+++ /dev/null
-/*
- * linux/arch/arm26/kernel/process.c
- *
- * Copyright (C) 2003 Ian Molton - adapted for ARM26
- * Copyright (C) 1996-2000 Russell King - Converted to ARM.
- * Origional 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/ptrace.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/init.h>
-
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/leds.h>
-#include <asm/processor.h>
-#include <asm/uaccess.h>
-
-extern const char *processor_modes[];
-extern void setup_mm_for_reboot(char mode);
-
-static volatile int hlt_counter;
-
-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);
-
-/*
- * This is our default idle handler. We need to disable
- * interrupts here to ensure we don't miss a wakeup call.
- */
-void cpu_idle(void)
-{
- /* endless idle loop with no priority at all */
- while (1) {
- while (!need_resched())
- cpu_relax();
- 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);
-
-/* ARM26 cant do these but we still need to define them. */
-void machine_halt(void)
-{
-}
-void machine_power_off(void)
-{
-}
-
-void machine_restart(char * __unused)
-{
- /*
- * 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(reboot_mode);
-
- /*
- * copy branch instruction to reset location and call it
- */
-
- *(unsigned long *)0 = *(unsigned long *)0x03800000;
- ((void(*)(void))0)();
-
- /*
- * Whoops - the architecture was unable to reboot.
- * Tell the user! Should never happen...
- */
- mdelay(1000);
- printk("Reboot failed -- System halted\n");
- while (1);
-}
-
-void show_regs(struct pt_regs * regs)
-{
- unsigned long flags;
-
- flags = condition_codes(regs);
-
- 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 Segment %s\n",
- interrupts_enabled(regs) ? "n" : "ff",
- fast_interrupts_enabled(regs) ? "n" : "ff",
- processor_modes[processor_mode(regs)],
- get_fs() == get_ds() ? "kernel" : "user");
-}
-
-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);
-}
-
-/*
- * Task structure and kernel stack allocation.
- */
-static unsigned long *thread_info_head;
-static unsigned int nr_thread_info;
-
-extern unsigned long get_page_8k(int priority);
-extern void free_page_8k(unsigned long page);
-
-// FIXME - is this valid?
-#define EXTRA_TASK_STRUCT 0
-#define ll_alloc_task_struct() ((struct thread_info *)get_page_8k(GFP_KERNEL))
-#define ll_free_task_struct(p) free_page_8k((unsigned long)(p))
-
-//FIXME - do we use *task param below looks like we dont, which is ok?
-//FIXME - if EXTRA_TASK_STRUCT is zero we can optimise the below away permanently. *IF* its supposed to be zero.
-struct thread_info *alloc_thread_info(struct task_struct *task)
-{
- struct thread_info *thread = NULL;
-
- if (EXTRA_TASK_STRUCT) {
- unsigned long *p = thread_info_head;
-
- if (p) {
- thread_info_head = (unsigned long *)p[0];
- nr_thread_info -= 1;
- }
- thread = (struct thread_info *)p;
- }
-
- if (!thread)
- thread = ll_alloc_task_struct();
-
-#ifdef CONFIG_MAGIC_SYSRQ
- /*
- * The stack must be cleared if you want SYSRQ-T to
- * give sensible stack usage information
- */
- if (thread) {
- char *p = (char *)thread;
- memzero(p+KERNEL_STACK_SIZE, KERNEL_STACK_SIZE);
- }
-#endif
- return thread;
-}
-
-void free_thread_info(struct thread_info *thread)
-{
- if (EXTRA_TASK_STRUCT && nr_thread_info < EXTRA_TASK_STRUCT) {
- unsigned long *p = (unsigned long *)thread;
- p[0] = (unsigned long)thread_info_head;
- thread_info_head = p;
- nr_thread_info += 1;
- } else
- ll_free_task_struct(thread);
-}
-
-/*
- * Free current thread data structures etc..
- */
-void exit_thread(void)
-{
-}
-
-void flush_thread(void)
-{
- struct thread_info *thread = current_thread_info();
- struct task_struct *tsk = current;
-
- memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
- memset(&thread->fpstate, 0, sizeof(union fp_state));
-
- clear_used_math();
-}
-
-void release_thread(struct task_struct *dead_task)
-{
-}
-
-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 unused, 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 | MODE_SVC26 | PSR_I_BIT;
-
- 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 = !!used_math();
-
- if (used_math)
- memcpy(fp, &thread->fpstate.soft, sizeof (*fp));
-
- return used_math;
-}
-
-/*
- * 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;
- dump->u_debugreg[3] = tsk->thread.debug.bp[1].insn;
- 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);
-}
-
-/*
- * 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.
- * FIXME - make sure this is right - the older code used to zero fp
- * and cause the parent to call sys_exit (do_exit in this version)
- */
-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 | MODE_SVC26;
-
- 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_page;
- int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
- return 0;
-
- stack_page = 4096 + (unsigned long)p;
- fp = thread_saved_fp(p);
- do {
- if (fp < stack_page || fp > 4092+stack_page)
- 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;
-}
git.openpandora.org / pandora-kernel.git / blobdiff