path: root/arch/sh64/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.
 *
 * arch/sh64/kernel/process.c
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 * Copyright (C) 2003  Paul Mundt
 * Copyright (C) 2003, 2004 Richard Curnow
 *
 * Started from SH3/4 version:
 *   Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
 *
 *   In turn started from i386 version:
 *     Copyright (C) 1995  Linus Torvalds
 *
 */

/*
 * This file handles the architecture-dependent parts of process handling..
 */

/* Temporary flags/tests. All to be removed/undefined. BEGIN */
#define IDLE_TRACE
#define VM_SHOW_TABLES
#define VM_TEST_FAULT
#define VM_TEST_RTLBMISS
#define VM_TEST_WTLBMISS

#undef VM_SHOW_TABLES
#undef IDLE_TRACE
/* Temporary flags/tests. All to be removed/undefined. END */

#define __KERNEL_SYSCALLS__
#include <stdarg.h>

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/rwsem.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/interrupt.h>
#include <linux/unistd.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/init.h>

#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/processor.h>		/* includes also <asm/registers.h> */
#include <asm/mmu_context.h>
#include <asm/elf.h>
#include <asm/page.h>

#include <linux/irq.h>

struct task_struct *last_task_used_math = NULL;

#ifdef IDLE_TRACE
#ifdef VM_SHOW_TABLES
/* For testing */
static void print_PTE(long base)
{
	int i, skip=0;
	long long x, y, *p = (long long *) base;

	for (i=0; i< 512; i++, p++){
		if (*p == 0) {
			if (!skip) {
				skip++;
				printk("(0s) ");
			}
		} else {
			skip=0;
			x = (*p) >> 32;
			y = (*p) & 0xffffffff;
			printk("%08Lx%08Lx ", x, y);
			if (!((i+1)&0x3)) printk("\n");
		}
	}
}

/* For testing */
static void print_DIR(long base)
{
	int i, skip=0;
	long *p = (long *) base;

	for (i=0; i< 512; i++, p++){
		if (*p == 0) {
			if (!skip) {
				skip++;
				printk("(0s) ");
			}
		} else {
			skip=0;
			printk("%08lx ", *p);
			if (!((i+1)&0x7)) printk("\n");
		}
	}
}

/* For testing */
static void print_vmalloc_first_tables(void)
{

#define PRESENT	0x800	/* Bit 11 */

	/*
	 * Do it really dirty by looking at raw addresses,
         * raw offsets, no types. If we used pgtable/pgalloc
	 * macros/definitions we could hide potential bugs.
	 *
	 * Note that pointers are 32-bit for CDC.
	 */
	long pgdt, pmdt, ptet;

	pgdt = (long) &swapper_pg_dir;
	printk("-->PGD (0x%08lx):\n", pgdt);
	print_DIR(pgdt);
	printk("\n");

	/* VMALLOC pool is mapped at 0xc0000000, second (pointer) entry in PGD */
	pgdt += 4;
	pmdt = (long) (* (long *) pgdt);
	if (!(pmdt & PRESENT)) {
		printk("No PMD\n");
		return;
	} else pmdt &= 0xfffff000;

	printk("-->PMD (0x%08lx):\n", pmdt);
	print_DIR(pmdt);
	printk("\n");

	/* Get the pmdt displacement for 0xc0000000 */
	pmdt += 2048;

	/* just look at first two address ranges ... */
        /* ... 0xc0000000 ... */
	ptet = (long) (* (long *) pmdt);
	if (!(ptet & PRESENT)) {
		printk("No PTE0\n");
		return;
	} else ptet &= 0xfffff000;

	printk("-->PTE0 (0x%08lx):\n", ptet);
	print_PTE(ptet);
	printk("\n");

        /* ... 0xc0001000 ... */
	ptet += 4;
	if (!(ptet & PRESENT)) {
		printk("No PTE1\n");
		return;
	} else ptet &= 0xfffff000;
	printk("-->PTE1 (0x%08lx):\n", ptet);
	print_PTE(ptet);
	printk("\n");
}
#else
#define print_vmalloc_first_tables()
#endif	/* VM_SHOW_TABLES */

static void test_VM(void)
{
	void *a, *b, *c;

#ifdef VM_SHOW_TABLES
	printk("Initial PGD/PMD/PTE\n");
#endif
        print_vmalloc_first_tables();

	printk("Allocating 2 bytes\n");
	a = vmalloc(2);
        print_vmalloc_first_tables();

	printk("Allocating 4100 bytes\n");
	b = vmalloc(4100);
        print_vmalloc_first_tables();

	printk("Allocating 20234 bytes\n");
	c = vmalloc(20234);
        print_vmalloc_first_tables();

#ifdef VM_TEST_FAULT
	/* Here you may want to fault ! */

#ifdef VM_TEST_RTLBMISS
	printk