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Diffstat (limited to 'arch/m32r/kernel/process.c')
| -rw-r--r-- | arch/m32r/kernel/process.c | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/arch/m32r/kernel/process.c b/arch/m32r/kernel/process.c new file mode 100644 index 0000000..b556c3c --- /dev/null +++ b/arch/m32r/kernel/process.c @@ -0,0 +1,359 @@ +/* + * 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__, \ + __FUNCTION__, ##args) +#else +#define DPRINTK(fmt, args...) +#endif + +/* + * This file handles the architecture-dependent parts of process handling.. + */ + +#include <linux/fs.h> +#include <linux/config.h> +#include <linux/module.h> +#include <linux/ptrace.h> +#include <linux/unistd.h> +#include <linux/slab.h> +#include <linux/hardirq.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> + +static int hlt_counter=0; + +/* + * Return saved PC of a blocked thread. + */ +unsigned long thread_saved_pc(struct task_struct *tsk) +{ + return tsk->thread.lr; +} + +/* + * Powermanagement idle function, if any.. + */ +void (*pm_idle)(void) = NULL; + +void disable_hlt(void) +{ + hlt_counter++; +} + +EXPORT_SYMBOL(disable_hlt); + +void enable_hlt(void) +{ + hlt_counter--; +} + +EXPORT_SYMBOL(enable_hlt); + +/* + * We use this is we don't have any better + * idle routine.. + */ +void default_idle(void) +{ + /* M32R_FIXME: Please use "cpu_sleep" mode. */ + cpu_relax(); +} + +/* + * On SMP it's slightly faster (but much more power-consuming!) + * to poll the ->work.need_resched flag instead of waiting for the + * cross-CPU IPI to arrive. Use this option with caution. + */ +static void poll_idle (void) +{ + /* M32R_FIXME */ + cpu_relax(); +} + +/* + * 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) { + while (!need_resched()) { + void (*idle)(void) = pm_idle; + + if (!idle) + idle = default_idle; + + idle(); + } + schedule(); + } +} + +void machine_restart(char *__unused) +{ + printk("Please push reset button!\n"); + while (1) + cpu_relax(); +} + +EXPORT_SYMBOL(machine_restart); + +void machine_halt(void) +{ + printk("Please push reset button!\n"); + while (1) + cpu_relax(); +} + +EXPORT_SYMBOL(machine_halt); + +void machine_power_off(void) +{ + /* M32R_FIXME */ +} + +EXPORT_SYMBOL(machine_power_off); + +static int __init idle_setup (char *str) +{ + if (!strncmp(str, "poll", 4)) { + printk("using poll in idle threads.\n"); + pm_idle = poll_idle; + } else if (!strncmp(str, "sleep", 4)) { + printk("using sleep in idle threads.\n"); + pm_idle = default_idle; + } + + return 1; +} + +__setup("idle=", idle_setup); + +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->acch, regs->accl); +#else +#error unknown isa configuration +#endif +} + +/* + * Create a kernel thread + */ + +/* + * This is the mechanism for creating a new kernel thread. + * + * NOTE! Only a kernel-only process(ie the swapper or direct descendants + * who haven't done an "execve()") should use this: it will work within + * a system call from a "real" process, but the process memory space will + * not be free'd until both the parent and the child have exited. + */ +static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg) +{ + fn(arg); + do_exit(-1); +} + +int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) +{ + struct pt_regs regs; + + memset(®s, 0, sizeof (regs)); + regs.r1 = (unsigned long)fn; + regs.r2 = (unsigned long)arg; + + regs.bpc = (unsigned long)kernel_thread_helper; + + regs.psw = M32R_PSW_BIE; + + /* Ok, create the new process. */ + return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, + NULL); +} + +/* + * 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(¤t->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(int nr, unsigned long clone_flags, unsigned long spu, + unsigned long unused, struct task_struct *tsk, struct pt_regs *regs) +{ + struct pt_regs *childregs; + unsigned long sp = (unsigned long)tsk->thread_info + THREAD_SIZE; + extern void ret_from_fork(void); + + /* Copy registers */ + sp -= sizeof (struct pt_regs); + childregs = (struct pt_regs *)sp; + *childregs = *regs; + + childregs->spu = spu; + childregs->r0 = 0; /* Child gets zero as return value */ + regs->r0 = tsk->pid; + tsk->thread.sp = (unsigned long)childregs; + tsk->thread.lr = (unsigned long)ret_from_fork; + + return 0; +} + +/* + * fill in the user structure for a core dump.. + */ +void dump_thread(struct pt_regs * regs, struct user * dump) +{ + /* M32R_FIXME */ +} + +/* + * Capture the user space registers if the task is not running (in user space) + */ +int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs) +{ + /* M32R_FIXME */ + return 1; +} + +asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2, + unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, + struct pt_regs regs) +{ +#ifdef CONFIG_MMU + return do_fork(SIGCHLD, regs.spu, ®s, 0, NULL, NULL); +#else + return -EINVAL; +#endif /* CONFIG_MMU */ +} + +asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, + unsigned long parent_tidptr, + unsigned long child_tidptr, + unsigned long r4, unsigned long r5, unsigned long r6, + struct pt_regs regs) +{ + if (!newsp) + newsp = regs.spu; + + return do_fork(clone_flags, newsp, ®s, 0, + (int __user *)parent_tidptr, (int __user *)child_tidptr); +} + +/* + * This is trivial, and on the face of it looks like it + * could equally well be done in user mode. + * + * Not so, for quite unobvious reasons - register pressure. + * In user mode vfork() cannot have a stack frame, and if + * done by calling the "clone()" system call directly, you + * do not have enough call-clobbered registers to hold all + * the information you need. + */ +asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2, + unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, + struct pt_regs regs) +{ + return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, ®s, 0, + NULL, NULL); +} + +/* + * sys_execve() executes a new program. + */ +asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv, + char __user * __user *uenvp, + unsigned long r3, unsigned long r4, unsigned long r5, + unsigned long r6, struct pt_regs regs) +{ + int error; + char *filename; + + filename = getname(ufilename); + error = PTR_ERR(filename); + if (IS_ERR(filename)) + goto out; + + error = do_execve(filename, uargv, uenvp, ®s); + if (error == 0) { + task_lock(current); + current->ptrace &= ~PT_DTRACE; + task_unlock(current); + } + putname(filename); +out: + return error; +} + +/* + * 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); +} |