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m32r: Use generic idle loop
[~andy/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  */
42 unsigned long thread_saved_pc(struct task_struct *tsk)
43 {
44         return tsk->thread.lr;
45 }
46
47 void (*pm_power_off)(void) = NULL;
48 EXPORT_SYMBOL(pm_power_off);
49
50 void 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
61 void machine_halt(void)
62 {
63         printk("Please push reset button!\n");
64         while (1)
65                 cpu_relax();
66 }
67
68 void machine_power_off(void)
69 {
70         /* M32R_FIXME */
71 }
72
73 void show_regs(struct pt_regs * regs)
74 {
75         printk("\n");
76         printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
77           regs->bpc, regs->psw, regs->lr, regs->fp);
78         printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
79           regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
80         printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
81           regs->r0, regs->r1, regs->r2, regs->r3);
82         printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
83           regs->r4, regs->r5, regs->r6, regs->r7);
84         printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
85           regs->r8, regs->r9, regs->r10, regs->r11);
86         printk("R12[%08lx]\n", \
87           regs->r12);
88
89 #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
90         printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
91           regs->acc0h, regs->acc0l);
92         printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
93           regs->acc1h, regs->acc1l);
94 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
95         printk("ACCH[%08lx]:ACCL[%08lx]\n", \
96           regs->acc0h, regs->acc0l);
97 #else
98 #error unknown isa configuration
99 #endif
100 }
101
102 /*
103  * Free current thread data structures etc..
104  */
105 void exit_thread(void)
106 {
107         /* Nothing to do. */
108         DPRINTK("pid = %d\n", current->pid);
109 }
110
111 void flush_thread(void)
112 {
113         DPRINTK("pid = %d\n", current->pid);
114         memset(&current->thread.debug_trap, 0, sizeof(struct debug_trap));
115 }
116
117 void release_thread(struct task_struct *dead_task)
118 {
119         /* do nothing */
120         DPRINTK("pid = %d\n", dead_task->pid);
121 }
122
123 /* Fill in the fpu structure for a core dump.. */
124 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
125 {
126         return 0; /* Task didn't use the fpu at all. */
127 }
128
129 int copy_thread(unsigned long clone_flags, unsigned long spu,
130         unsigned long arg, struct task_struct *tsk)
131 {
132         struct pt_regs *childregs = task_pt_regs(tsk);
133         extern void ret_from_fork(void);
134         extern void ret_from_kernel_thread(void);
135
136         if (unlikely(tsk->flags & PF_KTHREAD)) {
137                 memset(childregs, 0, sizeof(struct pt_regs));
138                 childregs->psw = M32R_PSW_BIE;
139                 childregs->r1 = spu;    /* fn */
140                 childregs->r0 = arg;
141                 tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
142         } else {
143                 /* Copy registers */
144                 *childregs = *current_pt_regs();
145                 if (spu)
146                         childregs->spu = spu;
147                 childregs->r0 = 0;      /* Child gets zero as return value */
148                 tsk->thread.lr = (unsigned long)ret_from_fork;
149         }
150         tsk->thread.sp = (unsigned long)childregs;
151
152         return 0;
153 }
154
155 /*
156  * These bracket the sleeping functions..
157  */
158 #define first_sched     ((unsigned long) scheduling_functions_start_here)
159 #define last_sched      ((unsigned long) scheduling_functions_end_here)
160
161 unsigned long get_wchan(struct task_struct *p)
162 {
163         /* M32R_FIXME */
164         return (0);
165 }