| /* |
| * linux/arch/arm/kernel/process.c |
| * |
| * Copyright (C) 1996-2000 Russell King - Converted to ARM. |
| * Original Copyright (C) 1995 Linus Torvalds |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <stdarg.h> |
| |
| #include <linux/module.h> |
| #include <linux/sched.h> |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/stddef.h> |
| #include <linux/unistd.h> |
| #include <linux/slab.h> |
| #include <linux/user.h> |
| #include <linux/a.out.h> |
| #include <linux/delay.h> |
| #include <linux/reboot.h> |
| #include <linux/interrupt.h> |
| #include <linux/kallsyms.h> |
| #include <linux/init.h> |
| #include <linux/cpu.h> |
| #include <linux/elfcore.h> |
| #include <linux/pm.h> |
| #include <linux/tick.h> |
| |
| #include <asm/leds.h> |
| #include <asm/processor.h> |
| #include <asm/system.h> |
| #include <asm/thread_notify.h> |
| #include <asm/uaccess.h> |
| #include <asm/mach/time.h> |
| |
| static const char *processor_modes[] = { |
| "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" , |
| "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26", |
| "USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" , |
| "UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32" |
| }; |
| |
| extern void setup_mm_for_reboot(char mode); |
| |
| static volatile int hlt_counter; |
| |
| #include <asm/arch/system.h> |
| |
| void disable_hlt(void) |
| { |
| hlt_counter++; |
| } |
| |
| EXPORT_SYMBOL(disable_hlt); |
| |
| void enable_hlt(void) |
| { |
| hlt_counter--; |
| } |
| |
| EXPORT_SYMBOL(enable_hlt); |
| |
| static int __init nohlt_setup(char *__unused) |
| { |
| hlt_counter = 1; |
| return 1; |
| } |
| |
| static int __init hlt_setup(char *__unused) |
| { |
| hlt_counter = 0; |
| return 1; |
| } |
| |
| __setup("nohlt", nohlt_setup); |
| __setup("hlt", hlt_setup); |
| |
| void arm_machine_restart(char mode) |
| { |
| /* |
| * Clean and disable cache, and turn off interrupts |
| */ |
| cpu_proc_fin(); |
| |
| /* |
| * Tell the mm system that we are going to reboot - |
| * we may need it to insert some 1:1 mappings so that |
| * soft boot works. |
| */ |
| setup_mm_for_reboot(mode); |
| |
| /* |
| * Now call the architecture specific reboot code. |
| */ |
| arch_reset(mode); |
| |
| /* |
| * Whoops - the architecture was unable to reboot. |
| * Tell the user! |
| */ |
| mdelay(1000); |
| printk("Reboot failed -- System halted\n"); |
| while (1); |
| } |
| |
| /* |
| * Function pointers to optional machine specific functions |
| */ |
| void (*pm_idle)(void); |
| EXPORT_SYMBOL(pm_idle); |
| |
| void (*pm_power_off)(void); |
| EXPORT_SYMBOL(pm_power_off); |
| |
| void (*arm_pm_restart)(char str) = arm_machine_restart; |
| EXPORT_SYMBOL_GPL(arm_pm_restart); |
| |
| |
| /* |
| * This is our default idle handler. We need to disable |
| * interrupts here to ensure we don't miss a wakeup call. |
| */ |
| static void default_idle(void) |
| { |
| if (hlt_counter) |
| cpu_relax(); |
| else { |
| local_irq_disable(); |
| if (!need_resched()) { |
| timer_dyn_reprogram(); |
| arch_idle(); |
| } |
| local_irq_enable(); |
| } |
| } |
| |
| /* |
| * The idle thread. We try to conserve power, while trying to keep |
| * overall latency low. The architecture specific idle is passed |
| * a value to indicate the level of "idleness" of the system. |
| */ |
| void cpu_idle(void) |
| { |
| local_fiq_enable(); |
| |
| /* endless idle loop with no priority at all */ |
| while (1) { |
| void (*idle)(void) = pm_idle; |
| |
| #ifdef CONFIG_HOTPLUG_CPU |
| if (cpu_is_offline(smp_processor_id())) { |
| leds_event(led_idle_start); |
| cpu_die(); |
| } |
| #endif |
| |
| if (!idle) |
| idle = default_idle; |
| leds_event(led_idle_start); |
| tick_nohz_stop_sched_tick(); |
| while (!need_resched()) |
| idle(); |
| leds_event(led_idle_end); |
| tick_nohz_restart_sched_tick(); |
| preempt_enable_no_resched(); |
| schedule(); |
| preempt_disable(); |
| } |
| } |
| |
| static char reboot_mode = 'h'; |
| |
| int __init reboot_setup(char *str) |
| { |
| reboot_mode = str[0]; |
| return 1; |
| } |
| |
| __setup("reboot=", reboot_setup); |
| |
| void machine_halt(void) |
| { |
| } |
| |
| |
| void machine_power_off(void) |
| { |
| if (pm_power_off) |
| pm_power_off(); |
| } |
| |
| void machine_restart(char * __unused) |
| { |
| arm_pm_restart(reboot_mode); |
| } |
| |
| void __show_regs(struct pt_regs *regs) |
| { |
| unsigned long flags = condition_codes(regs); |
| |
| printk("CPU: %d\n", smp_processor_id()); |
| print_symbol("PC is at %s\n", instruction_pointer(regs)); |
| print_symbol("LR is at %s\n", regs->ARM_lr); |
| printk("pc : [<%08lx>] lr : [<%08lx>] %s\n" |
| "sp : %08lx ip : %08lx fp : %08lx\n", |
| instruction_pointer(regs), |
| regs->ARM_lr, print_tainted(), regs->ARM_sp, |
| regs->ARM_ip, regs->ARM_fp); |
| printk("r10: %08lx r9 : %08lx r8 : %08lx\n", |
| regs->ARM_r10, regs->ARM_r9, |
| regs->ARM_r8); |
| printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", |
| regs->ARM_r7, regs->ARM_r6, |
| regs->ARM_r5, regs->ARM_r4); |
| printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", |
| regs->ARM_r3, regs->ARM_r2, |
| regs->ARM_r1, regs->ARM_r0); |
| printk("Flags: %c%c%c%c", |
| flags & PSR_N_BIT ? 'N' : 'n', |
| flags & PSR_Z_BIT ? 'Z' : 'z', |
| flags & PSR_C_BIT ? 'C' : 'c', |
| flags & PSR_V_BIT ? 'V' : 'v'); |
| printk(" IRQs o%s FIQs o%s Mode %s%s Segment %s\n", |
| interrupts_enabled(regs) ? "n" : "ff", |
| fast_interrupts_enabled(regs) ? "n" : "ff", |
| processor_modes[processor_mode(regs)], |
| thumb_mode(regs) ? " (T)" : "", |
| get_fs() == get_ds() ? "kernel" : "user"); |
| #if CONFIG_CPU_CP15 |
| { |
| unsigned int ctrl; |
| __asm__ ( |
| " mrc p15, 0, %0, c1, c0\n" |
| : "=r" (ctrl)); |
| printk("Control: %04X\n", ctrl); |
| } |
| #ifdef CONFIG_CPU_CP15_MMU |
| { |
| unsigned int transbase, dac; |
| __asm__ ( |
| " mrc p15, 0, %0, c2, c0\n" |
| " mrc p15, 0, %1, c3, c0\n" |
| : "=r" (transbase), "=r" (dac)); |
| printk("Table: %08X DAC: %08X\n", |
| transbase, dac); |
| } |
| #endif |
| #endif |
| } |
| |
| void show_regs(struct pt_regs * regs) |
| { |
| printk("\n"); |
| printk("Pid: %d, comm: %20s\n", current->pid, current->comm); |
| __show_regs(regs); |
| __backtrace(); |
| } |
| |
| void show_fpregs(struct user_fp *regs) |
| { |
| int i; |
| |
| for (i = 0; i < 8; i++) { |
| unsigned long *p; |
| char type; |
| |
| p = (unsigned long *)(regs->fpregs + i); |
| |
| switch (regs->ftype[i]) { |
| case 1: type = 'f'; break; |
| case 2: type = 'd'; break; |
| case 3: type = 'e'; break; |
| default: type = '?'; break; |
| } |
| if (regs->init_flag) |
| type = '?'; |
| |
| printk(" f%d(%c): %08lx %08lx %08lx%c", |
| i, type, p[0], p[1], p[2], i & 1 ? '\n' : ' '); |
| } |
| |
| |
| printk("FPSR: %08lx FPCR: %08lx\n", |
| (unsigned long)regs->fpsr, |
| (unsigned long)regs->fpcr); |
| } |
| |
| /* |
| * Free current thread data structures etc.. |
| */ |
| void exit_thread(void) |
| { |
| } |
| |
| ATOMIC_NOTIFIER_HEAD(thread_notify_head); |
| |
| EXPORT_SYMBOL_GPL(thread_notify_head); |
| |
| void flush_thread(void) |
| { |
| struct thread_info *thread = current_thread_info(); |
| struct task_struct *tsk = current; |
| |
| memset(thread->used_cp, 0, sizeof(thread->used_cp)); |
| memset(&tsk->thread.debug, 0, sizeof(struct debug_info)); |
| memset(&thread->fpstate, 0, sizeof(union fp_state)); |
| |
| thread_notify(THREAD_NOTIFY_FLUSH, thread); |
| } |
| |
| void release_thread(struct task_struct *dead_task) |
| { |
| struct thread_info *thread = task_thread_info(dead_task); |
| |
| thread_notify(THREAD_NOTIFY_RELEASE, thread); |
| } |
| |
| asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); |
| |
| int |
| copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start, |
| unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs) |
| { |
| struct thread_info *thread = task_thread_info(p); |
| struct pt_regs *childregs = task_pt_regs(p); |
| |
| *childregs = *regs; |
| childregs->ARM_r0 = 0; |
| childregs->ARM_sp = stack_start; |
| |
| memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save)); |
| thread->cpu_context.sp = (unsigned long)childregs; |
| thread->cpu_context.pc = (unsigned long)ret_from_fork; |
| |
| if (clone_flags & CLONE_SETTLS) |
| thread->tp_value = regs->ARM_r3; |
| |
| return 0; |
| } |
| |
| /* |
| * fill in the fpe structure for a core dump... |
| */ |
| int dump_fpu (struct pt_regs *regs, struct user_fp *fp) |
| { |
| struct thread_info *thread = current_thread_info(); |
| int used_math = thread->used_cp[1] | thread->used_cp[2]; |
| |
| if (used_math) |
| memcpy(fp, &thread->fpstate.soft, sizeof (*fp)); |
| |
| return used_math != 0; |
| } |
| EXPORT_SYMBOL(dump_fpu); |
| |
| /* |
| * fill in the user structure for a core dump.. |
| */ |
| void dump_thread(struct pt_regs * regs, struct user * dump) |
| { |
| struct task_struct *tsk = current; |
| |
| dump->magic = CMAGIC; |
| dump->start_code = tsk->mm->start_code; |
| dump->start_stack = regs->ARM_sp & ~(PAGE_SIZE - 1); |
| |
| dump->u_tsize = (tsk->mm->end_code - tsk->mm->start_code) >> PAGE_SHIFT; |
| dump->u_dsize = (tsk->mm->brk - tsk->mm->start_data + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| dump->u_ssize = 0; |
| |
| dump->u_debugreg[0] = tsk->thread.debug.bp[0].address; |
| dump->u_debugreg[1] = tsk->thread.debug.bp[1].address; |
| dump->u_debugreg[2] = tsk->thread.debug.bp[0].insn.arm; |
| dump->u_debugreg[3] = tsk->thread.debug.bp[1].insn.arm; |
| dump->u_debugreg[4] = tsk->thread.debug.nsaved; |
| |
| if (dump->start_stack < 0x04000000) |
| dump->u_ssize = (0x04000000 - dump->start_stack) >> PAGE_SHIFT; |
| |
| dump->regs = *regs; |
| dump->u_fpvalid = dump_fpu (regs, &dump->u_fp); |
| } |
| EXPORT_SYMBOL(dump_thread); |
| |
| /* |
| * Shuffle the argument into the correct register before calling the |
| * thread function. r1 is the thread argument, r2 is the pointer to |
| * the thread function, and r3 points to the exit function. |
| */ |
| extern void kernel_thread_helper(void); |
| asm( ".section .text\n" |
| " .align\n" |
| " .type kernel_thread_helper, #function\n" |
| "kernel_thread_helper:\n" |
| " mov r0, r1\n" |
| " mov lr, r3\n" |
| " mov pc, r2\n" |
| " .size kernel_thread_helper, . - kernel_thread_helper\n" |
| " .previous"); |
| |
| /* |
| * Create a kernel thread. |
| */ |
| pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) |
| { |
| struct pt_regs regs; |
| |
| memset(®s, 0, sizeof(regs)); |
| |
| regs.ARM_r1 = (unsigned long)arg; |
| regs.ARM_r2 = (unsigned long)fn; |
| regs.ARM_r3 = (unsigned long)do_exit; |
| regs.ARM_pc = (unsigned long)kernel_thread_helper; |
| regs.ARM_cpsr = SVC_MODE; |
| |
| return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL); |
| } |
| EXPORT_SYMBOL(kernel_thread); |
| |
| unsigned long get_wchan(struct task_struct *p) |
| { |
| unsigned long fp, lr; |
| unsigned long stack_start, stack_end; |
| int count = 0; |
| if (!p || p == current || p->state == TASK_RUNNING) |
| return 0; |
| |
| stack_start = (unsigned long)end_of_stack(p); |
| stack_end = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
| |
| fp = thread_saved_fp(p); |
| do { |
| if (fp < stack_start || fp > stack_end) |
| return 0; |
| lr = pc_pointer (((unsigned long *)fp)[-1]); |
| if (!in_sched_functions(lr)) |
| return lr; |
| fp = *(unsigned long *) (fp - 12); |
| } while (count ++ < 16); |
| return 0; |
| } |