2 * linux/arch/m32r/kernel/process.c
4 * Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
6 * Taken from sh version.
7 * Copyright (C) 1995 Linus Torvalds
8 * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
13 #define DPRINTK(fmt, args...) printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
16 #define DPRINTK(fmt, args...)
20 * This file handles the architecture-dependent parts of process handling..
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>
32 #include <asm/uaccess.h>
33 #include <asm/mmu_context.h>
37 #include <linux/err.h>
40 * Return saved PC of a blocked thread.
42 unsigned long thread_saved_pc(struct task_struct *tsk)
44 return tsk->thread.lr;
48 * Powermanagement idle function, if any..
50 static void (*pm_idle)(void) = NULL;
52 void (*pm_power_off)(void) = NULL;
53 EXPORT_SYMBOL(pm_power_off);
56 * We use this is we don't have any better
59 static void default_idle(void)
61 /* M32R_FIXME: Please use "cpu_sleep" mode. */
66 * On SMP it's slightly faster (but much more power-consuming!)
67 * to poll the ->work.need_resched flag instead of waiting for the
68 * cross-CPU IPI to arrive. Use this option with caution.
70 static void poll_idle (void)
77 * The idle thread. There's no useful work to be
78 * done, so just try to conserve power and have a
79 * low exit latency (ie sit in a loop waiting for
80 * somebody to say that they'd like to reschedule)
84 /* endless idle loop with no priority at all */
87 while (!need_resched()) {
88 void (*idle)(void) = pm_idle;
96 schedule_preempt_disabled();
100 void machine_restart(char *__unused)
102 #if defined(CONFIG_PLAT_MAPPI3)
103 outw(1, (unsigned long)PLD_REBOOT);
106 printk("Please push reset button!\n");
111 void machine_halt(void)
113 printk("Please push reset button!\n");
118 void machine_power_off(void)
123 static int __init idle_setup (char *str)
125 if (!strncmp(str, "poll", 4)) {
126 printk("using poll in idle threads.\n");
128 } else if (!strncmp(str, "sleep", 4)) {
129 printk("using sleep in idle threads.\n");
130 pm_idle = default_idle;
136 __setup("idle=", idle_setup);
138 void show_regs(struct pt_regs * regs)
141 printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
142 regs->bpc, regs->psw, regs->lr, regs->fp);
143 printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
144 regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
145 printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
146 regs->r0, regs->r1, regs->r2, regs->r3);
147 printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
148 regs->r4, regs->r5, regs->r6, regs->r7);
149 printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
150 regs->r8, regs->r9, regs->r10, regs->r11);
151 printk("R12[%08lx]\n", \
154 #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
155 printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
156 regs->acc0h, regs->acc0l);
157 printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
158 regs->acc1h, regs->acc1l);
159 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
160 printk("ACCH[%08lx]:ACCL[%08lx]\n", \
161 regs->acc0h, regs->acc0l);
163 #error unknown isa configuration
168 * Free current thread data structures etc..
170 void exit_thread(void)
173 DPRINTK("pid = %d\n", current->pid);
176 void flush_thread(void)
178 DPRINTK("pid = %d\n", current->pid);
179 memset(¤t->thread.debug_trap, 0, sizeof(struct debug_trap));
182 void release_thread(struct task_struct *dead_task)
185 DPRINTK("pid = %d\n", dead_task->pid);
188 /* Fill in the fpu structure for a core dump.. */
189 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
191 return 0; /* Task didn't use the fpu at all. */
194 int copy_thread(unsigned long clone_flags, unsigned long spu,
195 unsigned long arg, struct task_struct *tsk)
197 struct pt_regs *childregs = task_pt_regs(tsk);
198 extern void ret_from_fork(void);
199 extern void ret_from_kernel_thread(void);
201 if (unlikely(tsk->flags & PF_KTHREAD)) {
202 memset(childregs, 0, sizeof(struct pt_regs));
203 childregs->psw = M32R_PSW_BIE;
204 childregs->r1 = spu; /* fn */
206 tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
209 *childregs = *current_pt_regs();
211 childregs->spu = spu;
212 childregs->r0 = 0; /* Child gets zero as return value */
213 tsk->thread.lr = (unsigned long)ret_from_fork;
215 tsk->thread.sp = (unsigned long)childregs;
221 * These bracket the sleeping functions..
223 #define first_sched ((unsigned long) scheduling_functions_start_here)
224 #define last_sched ((unsigned long) scheduling_functions_end_here)
226 unsigned long get_wchan(struct task_struct *p)