dump_tlb.c

linux-2.6.15.6

/*
 * Dump R4x00 TLB for debugging purposes.
 *
 * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.
 * Copyright (C) 1999 by Silicon Graphics, Inc.
 */
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/string.h>

#include <asm/bootinfo.h>
#include <asm/cachectl.h>
#include <asm/cpu.h>
#include <asm/mipsregs.h>
#include <asm/page.h>
#include <asm/pgtable.h>

static inline const char *msk2str(unsigned int mask)
{
	switch (mask) {
	case PM_4K:
		return "4kb";
	case PM_16K:
		return "16kb";
	case PM_64K:
		return "64kb";
	case PM_256K:
		return "256kb";
#ifndef CONFIG_CPU_VR41XX
	case PM_1M:
		return "1Mb";
	case PM_4M:
		return "4Mb";
	case PM_16M:
		return "16Mb";
	case PM_64M:
		return "64Mb";
	case PM_256M:
		return "256Mb";
#endif
	}

	return "unknown";
}

#define BARRIER()					\
	__asm__ __volatile__(				\
		".set\tnoreorder\n\t"			\
		"nop;nop;nop;nop;nop;nop;nop\n\t"	\
		".set\treorder");

void dump_tlb(int first, int last)
{
	unsigned int pagemask, c0, c1, asid;
	unsigned long long entrylo0, entrylo1;
	unsigned long entryhi;
	int i;

	asid = read_c0_entryhi() & 0xff;

	printk("\n");
	for (i = first; i <= last; i++) {
		write_c0_index(i);
		BARRIER();
		tlb_read();
		BARRIER();
		pagemask = read_c0_pagemask();
		entryhi = read_c0_entryhi();
		entrylo0 = read_c0_entrylo0();
		entrylo1 = read_c0_entrylo1();

		/* Unused entries have a virtual address in KSEG0.  */
		if ((entryhi & 0xf0000000) != 0x80000000
		    && (entryhi & 0xff) == asid) {
			/*
			 * Only print entries in use
			 */
			printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));

			c0 = (entrylo0 >> 3) & 7;
			c1 = (entrylo1 >> 3) & 7;

			printk("va=%08lx asid=%02lx\n",
			       (entryhi & 0xffffe000), (entryhi & 0xff));
			printk("\t\t\t[pa=%08Lx c=%d d=%d v=%d g=%Ld]\n",
			       (entrylo0 << 6) & PAGE_MASK, c0,
			       (entrylo0 & 4) ? 1 : 0,
			       (entrylo0 & 2) ? 1 : 0, (entrylo0 & 1));
			printk("\t\t\t[pa=%08Lx c=%d d=%d v=%d g=%Ld]\n",
			       (entrylo1 << 6) & PAGE_MASK, c1,
			       (entrylo1 & 4) ? 1 : 0,
			       (entrylo1 & 2) ? 1 : 0, (entrylo1 & 1));
			printk("\n");
		}
	}

	write_c0_entryhi(asid);
}

void dump_tlb_all(void)
{
	dump_tlb(0, current_cpu_data.tlbsize - 1);
}

void dump_tlb_wired(void)
{
	int wired;

	wired = read_c0_wired();
	printk("Wired: %d", wired);
	dump_tlb(0, read_c0_wired());
}

void dump_tlb_addr(unsigned long addr)
{
	unsigned int flags, oldpid;
	int index;

	local_irq_save(flags);
	oldpid = read_c0_entryhi() & 0xff;
	BARRIER();
	write_c0_entryhi((addr & PAGE_MASK) | oldpid);
	BARRIER();
	tlb_probe();
	BARRIER();
	index = read_c0_index();
	write_c0_entryhi(oldpid);
	local_irq_restore(flags);

	if (index < 0) {
		printk("No entry for address 0x%08lx in TLB\n", addr);
		return;
	}

	printk("Entry %d maps address 0x%08lx\n", index, addr);
	dump_tlb(index, index);
}

void dump_tlb_nonwired(void)
{
	dump_tlb(read_c0_wired(), current_cpu_data.tlbsize - 1);
}

void dump_list_process(struct task_struct *t, void *address)
{
	pgd_t *page_dir, *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte, page;
	unsigned long addr, val;

	addr = (unsigned long) address;

	printk("Addr                 == %08lx\n", addr);
	printk("task                 == %8p\n", t);
	printk("task->mm             == %8p\n", t->mm);
	//printk("tasks->mm.pgd        == %08x\n", (unsigned int) t->mm->pgd);

	if (addr > KSEG0)
		page_dir = pgd_offset_k(0);
	else if (t->mm) {
		page_dir = pgd_offset(t->mm, 0);
		printk("page_dir == %08x\n", (unsigned int) page_dir);
	} else
		printk("Current thread has no mm\n");

	if (addr > KSEG0)
		pgd = pgd_offset_k(addr);
	else if (t->mm) {
		pgd = pgd_offset(t->mm, addr);
		printk("pgd == %08x, ", (unsigned int) pgd);
		pud = pud_offset(pgd, addr);
		printk("pud == %08x, ", (unsigned int) pud);

		pmd = pmd_offset(pud, addr);
		printk("pmd == %08x, ", (unsigned int) pmd);

		pte = pte_offset(pmd, addr);
		printk("pte == %08x, ", (unsigned int) pte);
	} else
		printk("Current thread has no mm\n");

	page = *pte;
#ifdef CONFIG_64BIT_PHYS_ADDR
	printk("page == %08Lx\n", pte_val(page));
#else
	printk("page == %08lx\n", pte_val(page));
#endif

	val = pte_val(page);
	if (val & _PAGE_PRESENT)
		printk("present ");
	if (val & _PAGE_READ)
		printk("read ");
	if (val & _PAGE_WRITE)
		printk("write ");
	if (val & _PAGE_ACCESSED)
		printk("accessed ");
	if (val & _PAGE_MODIFIED)
		printk("modified ");
	if (val & _PAGE_R4KBUG)
		printk("r4kbug ");
	if (val & _PAGE_GLOBAL)
		printk("global ");
	if (val & _PAGE_VALID)
		printk("valid ");
	printk("\n");
}

void dump_list_current(void *address)
{
	dump_list_process(current, address);
}

unsigned int vtop(void *address)
{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;
	unsigned int addr, paddr;

	addr = (unsigned long) address;
	pgd = pgd_offset(current->mm, addr);
	pud = pud_offset(pgd, addr);
	pmd = pmd_offset(pud, addr);
	pte = pte_offset(pmd, addr);
	paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
	paddr |= (addr & ~PAGE_MASK);

	return paddr;
}

void dump16(unsigned long *p)
{
	int i;

	for (i = 0; i < 8; i++) {
		printk("*%08lx == %08lx, ", (unsigned long) p, *p);
		p++;
		printk("*%08lx == %08lx\n", (unsigned long) p, *p);
		p++;
	}
}