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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
30#include <asm/io.h>
31#include <asm/uaccess.h>
32#include <asm/mmu_context.h>
33#include <asm/elf.h>
34#include <asm/m32r.h>
35
36#include <linux/err.h>
37
38/*
39 * Return saved PC of a blocked thread.
40 */
41unsigned long thread_saved_pc(struct task_struct *tsk)
42{
43 return tsk->thread.lr;
44}
45
46/*
47 * Powermanagement idle function, if any..
48 */
49static void (*pm_idle)(void) = NULL;
50
51void (*pm_power_off)(void) = NULL;
52EXPORT_SYMBOL(pm_power_off);
53
54/*
55 * We use this is we don't have any better
56 * idle routine..
57 */
58static void default_idle(void)
59{
60 /* M32R_FIXME: Please use "cpu_sleep" mode. */
61 cpu_relax();
62}
63
64/*
65 * On SMP it's slightly faster (but much more power-consuming!)
66 * to poll the ->work.need_resched flag instead of waiting for the
67 * cross-CPU IPI to arrive. Use this option with caution.
68 */
69static void poll_idle (void)
70{
71 /* M32R_FIXME */
72 cpu_relax();
73}
74
75/*
76 * The idle thread. There's no useful work to be
77 * done, so just try to conserve power and have a
78 * low exit latency (ie sit in a loop waiting for
79 * somebody to say that they'd like to reschedule)
80 */
81void cpu_idle (void)
82{
83 /* endless idle loop with no priority at all */
84 while (1) {
85 while (!need_resched()) {
86 void (*idle)(void) = pm_idle;
87
88 if (!idle)
89 idle = default_idle;
90
91 idle();
92 }
93 preempt_enable_no_resched();
94 schedule();
95 preempt_disable();
96 }
97}
98
99void machine_restart(char *__unused)
100{
101#if defined(CONFIG_PLAT_MAPPI3)
102 outw(1, (unsigned long)PLD_REBOOT);
103#endif
104
105 printk("Please push reset button!\n");
106 while (1)
107 cpu_relax();
108}
109
110void machine_halt(void)
111{
112 printk("Please push reset button!\n");
113 while (1)
114 cpu_relax();
115}
116
117void machine_power_off(void)
118{
119 /* M32R_FIXME */
120}
121
122static int __init idle_setup (char *str)
123{
124 if (!strncmp(str, "poll", 4)) {
125 printk("using poll in idle threads.\n");
126 pm_idle = poll_idle;
127 } else if (!strncmp(str, "sleep", 4)) {
128 printk("using sleep in idle threads.\n");
129 pm_idle = default_idle;
130 }
131
132 return 1;
133}
134
135__setup("idle=", idle_setup);
136
137void show_regs(struct pt_regs * regs)
138{
139 printk("\n");
140 printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
141 regs->bpc, regs->psw, regs->lr, regs->fp);
142 printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
143 regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
144 printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
145 regs->r0, regs->r1, regs->r2, regs->r3);
146 printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
147 regs->r4, regs->r5, regs->r6, regs->r7);
148 printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
149 regs->r8, regs->r9, regs->r10, regs->r11);
150 printk("R12[%08lx]\n", \
151 regs->r12);
152
153#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
154 printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
155 regs->acc0h, regs->acc0l);
156 printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
157 regs->acc1h, regs->acc1l);
158#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
159 printk("ACCH[%08lx]:ACCL[%08lx]\n", \
160 regs->acc0h, regs->acc0l);
161#else
162#error unknown isa configuration
163#endif
164}
165
166/*
167 * Create a kernel thread
168 */
169
170/*
171 * This is the mechanism for creating a new kernel thread.
172 *
173 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
174 * who haven't done an "execve()") should use this: it will work within
175 * a system call from a "real" process, but the process memory space will
176 * not be free'd until both the parent and the child have exited.
177 */
178static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg)
179{
180 fn(arg);
181 do_exit(-1);
182}
183
184int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
185{
186 struct pt_regs regs;
187
188 memset(®s, 0, sizeof (regs));
189 regs.r1 = (unsigned long)fn;
190 regs.r2 = (unsigned long)arg;
191
192 regs.bpc = (unsigned long)kernel_thread_helper;
193
194 regs.psw = M32R_PSW_BIE;
195
196 /* Ok, create the new process. */
197 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL,
198 NULL);
199}
200
201/*
202 * Free current thread data structures etc..
203 */
204void exit_thread(void)
205{
206 /* Nothing to do. */
207 DPRINTK("pid = %d\n", current->pid);
208}
209
210void flush_thread(void)
211{
212 DPRINTK("pid = %d\n", current->pid);
213 memset(¤t->thread.debug_trap, 0, sizeof(struct debug_trap));
214}
215
216void release_thread(struct task_struct *dead_task)
217{
218 /* do nothing */
219 DPRINTK("pid = %d\n", dead_task->pid);
220}
221
222/* Fill in the fpu structure for a core dump.. */
223int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
224{
225 return 0; /* Task didn't use the fpu at all. */
226}
227
228int copy_thread(unsigned long clone_flags, unsigned long spu,
229 unsigned long unused, struct task_struct *tsk, struct pt_regs *regs)
230{
231 struct pt_regs *childregs = task_pt_regs(tsk);
232 extern void ret_from_fork(void);
233
234 /* Copy registers */
235 *childregs = *regs;
236
237 childregs->spu = spu;
238 childregs->r0 = 0; /* Child gets zero as return value */
239 regs->r0 = tsk->pid;
240 tsk->thread.sp = (unsigned long)childregs;
241 tsk->thread.lr = (unsigned long)ret_from_fork;
242
243 return 0;
244}
245
246asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
247 unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
248 struct pt_regs regs)
249{
250#ifdef CONFIG_MMU
251 return do_fork(SIGCHLD, regs.spu, ®s, 0, NULL, NULL);
252#else
253 return -EINVAL;
254#endif /* CONFIG_MMU */
255}
256
257asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
258 unsigned long parent_tidptr,
259 unsigned long child_tidptr,
260 unsigned long r4, unsigned long r5, unsigned long r6,
261 struct pt_regs regs)
262{
263 if (!newsp)
264 newsp = regs.spu;
265
266 return do_fork(clone_flags, newsp, ®s, 0,
267 (int __user *)parent_tidptr, (int __user *)child_tidptr);
268}
269
270/*
271 * This is trivial, and on the face of it looks like it
272 * could equally well be done in user mode.
273 *
274 * Not so, for quite unobvious reasons - register pressure.
275 * In user mode vfork() cannot have a stack frame, and if
276 * done by calling the "clone()" system call directly, you
277 * do not have enough call-clobbered registers to hold all
278 * the information you need.
279 */
280asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
281 unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
282 struct pt_regs regs)
283{
284 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, ®s, 0,
285 NULL, NULL);
286}
287
288/*
289 * sys_execve() executes a new program.
290 */
291asmlinkage int sys_execve(const char __user *ufilename,
292 const char __user *const __user *uargv,
293 const char __user *const __user *uenvp,
294 unsigned long r3, unsigned long r4, unsigned long r5,
295 unsigned long r6, struct pt_regs regs)
296{
297 int error;
298 char *filename;
299
300 filename = getname(ufilename);
301 error = PTR_ERR(filename);
302 if (IS_ERR(filename))
303 goto out;
304
305 error = do_execve(filename, uargv, uenvp, ®s);
306 putname(filename);
307out:
308 return error;
309}
310
311/*
312 * These bracket the sleeping functions..
313 */
314#define first_sched ((unsigned long) scheduling_functions_start_here)
315#define last_sched ((unsigned long) scheduling_functions_end_here)
316
317unsigned long get_wchan(struct task_struct *p)
318{
319 /* M32R_FIXME */
320 return (0);
321}
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(¤t->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}