2 * linux/arch/m32r/kernel/process.c
4 * Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
6 * Taken from sh version.
7 * Copyright (C) 1995 Linus Torvalds
8 * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
13 #define DPRINTK(fmt, args...) printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
16 #define DPRINTK(fmt, args...)
20 * This file handles the architecture-dependent parts of process handling..
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>
32 #include <asm/uaccess.h>
33 #include <asm/mmu_context.h>
37 #include <linux/err.h>
40 * Return saved PC of a blocked thread.
42 unsigned long thread_saved_pc(struct task_struct *tsk)
44 return tsk->thread.lr;
48 * Powermanagement idle function, if any..
50 static void (*pm_idle)(void) = NULL;
52 void (*pm_power_off)(void) = NULL;
53 EXPORT_SYMBOL(pm_power_off);
56 * We use this is we don't have any better
59 static void default_idle(void)
61 /* M32R_FIXME: Please use "cpu_sleep" mode. */
66 * On SMP it's slightly faster (but much more power-consuming!)
67 * to poll the ->work.need_resched flag instead of waiting for the
68 * cross-CPU IPI to arrive. Use this option with caution.
70 static void poll_idle (void)
77 * The idle thread. There's no useful work to be
78 * done, so just try to conserve power and have a
79 * low exit latency (ie sit in a loop waiting for
80 * somebody to say that they'd like to reschedule)
84 /* endless idle loop with no priority at all */
87 while (!need_resched()) {
88 void (*idle)(void) = pm_idle;
96 schedule_preempt_disabled();
100 void machine_restart(char *__unused)
102 #if defined(CONFIG_PLAT_MAPPI3)
103 outw(1, (unsigned long)PLD_REBOOT);
106 printk("Please push reset button!\n");
111 void machine_halt(void)
113 printk("Please push reset button!\n");
118 void machine_power_off(void)
123 static int __init idle_setup (char *str)
125 if (!strncmp(str, "poll", 4)) {
126 printk("using poll in idle threads.\n");
128 } else if (!strncmp(str, "sleep", 4)) {
129 printk("using sleep in idle threads.\n");
130 pm_idle = default_idle;
136 __setup("idle=", idle_setup);
138 void show_regs(struct pt_regs * regs)
141 printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
142 regs->bpc, regs->psw, regs->lr, regs->fp);
143 printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
144 regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
145 printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
146 regs->r0, regs->r1, regs->r2, regs->r3);
147 printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
148 regs->r4, regs->r5, regs->r6, regs->r7);
149 printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
150 regs->r8, regs->r9, regs->r10, regs->r11);
151 printk("R12[%08lx]\n", \
154 #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
155 printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
156 regs->acc0h, regs->acc0l);
157 printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
158 regs->acc1h, regs->acc1l);
159 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
160 printk("ACCH[%08lx]:ACCL[%08lx]\n", \
161 regs->acc0h, regs->acc0l);
163 #error unknown isa configuration
168 * Create a kernel thread
172 * This is the mechanism for creating a new kernel thread.
174 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
175 * who haven't done an "execve()") should use this: it will work within
176 * a system call from a "real" process, but the process memory space will
177 * not be free'd until both the parent and the child have exited.
179 static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg)
185 int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
189 memset(®s, 0, sizeof (regs));
190 regs.r1 = (unsigned long)fn;
191 regs.r2 = (unsigned long)arg;
193 regs.bpc = (unsigned long)kernel_thread_helper;
195 regs.psw = M32R_PSW_BIE;
197 /* Ok, create the new process. */
198 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL,
203 * Free current thread data structures etc..
205 void exit_thread(void)
208 DPRINTK("pid = %d\n", current->pid);
211 void flush_thread(void)
213 DPRINTK("pid = %d\n", current->pid);
214 memset(¤t->thread.debug_trap, 0, sizeof(struct debug_trap));
217 void release_thread(struct task_struct *dead_task)
220 DPRINTK("pid = %d\n", dead_task->pid);
223 /* Fill in the fpu structure for a core dump.. */
224 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
226 return 0; /* Task didn't use the fpu at all. */
229 int copy_thread(unsigned long clone_flags, unsigned long spu,
230 unsigned long unused, struct task_struct *tsk, struct pt_regs *regs)
232 struct pt_regs *childregs = task_pt_regs(tsk);
233 extern void ret_from_fork(void);
238 childregs->spu = spu;
239 childregs->r0 = 0; /* Child gets zero as return value */
241 tsk->thread.sp = (unsigned long)childregs;
242 tsk->thread.lr = (unsigned long)ret_from_fork;
247 asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
248 unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
252 return do_fork(SIGCHLD, regs.spu, ®s, 0, NULL, NULL);
255 #endif /* CONFIG_MMU */
258 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
259 unsigned long parent_tidptr,
260 unsigned long child_tidptr,
261 unsigned long r4, unsigned long r5, unsigned long r6,
267 return do_fork(clone_flags, newsp, ®s, 0,
268 (int __user *)parent_tidptr, (int __user *)child_tidptr);
272 * This is trivial, and on the face of it looks like it
273 * could equally well be done in user mode.
275 * Not so, for quite unobvious reasons - register pressure.
276 * In user mode vfork() cannot have a stack frame, and if
277 * done by calling the "clone()" system call directly, you
278 * do not have enough call-clobbered registers to hold all
279 * the information you need.
281 asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
282 unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
285 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, ®s, 0,
290 * sys_execve() executes a new program.
292 asmlinkage int sys_execve(const char __user *ufilename,
293 const char __user *const __user *uargv,
294 const char __user *const __user *uenvp,
295 unsigned long r3, unsigned long r4, unsigned long r5,
296 unsigned long r6, struct pt_regs regs)
301 filename = getname(ufilename);
302 error = PTR_ERR(filename);
303 if (IS_ERR(filename))
306 error = do_execve(filename, uargv, uenvp, ®s);
313 * These bracket the sleeping functions..
315 #define first_sched ((unsigned long) scheduling_functions_start_here)
316 #define last_sched ((unsigned long) scheduling_functions_end_here)
318 unsigned long get_wchan(struct task_struct *p)