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}