;
123 [--sp] = RETI;
124 [--sp] = RETX;
125 [--sp] = RETN;
126 [--sp] = RETE;
127 [--sp] = SEQSTAT;
128 [--sp] = SYSCFG;
129 [--sp] = r0; /* Skip IPEND as well. */
130.endm
131
132.macro save_context_no_interrupts
133 [--sp] = R0;
134 [--sp] = ( R7:0, P5:0 );
135 [--sp] = fp;
136 [--sp] = usp;
137
138 [--sp] = i0;
139 [--sp] = i1;
140 [--sp] = i2;
141 [--sp] = i3;
142
143 [--sp] = m0;
144 [--sp] = m1;
145 [--sp] = m2;
146 [--sp] = m3;
147
148 [--sp] = l0;
149 [--sp] = l1;
150 [--sp] = l2;
151 [--sp] = l3;
152
153 [--sp] = b0;
154 [--sp] = b1;
155 [--sp] = b2;
156 [--sp] = b3;
157 [--sp] = a0.x;
158 [--sp] = a0.w;
159 [--sp] = a1.x;
160 [--sp] = a1.w;
161
162 [--sp] = LC0;
163 [--sp] = LC1;
164 [--sp] = LT0;
165 [--sp] = LT1;
166 [--sp] = LB0;
167 [--sp] = LB1;
168
169 [--sp] = ASTAT;
170
171 [--sp] = r0; /* Skip reserved */
172 [--sp] = RETS;
173 r0 = RETI;
174 [--sp] = r0;
175 [--sp] = RETX;
176 [--sp] = RETN;
177 [--sp] = RETE;
178 [--sp] = SEQSTAT;
179 [--sp] = SYSCFG;
180 [--sp] = r0; /* Skip IPEND as well. */
181.endm
182
183.macro restore_context_no_interrupts
184 sp += 4;
185 SYSCFG = [sp++];
186 SEQSTAT = [sp++];
187 RETE = [sp++];
188 RETN = [sp++];
189 RETX = [sp++];
190 r0 = [sp++];
191 RETI = r0;
192 RETS = [sp++];
193
194 sp += 4;
195
196 ASTAT = [sp++];
197
198 LB1 = [sp++];
199 LB0 = [sp++];
200 LT1 = [sp++];
201 LT0 = [sp++];
202 LC1 = [sp++];
203 LC0 = [sp++];
204
205 a1.w = [sp++];
206 a1.x = [sp++];
207 a0.w = [sp++];
208 a0.x = [sp++];
209 b3 = [sp++];
210 b2 = [sp++];
211 b1 = [sp++];
212 b0 = [sp++];
213
214 l3 = [sp++];
215 l2 = [sp++];
216 l1 = [sp++];
217 l0 = [sp++];
218
219 m3 = [sp++];
220 m2 = [sp++];
221 m1 = [sp++];
222 m0 = [sp++];
223
224 i3 = [sp++];
225 i2 = [sp++];
226 i1 = [sp++];
227 i0 = [sp++];
228
229 sp += 4;
230 fp = [sp++];
231
232 ( R7 : 0, P5 : 0) = [ SP ++ ];
233 sp += 4;
234.endm
235
236.macro restore_context_with_interrupts
237 sp += 4;
238 SYSCFG = [sp++];
239 SEQSTAT = [sp++];
240 RETE = [sp++];
241 RETN = [sp++];
242 RETX = [sp++];
243 RETI = [sp++];
244 RETS = [sp++];
245
246 sp += 4;
247
248 ASTAT = [sp++];
249
250 LB1 = [sp++];
251 LB0 = [sp++];
252 LT1 = [sp++];
253 LT0 = [sp++];
254 LC1 = [sp++];
255 LC0 = [sp++];
256
257 a1.w = [sp++];
258 a1.x = [sp++];
259 a0.w = [sp++];
260 a0.x = [sp++];
261 b3 = [sp++];
262 b2 = [sp++];
263 b1 = [sp++];
264 b0 = [sp++];
265
266 l3 = [sp++];
267 l2 = [sp++];
268 l1 = [sp++];
269 l0 = [sp++];
270
271 m3 = [sp++];
272 m2 = [sp++];
273 m1 = [sp++];
274 m0 = [sp++];
275
276 i3 = [sp++];
277 i2 = [sp++];
278 i1 = [sp++];
279 i0 = [sp++];
280
281 sp += 4;
282 fp = [sp++];
283
284 ( R7 : 0, P5 : 0) = [ SP ++ ];
285 sp += 4;
286.endm
287
288#if !defined(NEW_PT_REGS)
289/*
290 * a -1 in the orig_r0 field signifies
291 * that the stack frame is NOT for syscall
292 */
293.macro save_all_int
294/* reserved and disable the single step of SYSCFG, by Steven Chen 03/07/10 */
295 [--sp] = r0;
296 r0.l = 0x30; /* Errata for BF533 */
297 r0.h = 0x0;
298 syscfg = r0; /* disable single step flag in SYSCFG */
299 r0 = [sp++];
300 [--sp] = syscfg; /* store SYSCFG */
301
302 [--sp] = r0; /* Reserved for IPEND */
303 [--sp] = fp;
304 [--sp] = usp;
305 [--sp] = r0;
306
307 [--sp] = r0;
308 r0 = [sp + 8];
309 [--sp] = a0.x;
310 [--sp] = a1.x;
311 [--sp] = a0.w;
312 [--sp] = a1.w;
313 [--sp] = rets;
314 [--sp] = astat;
315 [--sp] = seqstat;
316 [--sp] = retx; /* current pc when exception happens */
317 [--sp] = ( r7:5, p5:0 );
318 [--sp] = r1;
319 [--sp] = r2;
320 [--sp] = r4;
321 [--sp] = r3;
322.endm
323
324.macro save_all_sys
325 [--sp] = r0;
326 [--sp] = r0;
327 [--sp] = a0.x;
328 [--sp] = a1.x;
329 [--sp] = a0.w;
330 [--sp] = a1.w;
331 [--sp] = rets;
332 [--sp] = astat;
333 [--sp] = seqstat;
334 [--sp] = retx; /* current pc when exception happens */
335 [--sp] = ( r7:5, p5:0 );
336 [--sp] = r1;
337 [--sp] = r2;
338 [--sp] = r4;
339 [--sp] = r3;
340.endm
341
342.macro restore_all
343 r3 = [sp++];
344 r4 = [sp++];
345 r2 = [sp++];
346 r1 = [sp++];
347 ( r7:5, p5:0 ) = [sp++];
348 retx = [sp++];
349 seqstat = [sp++];
350 astat = [sp++];
351 rets = [sp++];
352 a1.w = [sp++];
353 a0.w = [sp++];
354 a1.x = [sp++];
355 a0.x = [sp++];
356 sp += 4; /* orig r0 */
357 r0 = [sp++];
358
359 sp += 4;
360 fp = [sp++];
361 sp +=4; /* Skip the IPEND */
362
363 syscfg = [sp++];
364
365.endm
366
367#endif
368
369#define STR(X) STR1(X)
370#define STR1(X) #X
371
372#if defined(NEW_PT_REGS)
373
374#define PT_OFF_ORIG_R0 208
375#define PT_OFF_SR 8
376
377#else
378
379#define PT_OFF_ORIG_R0 0x54
380#define PT_OFF_SR 0x38 /* seqstat in pt_regs */
381
382#endif
383#endif
384
385#endif