arch/mips/lib/dump_tlb.c

/*
 * 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/kernel.h>
#include <linux/mm.h>

#include <asm/hazards.h>
#include <asm/mipsregs.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/tlbdebug.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";
#ifdef CONFIG_CPU_CAVIUM_OCTEON
	case PM_8K:	return "8kb";
	case PM_32K:	return "32kb";
	case PM_128K:	return "128kb";
	case PM_512K:	return "512kb";
	case PM_2M:	return "2Mb";
	case PM_8M:	return "8Mb";
	case PM_32M:	return "32Mb";
#endif
#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";
	case PM_1G:	return "1Gb";
#endif
	}
	return "";
}

static void dump_tlb(int first, int last)
{
	unsigned long s_entryhi, entryhi, asid;
	unsigned long long entrylo0, entrylo1;
	unsigned int s_index, s_pagemask, pagemask, c0, c1, i;
#ifdef CONFIG_32BIT
	int width = 8;
#else
	int width = 11;
#endif

	s_pagemask = read_c0_pagemask();
	s_entryhi = read_c0_entryhi();
	s_index = read_c0_index();
	asid = s_entryhi & 0xff;

	for (i = first; i <= last; i++) {
		write_c0_index(i);
		mtc0_tlbr_hazard();
		tlb_read();
		tlb_read_hazard();
		pagemask = read_c0_pagemask();
		entryhi	 = read_c0_entryhi();
		entrylo0 = read_c0_entrylo0();
		entrylo1 = read_c0_entrylo1();

		/* EHINV bit marks entire entry as invalid */
		if (cpu_has_tlbinv && entryhi & MIPS_ENTRYHI_EHINV)
			continue;
		/*
		 * Prior to tlbinv, unused entries have a virtual address of
		 * CKSEG0.
		 */
		if ((entryhi & ~0x1ffffUL) == CKSEG0)
			continue;
		/*
		 * ASID takes effect in absence of G (global) bit.
		 * We check both G bits, even though architecturally they should
		 * match one another, because some revisions of the SB1 core may
		 * leave only a single G bit set after a machine check exception
		 * due to duplicate TLB entry.
		 */
		if (!((entrylo0 | entrylo1) & MIPS_ENTRYLO_G) &&
		    (entryhi & 0xff) != asid)
			continue;

		/*
		 * Only print entries in use
		 */
		printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));

		c0 = (entrylo0 & MIPS_ENTRYLO_C) >> MIPS_ENTRYLO_C_SHIFT;
		c1 = (entrylo1 & MIPS_ENTRYLO_C) >> MIPS_ENTRYLO_C_SHIFT;

		printk("va=%0*lx asid=%02lx\n",
		       width, (entryhi & ~0x1fffUL),
		       entryhi & 0xff);
		printk("\t[pa=%0*llx c=%d d=%d v=%d g=%d] ",
		       width,
		       (entrylo0 << 6) & PAGE_MASK, c0,
		       (entrylo0 & MIPS_ENTRYLO_D) ? 1 : 0,
		       (entrylo0 & MIPS_ENTRYLO_V) ? 1 : 0,
		       (entrylo0 & MIPS_ENTRYLO_G) ? 1 : 0);
		printk("[pa=%0*llx c=%d d=%d v=%d g=%d]\n",
		       width,
		       (entrylo1 << 6) & PAGE_MASK, c1,
		       (entrylo1 & MIPS_ENTRYLO_D) ? 1 : 0,
		       (entrylo1 & MIPS_ENTRYLO_V) ? 1 : 0,
		       (entrylo1 & MIPS_ENTRYLO_G) ? 1 : 0);
	}
	printk("\n");

	write_c0_entryhi(s_entryhi);
	write_c0_index(s_index);
	write_c0_pagemask(s_pagemask);
}

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