dump_tlb.c

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/*
 * 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/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 "";
}

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

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;

    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);
        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 of CKSEG0.  */
        if ((entryhi & ~0x1ffffUL) != CKSEG0
            && (entryhi & 0xff) == asid) {
#ifdef CONFIG_32BIT
            int width = 8;
#else
            int width = 11;
#endif
            /*
             * Only print entries in use
             */
            printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));

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

            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 & 4) ? 1 : 0,
                   (entrylo0 & 2) ? 1 : 0,
                   (entrylo0 & 1) ? 1 : 0);
            printk("[pa=%0*llx c=%d d=%d v=%d g=%d]\n",
                   width,
                   (entrylo1 << 6) & PAGE_MASK, c1,
                   (entrylo1 & 4) ? 1 : 0,
                   (entrylo1 & 2) ? 1 : 0,
                   (entrylo1 & 1) ? 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);
}