1d8225661e
All paths on m32r lead to cpu_relax(). So delete the dead code and simply call cpu_relax() directly. Signed-off-by: Len Brown <len.brown@intel.com> Cc: linux-m32r@ml.linux-m32r.org
183 lines
4.3 KiB
C
183 lines
4.3 KiB
C
/*
|
|
* linux/arch/m32r/kernel/process.c
|
|
*
|
|
* Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
|
|
* Hitoshi Yamamoto
|
|
* Taken from sh version.
|
|
* Copyright (C) 1995 Linus Torvalds
|
|
* SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
|
|
*/
|
|
|
|
#undef DEBUG_PROCESS
|
|
#ifdef DEBUG_PROCESS
|
|
#define DPRINTK(fmt, args...) printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
|
|
__func__, ##args)
|
|
#else
|
|
#define DPRINTK(fmt, args...)
|
|
#endif
|
|
|
|
/*
|
|
* This file handles the architecture-dependent parts of process handling..
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/hardirq.h>
|
|
#include <linux/rcupdate.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/elf.h>
|
|
#include <asm/m32r.h>
|
|
|
|
#include <linux/err.h>
|
|
|
|
/*
|
|
* Return saved PC of a blocked thread.
|
|
*/
|
|
unsigned long thread_saved_pc(struct task_struct *tsk)
|
|
{
|
|
return tsk->thread.lr;
|
|
}
|
|
|
|
void (*pm_power_off)(void) = NULL;
|
|
EXPORT_SYMBOL(pm_power_off);
|
|
|
|
/*
|
|
* The idle thread. There's no useful work to be
|
|
* done, so just try to conserve power and have a
|
|
* low exit latency (ie sit in a loop waiting for
|
|
* somebody to say that they'd like to reschedule)
|
|
*/
|
|
void cpu_idle (void)
|
|
{
|
|
/* endless idle loop with no priority at all */
|
|
while (1) {
|
|
rcu_idle_enter();
|
|
while (!need_resched())
|
|
cpu_relax();
|
|
rcu_idle_exit();
|
|
schedule_preempt_disabled();
|
|
}
|
|
}
|
|
|
|
void machine_restart(char *__unused)
|
|
{
|
|
#if defined(CONFIG_PLAT_MAPPI3)
|
|
outw(1, (unsigned long)PLD_REBOOT);
|
|
#endif
|
|
|
|
printk("Please push reset button!\n");
|
|
while (1)
|
|
cpu_relax();
|
|
}
|
|
|
|
void machine_halt(void)
|
|
{
|
|
printk("Please push reset button!\n");
|
|
while (1)
|
|
cpu_relax();
|
|
}
|
|
|
|
void machine_power_off(void)
|
|
{
|
|
/* M32R_FIXME */
|
|
}
|
|
|
|
void show_regs(struct pt_regs * regs)
|
|
{
|
|
printk("\n");
|
|
printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
|
|
regs->bpc, regs->psw, regs->lr, regs->fp);
|
|
printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
|
|
regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
|
|
printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
|
|
regs->r0, regs->r1, regs->r2, regs->r3);
|
|
printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
|
|
regs->r4, regs->r5, regs->r6, regs->r7);
|
|
printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
|
|
regs->r8, regs->r9, regs->r10, regs->r11);
|
|
printk("R12[%08lx]\n", \
|
|
regs->r12);
|
|
|
|
#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
|
|
printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
|
|
regs->acc0h, regs->acc0l);
|
|
printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
|
|
regs->acc1h, regs->acc1l);
|
|
#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
|
|
printk("ACCH[%08lx]:ACCL[%08lx]\n", \
|
|
regs->acc0h, regs->acc0l);
|
|
#else
|
|
#error unknown isa configuration
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Free current thread data structures etc..
|
|
*/
|
|
void exit_thread(void)
|
|
{
|
|
/* Nothing to do. */
|
|
DPRINTK("pid = %d\n", current->pid);
|
|
}
|
|
|
|
void flush_thread(void)
|
|
{
|
|
DPRINTK("pid = %d\n", current->pid);
|
|
memset(¤t->thread.debug_trap, 0, sizeof(struct debug_trap));
|
|
}
|
|
|
|
void release_thread(struct task_struct *dead_task)
|
|
{
|
|
/* do nothing */
|
|
DPRINTK("pid = %d\n", dead_task->pid);
|
|
}
|
|
|
|
/* Fill in the fpu structure for a core dump.. */
|
|
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
|
|
{
|
|
return 0; /* Task didn't use the fpu at all. */
|
|
}
|
|
|
|
int copy_thread(unsigned long clone_flags, unsigned long spu,
|
|
unsigned long arg, struct task_struct *tsk)
|
|
{
|
|
struct pt_regs *childregs = task_pt_regs(tsk);
|
|
extern void ret_from_fork(void);
|
|
extern void ret_from_kernel_thread(void);
|
|
|
|
if (unlikely(tsk->flags & PF_KTHREAD)) {
|
|
memset(childregs, 0, sizeof(struct pt_regs));
|
|
childregs->psw = M32R_PSW_BIE;
|
|
childregs->r1 = spu; /* fn */
|
|
childregs->r0 = arg;
|
|
tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
|
|
} else {
|
|
/* Copy registers */
|
|
*childregs = *current_pt_regs();
|
|
if (spu)
|
|
childregs->spu = spu;
|
|
childregs->r0 = 0; /* Child gets zero as return value */
|
|
tsk->thread.lr = (unsigned long)ret_from_fork;
|
|
}
|
|
tsk->thread.sp = (unsigned long)childregs;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* These bracket the sleeping functions..
|
|
*/
|
|
#define first_sched ((unsigned long) scheduling_functions_start_here)
|
|
#define last_sched ((unsigned long) scheduling_functions_end_here)
|
|
|
|
unsigned long get_wchan(struct task_struct *p)
|
|
{
|
|
/* M32R_FIXME */
|
|
return (0);
|
|
}
|