aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/kernel
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/Makefile4
-rw-r--r--arch/arm/kernel/apm.c187
-rw-r--r--arch/arm/kernel/asm-offsets.c1
-rw-r--r--arch/arm/kernel/ecard.c10
-rw-r--r--arch/arm/kernel/entry-armv.S9
-rw-r--r--arch/arm/kernel/head-nommu.S1
-rw-r--r--arch/arm/kernel/head.S1
-rw-r--r--arch/arm/kernel/irq.c8
-rw-r--r--arch/arm/kernel/iwmmxt-notifier.c63
-rw-r--r--arch/arm/kernel/process.c61
-rw-r--r--arch/arm/kernel/setup.c14
-rw-r--r--arch/arm/kernel/signal.c1
-rw-r--r--arch/arm/kernel/traps.c7
-rw-r--r--arch/arm/kernel/xscale-cp0.c179
14 files changed, 333 insertions, 213 deletions
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 1320a0efca73..ab06a86e85d5 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -24,7 +24,9 @@ obj-$(CONFIG_OABI_COMPAT) += sys_oabi-compat.o
24obj-$(CONFIG_CRUNCH) += crunch.o crunch-bits.o 24obj-$(CONFIG_CRUNCH) += crunch.o crunch-bits.o
25AFLAGS_crunch-bits.o := -Wa,-mcpu=ep9312 25AFLAGS_crunch-bits.o := -Wa,-mcpu=ep9312
26 26
27obj-$(CONFIG_IWMMXT) += iwmmxt.o iwmmxt-notifier.o 27obj-$(CONFIG_CPU_XSCALE) += xscale-cp0.o
28obj-$(CONFIG_CPU_XSC3) += xscale-cp0.o
29obj-$(CONFIG_IWMMXT) += iwmmxt.o
28AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt 30AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
29 31
30ifneq ($(CONFIG_ARCH_EBSA110),y) 32ifneq ($(CONFIG_ARCH_EBSA110),y)
diff --git a/arch/arm/kernel/apm.c b/arch/arm/kernel/apm.c
index ecf4f9472d94..a11fb9a40c04 100644
--- a/arch/arm/kernel/apm.c
+++ b/arch/arm/kernel/apm.c
@@ -12,7 +12,6 @@
12 */ 12 */
13#include <linux/module.h> 13#include <linux/module.h>
14#include <linux/poll.h> 14#include <linux/poll.h>
15#include <linux/timer.h>
16#include <linux/slab.h> 15#include <linux/slab.h>
17#include <linux/proc_fs.h> 16#include <linux/proc_fs.h>
18#include <linux/miscdevice.h> 17#include <linux/miscdevice.h>
@@ -26,6 +25,7 @@
26#include <linux/init.h> 25#include <linux/init.h>
27#include <linux/completion.h> 26#include <linux/completion.h>
28#include <linux/kthread.h> 27#include <linux/kthread.h>
28#include <linux/delay.h>
29 29
30#include <asm/apm.h> /* apm_power_info */ 30#include <asm/apm.h> /* apm_power_info */
31#include <asm/system.h> 31#include <asm/system.h>
@@ -71,7 +71,8 @@ struct apm_user {
71#define SUSPEND_PENDING 1 /* suspend pending read */ 71#define SUSPEND_PENDING 1 /* suspend pending read */
72#define SUSPEND_READ 2 /* suspend read, pending ack */ 72#define SUSPEND_READ 2 /* suspend read, pending ack */
73#define SUSPEND_ACKED 3 /* suspend acked */ 73#define SUSPEND_ACKED 3 /* suspend acked */
74#define SUSPEND_DONE 4 /* suspend completed */ 74#define SUSPEND_WAIT 4 /* waiting for suspend */
75#define SUSPEND_DONE 5 /* suspend completed */
75 76
76 struct apm_queue queue; 77 struct apm_queue queue;
77}; 78};
@@ -101,6 +102,7 @@ static DECLARE_WAIT_QUEUE_HEAD(kapmd_wait);
101static DEFINE_SPINLOCK(kapmd_queue_lock); 102static DEFINE_SPINLOCK(kapmd_queue_lock);
102static struct apm_queue kapmd_queue; 103static struct apm_queue kapmd_queue;
103 104
105static DEFINE_MUTEX(state_lock);
104 106
105static const char driver_version[] = "1.13"; /* no spaces */ 107static const char driver_version[] = "1.13"; /* no spaces */
106 108
@@ -148,38 +150,60 @@ static void queue_add_event(struct apm_queue *q, apm_event_t event)
148 q->events[q->event_head] = event; 150 q->events[q->event_head] = event;
149} 151}
150 152
151static void queue_event_one_user(struct apm_user *as, apm_event_t event) 153static void queue_event(apm_event_t event)
152{ 154{
153 if (as->suser && as->writer) { 155 struct apm_user *as;
154 switch (event) {
155 case APM_SYS_SUSPEND:
156 case APM_USER_SUSPEND:
157 /*
158 * If this user already has a suspend pending,
159 * don't queue another one.
160 */
161 if (as->suspend_state != SUSPEND_NONE)
162 return;
163 156
164 as->suspend_state = SUSPEND_PENDING; 157 down_read(&user_list_lock);
165 suspends_pending++; 158 list_for_each_entry(as, &apm_user_list, list) {
166 break; 159 if (as->reader)
167 } 160 queue_add_event(&as->queue, event);
168 } 161 }
169 queue_add_event(&as->queue, event); 162 up_read(&user_list_lock);
163 wake_up_interruptible(&apm_waitqueue);
170} 164}
171 165
172static void queue_event(apm_event_t event, struct apm_user *sender) 166/*
167 * queue_suspend_event - queue an APM suspend event.
168 *
169 * Check that we're in a state where we can suspend. If not,
170 * return -EBUSY. Otherwise, queue an event to all "writer"
171 * users. If there are no "writer" users, return '1' to
172 * indicate that we can immediately suspend.
173 */
174static int queue_suspend_event(apm_event_t event, struct apm_user *sender)
173{ 175{
174 struct apm_user *as; 176 struct apm_user *as;
177 int ret = 1;
175 178
179 mutex_lock(&state_lock);
176 down_read(&user_list_lock); 180 down_read(&user_list_lock);
181
182 /*
183 * If a thread is still processing, we can't suspend, so reject
184 * the request.
185 */
177 list_for_each_entry(as, &apm_user_list, list) { 186 list_for_each_entry(as, &apm_user_list, list) {
178 if (as != sender && as->reader) 187 if (as != sender && as->reader && as->writer && as->suser &&
179 queue_event_one_user(as, event); 188 as->suspend_state != SUSPEND_NONE) {
189 ret = -EBUSY;
190 goto out;
191 }
180 } 192 }
193
194 list_for_each_entry(as, &apm_user_list, list) {
195 if (as != sender && as->reader && as->writer && as->suser) {
196 as->suspend_state = SUSPEND_PENDING;
197 suspends_pending++;
198 queue_add_event(&as->queue, event);
199 ret = 0;
200 }
201 }
202 out:
181 up_read(&user_list_lock); 203 up_read(&user_list_lock);
204 mutex_unlock(&state_lock);
182 wake_up_interruptible(&apm_waitqueue); 205 wake_up_interruptible(&apm_waitqueue);
206 return ret;
183} 207}
184 208
185static void apm_suspend(void) 209static void apm_suspend(void)
@@ -191,17 +215,22 @@ static void apm_suspend(void)
191 * Anyone on the APM queues will think we're still suspended. 215 * Anyone on the APM queues will think we're still suspended.
192 * Send a message so everyone knows we're now awake again. 216 * Send a message so everyone knows we're now awake again.
193 */ 217 */
194 queue_event(APM_NORMAL_RESUME, NULL); 218 queue_event(APM_NORMAL_RESUME);
195 219
196 /* 220 /*
197 * Finally, wake up anyone who is sleeping on the suspend. 221 * Finally, wake up anyone who is sleeping on the suspend.
198 */ 222 */
223 mutex_lock(&state_lock);
199 down_read(&user_list_lock); 224 down_read(&user_list_lock);
200 list_for_each_entry(as, &apm_user_list, list) { 225 list_for_each_entry(as, &apm_user_list, list) {
201 as->suspend_result = err; 226 if (as->suspend_state == SUSPEND_WAIT ||
202 as->suspend_state = SUSPEND_DONE; 227 as->suspend_state == SUSPEND_ACKED) {
228 as->suspend_result = err;
229 as->suspend_state = SUSPEND_DONE;
230 }
203 } 231 }
204 up_read(&user_list_lock); 232 up_read(&user_list_lock);
233 mutex_unlock(&state_lock);
205 234
206 wake_up(&apm_suspend_waitqueue); 235 wake_up(&apm_suspend_waitqueue);
207} 236}
@@ -227,8 +256,11 @@ static ssize_t apm_read(struct file *fp, char __user *buf, size_t count, loff_t
227 if (copy_to_user(buf, &event, sizeof(event))) 256 if (copy_to_user(buf, &event, sizeof(event)))
228 break; 257 break;
229 258
230 if (event == APM_SYS_SUSPEND || event == APM_USER_SUSPEND) 259 mutex_lock(&state_lock);
260 if (as->suspend_state == SUSPEND_PENDING &&
261 (event == APM_SYS_SUSPEND || event == APM_USER_SUSPEND))
231 as->suspend_state = SUSPEND_READ; 262 as->suspend_state = SUSPEND_READ;
263 mutex_unlock(&state_lock);
232 264
233 buf += sizeof(event); 265 buf += sizeof(event);
234 i -= sizeof(event); 266 i -= sizeof(event);
@@ -270,9 +302,13 @@ apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg)
270 302
271 switch (cmd) { 303 switch (cmd) {
272 case APM_IOC_SUSPEND: 304 case APM_IOC_SUSPEND:
305 mutex_lock(&state_lock);
306
273 as->suspend_result = -EINTR; 307 as->suspend_result = -EINTR;
274 308
275 if (as->suspend_state == SUSPEND_READ) { 309 if (as->suspend_state == SUSPEND_READ) {
310 int pending;
311
276 /* 312 /*
277 * If we read a suspend command from /dev/apm_bios, 313 * If we read a suspend command from /dev/apm_bios,
278 * then the corresponding APM_IOC_SUSPEND ioctl is 314 * then the corresponding APM_IOC_SUSPEND ioctl is
@@ -280,47 +316,73 @@ apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg)
280 */ 316 */
281 as->suspend_state = SUSPEND_ACKED; 317 as->suspend_state = SUSPEND_ACKED;
282 suspends_pending--; 318 suspends_pending--;
319 pending = suspends_pending == 0;
320 mutex_unlock(&state_lock);
321
322 /*
323 * If there are no further acknowledges required,
324 * suspend the system.
325 */
326 if (pending)
327 apm_suspend();
328
329 /*
330 * Wait for the suspend/resume to complete. If there
331 * are pending acknowledges, we wait here for them.
332 *
333 * Note: we need to ensure that the PM subsystem does
334 * not kick us out of the wait when it suspends the
335 * threads.
336 */
337 flags = current->flags;
338 current->flags |= PF_NOFREEZE;
339
340 wait_event(apm_suspend_waitqueue,
341 as->suspend_state == SUSPEND_DONE);
283 } else { 342 } else {
343 as->suspend_state = SUSPEND_WAIT;
344 mutex_unlock(&state_lock);
345
284 /* 346 /*
285 * Otherwise it is a request to suspend the system. 347 * Otherwise it is a request to suspend the system.
286 * Queue an event for all readers, and expect an 348 * Queue an event for all readers, and expect an
287 * acknowledge from all writers who haven't already 349 * acknowledge from all writers who haven't already
288 * acknowledged. 350 * acknowledged.
289 */ 351 */
290 queue_event(APM_USER_SUSPEND, as); 352 err = queue_suspend_event(APM_USER_SUSPEND, as);
291 } 353 if (err < 0) {
292 354 /*
293 /* 355 * Avoid taking the lock here - this
294 * If there are no further acknowledges required, suspend 356 * should be fine.
295 * the system. 357 */
296 */ 358 as->suspend_state = SUSPEND_NONE;
297 if (suspends_pending == 0) 359 break;
298 apm_suspend(); 360 }
361
362 if (err > 0)
363 apm_suspend();
299 364
300 /* 365 /*
301 * Wait for the suspend/resume to complete. If there are 366 * Wait for the suspend/resume to complete. If there
302 * pending acknowledges, we wait here for them. 367 * are pending acknowledges, we wait here for them.
303 * 368 *
304 * Note that we need to ensure that the PM subsystem does 369 * Note: we need to ensure that the PM subsystem does
305 * not kick us out of the wait when it suspends the threads. 370 * not kick us out of the wait when it suspends the
306 */ 371 * threads.
307 flags = current->flags; 372 */
308 current->flags |= PF_NOFREEZE; 373 flags = current->flags;
374 current->flags |= PF_NOFREEZE;
309 375
310 /*
311 * Note: do not allow a thread which is acking the suspend
312 * to escape until the resume is complete.
313 */
314 if (as->suspend_state == SUSPEND_ACKED)
315 wait_event(apm_suspend_waitqueue,
316 as->suspend_state == SUSPEND_DONE);
317 else
318 wait_event_interruptible(apm_suspend_waitqueue, 376 wait_event_interruptible(apm_suspend_waitqueue,
319 as->suspend_state == SUSPEND_DONE); 377 as->suspend_state == SUSPEND_DONE);
378 }
320 379
321 current->flags = flags; 380 current->flags = flags;
381
382 mutex_lock(&state_lock);
322 err = as->suspend_result; 383 err = as->suspend_result;
323 as->suspend_state = SUSPEND_NONE; 384 as->suspend_state = SUSPEND_NONE;
385 mutex_unlock(&state_lock);
324 break; 386 break;
325 } 387 }
326 388
@@ -330,6 +392,8 @@ apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg)
330static int apm_release(struct inode * inode, struct file * filp) 392static int apm_release(struct inode * inode, struct file * filp)
331{ 393{
332 struct apm_user *as = filp->private_data; 394 struct apm_user *as = filp->private_data;
395 int pending = 0;
396
333 filp->private_data = NULL; 397 filp->private_data = NULL;
334 398
335 down_write(&user_list_lock); 399 down_write(&user_list_lock);
@@ -342,11 +406,14 @@ static int apm_release(struct inode * inode, struct file * filp)
342 * need to balance suspends_pending, which means the 406 * need to balance suspends_pending, which means the
343 * possibility of sleeping. 407 * possibility of sleeping.
344 */ 408 */
409 mutex_lock(&state_lock);
345 if (as->suspend_state != SUSPEND_NONE) { 410 if (as->suspend_state != SUSPEND_NONE) {
346 suspends_pending -= 1; 411 suspends_pending -= 1;
347 if (suspends_pending == 0) 412 pending = suspends_pending == 0;
348 apm_suspend();
349 } 413 }
414 mutex_unlock(&state_lock);
415 if (pending)
416 apm_suspend();
350 417
351 kfree(as); 418 kfree(as);
352 return 0; 419 return 0;
@@ -470,6 +537,7 @@ static int kapmd(void *arg)
470{ 537{
471 do { 538 do {
472 apm_event_t event; 539 apm_event_t event;
540 int ret;
473 541
474 wait_event_interruptible(kapmd_wait, 542 wait_event_interruptible(kapmd_wait,
475 !queue_empty(&kapmd_queue) || kthread_should_stop()); 543 !queue_empty(&kapmd_queue) || kthread_should_stop());
@@ -489,13 +557,20 @@ static int kapmd(void *arg)
489 557
490 case APM_LOW_BATTERY: 558 case APM_LOW_BATTERY:
491 case APM_POWER_STATUS_CHANGE: 559 case APM_POWER_STATUS_CHANGE:
492 queue_event(event, NULL); 560 queue_event(event);
493 break; 561 break;
494 562
495 case APM_USER_SUSPEND: 563 case APM_USER_SUSPEND:
496 case APM_SYS_SUSPEND: 564 case APM_SYS_SUSPEND:
497 queue_event(event, NULL); 565 ret = queue_suspend_event(event, NULL);
498 if (suspends_pending == 0) 566 if (ret < 0) {
567 /*
568 * We were busy. Try again in 50ms.
569 */
570 queue_add_event(&kapmd_queue, event);
571 msleep(50);
572 }
573 if (ret > 0)
499 apm_suspend(); 574 apm_suspend();
500 break; 575 break;
501 576
diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index cc2d58d028e1..3c078e346753 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -15,6 +15,7 @@
15#include <asm/mach/arch.h> 15#include <asm/mach/arch.h>
16#include <asm/thread_info.h> 16#include <asm/thread_info.h>
17#include <asm/memory.h> 17#include <asm/memory.h>
18#include <asm/procinfo.h>
18 19
19/* 20/*
20 * Make sure that the compiler and target are compatible. 21 * Make sure that the compiler and target are compatible.
diff --git a/arch/arm/kernel/ecard.c b/arch/arm/kernel/ecard.c
index b27513a0f11e..a786f769035d 100644
--- a/arch/arm/kernel/ecard.c
+++ b/arch/arm/kernel/ecard.c
@@ -529,7 +529,7 @@ static void ecard_dump_irq_state(void)
529 } 529 }
530} 530}
531 531
532static void ecard_check_lockup(struct irqdesc *desc) 532static void ecard_check_lockup(struct irq_desc *desc)
533{ 533{
534 static unsigned long last; 534 static unsigned long last;
535 static int lockup; 535 static int lockup;
@@ -567,7 +567,7 @@ static void ecard_check_lockup(struct irqdesc *desc)
567} 567}
568 568
569static void 569static void
570ecard_irq_handler(unsigned int irq, struct irqdesc *desc) 570ecard_irq_handler(unsigned int irq, struct irq_desc *desc)
571{ 571{
572 ecard_t *ec; 572 ecard_t *ec;
573 int called = 0; 573 int called = 0;
@@ -585,7 +585,7 @@ ecard_irq_handler(unsigned int irq, struct irqdesc *desc)
585 pending = ecard_default_ops.irqpending(ec); 585 pending = ecard_default_ops.irqpending(ec);
586 586
587 if (pending) { 587 if (pending) {
588 struct irqdesc *d = irq_desc + ec->irq; 588 struct irq_desc *d = irq_desc + ec->irq;
589 desc_handle_irq(ec->irq, d); 589 desc_handle_irq(ec->irq, d);
590 called ++; 590 called ++;
591 } 591 }
@@ -609,7 +609,7 @@ static unsigned char first_set[] =
609}; 609};
610 610
611static void 611static void
612ecard_irqexp_handler(unsigned int irq, struct irqdesc *desc) 612ecard_irqexp_handler(unsigned int irq, struct irq_desc *desc)
613{ 613{
614 const unsigned int statusmask = 15; 614 const unsigned int statusmask = 15;
615 unsigned int status; 615 unsigned int status;
@@ -1022,7 +1022,7 @@ ecard_probe(int slot, card_type_t type)
1022 if (slot < 8) { 1022 if (slot < 8) {
1023 ec->irq = 32 + slot; 1023 ec->irq = 32 + slot;
1024 set_irq_chip(ec->irq, &ecard_chip); 1024 set_irq_chip(ec->irq, &ecard_chip);
1025 set_irq_handler(ec->irq, do_level_IRQ); 1025 set_irq_handler(ec->irq, handle_level_irq);
1026 set_irq_flags(ec->irq, IRQF_VALID); 1026 set_irq_flags(ec->irq, IRQF_VALID);
1027 } 1027 }
1028 1028
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index bd623b73445f..2db42b18f53f 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -589,10 +589,6 @@ ENTRY(__switch_to)
589 strex r5, r4, [ip] @ Clear exclusive monitor 589 strex r5, r4, [ip] @ Clear exclusive monitor
590#endif 590#endif
591#endif 591#endif
592#if defined(CONFIG_CPU_XSCALE) && !defined(CONFIG_IWMMXT)
593 mra r4, r5, acc0
594 stmia ip, {r4, r5}
595#endif
596#if defined(CONFIG_HAS_TLS_REG) 592#if defined(CONFIG_HAS_TLS_REG)
597 mcr p15, 0, r3, c13, c0, 3 @ set TLS register 593 mcr p15, 0, r3, c13, c0, 3 @ set TLS register
598#elif !defined(CONFIG_TLS_REG_EMUL) 594#elif !defined(CONFIG_TLS_REG_EMUL)
@@ -602,11 +598,6 @@ ENTRY(__switch_to)
602#ifdef CONFIG_MMU 598#ifdef CONFIG_MMU
603 mcr p15, 0, r6, c3, c0, 0 @ Set domain register 599 mcr p15, 0, r6, c3, c0, 0 @ Set domain register
604#endif 600#endif
605#if defined(CONFIG_CPU_XSCALE) && !defined(CONFIG_IWMMXT)
606 add r4, r2, #TI_CPU_DOMAIN + 40 @ cpu_context_save->extra
607 ldmib r4, {r4, r5}
608 mar acc0, r4, r5
609#endif
610 mov r5, r0 601 mov r5, r0
611 add r4, r2, #TI_CPU_SAVE 602 add r4, r2, #TI_CPU_SAVE
612 ldr r0, =thread_notify_head 603 ldr r0, =thread_notify_head
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
index f359a189dcf2..0119c0d5f978 100644
--- a/arch/arm/kernel/head-nommu.S
+++ b/arch/arm/kernel/head-nommu.S
@@ -16,7 +16,6 @@
16 16
17#include <asm/assembler.h> 17#include <asm/assembler.h>
18#include <asm/mach-types.h> 18#include <asm/mach-types.h>
19#include <asm/procinfo.h>
20#include <asm/ptrace.h> 19#include <asm/ptrace.h>
21#include <asm/asm-offsets.h> 20#include <asm/asm-offsets.h>
22#include <asm/thread_info.h> 21#include <asm/thread_info.h>
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index ebc3e74a7947..bda0748ffb00 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -16,7 +16,6 @@
16 16
17#include <asm/assembler.h> 17#include <asm/assembler.h>
18#include <asm/domain.h> 18#include <asm/domain.h>
19#include <asm/procinfo.h>
20#include <asm/ptrace.h> 19#include <asm/ptrace.h>
21#include <asm/asm-offsets.h> 20#include <asm/asm-offsets.h>
22#include <asm/memory.h> 21#include <asm/memory.h>
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 2c4ff1cbe334..ec01f08f5642 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -112,7 +112,7 @@ static struct irq_desc bad_irq_desc = {
112asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs) 112asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
113{ 113{
114 struct pt_regs *old_regs = set_irq_regs(regs); 114 struct pt_regs *old_regs = set_irq_regs(regs);
115 struct irqdesc *desc = irq_desc + irq; 115 struct irq_desc *desc = irq_desc + irq;
116 116
117 /* 117 /*
118 * Some hardware gives randomly wrong interrupts. Rather 118 * Some hardware gives randomly wrong interrupts. Rather
@@ -134,7 +134,7 @@ asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
134 134
135void set_irq_flags(unsigned int irq, unsigned int iflags) 135void set_irq_flags(unsigned int irq, unsigned int iflags)
136{ 136{
137 struct irqdesc *desc; 137 struct irq_desc *desc;
138 unsigned long flags; 138 unsigned long flags;
139 139
140 if (irq >= NR_IRQS) { 140 if (irq >= NR_IRQS) {
@@ -171,7 +171,7 @@ void __init init_IRQ(void)
171 171
172#ifdef CONFIG_HOTPLUG_CPU 172#ifdef CONFIG_HOTPLUG_CPU
173 173
174static void route_irq(struct irqdesc *desc, unsigned int irq, unsigned int cpu) 174static void route_irq(struct irq_desc *desc, unsigned int irq, unsigned int cpu)
175{ 175{
176 pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", irq, desc->cpu, cpu); 176 pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", irq, desc->cpu, cpu);
177 177
@@ -190,7 +190,7 @@ void migrate_irqs(void)
190 unsigned int i, cpu = smp_processor_id(); 190 unsigned int i, cpu = smp_processor_id();
191 191
192 for (i = 0; i < NR_IRQS; i++) { 192 for (i = 0; i < NR_IRQS; i++) {
193 struct irqdesc *desc = irq_desc + i; 193 struct irq_desc *desc = irq_desc + i;
194 194
195 if (desc->cpu == cpu) { 195 if (desc->cpu == cpu) {
196 unsigned int newcpu = any_online_cpu(desc->affinity); 196 unsigned int newcpu = any_online_cpu(desc->affinity);
diff --git a/arch/arm/kernel/iwmmxt-notifier.c b/arch/arm/kernel/iwmmxt-notifier.c
deleted file mode 100644
index 0d1a1db40062..000000000000
--- a/arch/arm/kernel/iwmmxt-notifier.c
+++ /dev/null
@@ -1,63 +0,0 @@
1/*
2 * linux/arch/arm/kernel/iwmmxt-notifier.c
3 *
4 * XScale iWMMXt (Concan) context switching and handling
5 *
6 * Initial code:
7 * Copyright (c) 2003, Intel Corporation
8 *
9 * Full lazy switching support, optimizations and more, by Nicolas Pitre
10 * Copyright (c) 2003-2004, MontaVista Software, Inc.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17#include <linux/module.h>
18#include <linux/types.h>
19#include <linux/kernel.h>
20#include <linux/signal.h>
21#include <linux/sched.h>
22#include <linux/init.h>
23#include <asm/thread_notify.h>
24#include <asm/io.h>
25
26static int iwmmxt_do(struct notifier_block *self, unsigned long cmd, void *t)
27{
28 struct thread_info *thread = t;
29
30 switch (cmd) {
31 case THREAD_NOTIFY_FLUSH:
32 /*
33 * flush_thread() zeroes thread->fpstate, so no need
34 * to do anything here.
35 *
36 * FALLTHROUGH: Ensure we don't try to overwrite our newly
37 * initialised state information on the first fault.
38 */
39
40 case THREAD_NOTIFY_RELEASE:
41 iwmmxt_task_release(thread);
42 break;
43
44 case THREAD_NOTIFY_SWITCH:
45 iwmmxt_task_switch(thread);
46 break;
47 }
48
49 return NOTIFY_DONE;
50}
51
52static struct notifier_block iwmmxt_notifier_block = {
53 .notifier_call = iwmmxt_do,
54};
55
56static int __init iwmmxt_init(void)
57{
58 thread_register_notifier(&iwmmxt_notifier_block);
59
60 return 0;
61}
62
63late_initcall(iwmmxt_init);
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index bf35c178a877..a9e8f7e55fd6 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -281,67 +281,6 @@ void show_fpregs(struct user_fp *regs)
281} 281}
282 282
283/* 283/*
284 * Task structure and kernel stack allocation.
285 */
286struct thread_info_list {
287 unsigned long *head;
288 unsigned int nr;
289};
290
291static DEFINE_PER_CPU(struct thread_info_list, thread_info_list) = { NULL, 0 };
292
293#define EXTRA_TASK_STRUCT 4
294
295struct thread_info *alloc_thread_info(struct task_struct *task)
296{
297 struct thread_info *thread = NULL;
298
299 if (EXTRA_TASK_STRUCT) {
300 struct thread_info_list *th = &get_cpu_var(thread_info_list);
301 unsigned long *p = th->head;
302
303 if (p) {
304 th->head = (unsigned long *)p[0];
305 th->nr -= 1;
306 }
307 put_cpu_var(thread_info_list);
308
309 thread = (struct thread_info *)p;
310 }
311
312 if (!thread)
313 thread = (struct thread_info *)
314 __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
315
316#ifdef CONFIG_DEBUG_STACK_USAGE
317 /*
318 * The stack must be cleared if you want SYSRQ-T to
319 * give sensible stack usage information
320 */
321 if (thread)
322 memzero(thread, THREAD_SIZE);
323#endif
324 return thread;
325}
326
327void free_thread_info(struct thread_info *thread)
328{
329 if (EXTRA_TASK_STRUCT) {
330 struct thread_info_list *th = &get_cpu_var(thread_info_list);
331 if (th->nr < EXTRA_TASK_STRUCT) {
332 unsigned long *p = (unsigned long *)thread;
333 p[0] = (unsigned long)th->head;
334 th->head = p;
335 th->nr += 1;
336 put_cpu_var(thread_info_list);
337 return;
338 }
339 put_cpu_var(thread_info_list);
340 }
341 free_pages((unsigned long)thread, THREAD_SIZE_ORDER);
342}
343
344/*
345 * Free current thread data structures etc.. 284 * Free current thread data structures etc..
346 */ 285 */
347void exit_thread(void) 286void exit_thread(void)
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 29efc9f82057..238dd9b6db84 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -357,9 +357,6 @@ static void __init setup_processor(void)
357#ifndef CONFIG_VFP 357#ifndef CONFIG_VFP
358 elf_hwcap &= ~HWCAP_VFP; 358 elf_hwcap &= ~HWCAP_VFP;
359#endif 359#endif
360#ifndef CONFIG_IWMMXT
361 elf_hwcap &= ~HWCAP_IWMMXT;
362#endif
363 360
364 cpu_proc_init(); 361 cpu_proc_init();
365} 362}
@@ -441,16 +438,19 @@ __early_param("initrd=", early_initrd);
441 438
442static void __init arm_add_memory(unsigned long start, unsigned long size) 439static void __init arm_add_memory(unsigned long start, unsigned long size)
443{ 440{
441 struct membank *bank;
442
444 /* 443 /*
445 * Ensure that start/size are aligned to a page boundary. 444 * Ensure that start/size are aligned to a page boundary.
446 * Size is appropriately rounded down, start is rounded up. 445 * Size is appropriately rounded down, start is rounded up.
447 */ 446 */
448 size -= start & ~PAGE_MASK; 447 size -= start & ~PAGE_MASK;
449 448
450 meminfo.bank[meminfo.nr_banks].start = PAGE_ALIGN(start); 449 bank = &meminfo.bank[meminfo.nr_banks++];
451 meminfo.bank[meminfo.nr_banks].size = size & PAGE_MASK; 450
452 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(start); 451 bank->start = PAGE_ALIGN(start);
453 meminfo.nr_banks += 1; 452 bank->size = size & PAGE_MASK;
453 bank->node = PHYS_TO_NID(start);
454} 454}
455 455
456/* 456/*
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 48cf7fffddf2..f2b1d61fbc0e 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -12,6 +12,7 @@
12#include <linux/ptrace.h> 12#include <linux/ptrace.h>
13#include <linux/personality.h> 13#include <linux/personality.h>
14 14
15#include <asm/elf.h>
15#include <asm/cacheflush.h> 16#include <asm/cacheflush.h>
16#include <asm/ucontext.h> 17#include <asm/ucontext.h>
17#include <asm/uaccess.h> 18#include <asm/uaccess.h>
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index bede380c07a9..042a12982e98 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -631,12 +631,9 @@ baddataabort(int code, unsigned long instr, struct pt_regs *regs)
631 notify_die("unknown data abort code", regs, &info, instr, 0); 631 notify_die("unknown data abort code", regs, &info, instr, 0);
632} 632}
633 633
634void __attribute__((noreturn)) __bug(const char *file, int line, void *data) 634void __attribute__((noreturn)) __bug(const char *file, int line)
635{ 635{
636 printk(KERN_CRIT"kernel BUG at %s:%d!", file, line); 636 printk(KERN_CRIT"kernel BUG at %s:%d!\n", file, line);
637 if (data)
638 printk(" - extra data = %p", data);
639 printk("\n");
640 *(int *)0 = 0; 637 *(int *)0 = 0;
641 638
642 /* Avoid "noreturn function does return" */ 639 /* Avoid "noreturn function does return" */
diff --git a/arch/arm/kernel/xscale-cp0.c b/arch/arm/kernel/xscale-cp0.c
new file mode 100644
index 000000000000..180000bfdc8f
--- /dev/null
+++ b/arch/arm/kernel/xscale-cp0.c
@@ -0,0 +1,179 @@
1/*
2 * linux/arch/arm/kernel/xscale-cp0.c
3 *
4 * XScale DSP and iWMMXt coprocessor context switching and handling
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/signal.h>
15#include <linux/sched.h>
16#include <linux/init.h>
17#include <asm/thread_notify.h>
18#include <asm/io.h>
19
20static inline void dsp_save_state(u32 *state)
21{
22 __asm__ __volatile__ (
23 "mrrc p0, 0, %0, %1, c0\n"
24 : "=r" (state[0]), "=r" (state[1]));
25}
26
27static inline void dsp_load_state(u32 *state)
28{
29 __asm__ __volatile__ (
30 "mcrr p0, 0, %0, %1, c0\n"
31 : : "r" (state[0]), "r" (state[1]));
32}
33
34static int dsp_do(struct notifier_block *self, unsigned long cmd, void *t)
35{
36 struct thread_info *thread = t;
37
38 switch (cmd) {
39 case THREAD_NOTIFY_FLUSH:
40 thread->cpu_context.extra[0] = 0;
41 thread->cpu_context.extra[1] = 0;
42 break;
43
44 case THREAD_NOTIFY_SWITCH:
45 dsp_save_state(current_thread_info()->cpu_context.extra);
46 dsp_load_state(thread->cpu_context.extra);
47 break;
48 }
49
50 return NOTIFY_DONE;
51}
52
53static struct notifier_block dsp_notifier_block = {
54 .notifier_call = dsp_do,
55};
56
57
58#ifdef CONFIG_IWMMXT
59static int iwmmxt_do(struct notifier_block *self, unsigned long cmd, void *t)
60{
61 struct thread_info *thread = t;
62
63 switch (cmd) {
64 case THREAD_NOTIFY_FLUSH:
65 /*
66 * flush_thread() zeroes thread->fpstate, so no need
67 * to do anything here.
68 *
69 * FALLTHROUGH: Ensure we don't try to overwrite our newly
70 * initialised state information on the first fault.
71 */
72
73 case THREAD_NOTIFY_RELEASE:
74 iwmmxt_task_release(thread);
75 break;
76
77 case THREAD_NOTIFY_SWITCH:
78 iwmmxt_task_switch(thread);
79 break;
80 }
81
82 return NOTIFY_DONE;
83}
84
85static struct notifier_block iwmmxt_notifier_block = {
86 .notifier_call = iwmmxt_do,
87};
88#endif
89
90
91static u32 __init xscale_cp_access_read(void)
92{
93 u32 value;
94
95 __asm__ __volatile__ (
96 "mrc p15, 0, %0, c15, c1, 0\n\t"
97 : "=r" (value));
98
99 return value;
100}
101
102static void __init xscale_cp_access_write(u32 value)
103{
104 u32 temp;
105
106 __asm__ __volatile__ (
107 "mcr p15, 0, %1, c15, c1, 0\n\t"
108 "mrc p15, 0, %0, c15, c1, 0\n\t"
109 "mov %0, %0\n\t"
110 "sub pc, pc, #4\n\t"
111 : "=r" (temp) : "r" (value));
112}
113
114/*
115 * Detect whether we have a MAC coprocessor (40 bit register) or an
116 * iWMMXt coprocessor (64 bit registers) by loading 00000100:00000000
117 * into a coprocessor register and reading it back, and checking
118 * whether the upper word survived intact.
119 */
120static int __init cpu_has_iwmmxt(void)
121{
122 u32 lo;
123 u32 hi;
124
125 /*
126 * This sequence is interpreted by the DSP coprocessor as:
127 * mar acc0, %2, %3
128 * mra %0, %1, acc0
129 *
130 * And by the iWMMXt coprocessor as:
131 * tmcrr wR0, %2, %3
132 * tmrrc %0, %1, wR0
133 */
134 __asm__ __volatile__ (
135 "mcrr p0, 0, %2, %3, c0\n"
136 "mrrc p0, 0, %0, %1, c0\n"
137 : "=r" (lo), "=r" (hi)
138 : "r" (0), "r" (0x100));
139
140 return !!hi;
141}
142
143
144/*
145 * If we detect that the CPU has iWMMXt (and CONFIG_IWMMXT=y), we
146 * disable CP0/CP1 on boot, and let call_fpe() and the iWMMXt lazy
147 * switch code handle iWMMXt context switching. If on the other
148 * hand the CPU has a DSP coprocessor, we keep access to CP0 enabled
149 * all the time, and save/restore acc0 on context switch in non-lazy
150 * fashion.
151 */
152static int __init xscale_cp0_init(void)
153{
154 u32 cp_access;
155
156 cp_access = xscale_cp_access_read() & ~3;
157 xscale_cp_access_write(cp_access | 1);
158
159 if (cpu_has_iwmmxt()) {
160#ifndef CONFIG_IWMMXT
161 printk(KERN_WARNING "CAUTION: XScale iWMMXt coprocessor "
162 "detected, but kernel support is missing.\n");
163#else
164 printk(KERN_INFO "XScale iWMMXt coprocessor detected.\n");
165 elf_hwcap |= HWCAP_IWMMXT;
166 thread_register_notifier(&iwmmxt_notifier_block);
167#endif
168 } else {
169 printk(KERN_INFO "XScale DSP coprocessor detected.\n");
170 thread_register_notifier(&dsp_notifier_block);
171 cp_access |= 1;
172 }
173
174 xscale_cp_access_write(cp_access);
175
176 return 0;
177}
178
179late_initcall(xscale_cp0_init);
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-01 08:42:13 -0500