summaryrefslogtreecommitdiffstats
path: root/arch/m32r/kernel/process.c
blob: bde899e155d3a682e6a396b74c7f9edf0e6ccd73 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
/*
 *  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(&current->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);
}