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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/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";
#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, pagemask, c0, c1, i;

      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);
}

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

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