imported original firmware WRT54GL_v4.30.11_11_US

1 files changed, 219 insertions, 0 deletions

diff --git a/release/src/linux/linux/arch/mips/kernel/process.c b/release/src/linux/linux/arch/mips/kernel/process.c
new file mode 100644
index 00000000..40a56d14
--- /dev/null
+++ b/release/src/linux/linux/arch/mips/kernel/process.c
@@ -0,0 +1,219 @@
+/*
+ * 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) 1994 - 2000 by Ralf Baechle and others.
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ */
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/personality.h>
+#include <linux/slab.h>
+#include <linux/mman.h>
+#include <linux/sys.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+
+#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+#include <asm/fpu.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/mipsregs.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/elf.h>
+#include <asm/isadep.h>
+
+ATTRIB_NORET void cpu_idle(void)
+{
+	/* endless idle loop with no priority at all */
+	current->nice = 20;
+	current->counter = -100;
+	init_idle();
+
+	while (1) {
+		while (!current->need_resched)
+			if (cpu_wait)
+				(*cpu_wait)();
+		schedule();
+		check_pgt_cache();
+	}
+}
+
+asmlinkage void ret_from_fork(void);
+
+void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
+{
+	regs->cp0_status &= ~(ST0_CU0|ST0_KSU|ST0_CU1);
+       	regs->cp0_status |= KU_USER;
+	current->used_math = 0;
+	loose_fpu();
+	regs->cp0_epc = pc;
+	regs->regs[29] = sp;
+	current->thread.current_ds = USER_DS;
+}
+
+void exit_thread(void)
+{
+}
+
+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;
+	long childksp;
+
+	childksp = (unsigned long)p + KERNEL_STACK_SIZE - 32;
+
+	if (is_fpu_owner()) {
+		save_fp(p);
+	}
+	
+	/* set up new TSS. */
+	childregs = (struct pt_regs *) childksp - 1;
+	*childregs = *regs;
+	childregs->regs[7] = 0;	/* Clear error flag */
+	if(current->personality == PER_LINUX) {
+		childregs->regs[2] = 0;	/* Child gets zero as return value */
+		regs->regs[2] = p->pid;
+	} else {
+		/* Under IRIX things are a little different. */
+		childregs->regs[2] = 0;
+		childregs->regs[3] = 1;
+		regs->regs[2] = p->pid;
+		regs->regs[3] = 0;
+	}
+	if (childregs->cp0_status & ST0_CU0) {
+		childregs->regs[28] = (unsigned long) p;
+		childregs->regs[29] = childksp;
+		p->thread.current_ds = KERNEL_DS;
+	} else {
+		childregs->regs[29] = usp;
+		p->thread.current_ds = USER_DS;
+	}
+	p->thread.reg29 = (unsigned long) childregs;
+	p->thread.reg31 = (unsigned long) ret_from_fork;
+
+	/*
+	 * New tasks loose permission to use the fpu. This accelerates context
+	 * switching for most programs since they don't use the fpu.
+	 */
+	p->thread.cp0_status = read_c0_status() &
+                            ~(ST0_CU2|ST0_CU1|KU_MASK);
+	childregs->cp0_status &= ~(ST0_CU2|ST0_CU1);
+
+	return 0;
+}
+
+/* Fill in the fpu structure for a core dump.. */
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
+{
+	memcpy(r, &current->thread.fpu, sizeof(current->thread.fpu));
+	return 1;
+}
+
+/*
+ * Create a kernel thread
+ */
+int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
+{
+	long retval;
+
+	__asm__ __volatile__(
+		"	.set	noreorder	\n"
+		"	move    $6, $sp		\n"
+		"	move    $4, %5		\n"
+		"	li      $2, %1		\n"
+		"	syscall			\n"
+		"	beq     $6, $sp, 1f	\n"
+		"	 subu    $sp, 32	\n"
+		"	jalr    %4		\n"
+		"	 move    $4, %3		\n"
+		"	move    $4, $2		\n"
+		"	li      $2, %2		\n"
+		"	syscall			\n"
+		"1:	addiu   $sp, 32		\n"
+		"	move    %0, $2		\n"
+		"	.set	reorder"
+		: "=r" (retval)
+		: "i" (__NR_clone), "i" (__NR_exit), "r" (arg), "r" (fn),
+		  "r" (flags | CLONE_VM)
+		 /*
+		  * The called subroutine might have destroyed any of the
+		  * at, result, argument or temporary registers ...
+		  */
+		: "$2", "$3", "$4", "$5", "$6", "$7", "$8",
+		  "$9","$10","$11","$12","$13","$14","$15","$24","$25", "$31");
+
+	return retval;
+}
+
+/*
+ * These bracket the sleeping functions..
+ */
+extern void scheduling_functions_start_here(void);
+extern void scheduling_functions_end_here(void);
+#define first_sched	((unsigned long) scheduling_functions_start_here)
+#define last_sched	((unsigned long) scheduling_functions_end_here)
+
+/* get_wchan - a maintenance nightmare^W^Wpain in the ass ...  */
+unsigned long get_wchan(struct task_struct *p)
+{
+	unsigned long frame, pc;
+
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+
+	pc = thread_saved_pc(&p->thread);
+	if (pc < first_sched || pc >= last_sched) {
+		return pc;
+	}
+
+	if (pc >= (unsigned long) sleep_on_timeout)
+		goto schedule_timeout_caller;
+	if (pc >= (unsigned long) sleep_on)
+		goto schedule_caller;
+	if (pc >= (unsigned long) interruptible_sleep_on_timeout)
+		goto schedule_timeout_caller;
+	if (pc >= (unsigned long)interruptible_sleep_on)
+		goto schedule_caller;
+	/* Fall through */
+
+schedule_caller:
+	pc = ((unsigned long *)p->thread.reg30)[13];
+
+	return pc;
+
+schedule_timeout_caller:
+	/*
+	 * The schedule_timeout frame
+	 */
+	frame = ((unsigned long *)p->thread.reg30)[13];
+
+	/*
+	 * frame now points to sleep_on_timeout's frame
+	 */
+	frame = ((unsigned long *)frame)[9];
+	pc    = ((unsigned long *)frame)[10];
+
+	if (pc >= first_sched && pc < last_sched) {
+		/* schedule_timeout called by interruptible_sleep_on_timeout */
+		frame = ((unsigned long *)frame)[9];
+		pc    = ((unsigned long *)frame)[10];
+	}
+
+	return pc;
+}