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 19static inline const char *msk2str(unsigned int mask) 20{ 21 switch (mask) { 22 case PM_4K: return "4kb"; 23 case PM_16K: return "16kb"; 24 case PM_64K: return "64kb"; 25 case PM_256K: return "256kb"; 26#ifndef CONFIG_CPU_VR41XX 27 case PM_1M: return "1Mb"; 28 case PM_4M: return "4Mb"; 29 case PM_16M: return "16Mb"; 30 case PM_64M: return "64Mb"; 31 case PM_256M: return "256Mb"; 32#endif 33 } 34} 35 36#define BARRIER() \ 37 __asm__ __volatile__( \ 38 ".set\tnoreorder\n\t" \ 39 "nop;nop;nop;nop;nop;nop;nop\n\t" \ 40 ".set\treorder"); 41 42void dump_tlb(int first, int last) 43{ 44 unsigned long s_entryhi, entryhi, entrylo0, entrylo1, asid; 45 unsigned int s_index, pagemask, c0, c1, i; 46 47 s_entryhi = read_c0_entryhi(); 48 s_index = read_c0_index(); 49 asid = s_entryhi & 0xff; 50 51 for (i = first; i <= last; i++) { 52 write_c0_index(i); 53 BARRIER(); 54 tlb_read(); 55 BARRIER(); 56 pagemask = read_c0_pagemask(); 57 entryhi = read_c0_entryhi(); 58 entrylo0 = read_c0_entrylo0(); 59 entrylo1 = read_c0_entrylo1(); 60 61 /* Unused entries have a virtual address of CKSEG0. */ 62 if ((entryhi & ~0x1ffffUL) != CKSEG0 63 && (entryhi & 0xff) == asid) { 64 /* 65 * Only print entries in use 66 */ 67 printk("Index: %2d pgmask=%s ", i, msk2str(pagemask)); 68 69 c0 = (entrylo0 >> 3) & 7; 70 c1 = (entrylo1 >> 3) & 7; 71 72 printk("va=%011lx asid=%02lx\n", 73 (entryhi & ~0x1fffUL), 74 entryhi & 0xff); 75 printk("\t[pa=%011lx c=%d d=%d v=%d g=%ld] ", 76 (entrylo0 << 6) & PAGE_MASK, c0, 77 (entrylo0 & 4) ? 1 : 0, 78 (entrylo0 & 2) ? 1 : 0, 79 (entrylo0 & 1)); 80 printk("[pa=%011lx c=%d d=%d v=%d g=%ld]\n", 81 (entrylo1 << 6) & PAGE_MASK, c1, 82 (entrylo1 & 4) ? 1 : 0, 83 (entrylo1 & 2) ? 1 : 0, 84 (entrylo1 & 1)); 85 } 86 } 87 printk("\n"); 88 89 write_c0_entryhi(s_entryhi); 90 write_c0_index(s_index); 91} 92 93void dump_tlb_all(void) 94{ 95 dump_tlb(0, current_cpu_data.tlbsize - 1); 96} 97 98void dump_tlb_wired(void) 99{ 100 int wired; 101 102 wired = read_c0_wired(); 103 printk("Wired: %d", wired); 104 dump_tlb(0, read_c0_wired()); 105} 106 107void dump_tlb_addr(unsigned long addr) 108{ 109 unsigned int flags, oldpid; 110 int index; 111 112 local_irq_save(flags); 113 oldpid = read_c0_entryhi() & 0xff; 114 BARRIER(); 115 write_c0_entryhi((addr & PAGE_MASK) | oldpid); 116 BARRIER(); 117 tlb_probe(); 118 BARRIER(); 119 index = read_c0_index(); 120 write_c0_entryhi(oldpid); 121 local_irq_restore(flags); 122 123 if (index < 0) { 124 printk("No entry for address 0x%08lx in TLB\n", addr); 125 return; 126 } 127 128 printk("Entry %d maps address 0x%08lx\n", index, addr); 129 dump_tlb(index, index); 130} 131 132void dump_tlb_nonwired(void) 133{ 134 dump_tlb(read_c0_wired(), current_cpu_data.tlbsize - 1); 135} 136 137void dump_list_process(struct task_struct *t, void *address) 138{ 139 pgd_t *page_dir, *pgd; 140 pud_t *pud; 141 pmd_t *pmd; 142 pte_t *pte, page; 143 unsigned long addr, val; 144 145 addr = (unsigned long) address; 146 147 printk("Addr == %08lx\n", addr); 148 printk("tasks->mm.pgd == %08lx\n", (unsigned long) t->mm->pgd); 149 150 page_dir = pgd_offset(t->mm, 0UL); 151 printk("page_dir == %016lx\n", (unsigned long) page_dir); 152 153 pgd = pgd_offset(t->mm, addr); 154 printk("pgd == %016lx\n", (unsigned long) pgd); 155 156 pud = pud_offset(pgd, addr); 157 printk("pud == %016lx\n", (unsigned long) pud); 158 159 pmd = pmd_offset(pud, addr); 160 printk("pmd == %016lx\n", (unsigned long) pmd); 161 162 pte = pte_offset(pmd, addr); 163 printk("pte == %016lx\n", (unsigned long) pte); 164 165 page = *pte; 166 printk("page == %08lx\n", pte_val(page)); 167 168 val = pte_val(page); 169 if (val & _PAGE_PRESENT) printk("present "); 170 if (val & _PAGE_READ) printk("read "); 171 if (val & _PAGE_WRITE) printk("write "); 172 if (val & _PAGE_ACCESSED) printk("accessed "); 173 if (val & _PAGE_MODIFIED) printk("modified "); 174 if (val & _PAGE_R4KBUG) printk("r4kbug "); 175 if (val & _PAGE_GLOBAL) printk("global "); 176 if (val & _PAGE_VALID) printk("valid "); 177 printk("\n"); 178} 179 180void dump_list_current(void *address) 181{ 182 dump_list_process(current, address); 183} 184 185unsigned long vtop(void *address) 186{ 187 pgd_t *pgd; 188 pud_t *pud; 189 pmd_t *pmd; 190 pte_t *pte; 191 unsigned long addr, paddr; 192 193 addr = (unsigned long) address; 194 pgd = pgd_offset(current->mm, addr); 195 pud = pud_offset(pgd, addr); 196 pmd = pmd_offset(pud, addr); 197 pte = pte_offset(pmd, addr); 198 paddr = (CKSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK; 199 paddr |= (addr & ~PAGE_MASK); 200 201 return paddr; 202} 203 204void dump16(unsigned long *p) 205{ 206 int i; 207 208 for (i = 0; i < 8; i++) { 209 printk("*%08lx == %08lx, ", (unsigned long)p, *p); 210 p++; 211 printk("*%08lx == %08lx\n", (unsigned long)p, *p); 212 p++; 213 } 214} 215