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 case PM_1M: return "1Mb"; 27 case PM_4M: return "4Mb"; 28 case PM_16M: return "16Mb"; 29 case PM_64M: return "64Mb"; 30 case PM_256M: return "256Mb"; 31 } 32} 33 34void dump_tlb(int first, int last) 35{ 36 unsigned long s_entryhi, entryhi, entrylo0, entrylo1, asid; 37 unsigned int s_index, pagemask, c0, c1, i; 38 39 s_entryhi = read_c0_entryhi(); 40 s_index = read_c0_index(); 41 asid = s_entryhi & 0xff; 42 43 for (i = first; i <= last; i++) { 44 write_c0_index(i); 45 __asm__ __volatile__( 46 ".set\tnoreorder\n\t" 47 "nop;nop;nop;nop\n\t" 48 "tlbr\n\t" 49 "nop;nop;nop;nop\n\t" 50 ".set\treorder"); 51 pagemask = read_c0_pagemask(); 52 entryhi = read_c0_entryhi(); 53 entrylo0 = read_c0_entrylo0(); 54 entrylo1 = read_c0_entrylo1(); 55 56 /* Unused entries have a virtual address of CKSEG0. */ 57 if ((entryhi & ~0x1ffffUL) != CKSEG0 58 && (entryhi & 0xff) == asid) { 59 /* 60 * Only print entries in use 61 */ 62 printk("Index: %2d pgmask=%s ", i, msk2str(pagemask)); 63 64 c0 = (entrylo0 >> 3) & 7; 65 c1 = (entrylo1 >> 3) & 7; 66 67 printk("va=%011lx asid=%02lx\n", 68 (entryhi & ~0x1fffUL), 69 entryhi & 0xff); 70 printk("\t[pa=%011lx c=%d d=%d v=%d g=%ld] ", 71 (entrylo0 << 6) & PAGE_MASK, c0, 72 (entrylo0 & 4) ? 1 : 0, 73 (entrylo0 & 2) ? 1 : 0, 74 (entrylo0 & 1)); 75 printk("[pa=%011lx c=%d d=%d v=%d g=%ld]\n", 76 (entrylo1 << 6) & PAGE_MASK, c1, 77 (entrylo1 & 4) ? 1 : 0, 78 (entrylo1 & 2) ? 1 : 0, 79 (entrylo1 & 1)); 80 } 81 } 82 printk("\n"); 83 84 write_c0_entryhi(s_entryhi); 85 write_c0_index(s_index); 86} 87 88void dump_tlb_all(void) 89{ 90 dump_tlb(0, mips_cpu.tlbsize - 1); 91} 92 93void dump_tlb_wired(void) 94{ 95 int wired; 96 97 wired = read_c0_wired(); 98 printk("Wired: %d", wired); 99 dump_tlb(0, read_c0_wired()); 100} 101 102#define BARRIER \ 103 __asm__ __volatile__( \ 104 ".set\tnoreorder\n\t" \ 105 "nop;nop;nop;nop;nop;nop;nop\n\t" \ 106 ".set\treorder"); 107 108void dump_tlb_addr(unsigned long addr) 109{ 110 unsigned int flags, oldpid; 111 int index; 112 113 __save_and_cli(flags); 114 oldpid = read_c0_entryhi() & 0xff; 115 BARRIER; 116 write_c0_entryhi((addr & PAGE_MASK) | oldpid); 117 BARRIER; 118 tlb_probe(); 119 BARRIER; 120 index = read_c0_index(); 121 write_c0_entryhi(oldpid); 122 __restore_flags(flags); 123 124 if (index < 0) { 125 printk("No entry for address 0x%08lx in TLB\n", addr); 126 return; 127 } 128 129 printk("Entry %d maps address 0x%08lx\n", index, addr); 130 dump_tlb(index, index); 131} 132 133void dump_tlb_nonwired(void) 134{ 135 dump_tlb(read_c0_wired(), mips_cpu.tlbsize - 1); 136} 137 138void dump_list_process(struct task_struct *t, void *address) 139{ 140 pgd_t *page_dir, *pgd; 141 pmd_t *pmd; 142 pte_t *pte, page; 143 unsigned long addr; 144 unsigned long val; 145 146 addr = (unsigned long) address; 147 148 printk("Addr == %08lx\n", addr); 149 printk("tasks->mm.pgd == %08lx\n", (unsigned long) t->mm->pgd); 150 151 page_dir = pgd_offset(t->mm, 0); 152 printk("page_dir == %08lx\n", (unsigned long) page_dir); 153 154 pgd = pgd_offset(t->mm, addr); 155 printk("pgd == %08lx, ", (unsigned long) pgd); 156 157 pmd = pmd_offset(pgd, addr); 158 printk("pmd == %08lx, ", (unsigned long) pmd); 159 160 pte = pte_offset(pmd, addr); 161 printk("pte == %08lx, ", (unsigned long) pte); 162 163 page = *pte; 164 printk("page == %08lx\n", pte_val(page)); 165 166 val = pte_val(page); 167 if (val & _PAGE_PRESENT) printk("present "); 168 if (val & _PAGE_READ) printk("read "); 169 if (val & _PAGE_WRITE) printk("write "); 170 if (val & _PAGE_ACCESSED) printk("accessed "); 171 if (val & _PAGE_MODIFIED) printk("modified "); 172 if (val & _PAGE_R4KBUG) printk("r4kbug "); 173 if (val & _PAGE_GLOBAL) printk("global "); 174 if (val & _PAGE_VALID) printk("valid "); 175 printk("\n"); 176} 177 178void dump_list_current(void *address) 179{ 180 dump_list_process(current, address); 181} 182 183unsigned int vtop(void *address) 184{ 185 pgd_t *pgd; 186 pmd_t *pmd; 187 pte_t *pte; 188 unsigned int addr, paddr; 189 190 addr = (unsigned long) address; 191 pgd = pgd_offset(current->mm, addr); 192 pmd = pmd_offset(pgd, addr); 193 pte = pte_offset(pmd, addr); 194 paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK; 195 paddr |= (addr & ~PAGE_MASK); 196 197 return paddr; 198} 199 200void dump16(unsigned long *p) 201{ 202 int i; 203 204 for(i = 0; i < 8; i++) { 205 printk("*%08lx == %08lx, ", 206 (unsigned long)p, (unsigned long)*p); 207 p++; 208 printk("*%08lx == %08lx\n", 209 (unsigned long)p, (unsigned long)*p); 210 p++; 211 } 212} 213