Initial import

1 files changed, 193 insertions, 0 deletions

diff --git a/arch/cris/arch-v10/kernel/process.c b/arch/cris/arch-v10/kernel/process.c
new file mode 100644
index 000000000..02b783457
--- /dev/null
+++ b/arch/cris/arch-v10/kernel/process.c
@@ -0,0 +1,193 @@
+/*
+ *  linux/arch/cris/kernel/process.c
+ *
+ *  Copyright (C) 1995  Linus Torvalds
+ *  Copyright (C) 2000-2002  Axis Communications AB
+ *
+ *  Authors:   Bjorn Wesen (bjornw@axis.com)
+ *             Mikael Starvik (starvik@axis.com)
+ *
+ * This file handles the architecture-dependent parts of process handling..
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <arch/svinto.h>
+#include <linux/init.h>
+#include <arch/system.h>
+#include <linux/ptrace.h>
+
+#ifdef CONFIG_ETRAX_GPIO
+void etrax_gpio_wake_up_check(void); /* drivers/gpio.c */
+#endif
+
+/*
+ * We use this if we don't have any better
+ * idle routine..
+ */
+void default_idle(void)
+{
+#ifdef CONFIG_ETRAX_GPIO
+	etrax_gpio_wake_up_check();
+#endif
+	local_irq_enable();
+}
+
+/*
+ * Free current thread data structures etc..
+ */
+
+void exit_thread(void)
+{
+	/* Nothing needs to be done.  */
+}
+
+/* if the watchdog is enabled, we can simply disable interrupts and go
+ * into an eternal loop, and the watchdog will reset the CPU after 0.1s
+ * if on the other hand the watchdog wasn't enabled, we just enable it and wait
+ */
+
+void hard_reset_now (void)
+{
+	/*
+	 * Don't declare this variable elsewhere.  We don't want any other
+	 * code to know about it than the watchdog handler in entry.S and
+	 * this code, implementing hard reset through the watchdog.
+	 */
+#if defined(CONFIG_ETRAX_WATCHDOG)
+	extern int cause_of_death;
+#endif
+
+	printk("*** HARD RESET ***\n");
+	local_irq_disable();
+
+#if defined(CONFIG_ETRAX_WATCHDOG)
+	cause_of_death = 0xbedead;
+#else
+	/* Since we dont plan to keep on resetting the watchdog,
+	   the key can be arbitrary hence three */
+	*R_WATCHDOG = IO_FIELD(R_WATCHDOG, key, 3) |
+		IO_STATE(R_WATCHDOG, enable, start);
+#endif
+
+	while(1) /* waiting for RETRIBUTION! */ ;
+}
+
+/*
+ * Return saved PC of a blocked thread.
+ */
+unsigned long thread_saved_pc(struct task_struct *t)
+{
+	return task_pt_regs(t)->irp;
+}
+
+/* setup the child's kernel stack with a pt_regs and switch_stack on it.
+ * it will be un-nested during _resume and _ret_from_sys_call when the
+ * new thread is scheduled.
+ *
+ * also setup the thread switching structure which is used to keep
+ * thread-specific data during _resumes.
+ *
+ */
+asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
+
+int copy_thread(unsigned long clone_flags, unsigned long usp,
+		unsigned long arg, struct task_struct *p)
+{
+	struct pt_regs *childregs = task_pt_regs(p);
+	struct switch_stack *swstack = ((struct switch_stack *)childregs) - 1;
+	
+	/* put the pt_regs structure at the end of the new kernel stack page and fix it up
+	 * remember that the task_struct doubles as the kernel stack for the task
+	 */
+
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		memset(swstack, 0,
+			sizeof(struct switch_stack) + sizeof(struct pt_regs));
+		swstack->r1 = usp;
+		swstack->r2 = arg;
+		childregs->dccr = 1 << I_DCCR_BITNR;
+		swstack->return_ip = (unsigned long) ret_from_kernel_thread;
+		p->thread.ksp = (unsigned long) swstack;
+		p->thread.usp = 0;
+		return 0;
+	}
+	*childregs = *current_pt_regs();  /* struct copy of pt_regs */
+
+        childregs->r10 = 0;  /* child returns 0 after a fork/clone */
+
+	/* put the switch stack right below the pt_regs */
+
+	swstack->r9 = 0; /* parameter to ret_from_sys_call, 0 == dont restart the syscall */
+
+	/* we want to return into ret_from_sys_call after the _resume */
+
+	swstack->return_ip = (unsigned long) ret_from_fork; /* Will call ret_from_sys_call */
+	
+	/* fix the user-mode stackpointer */
+
+	p->thread.usp = usp ?: rdusp();
+
+	/* and the kernel-mode one */
+
+	p->thread.ksp = (unsigned long) swstack;
+
+#ifdef DEBUG
+	printk("copy_thread: new regs at 0x%p, as shown below:\n", childregs);
+	show_registers(childregs);
+#endif
+
+	return 0;
+}
+
+unsigned long get_wchan(struct task_struct *p)
+{
+#if 0
+	/* YURGH. TODO. */
+
+        unsigned long ebp, esp, eip;
+        unsigned long stack_page;
+        int count = 0;
+        if (!p || p == current || p->state == TASK_RUNNING)
+                return 0;
+        stack_page = (unsigned long)p;
+        esp = p->thread.esp;
+        if (!stack_page || esp < stack_page || esp > 8188+stack_page)
+                return 0;
+        /* include/asm-i386/system.h:switch_to() pushes ebp last. */
+        ebp = *(unsigned long *) esp;
+        do {
+                if (ebp < stack_page || ebp > 8184+stack_page)
+                        return 0;
+                eip = *(unsigned long *) (ebp+4);
+		if (!in_sched_functions(eip))
+			return eip;
+                ebp = *(unsigned long *) ebp;
+        } while (count++ < 16);
+#endif
+        return 0;
+}
+#undef last_sched
+#undef first_sched
+
+void show_regs(struct pt_regs * regs)
+{
+	unsigned long usp = rdusp();
+
+	show_regs_print_info(KERN_DEFAULT);
+
+	printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n",
+	       regs->irp, regs->srp, regs->dccr, usp, regs->mof );
+	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 r13: %08lx oR10: %08lx\n",
+	       regs->r12, regs->r13, regs->orig_r10);
+}
+