arch/mips/lib-32/dump_tlb.c

   1 /*
   2  * Dump R4x00 TLB for debugging purposes.
   3  *
   4  * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.
   5  * Copyright (C) 1999 by Silicon Graphics, Inc.
   6  */
   7 #include <linux/config.h>
   8 #include <linux/kernel.h>
   9 #include <linux/mm.h>
  10 #include <linux/sched.h>
  11 #include <linux/string.h>
  12
  13 #include <asm/bootinfo.h>
  14 #include <asm/cachectl.h>
  15 #include <asm/cpu.h>
  16 #include <asm/mipsregs.h>
  17 #include <asm/page.h>
  18 #include <asm/pgtable.h>
  19
  20 static inline const char *msk2str(unsigned int mask)
  21 {
  22         switch (mask) {
  23         case PM_4K:
  24                 return "4kb";
  25         case PM_16K:
  26                 return "16kb";
  27         case PM_64K:
  28                 return "64kb";
  29         case PM_256K:
  30                 return "256kb";
  31 #ifndef CONFIG_CPU_VR41XX
  32         case PM_1M:
  33                 return "1Mb";
  34         case PM_4M:
  35                 return "4Mb";
  36         case PM_16M:
  37                 return "16Mb";
  38         case PM_64M:
  39                 return "64Mb";
  40         case PM_256M:
  41                 return "256Mb";
  42 #endif
  43         }
  44
  45         return "unknown";
  46 }
  47
  48 #define BARRIER()                                       \
  49         __asm__ __volatile__(                           \
  50                 ".set\tnoreorder\n\t"                   \
  51                 "nop;nop;nop;nop;nop;nop;nop\n\t"       \
  52                 ".set\treorder");
  53
  54 void dump_tlb(int first, int last)
  55 {
  56         unsigned int pagemask, c0, c1, asid;
  57         unsigned long long entrylo0, entrylo1;
  58         unsigned long entryhi;
  59         int i;
  60
  61         asid = read_c0_entryhi() & 0xff;
  62
  63         printk("\n");
  64         for (i = first; i <= last; i++) {
  65                 write_c0_index(i);
  66                 BARRIER();
  67                 tlb_read();
  68                 BARRIER();
  69                 pagemask = read_c0_pagemask();
  70                 entryhi = read_c0_entryhi();
  71                 entrylo0 = read_c0_entrylo0();
  72                 entrylo1 = read_c0_entrylo1();
  73
  74                 /* Unused entries have a virtual address in KSEG0.  */
  75                 if ((entryhi & 0xf0000000) != 0x80000000
  76                     && (entryhi & 0xff) == asid) {
  77                         /*
  78                          * Only print entries in use
  79                          */
  80                         printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
  81
  82                         c0 = (entrylo0 >> 3) & 7;
  83                         c1 = (entrylo1 >> 3) & 7;
  84
  85                         printk("va=%08lx asid=%02lx\n",
  86                                (entryhi & 0xffffe000), (entryhi & 0xff));
  87                         printk("\t\t\t[pa=%08Lx c=%d d=%d v=%d g=%Ld]\n",
  88                                (entrylo0 << 6) & PAGE_MASK, c0,
  89                                (entrylo0 & 4) ? 1 : 0,
  90                                (entrylo0 & 2) ? 1 : 0, (entrylo0 & 1));
  91                         printk("\t\t\t[pa=%08Lx c=%d d=%d v=%d g=%Ld]\n",
  92                                (entrylo1 << 6) & PAGE_MASK, c1,
  93                                (entrylo1 & 4) ? 1 : 0,
  94                                (entrylo1 & 2) ? 1 : 0, (entrylo1 & 1));
  95                         printk("\n");
  96                 }
  97         }
  98
  99         write_c0_entryhi(asid);
 100 }
 101
 102 void dump_tlb_all(void)
 103 {
 104         dump_tlb(0, current_cpu_data.tlbsize - 1);
 105 }
 106
 107 void dump_tlb_wired(void)
 108 {
 109         int wired;
 110
 111         wired = read_c0_wired();
 112         printk("Wired: %d", wired);
 113         dump_tlb(0, read_c0_wired());
 114 }
 115
 116 void dump_tlb_addr(unsigned long addr)
 117 {
 118         unsigned int flags, oldpid;
 119         int index;
 120
 121         local_irq_save(flags);
 122         oldpid = read_c0_entryhi() & 0xff;
 123         BARRIER();
 124         write_c0_entryhi((addr & PAGE_MASK) | oldpid);
 125         BARRIER();
 126         tlb_probe();
 127         BARRIER();
 128         index = read_c0_index();
 129         write_c0_entryhi(oldpid);
 130         local_irq_restore(flags);
 131
 132         if (index < 0) {
 133                 printk("No entry for address 0x%08lx in TLB\n", addr);
 134                 return;
 135         }
 136
 137         printk("Entry %d maps address 0x%08lx\n", index, addr);
 138         dump_tlb(index, index);
 139 }
 140
 141 void dump_tlb_nonwired(void)
 142 {
 143         dump_tlb(read_c0_wired(), current_cpu_data.tlbsize - 1);
 144 }
 145
 146 void dump_list_process(struct task_struct *t, void *address)
 147 {
 148         pgd_t *page_dir, *pgd;
 149         pud_t *pud;
 150         pmd_t *pmd;
 151         pte_t *pte, page;
 152         unsigned long addr, val;
 153
 154         addr = (unsigned long) address;
 155
 156         printk("Addr                 == %08lx\n", addr);
 157         printk("task                 == %8p\n", t);
 158         printk("task->mm             == %8p\n", t->mm);
 159         //printk("tasks->mm.pgd        == %08x\n", (unsigned int) t->mm->pgd);
 160
 161         if (addr > KSEG0)
 162                 page_dir = pgd_offset_k(0);
 163         else if (t->mm) {
 164                 page_dir = pgd_offset(t->mm, 0);
 165                 printk("page_dir == %08x\n", (unsigned int) page_dir);
 166         } else
 167                 printk("Current thread has no mm\n");
 168
 169         if (addr > KSEG0)
 170                 pgd = pgd_offset_k(addr);
 171         else if (t->mm) {
 172                 pgd = pgd_offset(t->mm, addr);
 173                 printk("pgd == %08x, ", (unsigned int) pgd);
 174                 pud = pud_offset(pgd, addr);
 175                 printk("pud == %08x, ", (unsigned int) pud);
 176
 177                 pmd = pmd_offset(pud, addr);
 178                 printk("pmd == %08x, ", (unsigned int) pmd);
 179
 180                 pte = pte_offset(pmd, addr);
 181                 printk("pte == %08x, ", (unsigned int) pte);
 182         } else
 183                 printk("Current thread has no mm\n");
 184
 185         page = *pte;
 186 #ifdef CONFIG_64BIT_PHYS_ADDR
 187         printk("page == %08Lx\n", pte_val(page));
 188 #else
 189         printk("page == %08lx\n", pte_val(page));
 190 #endif
 191
 192         val = pte_val(page);
 193         if (val & _PAGE_PRESENT)
 194                 printk("present ");
 195         if (val & _PAGE_READ)
 196                 printk("read ");
 197         if (val & _PAGE_WRITE)
 198                 printk("write ");
 199         if (val & _PAGE_ACCESSED)
 200                 printk("accessed ");
 201         if (val & _PAGE_MODIFIED)
 202                 printk("modified ");
 203         if (val & _PAGE_R4KBUG)
 204                 printk("r4kbug ");
 205         if (val & _PAGE_GLOBAL)
 206                 printk("global ");
 207         if (val & _PAGE_VALID)
 208                 printk("valid ");
 209         printk("\n");
 210 }
 211
 212 void dump_list_current(void *address)
 213 {
 214         dump_list_process(current, address);
 215 }
 216
 217 unsigned int vtop(void *address)
 218 {
 219         pgd_t *pgd;
 220         pud_t *pud;
 221         pmd_t *pmd;
 222         pte_t *pte;
 223         unsigned int addr, paddr;
 224
 225         addr = (unsigned long) address;
 226         pgd = pgd_offset(current->mm, addr);
 227         pud = pud_offset(pgd, addr);
 228         pmd = pmd_offset(pud, addr);
 229         pte = pte_offset(pmd, addr);
 230         paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
 231         paddr |= (addr & ~PAGE_MASK);
 232
 233         return paddr;
 234 }
 235
 236 void dump16(unsigned long *p)
 237 {
 238         int i;
 239
 240         for (i = 0; i < 8; i++) {
 241                 printk("*%08lx == %08lx, ", (unsigned long) p, *p);
 242                 p++;
 243                 printk("*%08lx == %08lx\n", (unsigned long) p, *p);
 244                 p++;
 245         }
 246 }