[PATCH 23/56] microblaze_v2: process and init task function

monstr
2008-05-04T15:37:29Z

From: Michal Simek <monstr@monstr.eu>

Signed-off-by: Michal Simek <monstr@monstr.eu>
---
arch/microblaze/kernel/init_task.c | 31 +++++++++
arch/microblaze/kernel/process.c | 129 ++++++++++++++++++++++++++++++++++++
2 files changed, 160 insertions(+), 0 deletions(-)
create mode 100644 arch/microblaze/kernel/init_task.c
create mode 100644 arch/microblaze/kernel/process.c

diff --git a/arch/microblaze/kernel/init_task.c b/arch/microblaze/kernel/init_task.c
new file mode 100644
index 0000000..7c6bce3
--- /dev/null
+++ b/arch/microblaze/kernel/init_task.c
@@ -0,0 +1,31 @@
+/*
+ * arch/microblaze/kernel/init_task.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init_task.h>
+#include <linux/fs.h>
+#include <linux/mqueue.h>
+
+#include <asm/pgtable.h>
+
+static struct fs_struct init_fs = INIT_FS;
+static struct files_struct init_files = INIT_FILES;
+static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
+static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
+struct mm_struct init_mm = INIT_MM(init_mm);
+EXPORT_SYMBOL(init_mm);
+
+union thread_union init_thread_union
+ __attribute__((__section__(".data.init_task"))) =
+{ INIT_THREAD_INFO(init_task) };
+
+struct task_struct init_task = INIT_TASK(init_task);
+EXPORT_SYMBOL(init_task);
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
new file mode 100644
index 0000000..679fe19
--- /dev/null
+++ b/arch/microblaze/kernel/process.c
@@ -0,0 +1,129 @@
+/*
+ * arch/microblaze/kernel/process.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/pm.h>
+
+#include <asm/system.h>
+
+/* FIXME */
+void show_regs(struct pt_regs *regs)
+{
+ unsigned long *p;
+ int i;
+ printk(KERN_INFO "pc:\t0x%08lx\tsp:\t0x%08lx\n", regs->pc, regs->r1);
+ printk(KERN_INFO
+ "flags:\t0x%08lx\tear:\t0x%08lx\tesr:\t"
+ "0x%08lx\tfsr:\t0x%08lx\n",
+ regs->msr, regs->ear, regs->esr, regs->fsr);
+ printk(KERN_INFO
+ "r0:\t0x%08lx\tr1:\t0x%08lx\tr2:\t0x%08lx\tr3\t0x%08lx\n",
+ 0L, regs->r1, regs->r2, regs->r3);
+ for (i = 4, p = &(regs->r4); i < 32; i += 4, p += 4) {
+ printk(KERN_INFO "r%i:\t0x%08lx\tr%i:\t0x%08lx\tr%i:\t"
+ "0x%08lx\tr%i:\t0x%08lx\n",
+ i, *p, i+1, *(p+1), i+2, *(p+2), i+3, *(p+3));
+ }
+ printk(KERN_INFO "\n");
+}
+
+void (*pm_power_off)(void) = NULL;
+EXPORT_SYMBOL(pm_power_off);
+
+void cpu_idle(void)
+{
+ set_thread_flag(TIF_POLLING_NRFLAG);
+
+ while (1) {
+ while (!need_resched())
+ cpu_relax();
+
+ preempt_enable_no_resched();
+ schedule();
+ preempt_disable();
+ }
+}
+
+void flush_thread(void)
+{
+}
+
+int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
+ unsigned long unused,
+ struct task_struct *p, struct pt_regs *regs)
+{
+ struct pt_regs *childregs = task_pt_regs(p);
+ struct thread_info *ti = task_thread_info(p);
+
+ *childregs = *regs;
+
+ if (user_mode(regs))
+ childregs->r1 = usp;
+ else
+ childregs->r1 = ((unsigned long) ti) + THREAD_SIZE;
+
+ memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
+ ti->cpu_context.sp = (unsigned long)childregs;
+ ti->cpu_context.msr = (unsigned long)childregs->msr;
+ ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;
+
+ if (clone_flags & CLONE_SETTLS)
+ ;/* FIXME: not sure what to do */
+
+ return 0;
+}
+
+/*
+ * Return saved PC of a blocked thread.
+ * FIXME this needs to be checked
+ */
+unsigned long thread_saved_pc(struct task_struct *tsk)
+{
+ struct cpu_context *ctx =
+ &(((struct thread_info *)(tsk->stack))->cpu_context);
+
+ /* Check whether the thread is blocked in resume() */
+ if (in_sched_functions(ctx->r15))
+ return ((unsigned long)ctx->r15);
+ else
+ return ctx->r14;
+}
+
+static void kernel_thread_helper(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;
+ int ret;
+
+ memset(&regs, 0, sizeof(regs));
+ /* store them in non-volatile registers */
+ regs.r5 = (unsigned long)fn;
+ regs.r6 = (unsigned long)arg;
+ local_save_flags(regs.msr);
+ regs.pc = (unsigned long)kernel_thread_helper;
+ regs.kernel_mode = 1;
+
+ ret = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
+ &regs, 0, NULL, NULL);
+
+ return ret;
+}
+
+unsigned long get_wchan(struct task_struct *p)
+{
+/* TBD (used by procfs) */
+ return 0;
+}
--
1.5.4.GIT