initial_commit

1 files changed, 626 insertions, 0 deletions

diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
new file mode 100644
index 00000000..300649c7
--- /dev/null
+++ b/arch/arm/kernel/process.c
@@ -0,0 +1,626 @@
+/*
+ *  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/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/console.h>
+
+#include <asm/cacheflush.h>
+#include <asm/processor.h>
+#include <asm/system.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(char mode);
+
+static volatile int hlt_counter;
+
+#include <mach/system.h>
+
+#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);
+
+#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
+
+void arm_machine_restart(char mode, const char *cmd)
+{
+	/* Flush the console to make sure all the relevant messages make it
+	 * out to the console drivers */
+	arm_machine_flush_console();
+
+	/* Disable interrupts first */
+	local_irq_disable();
+	local_fiq_disable();
+
+	/*
+	 * 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);
+
+	/* 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();
+
+	/*
+	 * Now call the architecture specific reboot code.
+	 */
+	arch_reset(mode, cmd);
+
+	/*
+	 * 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_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
+
+void (*arm_pm_restart)(char str, const char *cmd) = arm_machine_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.  We need to disable
+ * interrupts here to ensure we don't miss a wakeup call.
+ */
+static void default_idle(void)
+{
+	if (!need_resched())
+		arch_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_stop_sched_tick(1);
+		while (!need_resched()) {
+#ifdef CONFIG_HOTPLUG_CPU
+			if (cpu_is_offline(smp_processor_id()))
+				cpu_die();
+#endif
+
+			local_irq_disable();
+#ifdef CONFIG_PL310_ERRATA_769419
+			wmb();
+#endif
+			if (hlt_counter || tick_check_broadcast_pending()) {
+				local_irq_enable();
+				cpu_relax();
+			} else {
+				stop_critical_timings();
+				pm_idle();
+				start_critical_timings();
+				/*
+				 * This will eventually be removed - pm_idle
+				 * functions should always return with IRQs
+				 * enabled.
+				 */
+				WARN_ON(irqs_disabled());
+				local_irq_enable();
+			}
+		}
+		tick_nohz_restart_sched_tick();
+		idle_notifier_call_chain(IDLE_END);
+		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_shutdown(void)
+{
+#ifdef CONFIG_SMP
+	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();
+	arm_pm_restart(reboot_mode, cmd);
+}
+
+/*
+ * 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);
+	__backtrace();
+}
+
+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(&regs, 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, &regs, 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.  Let's declare a mapping
+ * for it so it is visible through ptrace and /proc/<pid>/mem.
+ */
+
+int vectors_user_mapping(void)
+{
+	struct mm_struct *mm = current->mm;
+	return install_special_mapping(mm, 0xffff0000, PAGE_SIZE,
+				       VM_READ | VM_EXEC |
+				       VM_MAYREAD | VM_MAYEXEC |
+				       VM_ALWAYSDUMP | VM_RESERVED,
+				       NULL);
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+	return (vma->vm_start == 0xffff0000) ? "[vectors]" : NULL;
+}
+#endif