LXR linux/arch/m32r/kernel/process.c

   1/*
   2 *  linux/arch/m32r/kernel/process.c
   3 *
   4 *  Copyright (c) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata,
   5 *                            Hitoshi Yamamoto
   6 *  Taken from sh version.
   7 *    Copyright (C) 1995  Linus Torvalds
   8 *    SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
   9 */
  10
  11#undef DEBUG_PROCESS
  12#ifdef DEBUG_PROCESS
  13#define DPRINTK(fmt, args...)  printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
  14  __func__, ##args)
  15#else
  16#define DPRINTK(fmt, args...)
  17#endif
  18
  19/*
  20 * This file handles the architecture-dependent parts of process handling..
  21 */
  22
  23#include <linux/fs.h>
  24#include <linux/slab.h>
  25#include <linux/module.h>
  26#include <linux/ptrace.h>
  27#include <linux/unistd.h>
  28#include <linux/hardirq.h>
  29#include <linux/rcupdate.h>
  30
  31#include <asm/io.h>
  32#include <asm/uaccess.h>
  33#include <asm/mmu_context.h>
  34#include <asm/elf.h>
  35#include <asm/m32r.h>
  36
  37#include <linux/err.h>
  38
  39/*
  40 * Return saved PC of a blocked thread.
  41 */
  42unsigned long thread_saved_pc(struct task_struct *tsk)
  43{
  44        return tsk->thread.lr;
  45}
  46
  47void (*pm_power_off)(void) = NULL;
  48EXPORT_SYMBOL(pm_power_off);
  49
  50void machine_restart(char *__unused)
  51{
  52#if defined(CONFIG_PLAT_MAPPI3)
  53        outw(1, (unsigned long)PLD_REBOOT);
  54#endif
  55
  56        printk("Please push reset button!\n");
  57        while (1)
  58                cpu_relax();
  59}
  60
  61void machine_halt(void)
  62{
  63        printk("Please push reset button!\n");
  64        while (1)
  65                cpu_relax();
  66}
  67
  68void machine_power_off(void)
  69{
  70        /* M32R_FIXME */
  71}
  72
  73void show_regs(struct pt_regs * regs)
  74{
  75        printk("\n");
  76        show_regs_print_info(KERN_DEFAULT);
  77
  78        printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
  79          regs->bpc, regs->psw, regs->lr, regs->fp);
  80        printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
  81          regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
  82        printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
  83          regs->r0, regs->r1, regs->r2, regs->r3);
  84        printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
  85          regs->r4, regs->r5, regs->r6, regs->r7);
  86        printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
  87          regs->r8, regs->r9, regs->r10, regs->r11);
  88        printk("R12[%08lx]\n", \
  89          regs->r12);
  90
  91#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
  92        printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
  93          regs->acc0h, regs->acc0l);
  94        printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
  95          regs->acc1h, regs->acc1l);
  96#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
  97        printk("ACCH[%08lx]:ACCL[%08lx]\n", \
  98          regs->acc0h, regs->acc0l);
  99#else
 100#error unknown isa configuration
 101#endif
 102}
 103
 104/*
 105 * Free current thread data structures etc..
 106 */
 107void exit_thread(void)
 108{
 109        /* Nothing to do. */
 110        DPRINTK("pid = %d\n", current->pid);
 111}
 112
 113void flush_thread(void)
 114{
 115        DPRINTK("pid = %d\n", current->pid);
 116        memset(&current->thread.debug_trap, 0, sizeof(struct debug_trap));
 117}
 118
 119void release_thread(struct task_struct *dead_task)
 120{
 121        /* do nothing */
 122        DPRINTK("pid = %d\n", dead_task->pid);
 123}
 124
 125/* Fill in the fpu structure for a core dump.. */
 126int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 127{
 128        return 0; /* Task didn't use the fpu at all. */
 129}
 130
 131int copy_thread(unsigned long clone_flags, unsigned long spu,
 132        unsigned long arg, struct task_struct *tsk)
 133{
 134        struct pt_regs *childregs = task_pt_regs(tsk);
 135        extern void ret_from_fork(void);
 136        extern void ret_from_kernel_thread(void);
 137
 138        if (unlikely(tsk->flags & PF_KTHREAD)) {
 139                memset(childregs, 0, sizeof(struct pt_regs));
 140                childregs->psw = M32R_PSW_BIE;
 141                childregs->r1 = spu;    /* fn */
 142                childregs->r0 = arg;
 143                tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
 144        } else {
 145                /* Copy registers */
 146                *childregs = *current_pt_regs();
 147                if (spu)
 148                        childregs->spu = spu;
 149                childregs->r0 = 0;      /* Child gets zero as return value */
 150                tsk->thread.lr = (unsigned long)ret_from_fork;
 151        }
 152        tsk->thread.sp = (unsigned long)childregs;
 153
 154        return 0;
 155}
 156
 157/*
 158 * These bracket the sleeping functions..
 159 */
 160#define first_sched     ((unsigned long) scheduling_functions_start_here)
 161#define last_sched      ((unsigned long) scheduling_functions_end_here)
 162
 163unsigned long get_wchan(struct task_struct *p)
 164{
 165        /* M32R_FIXME */
 166        return (0);
 167}
 168