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/module.h>
25 #include <linux/ptrace.h>
26 #include <linux/unistd.h>
27 #include <linux/slab.h>
28 #include <linux/hardirq.h>
31 #include <asm/uaccess.h>
32 #include <asm/mmu_context.h>
36 #include <linux/err.h>
39 * Return saved PC of a blocked thread.
41 unsigned long thread_saved_pc(struct task_struct *tsk)
43 return tsk->thread.lr;
47 * Powermanagement idle function, if any..
49 static void (*pm_idle)(void) = NULL;
51 void (*pm_power_off)(void) = NULL;
52 EXPORT_SYMBOL(pm_power_off);
55 * We use this is we don't have any better
58 static void default_idle(void)
60 /* M32R_FIXME: Please use "cpu_sleep" mode. */
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.
69 static void poll_idle (void)
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)
83 /* endless idle loop with no priority at all */
85 while (!need_resched()) {
86 void (*idle)(void) = pm_idle;
93 preempt_enable_no_resched();
99 void machine_restart(char *__unused)
101 #if defined(CONFIG_PLAT_MAPPI3)
102 outw(1, (unsigned long)PLD_REBOOT);
105 printk("Please push reset button!\n");
110 void machine_halt(void)
112 printk("Please push reset button!\n");
117 void machine_power_off(void)
122 static int __init idle_setup (char *str)
124 if (!strncmp(str, "poll", 4)) {
125 printk("using poll in idle threads.\n");
127 } else if (!strncmp(str, "sleep", 4)) {
128 printk("using sleep in idle threads.\n");
129 pm_idle = default_idle;
135 __setup("idle=", idle_setup);
137 void show_regs(struct pt_regs * regs)
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", \
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);
162 #error unknown isa configuration
167 * Create a kernel thread
171 * This is the mechanism for creating a new kernel thread.
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.
178 static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg)
184 int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
188 memset(®s, 0, sizeof (regs));
189 regs.r1 = (unsigned long)fn;
190 regs.r2 = (unsigned long)arg;
192 regs.bpc = (unsigned long)kernel_thread_helper;
194 regs.psw = M32R_PSW_BIE;
196 /* Ok, create the new process. */
197 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL,
202 * Free current thread data structures etc..
204 void exit_thread(void)
207 DPRINTK("pid = %d\n", current->pid);
210 void flush_thread(void)
212 DPRINTK("pid = %d\n", current->pid);
213 memset(¤t->thread.debug_trap, 0, sizeof(struct debug_trap));
216 void release_thread(struct task_struct *dead_task)
219 DPRINTK("pid = %d\n", dead_task->pid);
222 /* Fill in the fpu structure for a core dump.. */
223 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
225 return 0; /* Task didn't use the fpu at all. */
228 int copy_thread(int nr, unsigned long clone_flags, unsigned long spu,
229 unsigned long unused, struct task_struct *tsk, struct pt_regs *regs)
231 struct pt_regs *childregs = task_pt_regs(tsk);
232 extern void ret_from_fork(void);
237 childregs->spu = spu;
238 childregs->r0 = 0; /* Child gets zero as return value */
240 tsk->thread.sp = (unsigned long)childregs;
241 tsk->thread.lr = (unsigned long)ret_from_fork;
246 asmlinkage 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,
251 return do_fork(SIGCHLD, regs.spu, ®s, 0, NULL, NULL);
254 #endif /* CONFIG_MMU */
257 asmlinkage 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,
266 return do_fork(clone_flags, newsp, ®s, 0,
267 (int __user *)parent_tidptr, (int __user *)child_tidptr);
271 * This is trivial, and on the face of it looks like it
272 * could equally well be done in user mode.
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.
280 asmlinkage 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,
284 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, ®s, 0,
289 * sys_execve() executes a new program.
291 asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv,
292 char __user * __user *uenvp,
293 unsigned long r3, unsigned long r4, unsigned long r5,
294 unsigned long r6, struct pt_regs regs)
299 filename = getname(ufilename);
300 error = PTR_ERR(filename);
301 if (IS_ERR(filename))
304 error = do_execve(filename, uargv, uenvp, ®s);
307 current->ptrace &= ~PT_DTRACE;
308 task_unlock(current);
316 * These bracket the sleeping functions..
318 #define first_sched ((unsigned long) scheduling_functions_start_here)
319 #define last_sched ((unsigned long) scheduling_functions_end_here)
321 unsigned long get_wchan(struct task_struct *p)