patch-2.4.0-test12 linux/arch/parisc/kernel/process.c

• Lines: 251
• Date: Wed Dec 6 11:46:39 2000
• Orig file: v2.4.0-test11/linux/arch/parisc/kernel/process.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test11/linux/arch/parisc/kernel/process.c linux/arch/parisc/kernel/process.c
@@ -0,0 +1,250 @@
+/*
+ *  linux/arch/parisc/kernel/process.c
+ *	based on the work for i386
+ */
+
+/*
+ * This file handles the architecture-dependent parts of process handling..
+ */
+
+#define __KERNEL_SYSCALLS__
+#include <stdarg.h>
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/malloc.h>
+#include <linux/vmalloc.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/version.h>
+#include <linux/elf.h>
+
+#include <asm/machdep.h>
+#include <asm/offset.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/gsc.h>
+#include <asm/processor.h>
+
+spinlock_t semaphore_wake_lock = SPIN_LOCK_UNLOCKED;
+
+#ifdef __LP64__
+/* The 64-bit code should work equally well in 32-bit land but I didn't
+ * want to take the time to confirm that.  -PB
+ */
+extern unsigned int ret_from_kernel_thread;
+#else
+asmlinkage void ret_from_kernel_thread(void) __asm__("ret_from_kernel_thread");
+#endif
+
+
+int hlt_counter=0;
+
+void disable_hlt(void)
+{
+	hlt_counter++;
+}
+
+void enable_hlt(void)
+{
+	hlt_counter--;
+}
+
+/*
+ * 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 */
+	init_idle();
+	current->nice = 20;
+	current->counter = -100;
+
+	while (1) {
+		while (!current->need_resched) {
+		}
+		schedule();
+		check_pgt_cache();
+	}
+}
+
+void __init reboot_setup(char *str, int *ints)
+{
+}
+
+struct notifier_block *mach_notifier;
+
+void machine_restart(char *ptr)
+{
+	notifier_call_chain(&mach_notifier, MACH_RESTART, ptr);
+}
+
+void machine_halt(void)
+{
+	notifier_call_chain(&mach_notifier, MACH_HALT, NULL);
+}
+
+void machine_power_on(void)
+{
+	notifier_call_chain(&mach_notifier, MACH_POWER_ON, NULL);
+}
+
+void machine_power_off(void)
+{
+	notifier_call_chain(&mach_notifier, MACH_POWER_OFF, NULL);
+}
+
+
+void machine_heartbeat(void)
+{
+}
+
+
+/*
+ * Create a kernel thread
+ */
+
+extern pid_t __kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
+pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
+{
+
+	/*
+	 * FIXME: Once we are sure we don't need any debug here,
+	 *	  kernel_thread can become a #define.
+	 */
+
+	return __kernel_thread(fn, arg, flags);
+}
+
+/*
+ * Free current thread data structures etc..
+ */
+void exit_thread(void)
+{
+}
+
+void flush_thread(void)
+{
+	set_fs(USER_DS);
+}
+
+void release_thread(struct task_struct *dead_task)
+{
+}
+
+/*
+ * Fill in the FPU structure for a core dump.
+ */
+int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r)
+{
+	memcpy(r, regs->fr, sizeof *r);
+	return 1;
+}
+
+/* Note that "fork()" is implemented in terms of clone, with
+   parameters (SIGCHLD, regs->gr[30], regs). */
+int
+sys_clone(unsigned long clone_flags, unsigned long usp,
+	  struct pt_regs *regs)
+{
+	return do_fork(clone_flags, usp, regs, 0);
+}
+
+int
+sys_vfork(struct pt_regs *regs)
+{
+	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
+		       regs->gr[30], regs, 0);
+}
+
+int
+copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
+	    unsigned long unused,	/* in ia64 this is "user_stack_size" */
+	    struct task_struct * p, struct pt_regs * pregs)
+{
+	struct pt_regs * cregs = &(p->thread.regs);
+	long ksp;
+
+	*cregs = *pregs;
+
+	/* Set the return value for the child.  Note that this is not
+           actually restored by the syscall exit path, but we put it
+           here for consistency in case of signals. */
+	cregs->gr[28] = 0; /* child */
+
+	/*
+	 * We need to differentiate between a user fork and a
+	 * kernel fork. We can't use user_mode, because the
+	 * the syscall path doesn't save iaoq. Right now
+	 * We rely on the fact that kernel_thread passes
+	 * in zero for usp.
+	 */
+	if (usp == 0) {
+		/* Kernel Thread */
+		ksp = (((unsigned long)(p)) + TASK_SZ_ALGN);
+		cregs->ksp = ksp;	    /* always return to kernel */
+#ifdef __LP64__
+		cregs->kpc = (unsigned long) &ret_from_kernel_thread;
+#else
+		cregs->kpc = (unsigned long) ret_from_kernel_thread;
+#endif
+
+		/*
+		 * Copy function and argument to be called from
+		 * ret_from_kernel_thread.
+		 */
+		cregs->gr[26] = pregs->gr[26];
+		cregs->gr[25] = pregs->gr[25];
+
+	} else {
+		/* User Thread:
+		 *
+		 * Use same stack depth as parent when in wrapper
+		 *
+		 * Note that the fork wrappers are responsible
+		 * for setting gr[20] and gr[21].
+		 */
+
+		cregs->ksp = ((unsigned long)(p))
+			+ (pregs->gr[20] & (INIT_TASK_SIZE - 1));
+		cregs->kpc = pregs->gr[21];
+	}
+
+	return 0;
+}
+
+/*
+ * sys_execve() executes a new program.
+ */
+
+asmlinkage int sys_execve(struct pt_regs *regs)
+{
+	int error;
+	char *filename;
+
+	filename = getname((char *) regs->gr[26]);
+	error = PTR_ERR(filename);
+	if (IS_ERR(filename))
+		goto out;
+	error = do_execve(filename, (char **) regs->gr[25],
+		(char **) regs->gr[24], regs);
+	if (error == 0)
+		current->ptrace &= ~PT_DTRACE;
+	putname(filename);
+out:
+
+	return error;
+}