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9#include <linux/module.h>
10#include <linux/smp_lock.h>
11#include <linux/unistd.h>
12#include <linux/user.h>
13#include <linux/uaccess.h>
14#include <linux/sched.h>
15#include <linux/tick.h>
16#include <linux/fs.h>
17#include <linux/err.h>
18
19#include <asm/blackfin.h>
20#include <asm/fixed_code.h>
21#include <asm/mem_map.h>
22
23asmlinkage void ret_from_fork(void);
24
25
26
27
28void *current_l1_stack_save;
29
30
31
32
33int nr_l1stack_tasks;
34
35
36
37
38void *l1_stack_base;
39unsigned long l1_stack_len;
40
41
42
43
44void (*pm_idle)(void) = NULL;
45EXPORT_SYMBOL(pm_idle);
46
47void (*pm_power_off)(void) = NULL;
48EXPORT_SYMBOL(pm_power_off);
49
50
51
52
53#ifdef CONFIG_IDLE_L1
54static void default_idle(void)__attribute__((l1_text));
55void cpu_idle(void)__attribute__((l1_text));
56#endif
57
58
59
60
61
62static void default_idle(void)
63{
64#ifdef CONFIG_IPIPE
65 ipipe_suspend_domain();
66#endif
67 local_irq_disable_hw();
68 if (!need_resched())
69 idle_with_irq_disabled();
70
71 local_irq_enable_hw();
72}
73
74
75
76
77
78
79void cpu_idle(void)
80{
81
82 while (1) {
83 void (*idle)(void) = pm_idle;
84
85#ifdef CONFIG_HOTPLUG_CPU
86 if (cpu_is_offline(smp_processor_id()))
87 cpu_die();
88#endif
89 if (!idle)
90 idle = default_idle;
91 tick_nohz_stop_sched_tick(1);
92 while (!need_resched())
93 idle();
94 tick_nohz_restart_sched_tick();
95 preempt_enable_no_resched();
96 schedule();
97 preempt_disable();
98 }
99}
100
101
102
103int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpregs)
104{
105 return 1;
106}
107
108
109
110
111
112
113void kernel_thread_helper(void);
114__asm__(".section .text\n"
115 ".align 4\n"
116 "_kernel_thread_helper:\n\t"
117 "\tsp += -12;\n\t"
118 "\tr0 = r1;\n\t" "\tcall (p1);\n\t" "\tcall _do_exit;\n" ".previous");
119
120
121
122
123pid_t kernel_thread(int (*fn) (void *), void *arg, unsigned long flags)
124{
125 struct pt_regs regs;
126
127 memset(®s, 0, sizeof(regs));
128
129 regs.r1 = (unsigned long)arg;
130 regs.p1 = (unsigned long)fn;
131 regs.pc = (unsigned long)kernel_thread_helper;
132 regs.orig_p0 = -1;
133
134
135 regs.ipend = 0x8002;
136 __asm__ __volatile__("%0 = syscfg;":"=da"(regs.syscfg):);
137 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL,
138 NULL);
139}
140EXPORT_SYMBOL(kernel_thread);
141
142
143
144
145
146
147
148void start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
149{
150 set_fs(USER_DS);
151 regs->pc = new_ip;
152 if (current->mm)
153 regs->p5 = current->mm->start_data;
154#ifndef CONFIG_SMP
155 task_thread_info(current)->l1_task_info.stack_start =
156 (void *)current->mm->context.stack_start;
157 task_thread_info(current)->l1_task_info.lowest_sp = (void *)new_sp;
158 memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info,
159 sizeof(*L1_SCRATCH_TASK_INFO));
160#endif
161 wrusp(new_sp);
162}
163EXPORT_SYMBOL_GPL(start_thread);
164
165void flush_thread(void)
166{
167}
168
169asmlinkage int bfin_vfork(struct pt_regs *regs)
170{
171 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL,
172 NULL);
173}
174
175asmlinkage int bfin_clone(struct pt_regs *regs)
176{
177 unsigned long clone_flags;
178 unsigned long newsp;
179
180#ifdef __ARCH_SYNC_CORE_DCACHE
181 if (current->rt.nr_cpus_allowed == num_possible_cpus()) {
182 current->cpus_allowed = cpumask_of_cpu(smp_processor_id());
183 current->rt.nr_cpus_allowed = 1;
184 }
185#endif
186
187
188 clone_flags = regs->r0;
189 newsp = regs->r1;
190 if (!newsp)
191 newsp = rdusp();
192 else
193 newsp -= 12;
194 return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
195}
196
197int
198copy_thread(unsigned long clone_flags,
199 unsigned long usp, unsigned long topstk,
200 struct task_struct *p, struct pt_regs *regs)
201{
202 struct pt_regs *childregs;
203
204 childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
205 *childregs = *regs;
206 childregs->r0 = 0;
207
208 p->thread.usp = usp;
209 p->thread.ksp = (unsigned long)childregs;
210 p->thread.pc = (unsigned long)ret_from_fork;
211
212 return 0;
213}
214
215
216
217
218
219asmlinkage int sys_execve(char __user *name, char __user * __user *argv, char __user * __user *envp)
220{
221 int error;
222 char *filename;
223 struct pt_regs *regs = (struct pt_regs *)((&name) + 6);
224
225 lock_kernel();
226 filename = getname(name);
227 error = PTR_ERR(filename);
228 if (IS_ERR(filename))
229 goto out;
230 error = do_execve(filename, argv, envp, regs);
231 putname(filename);
232 out:
233 unlock_kernel();
234 return error;
235}
236
237unsigned long get_wchan(struct task_struct *p)
238{
239 unsigned long fp, pc;
240 unsigned long stack_page;
241 int count = 0;
242 if (!p || p == current || p->state == TASK_RUNNING)
243 return 0;
244
245 stack_page = (unsigned long)p;
246 fp = p->thread.usp;
247 do {
248 if (fp < stack_page + sizeof(struct thread_info) ||
249 fp >= 8184 + stack_page)
250 return 0;
251 pc = ((unsigned long *)fp)[1];
252 if (!in_sched_functions(pc))
253 return pc;
254 fp = *(unsigned long *)fp;
255 }
256 while (count++ < 16);
257 return 0;
258}
259
260void finish_atomic_sections (struct pt_regs *regs)
261{
262 int __user *up0 = (int __user *)regs->p0;
263
264 switch (regs->pc) {
265 case ATOMIC_XCHG32 + 2:
266 put_user(regs->r1, up0);
267 regs->pc = ATOMIC_XCHG32 + 4;
268 break;
269
270 case ATOMIC_CAS32 + 2:
271 case ATOMIC_CAS32 + 4:
272 if (regs->r0 == regs->r1)
273 case ATOMIC_CAS32 + 6:
274 put_user(regs->r2, up0);
275 regs->pc = ATOMIC_CAS32 + 8;
276 break;
277
278 case ATOMIC_ADD32 + 2:
279 regs->r0 = regs->r1 + regs->r0;
280
281 case ATOMIC_ADD32 + 4:
282 put_user(regs->r0, up0);
283 regs->pc = ATOMIC_ADD32 + 6;
284 break;
285
286 case ATOMIC_SUB32 + 2:
287 regs->r0 = regs->r1 - regs->r0;
288
289 case ATOMIC_SUB32 + 4:
290 put_user(regs->r0, up0);
291 regs->pc = ATOMIC_SUB32 + 6;
292 break;
293
294 case ATOMIC_IOR32 + 2:
295 regs->r0 = regs->r1 | regs->r0;
296
297 case ATOMIC_IOR32 + 4:
298 put_user(regs->r0, up0);
299 regs->pc = ATOMIC_IOR32 + 6;
300 break;
301
302 case ATOMIC_AND32 + 2:
303 regs->r0 = regs->r1 & regs->r0;
304
305 case ATOMIC_AND32 + 4:
306 put_user(regs->r0, up0);
307 regs->pc = ATOMIC_AND32 + 6;
308 break;
309
310 case ATOMIC_XOR32 + 2:
311 regs->r0 = regs->r1 ^ regs->r0;
312
313 case ATOMIC_XOR32 + 4:
314 put_user(regs->r0, up0);
315 regs->pc = ATOMIC_XOR32 + 6;
316 break;
317 }
318}
319
320static inline
321int in_mem(unsigned long addr, unsigned long size,
322 unsigned long start, unsigned long end)
323{
324 return addr >= start && addr + size <= end;
325}
326static inline
327int in_mem_const_off(unsigned long addr, unsigned long size, unsigned long off,
328 unsigned long const_addr, unsigned long const_size)
329{
330 return const_size &&
331 in_mem(addr, size, const_addr + off, const_addr + const_size);
332}
333static inline
334int in_mem_const(unsigned long addr, unsigned long size,
335 unsigned long const_addr, unsigned long const_size)
336{
337 return in_mem_const_off(addr, size, 0, const_addr, const_size);
338}
339#define IN_ASYNC(bnum, bctlnum) \
340({ \
341 (bfin_read_EBIU_AMGCTL() & 0xe) < ((bnum + 1) << 1) ? -EFAULT : \
342 bfin_read_EBIU_AMBCTL##bctlnum() & B##bnum##RDYEN ? -EFAULT : \
343 BFIN_MEM_ACCESS_CORE; \
344})
345
346int bfin_mem_access_type(unsigned long addr, unsigned long size)
347{
348 int cpu = raw_smp_processor_id();
349
350
351 if (addr > ULONG_MAX - size)
352 return -EFAULT;
353
354 if (in_mem(addr, size, FIXED_CODE_START, physical_mem_end))
355 return BFIN_MEM_ACCESS_CORE;
356
357 if (in_mem_const(addr, size, L1_CODE_START, L1_CODE_LENGTH))
358 return cpu == 0 ? BFIN_MEM_ACCESS_ITEST : BFIN_MEM_ACCESS_IDMA;
359 if (in_mem_const(addr, size, L1_SCRATCH_START, L1_SCRATCH_LENGTH))
360 return cpu == 0 ? BFIN_MEM_ACCESS_CORE_ONLY : -EFAULT;
361 if (in_mem_const(addr, size, L1_DATA_A_START, L1_DATA_A_LENGTH))
362 return cpu == 0 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
363 if (in_mem_const(addr, size, L1_DATA_B_START, L1_DATA_B_LENGTH))
364 return cpu == 0 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
365#ifdef COREB_L1_CODE_START
366 if (in_mem_const(addr, size, COREB_L1_CODE_START, COREB_L1_CODE_LENGTH))
367 return cpu == 1 ? BFIN_MEM_ACCESS_ITEST : BFIN_MEM_ACCESS_IDMA;
368 if (in_mem_const(addr, size, COREB_L1_SCRATCH_START, L1_SCRATCH_LENGTH))
369 return cpu == 1 ? BFIN_MEM_ACCESS_CORE_ONLY : -EFAULT;
370 if (in_mem_const(addr, size, COREB_L1_DATA_A_START, COREB_L1_DATA_A_LENGTH))
371 return cpu == 1 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
372 if (in_mem_const(addr, size, COREB_L1_DATA_B_START, COREB_L1_DATA_B_LENGTH))
373 return cpu == 1 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
374#endif
375 if (in_mem_const(addr, size, L2_START, L2_LENGTH))
376 return BFIN_MEM_ACCESS_CORE;
377
378 if (addr >= SYSMMR_BASE)
379 return BFIN_MEM_ACCESS_CORE_ONLY;
380
381
382
383
384 if (in_mem_const(addr, size, ASYNC_BANK0_BASE, ASYNC_BANK0_SIZE))
385 return IN_ASYNC(0, 0);
386 if (in_mem_const(addr, size, ASYNC_BANK1_BASE, ASYNC_BANK1_SIZE))
387 return IN_ASYNC(1, 0);
388 if (in_mem_const(addr, size, ASYNC_BANK2_BASE, ASYNC_BANK2_SIZE))
389 return IN_ASYNC(2, 1);
390 if (in_mem_const(addr, size, ASYNC_BANK3_BASE, ASYNC_BANK3_SIZE))
391 return IN_ASYNC(3, 1);
392
393 if (in_mem_const(addr, size, BOOT_ROM_START, BOOT_ROM_LENGTH))
394 return BFIN_MEM_ACCESS_CORE;
395 if (in_mem_const(addr, size, L1_ROM_START, L1_ROM_LENGTH))
396 return BFIN_MEM_ACCESS_DMA;
397
398 return -EFAULT;
399}
400
401#if defined(CONFIG_ACCESS_CHECK)
402#ifdef CONFIG_ACCESS_OK_L1
403__attribute__((l1_text))
404#endif
405
406int _access_ok(unsigned long addr, unsigned long size)
407{
408 if (size == 0)
409 return 1;
410
411 if (addr > ULONG_MAX - size)
412 return 0;
413 if (segment_eq(get_fs(), KERNEL_DS))
414 return 1;
415#ifdef CONFIG_MTD_UCLINUX
416 if (1)
417#else
418 if (0)
419#endif
420 {
421 if (in_mem(addr, size, memory_start, memory_end))
422 return 1;
423 if (in_mem(addr, size, memory_mtd_end, physical_mem_end))
424 return 1;
425# ifndef CONFIG_ROMFS_ON_MTD
426 if (0)
427# endif
428
429 if (in_mem(addr, size, memory_mtd_start, memory_mtd_end))
430 return 1;
431 } else {
432 if (in_mem(addr, size, memory_start, physical_mem_end))
433 return 1;
434 }
435
436 if (in_mem(addr, size, (unsigned long)__init_begin, (unsigned long)__init_end))
437 return 1;
438
439 if (in_mem_const(addr, size, L1_CODE_START, L1_CODE_LENGTH))
440 return 1;
441 if (in_mem_const_off(addr, size, _etext_l1 - _stext_l1, L1_CODE_START, L1_CODE_LENGTH))
442 return 1;
443 if (in_mem_const_off(addr, size, _ebss_l1 - _sdata_l1, L1_DATA_A_START, L1_DATA_A_LENGTH))
444 return 1;
445 if (in_mem_const_off(addr, size, _ebss_b_l1 - _sdata_b_l1, L1_DATA_B_START, L1_DATA_B_LENGTH))
446 return 1;
447#ifdef COREB_L1_CODE_START
448 if (in_mem_const(addr, size, COREB_L1_CODE_START, COREB_L1_CODE_LENGTH))
449 return 1;
450 if (in_mem_const(addr, size, COREB_L1_SCRATCH_START, L1_SCRATCH_LENGTH))
451 return 1;
452 if (in_mem_const(addr, size, COREB_L1_DATA_A_START, COREB_L1_DATA_A_LENGTH))
453 return 1;
454 if (in_mem_const(addr, size, COREB_L1_DATA_B_START, COREB_L1_DATA_B_LENGTH))
455 return 1;
456#endif
457 if (in_mem_const_off(addr, size, _ebss_l2 - _stext_l2, L2_START, L2_LENGTH))
458 return 1;
459
460 if (in_mem_const(addr, size, BOOT_ROM_START, BOOT_ROM_LENGTH))
461 return 1;
462 if (in_mem_const(addr, size, L1_ROM_START, L1_ROM_LENGTH))
463 return 1;
464
465 return 0;
466}
467EXPORT_SYMBOL(_access_ok);
468#endif
469