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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 schedule_preempt_disabled();
94 }
95}
96
97void machine_restart(char *__unused)
98{
99#if defined(CONFIG_PLAT_MAPPI3)
100 outw(1, (unsigned long)PLD_REBOOT);
101#endif
102
103 printk("Please push reset button!\n");
104 while (1)
105 cpu_relax();
106}
107
108void machine_halt(void)
109{
110 printk("Please push reset button!\n");
111 while (1)
112 cpu_relax();
113}
114
115void machine_power_off(void)
116{
117 /* M32R_FIXME */
118}
119
120static int __init idle_setup (char *str)
121{
122 if (!strncmp(str, "poll", 4)) {
123 printk("using poll in idle threads.\n");
124 pm_idle = poll_idle;
125 } else if (!strncmp(str, "sleep", 4)) {
126 printk("using sleep in idle threads.\n");
127 pm_idle = default_idle;
128 }
129
130 return 1;
131}
132
133__setup("idle=", idle_setup);
134
135void show_regs(struct pt_regs * regs)
136{
137 printk("\n");
138 printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
139 regs->bpc, regs->psw, regs->lr, regs->fp);
140 printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
141 regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
142 printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
143 regs->r0, regs->r1, regs->r2, regs->r3);
144 printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
145 regs->r4, regs->r5, regs->r6, regs->r7);
146 printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
147 regs->r8, regs->r9, regs->r10, regs->r11);
148 printk("R12[%08lx]\n", \
149 regs->r12);
150
151#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
152 printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
153 regs->acc0h, regs->acc0l);
154 printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
155 regs->acc1h, regs->acc1l);
156#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
157 printk("ACCH[%08lx]:ACCL[%08lx]\n", \
158 regs->acc0h, regs->acc0l);
159#else
160#error unknown isa configuration
161#endif
162}
163
164/*
165 * Create a kernel thread
166 */
167
168/*
169 * This is the mechanism for creating a new kernel thread.
170 *
171 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
172 * who haven't done an "execve()") should use this: it will work within
173 * a system call from a "real" process, but the process memory space will
174 * not be free'd until both the parent and the child have exited.
175 */
176static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg)
177{
178 fn(arg);
179 do_exit(-1);
180}
181
182int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
183{
184 struct pt_regs regs;
185
186 memset(®s, 0, sizeof (regs));
187 regs.r1 = (unsigned long)fn;
188 regs.r2 = (unsigned long)arg;
189
190 regs.bpc = (unsigned long)kernel_thread_helper;
191
192 regs.psw = M32R_PSW_BIE;
193
194 /* Ok, create the new process. */
195 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL,
196 NULL);
197}
198
199/*
200 * Free current thread data structures etc..
201 */
202void exit_thread(void)
203{
204 /* Nothing to do. */
205 DPRINTK("pid = %d\n", current->pid);
206}
207
208void flush_thread(void)
209{
210 DPRINTK("pid = %d\n", current->pid);
211 memset(¤t->thread.debug_trap, 0, sizeof(struct debug_trap));
212}
213
214void release_thread(struct task_struct *dead_task)
215{
216 /* do nothing */
217 DPRINTK("pid = %d\n", dead_task->pid);
218}
219
220/* Fill in the fpu structure for a core dump.. */
221int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
222{
223 return 0; /* Task didn't use the fpu at all. */
224}
225
226int copy_thread(unsigned long clone_flags, unsigned long spu,
227 unsigned long unused, struct task_struct *tsk, struct pt_regs *regs)
228{
229 struct pt_regs *childregs = task_pt_regs(tsk);
230 extern void ret_from_fork(void);
231
232 /* Copy registers */
233 *childregs = *regs;
234
235 childregs->spu = spu;
236 childregs->r0 = 0; /* Child gets zero as return value */
237 regs->r0 = tsk->pid;
238 tsk->thread.sp = (unsigned long)childregs;
239 tsk->thread.lr = (unsigned long)ret_from_fork;
240
241 return 0;
242}
243
244asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
245 unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
246 struct pt_regs regs)
247{
248#ifdef CONFIG_MMU
249 return do_fork(SIGCHLD, regs.spu, ®s, 0, NULL, NULL);
250#else
251 return -EINVAL;
252#endif /* CONFIG_MMU */
253}
254
255asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
256 unsigned long parent_tidptr,
257 unsigned long child_tidptr,
258 unsigned long r4, unsigned long r5, unsigned long r6,
259 struct pt_regs regs)
260{
261 if (!newsp)
262 newsp = regs.spu;
263
264 return do_fork(clone_flags, newsp, ®s, 0,
265 (int __user *)parent_tidptr, (int __user *)child_tidptr);
266}
267
268/*
269 * This is trivial, and on the face of it looks like it
270 * could equally well be done in user mode.
271 *
272 * Not so, for quite unobvious reasons - register pressure.
273 * In user mode vfork() cannot have a stack frame, and if
274 * done by calling the "clone()" system call directly, you
275 * do not have enough call-clobbered registers to hold all
276 * the information you need.
277 */
278asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
279 unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
280 struct pt_regs regs)
281{
282 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, ®s, 0,
283 NULL, NULL);
284}
285
286/*
287 * sys_execve() executes a new program.
288 */
289asmlinkage int sys_execve(const char __user *ufilename,
290 const char __user *const __user *uargv,
291 const char __user *const __user *uenvp,
292 unsigned long r3, unsigned long r4, unsigned long r5,
293 unsigned long r6, struct pt_regs regs)
294{
295 int error;
296 char *filename;
297
298 filename = getname(ufilename);
299 error = PTR_ERR(filename);
300 if (IS_ERR(filename))
301 goto out;
302
303 error = do_execve(filename, uargv, uenvp, ®s);
304 putname(filename);
305out:
306 return error;
307}
308
309/*
310 * These bracket the sleeping functions..
311 */
312#define first_sched ((unsigned long) scheduling_functions_start_here)
313#define last_sched ((unsigned long) scheduling_functions_end_here)
314
315unsigned long get_wchan(struct task_struct *p)
316{
317 /* M32R_FIXME */
318 return (0);
319}