Initial import

1 files changed, 192 insertions, 0 deletions

diff --git a/arch/mn10300/kernel/process.c b/arch/mn10300/kernel/process.c
new file mode 100644
index 000000000..3707da583
--- /dev/null
+++ b/arch/mn10300/kernel/process.c
@@ -0,0 +1,192 @@
+/* MN10300  Process handling code
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/percpu.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/rcupdate.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/mmu_context.h>
+#include <asm/fpu.h>
+#include <asm/reset-regs.h>
+#include <asm/gdb-stub.h>
+#include "internal.h"
+
+/*
+ * return saved PC of a blocked thread.
+ */
+unsigned long thread_saved_pc(struct task_struct *tsk)
+{
+	return ((unsigned long *) tsk->thread.sp)[3];
+}
+
+/*
+ * power off function, if any
+ */
+void (*pm_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
+
+/*
+ * 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.
+ *
+ * tglx: No idea why this depends on HOTPLUG_CPU !?!
+ */
+#if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU)
+void arch_cpu_idle(void)
+{
+	safe_halt();
+}
+#endif
+
+void release_segments(struct mm_struct *mm)
+{
+}
+
+void machine_restart(char *cmd)
+{
+#ifdef CONFIG_KERNEL_DEBUGGER
+	gdbstub_exit(0);
+#endif
+
+#ifdef mn10300_unit_hard_reset
+	mn10300_unit_hard_reset();
+#else
+	mn10300_proc_hard_reset();
+#endif
+}
+
+void machine_halt(void)
+{
+#ifdef CONFIG_KERNEL_DEBUGGER
+	gdbstub_exit(0);
+#endif
+}
+
+void machine_power_off(void)
+{
+#ifdef CONFIG_KERNEL_DEBUGGER
+	gdbstub_exit(0);
+#endif
+}
+
+void show_regs(struct pt_regs *regs)
+{
+	show_regs_print_info(KERN_DEFAULT);
+}
+
+/*
+ * free current thread data structures etc..
+ */
+void exit_thread(void)
+{
+	exit_fpu();
+}
+
+void flush_thread(void)
+{
+	flush_fpu();
+}
+
+void release_thread(struct task_struct *dead_task)
+{
+}
+
+/*
+ * we do not have to muck with descriptors here, that is
+ * done in switch_mm() as needed.
+ */
+void copy_segments(struct task_struct *p, struct mm_struct *new_mm)
+{
+}
+
+/*
+ * this gets called so that we can store lazy state into memory and copy the
+ * current task into the new thread.
+ */
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+	unlazy_fpu(src);
+	*dst = *src;
+	return 0;
+}
+
+/*
+ * set up the kernel stack for a new thread and copy arch-specific thread
+ * control information
+ */
+int copy_thread(unsigned long clone_flags,
+		unsigned long c_usp, unsigned long ustk_size,
+		struct task_struct *p)
+{
+	struct thread_info *ti = task_thread_info(p);
+	struct pt_regs *c_regs;
+	unsigned long c_ksp;
+
+	c_ksp = (unsigned long) task_stack_page(p) + THREAD_SIZE;
+
+	/* allocate the userspace exception frame and set it up */
+	c_ksp -= sizeof(struct pt_regs);
+	c_regs = (struct pt_regs *) c_ksp;
+	c_ksp -= 12; /* allocate function call ABI slack */
+
+	/* set up things up so the scheduler can start the new task */
+	p->thread.uregs = c_regs;
+	ti->frame	= c_regs;
+	p->thread.a3	= (unsigned long) c_regs;
+	p->thread.sp	= c_ksp;
+	p->thread.wchan	= p->thread.pc;
+	p->thread.usp	= c_usp;
+
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		memset(c_regs, 0, sizeof(struct pt_regs));
+		c_regs->a0 = c_usp; /* function */
+		c_regs->d0 = ustk_size; /* argument */
+		local_save_flags(c_regs->epsw);
+		c_regs->epsw |= EPSW_IE | EPSW_IM_7;
+		p->thread.pc	= (unsigned long) ret_from_kernel_thread;
+		return 0;
+	}
+	*c_regs = *current_pt_regs();
+	if (c_usp)
+		c_regs->sp = c_usp;
+	c_regs->epsw &= ~EPSW_FE; /* my FPU */
+
+	/* the new TLS pointer is passed in as arg #5 to sys_clone() */
+	if (clone_flags & CLONE_SETTLS)
+		c_regs->e2 = current_frame()->d3;
+
+	p->thread.pc	= (unsigned long) ret_from_fork;
+
+	return 0;
+}
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	return p->thread.wchan;
+}