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Linux/arch/unicore32/kernel/process.c

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  1 /*
  2  * linux/arch/unicore32/kernel/process.c
  3  *
  4  * Code specific to PKUnity SoC and UniCore ISA
  5  *
  6  * Copyright (C) 2001-2010 GUAN Xue-tao
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  */
 12 #include <stdarg.h>
 13 
 14 #include <linux/module.h>
 15 #include <linux/sched.h>
 16 #include <linux/kernel.h>
 17 #include <linux/mm.h>
 18 #include <linux/stddef.h>
 19 #include <linux/unistd.h>
 20 #include <linux/delay.h>
 21 #include <linux/reboot.h>
 22 #include <linux/interrupt.h>
 23 #include <linux/kallsyms.h>
 24 #include <linux/init.h>
 25 #include <linux/cpu.h>
 26 #include <linux/elfcore.h>
 27 #include <linux/pm.h>
 28 #include <linux/tick.h>
 29 #include <linux/utsname.h>
 30 #include <linux/uaccess.h>
 31 #include <linux/random.h>
 32 #include <linux/gpio.h>
 33 #include <linux/stacktrace.h>
 34 
 35 #include <asm/cacheflush.h>
 36 #include <asm/processor.h>
 37 #include <asm/stacktrace.h>
 38 
 39 #include "setup.h"
 40 
 41 static const char * const processor_modes[] = {
 42         "UK00", "UK01", "UK02", "UK03", "UK04", "UK05", "UK06", "UK07",
 43         "UK08", "UK09", "UK0A", "UK0B", "UK0C", "UK0D", "UK0E", "UK0F",
 44         "USER", "REAL", "INTR", "PRIV", "UK14", "UK15", "UK16", "ABRT",
 45         "UK18", "UK19", "UK1A", "EXTN", "UK1C", "UK1D", "UK1E", "SUSR"
 46 };
 47 
 48 void arch_cpu_idle(void)
 49 {
 50         cpu_do_idle();
 51         local_irq_enable();
 52 }
 53 
 54 void machine_halt(void)
 55 {
 56         gpio_set_value(GPO_SOFT_OFF, 0);
 57 }
 58 
 59 /*
 60  * Function pointers to optional machine specific functions
 61  */
 62 void (*pm_power_off)(void) = NULL;
 63 
 64 void machine_power_off(void)
 65 {
 66         if (pm_power_off)
 67                 pm_power_off();
 68         machine_halt();
 69 }
 70 
 71 void machine_restart(char *cmd)
 72 {
 73         /* Disable interrupts first */
 74         local_irq_disable();
 75 
 76         /*
 77          * Tell the mm system that we are going to reboot -
 78          * we may need it to insert some 1:1 mappings so that
 79          * soft boot works.
 80          */
 81         setup_mm_for_reboot();
 82 
 83         /* Clean and invalidate caches */
 84         flush_cache_all();
 85 
 86         /* Turn off caching */
 87         cpu_proc_fin();
 88 
 89         /* Push out any further dirty data, and ensure cache is empty */
 90         flush_cache_all();
 91 
 92         /*
 93          * Now handle reboot code.
 94          */
 95         if (reboot_mode == REBOOT_SOFT) {
 96                 /* Jump into ROM at address 0xffff0000 */
 97                 cpu_reset(VECTORS_BASE);
 98         } else {
 99                 writel(0x00002001, PM_PLLSYSCFG); /* cpu clk = 250M */
100                 writel(0x00100800, PM_PLLDDRCFG); /* ddr clk =  44M */
101                 writel(0x00002001, PM_PLLVGACFG); /* vga clk = 250M */
102 
103                 /* Use on-chip reset capability */
104                 /* following instructions must be in one icache line */
105                 __asm__ __volatile__(
106                         "       .align 5\n\t"
107                         "       stw     %1, [%0]\n\t"
108                         "201:   ldw     r0, [%0]\n\t"
109                         "       cmpsub.a        r0, #0\n\t"
110                         "       bne     201b\n\t"
111                         "       stw     %3, [%2]\n\t"
112                         "       nop; nop; nop\n\t"
113                         /* prefetch 3 instructions at most */
114                         :
115                         : "r" (PM_PMCR),
116                           "r" (PM_PMCR_CFBSYS | PM_PMCR_CFBDDR
117                                 | PM_PMCR_CFBVGA),
118                           "r" (RESETC_SWRR),
119                           "r" (RESETC_SWRR_SRB)
120                         : "r0", "memory");
121         }
122 
123         /*
124          * Whoops - the architecture was unable to reboot.
125          * Tell the user!
126          */
127         mdelay(1000);
128         printk(KERN_EMERG "Reboot failed -- System halted\n");
129         do { } while (1);
130 }
131 
132 void __show_regs(struct pt_regs *regs)
133 {
134         unsigned long flags;
135         char buf[64];
136 
137         show_regs_print_info(KERN_DEFAULT);
138         print_symbol("PC is at %s\n", instruction_pointer(regs));
139         print_symbol("LR is at %s\n", regs->UCreg_lr);
140         printk(KERN_DEFAULT "pc : [<%08lx>]    lr : [<%08lx>]    psr: %08lx\n"
141                "sp : %08lx  ip : %08lx  fp : %08lx\n",
142                 regs->UCreg_pc, regs->UCreg_lr, regs->UCreg_asr,
143                 regs->UCreg_sp, regs->UCreg_ip, regs->UCreg_fp);
144         printk(KERN_DEFAULT "r26: %08lx  r25: %08lx  r24: %08lx\n",
145                 regs->UCreg_26, regs->UCreg_25,
146                 regs->UCreg_24);
147         printk(KERN_DEFAULT "r23: %08lx  r22: %08lx  r21: %08lx  r20: %08lx\n",
148                 regs->UCreg_23, regs->UCreg_22,
149                 regs->UCreg_21, regs->UCreg_20);
150         printk(KERN_DEFAULT "r19: %08lx  r18: %08lx  r17: %08lx  r16: %08lx\n",
151                 regs->UCreg_19, regs->UCreg_18,
152                 regs->UCreg_17, regs->UCreg_16);
153         printk(KERN_DEFAULT "r15: %08lx  r14: %08lx  r13: %08lx  r12: %08lx\n",
154                 regs->UCreg_15, regs->UCreg_14,
155                 regs->UCreg_13, regs->UCreg_12);
156         printk(KERN_DEFAULT "r11: %08lx  r10: %08lx  r9 : %08lx  r8 : %08lx\n",
157                 regs->UCreg_11, regs->UCreg_10,
158                 regs->UCreg_09, regs->UCreg_08);
159         printk(KERN_DEFAULT "r7 : %08lx  r6 : %08lx  r5 : %08lx  r4 : %08lx\n",
160                 regs->UCreg_07, regs->UCreg_06,
161                 regs->UCreg_05, regs->UCreg_04);
162         printk(KERN_DEFAULT "r3 : %08lx  r2 : %08lx  r1 : %08lx  r0 : %08lx\n",
163                 regs->UCreg_03, regs->UCreg_02,
164                 regs->UCreg_01, regs->UCreg_00);
165 
166         flags = regs->UCreg_asr;
167         buf[0] = flags & PSR_S_BIT ? 'S' : 's';
168         buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z';
169         buf[2] = flags & PSR_C_BIT ? 'C' : 'c';
170         buf[3] = flags & PSR_V_BIT ? 'V' : 'v';
171         buf[4] = '\0';
172 
173         printk(KERN_DEFAULT "Flags: %s  INTR o%s  REAL o%s  Mode %s  Segment %s\n",
174                 buf, interrupts_enabled(regs) ? "n" : "ff",
175                 fast_interrupts_enabled(regs) ? "n" : "ff",
176                 processor_modes[processor_mode(regs)],
177                 segment_eq(get_fs(), get_ds()) ? "kernel" : "user");
178         {
179                 unsigned int ctrl;
180 
181                 buf[0] = '\0';
182                 {
183                         unsigned int transbase;
184                         asm("movc %0, p0.c2, #0\n"
185                             : "=r" (transbase));
186                         snprintf(buf, sizeof(buf), "  Table: %08x", transbase);
187                 }
188                 asm("movc %0, p0.c1, #0\n" : "=r" (ctrl));
189 
190                 printk(KERN_DEFAULT "Control: %08x%s\n", ctrl, buf);
191         }
192 }
193 
194 void show_regs(struct pt_regs *regs)
195 {
196         printk(KERN_DEFAULT "\n");
197         printk(KERN_DEFAULT "Pid: %d, comm: %20s\n",
198                         task_pid_nr(current), current->comm);
199         __show_regs(regs);
200         __backtrace();
201 }
202 
203 /*
204  * Free current thread data structures etc..
205  */
206 void exit_thread(void)
207 {
208 }
209 
210 void flush_thread(void)
211 {
212         struct thread_info *thread = current_thread_info();
213         struct task_struct *tsk = current;
214 
215         memset(thread->used_cp, 0, sizeof(thread->used_cp));
216         memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
217 #ifdef CONFIG_UNICORE_FPU_F64
218         memset(&thread->fpstate, 0, sizeof(struct fp_state));
219 #endif
220 }
221 
222 void release_thread(struct task_struct *dead_task)
223 {
224 }
225 
226 asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
227 asmlinkage void ret_from_kernel_thread(void) __asm__("ret_from_kernel_thread");
228 
229 int
230 copy_thread(unsigned long clone_flags, unsigned long stack_start,
231             unsigned long stk_sz, struct task_struct *p)
232 {
233         struct thread_info *thread = task_thread_info(p);
234         struct pt_regs *childregs = task_pt_regs(p);
235 
236         memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
237         thread->cpu_context.sp = (unsigned long)childregs;
238         if (unlikely(p->flags & PF_KTHREAD)) {
239                 thread->cpu_context.pc = (unsigned long)ret_from_kernel_thread;
240                 thread->cpu_context.r4 = stack_start;
241                 thread->cpu_context.r5 = stk_sz;
242                 memset(childregs, 0, sizeof(struct pt_regs));
243         } else {
244                 thread->cpu_context.pc = (unsigned long)ret_from_fork;
245                 *childregs = *current_pt_regs();
246                 childregs->UCreg_00 = 0;
247                 if (stack_start)
248                         childregs->UCreg_sp = stack_start;
249 
250                 if (clone_flags & CLONE_SETTLS)
251                         childregs->UCreg_16 = childregs->UCreg_03;
252         }
253         return 0;
254 }
255 
256 /*
257  * Fill in the task's elfregs structure for a core dump.
258  */
259 int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs)
260 {
261         elf_core_copy_regs(elfregs, task_pt_regs(t));
262         return 1;
263 }
264 
265 /*
266  * fill in the fpe structure for a core dump...
267  */
268 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fp)
269 {
270         struct thread_info *thread = current_thread_info();
271         int used_math = thread->used_cp[1] | thread->used_cp[2];
272 
273 #ifdef CONFIG_UNICORE_FPU_F64
274         if (used_math)
275                 memcpy(fp, &thread->fpstate, sizeof(*fp));
276 #endif
277         return used_math != 0;
278 }
279 EXPORT_SYMBOL(dump_fpu);
280 
281 unsigned long get_wchan(struct task_struct *p)
282 {
283         struct stackframe frame;
284         int count = 0;
285         if (!p || p == current || p->state == TASK_RUNNING)
286                 return 0;
287 
288         frame.fp = thread_saved_fp(p);
289         frame.sp = thread_saved_sp(p);
290         frame.lr = 0;                   /* recovered from the stack */
291         frame.pc = thread_saved_pc(p);
292         do {
293                 int ret = unwind_frame(&frame);
294                 if (ret < 0)
295                         return 0;
296                 if (!in_sched_functions(frame.pc))
297                         return frame.pc;
298         } while ((count++) < 16);
299         return 0;
300 }
301 
302 unsigned long arch_randomize_brk(struct mm_struct *mm)
303 {
304         unsigned long range_end = mm->brk + 0x02000000;
305         return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
306 }
307 
308 /*
309  * The vectors page is always readable from user space for the
310  * atomic helpers and the signal restart code.  Let's declare a mapping
311  * for it so it is visible through ptrace and /proc/<pid>/mem.
312  */
313 
314 int vectors_user_mapping(void)
315 {
316         struct mm_struct *mm = current->mm;
317         return install_special_mapping(mm, 0xffff0000, PAGE_SIZE,
318                                        VM_READ | VM_EXEC |
319                                        VM_MAYREAD | VM_MAYEXEC |
320                                        VM_DONTEXPAND | VM_DONTDUMP,
321                                        NULL);
322 }
323 
324 const char *arch_vma_name(struct vm_area_struct *vma)
325 {
326         return (vma->vm_start == 0xffff0000) ? "[vectors]" : NULL;
327 }
328 

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