diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/kernel/process.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/kernel/process.c | 704 |
1 files changed, 0 insertions, 704 deletions
diff --git a/ANDROID_3.4.5/arch/arm/kernel/process.c b/ANDROID_3.4.5/arch/arm/kernel/process.c deleted file mode 100644 index df0dec8e..00000000 --- a/ANDROID_3.4.5/arch/arm/kernel/process.c +++ /dev/null @@ -1,704 +0,0 @@ -/* - * 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/export.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/stddef.h> -#include <linux/unistd.h> -#include <linux/user.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 <linux/utsname.h> -#include <linux/uaccess.h> -#include <linux/random.h> -#include <linux/hw_breakpoint.h> -#include <linux/cpuidle.h> -#include <linux/console.h> - -#include <asm/cacheflush.h> -#include <asm/processor.h> -#include <asm/thread_notify.h> -#include <asm/stacktrace.h> -#include <asm/mach/time.h> - -#ifdef CONFIG_CC_STACKPROTECTOR -#include <linux/stackprotector.h> -unsigned long __stack_chk_guard __read_mostly; -EXPORT_SYMBOL(__stack_chk_guard); -#endif - -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" -}; - -static const char *isa_modes[] = { - "ARM" , "Thumb" , "Jazelle", "ThumbEE" -}; - -extern void setup_mm_for_reboot(void); - -static volatile int hlt_counter; - -#ifdef CONFIG_SMP -void arch_trigger_all_cpu_backtrace(void) -{ - smp_send_all_cpu_backtrace(); -} -#else -void arch_trigger_all_cpu_backtrace(void) -{ - dump_stack(); -} -#endif - -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); - -extern void call_with_stack(void (*fn)(void *), void *arg, void *sp); -typedef void (*phys_reset_t)(unsigned long); - -#ifdef CONFIG_ARM_FLUSH_CONSOLE_ON_RESTART -void arm_machine_flush_console(void) -{ - printk("\n"); - pr_emerg("Restarting %s\n", linux_banner); - if (console_trylock()) { - console_unlock(); - return; - } - - mdelay(50); - - local_irq_disable(); - if (!console_trylock()) - pr_emerg("arm_restart: Console was locked! Busting\n"); - else - pr_emerg("arm_restart: Console was locked!\n"); - console_unlock(); -} -#else -void arm_machine_flush_console(void) -{ -} -#endif - -/* - * A temporary stack to use for CPU reset. This is static so that we - * don't clobber it with the identity mapping. When running with this - * stack, any references to the current task *will not work* so you - * should really do as little as possible before jumping to your reset - * code. - */ -static u64 soft_restart_stack[16]; - -static void __soft_restart(void *addr) -{ - phys_reset_t phys_reset; - - /* Take out a flat memory mapping. */ - setup_mm_for_reboot(); - - /* Clean and invalidate caches */ - flush_cache_all(); - - /* Turn off caching */ - cpu_proc_fin(); - - /* Push out any further dirty data, and ensure cache is empty */ - flush_cache_all(); - - /* Switch to the identity mapping. */ - phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset); - phys_reset((unsigned long)addr); - - /* Should never get here. */ - BUG(); -} - -void soft_restart_noirq(unsigned long addr)/*add by roger.*/
-{
- u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack);
-
- /* Disable the L2 if we're the last man standing. */
- if (num_online_cpus() == 1)
- outer_disable();
-
- /* Change to the new stack and continue with the reset. */
- call_with_stack(__soft_restart, (void *)addr, (void *)stack);
-
- /* Should never get here. */
- BUG();
-} - -void soft_restart(unsigned long addr) -{ - u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack); - - /* Disable interrupts first */ - local_irq_disable(); - local_fiq_disable(); - - /* Disable the L2 if we're the last man standing. */ - if (num_online_cpus() == 1) - outer_disable(); - - /* Change to the new stack and continue with the reset. */ - call_with_stack(__soft_restart, (void *)addr, (void *)stack); - - /* Should never get here. */ - BUG(); -} - -static void null_restart(char mode, const char *cmd) -{ -} - -/* - * Function pointers to optional machine specific functions - */ -void (*pm_power_off)(void); -EXPORT_SYMBOL(pm_power_off); - -void (*arm_pm_restart)(char str, const char *cmd) = null_restart; -EXPORT_SYMBOL_GPL(arm_pm_restart); - -static void do_nothing(void *unused) -{ -} - -/* - * cpu_idle_wait - Used to ensure that all the CPUs discard old value of - * pm_idle and update to new pm_idle value. Required while changing pm_idle - * handler on SMP systems. - * - * Caller must have changed pm_idle to the new value before the call. Old - * pm_idle value will not be used by any CPU after the return of this function. - */ -void cpu_idle_wait(void) -{ - smp_mb(); - /* kick all the CPUs so that they exit out of pm_idle */ - smp_call_function(do_nothing, NULL, 1); -} -EXPORT_SYMBOL_GPL(cpu_idle_wait); - -/* - * This is our default idle handler. - */ - -void (*arm_pm_idle)(void); - -static void default_idle(void) -{ - if (arm_pm_idle) - arm_pm_idle(); - else - cpu_do_idle(); - local_irq_enable(); -} - -void (*pm_idle)(void) = default_idle; -EXPORT_SYMBOL(pm_idle); - -/* - * The idle thread, has rather strange semantics for calling pm_idle, - * but this is what x86 does and we need to do the same, so that - * things like cpuidle get called in the same way. The only difference - * is that we always respect 'hlt_counter' to prevent low power idle. - */ -void cpu_idle(void) -{ - local_fiq_enable(); - - /* endless idle loop with no priority at all */ - while (1) { - idle_notifier_call_chain(IDLE_START); - tick_nohz_idle_enter(); - rcu_idle_enter(); - while (!need_resched()) { -#ifdef CONFIG_HOTPLUG_CPU - if (cpu_is_offline(smp_processor_id())) - cpu_die(); -#endif - - /* - * We need to disable interrupts here - * to ensure we don't miss a wakeup call. - */ - local_irq_disable(); -#ifdef CONFIG_PL310_ERRATA_769419 - wmb(); -#endif - if (hlt_counter) { - local_irq_enable(); - cpu_relax(); - } else if (!need_resched()) { - stop_critical_timings(); - if (cpuidle_idle_call()) - pm_idle(); - start_critical_timings(); - /* - * pm_idle functions must always - * return with IRQs enabled. - */ - WARN_ON(irqs_disabled()); - } else - local_irq_enable(); - } - rcu_idle_exit(); - tick_nohz_idle_exit(); - idle_notifier_call_chain(IDLE_END); - schedule_preempt_disabled(); - } -} - -static char reboot_mode = 'h'; - -int __init reboot_setup(char *str) -{ - reboot_mode = str[0]; - return 1; -} - -__setup("reboot=", reboot_setup); - -void machine_shutdown(void) -{ -#ifdef CONFIG_SMP - /* - * Disable preemption so we're guaranteed to - * run to power off or reboot and prevent - * the possibility of switching to another - * thread that might wind up blocking on - * one of the stopped CPUs. - */ - preempt_disable(); - - smp_send_stop(); -#endif -} - -void machine_halt(void) -{ - machine_shutdown(); - while (1); -} - -void machine_power_off(void) -{ - machine_shutdown(); - if (pm_power_off) - pm_power_off(); -} - -void machine_restart(char *cmd) -{ - machine_shutdown(); - - /* Flush the console to make sure all the relevant messages make it - * out to the console drivers */ - arm_machine_flush_console(); - - arm_pm_restart(reboot_mode, cmd); - - /* Give a grace period for failure to restart of 1s */ - mdelay(1000); - - /* Whoops - the platform was unable to reboot. Tell the user! */ - printk("Reboot failed -- System halted\n"); - while (1); -} - -/* - * dump a block of kernel memory from around the given address - */ -static void show_data(unsigned long addr, int nbytes, const char *name) -{ - int i, j; - int nlines; - u32 *p; - - /* - * don't attempt to dump non-kernel addresses or - * values that are probably just small negative numbers - */ - if (addr < PAGE_OFFSET || addr > -256UL) - return; - - printk("\n%s: %#lx:\n", name, addr); - - /* - * round address down to a 32 bit boundary - * and always dump a multiple of 32 bytes - */ - p = (u32 *)(addr & ~(sizeof(u32) - 1)); - nbytes += (addr & (sizeof(u32) - 1)); - nlines = (nbytes + 31) / 32; - - - for (i = 0; i < nlines; i++) { - /* - * just display low 16 bits of address to keep - * each line of the dump < 80 characters - */ - printk("%04lx ", (unsigned long)p & 0xffff); - for (j = 0; j < 8; j++) { - u32 data; - if (probe_kernel_address(p, data)) { - printk(" ********"); - } else { - printk(" %08x", data); - } - ++p; - } - printk("\n"); - } -} - -static void show_extra_register_data(struct pt_regs *regs, int nbytes) -{ - mm_segment_t fs; - - fs = get_fs(); - set_fs(KERNEL_DS); - show_data(regs->ARM_pc - nbytes, nbytes * 2, "PC"); - show_data(regs->ARM_lr - nbytes, nbytes * 2, "LR"); - show_data(regs->ARM_sp - nbytes, nbytes * 2, "SP"); - show_data(regs->ARM_ip - nbytes, nbytes * 2, "IP"); - show_data(regs->ARM_fp - nbytes, nbytes * 2, "FP"); - show_data(regs->ARM_r0 - nbytes, nbytes * 2, "R0"); - show_data(regs->ARM_r1 - nbytes, nbytes * 2, "R1"); - show_data(regs->ARM_r2 - nbytes, nbytes * 2, "R2"); - show_data(regs->ARM_r3 - nbytes, nbytes * 2, "R3"); - show_data(regs->ARM_r4 - nbytes, nbytes * 2, "R4"); - show_data(regs->ARM_r5 - nbytes, nbytes * 2, "R5"); - show_data(regs->ARM_r6 - nbytes, nbytes * 2, "R6"); - show_data(regs->ARM_r7 - nbytes, nbytes * 2, "R7"); - show_data(regs->ARM_r8 - nbytes, nbytes * 2, "R8"); - show_data(regs->ARM_r9 - nbytes, nbytes * 2, "R9"); - show_data(regs->ARM_r10 - nbytes, nbytes * 2, "R10"); - set_fs(fs); -} - -void __show_regs(struct pt_regs *regs) -{ - unsigned long flags; - char buf[64]; - - printk("CPU: %d %s (%s %.*s)\n", - raw_smp_processor_id(), print_tainted(), - init_utsname()->release, - (int)strcspn(init_utsname()->version, " "), - init_utsname()->version); - 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>] psr: %08lx\n" - "sp : %08lx ip : %08lx fp : %08lx\n", - regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr, - 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); - - flags = regs->ARM_cpsr; - buf[0] = flags & PSR_N_BIT ? 'N' : 'n'; - buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z'; - buf[2] = flags & PSR_C_BIT ? 'C' : 'c'; - buf[3] = flags & PSR_V_BIT ? 'V' : 'v'; - buf[4] = '\0'; - - printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n", - buf, interrupts_enabled(regs) ? "n" : "ff", - fast_interrupts_enabled(regs) ? "n" : "ff", - processor_modes[processor_mode(regs)], - isa_modes[isa_mode(regs)], - get_fs() == get_ds() ? "kernel" : "user"); -#ifdef CONFIG_CPU_CP15 - { - unsigned int ctrl; - - buf[0] = '\0'; -#ifdef CONFIG_CPU_CP15_MMU - { - unsigned int transbase, dac; - asm("mrc p15, 0, %0, c2, c0\n\t" - "mrc p15, 0, %1, c3, c0\n" - : "=r" (transbase), "=r" (dac)); - snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x", - transbase, dac); - } -#endif - asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl)); - - printk("Control: %08x%s\n", ctrl, buf); - } -#endif - - show_extra_register_data(regs, 128); -} - -void show_regs(struct pt_regs * regs) -{ - printk("\n"); - printk("Pid: %d, comm: %20s\n", task_pid_nr(current), current->comm); - __show_regs(regs); - dump_stack(); -} - -ATOMIC_NOTIFIER_HEAD(thread_notify_head); - -EXPORT_SYMBOL_GPL(thread_notify_head); - -/* - * Free current thread data structures etc.. - */ -void exit_thread(void) -{ - thread_notify(THREAD_NOTIFY_EXIT, current_thread_info()); -} - -void flush_thread(void) -{ - struct thread_info *thread = current_thread_info(); - struct task_struct *tsk = current; - - flush_ptrace_hw_breakpoint(tsk); - - 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) -{ -} - -asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); - -int -copy_thread(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; - - clear_ptrace_hw_breakpoint(p); - - if (clone_flags & CLONE_SETTLS) - thread->tp_value = regs->ARM_r3; - - thread_notify(THREAD_NOTIFY_COPY, thread); - - return 0; -} - -/* - * Fill in the task's elfregs structure for a core dump. - */ -int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs) -{ - elf_core_copy_regs(elfregs, task_pt_regs(t)); - return 1; -} - -/* - * 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); - -/* - * Shuffle the argument into the correct register before calling the - * thread function. r4 is the thread argument, r5 is the pointer to - * the thread function, and r6 points to the exit function. - */ -extern void kernel_thread_helper(void); -asm( ".pushsection .text\n" -" .align\n" -" .type kernel_thread_helper, #function\n" -"kernel_thread_helper:\n" -#ifdef CONFIG_TRACE_IRQFLAGS -" bl trace_hardirqs_on\n" -#endif -" msr cpsr_c, r7\n" -" mov r0, r4\n" -" mov lr, r6\n" -" mov pc, r5\n" -" .size kernel_thread_helper, . - kernel_thread_helper\n" -" .popsection"); - -#ifdef CONFIG_ARM_UNWIND -extern void kernel_thread_exit(long code); -asm( ".pushsection .text\n" -" .align\n" -" .type kernel_thread_exit, #function\n" -"kernel_thread_exit:\n" -" .fnstart\n" -" .cantunwind\n" -" bl do_exit\n" -" nop\n" -" .fnend\n" -" .size kernel_thread_exit, . - kernel_thread_exit\n" -" .popsection"); -#else -#define kernel_thread_exit do_exit -#endif - -/* - * 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_r4 = (unsigned long)arg; - regs.ARM_r5 = (unsigned long)fn; - regs.ARM_r6 = (unsigned long)kernel_thread_exit; - regs.ARM_r7 = SVC_MODE | PSR_ENDSTATE | PSR_ISETSTATE; - regs.ARM_pc = (unsigned long)kernel_thread_helper; - regs.ARM_cpsr = regs.ARM_r7 | PSR_I_BIT; - - 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) -{ - struct stackframe frame; - int count = 0; - if (!p || p == current || p->state == TASK_RUNNING) - return 0; - - frame.fp = thread_saved_fp(p); - frame.sp = thread_saved_sp(p); - frame.lr = 0; /* recovered from the stack */ - frame.pc = thread_saved_pc(p); - do { - int ret = unwind_frame(&frame); - if (ret < 0) - return 0; - if (!in_sched_functions(frame.pc)) - return frame.pc; - } while (count ++ < 16); - return 0; -} - -unsigned long arch_randomize_brk(struct mm_struct *mm) -{ - unsigned long range_end = mm->brk + 0x02000000; - return randomize_range(mm->brk, range_end, 0) ? : mm->brk; -} - -#ifdef CONFIG_MMU -/* - * The vectors page is always readable from user space for the - * atomic helpers and the signal restart code. Insert it into the - * gate_vma so that it is visible through ptrace and /proc/<pid>/mem. - */ -static struct vm_area_struct gate_vma; - -static int __init gate_vma_init(void) -{ - gate_vma.vm_start = 0xffff0000; - gate_vma.vm_end = 0xffff0000 + PAGE_SIZE; - gate_vma.vm_page_prot = PAGE_READONLY_EXEC; - gate_vma.vm_flags = VM_READ | VM_EXEC | - VM_MAYREAD | VM_MAYEXEC; - return 0; -} -arch_initcall(gate_vma_init); - -struct vm_area_struct *get_gate_vma(struct mm_struct *mm) -{ - return &gate_vma; -} - -int in_gate_area(struct mm_struct *mm, unsigned long addr) -{ - return (addr >= gate_vma.vm_start) && (addr < gate_vma.vm_end); -} - -int in_gate_area_no_mm(unsigned long addr) -{ - return in_gate_area(NULL, addr); -} - -const char *arch_vma_name(struct vm_area_struct *vma) -{ - return (vma == &gate_vma) ? "[vectors]" : NULL; -} -#endif |