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