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 10 #include <asm/mipsregs.h> 11 #include <asm/page.h> 12 #include <asm/pgtable.h> 13 14 static inline const char *msk2str(unsigned int mask) 15 { 16 switch (mask) { 17 case PM_4K: return "4kb"; 18 case PM_16K: return "16kb"; 19 case PM_64K: return "64kb"; 20 case PM_256K: return "256kb"; 21 #ifndef CONFIG_CPU_VR41XX 22 case PM_1M: return "1Mb"; 23 case PM_4M: return "4Mb"; 24 case PM_16M: return "16Mb"; 25 case PM_64M: return "64Mb"; 26 case PM_256M: return "256Mb"; 27 #endif 28 } 29 return ""; 30 } 31 32 #define BARRIER() \ 33 __asm__ __volatile__( \ 34 ".set\tnoreorder\n\t" \ 35 "nop;nop;nop;nop;nop;nop;nop\n\t" \ 36 ".set\treorder"); 37 38 static void dump_tlb(int first, int last) 39 { 40 unsigned long s_entryhi, entryhi, asid; 41 unsigned long long entrylo0, entrylo1; 42 unsigned int s_index, pagemask, c0, c1, i; 43 44 s_entryhi = read_c0_entryhi(); 45 s_index = read_c0_index(); 46 asid = s_entryhi & 0xff; 47 48 for (i = first; i <= last; i++) { 49 write_c0_index(i); 50 BARRIER(); 51 tlb_read(); 52 BARRIER(); 53 pagemask = read_c0_pagemask(); 54 entryhi = read_c0_entryhi(); 55 entrylo0 = read_c0_entrylo0(); 56 entrylo1 = read_c0_entrylo1(); 57 58 /* Unused entries have a virtual address of CKSEG0. */ 59 if ((entryhi & ~0x1ffffUL) != CKSEG0 60 && (entryhi & 0xff) == asid) { 61 #ifdef CONFIG_32BIT 62 int width = 8; 63 #else 64 int width = 11; 65 #endif 66 /* 67 * Only print entries in use 68 */ 69 printk("Index: %2d pgmask=%s ", i, msk2str(pagemask)); 70 71 c0 = (entrylo0 >> 3) & 7; 72 c1 = (entrylo1 >> 3) & 7; 73 74 printk("va=%0*lx asid=%02lx\n", 75 width, (entryhi & ~0x1fffUL), 76 entryhi & 0xff); 77 printk("\t[pa=%0*llx c=%d d=%d v=%d g=%d] ", 78 width, 79 (entrylo0 << 6) & PAGE_MASK, c0, 80 (entrylo0 & 4) ? 1 : 0, 81 (entrylo0 & 2) ? 1 : 0, 82 (entrylo0 & 1) ? 1 : 0); 83 printk("[pa=%0*llx c=%d d=%d v=%d g=%d]\n", 84 width, 85 (entrylo1 << 6) & PAGE_MASK, c1, 86 (entrylo1 & 4) ? 1 : 0, 87 (entrylo1 & 2) ? 1 : 0, 88 (entrylo1 & 1) ? 1 : 0); 89 } 90 } 91 printk("\n"); 92 93 write_c0_entryhi(s_entryhi); 94 write_c0_index(s_index); 95 } 96 97 void dump_tlb_all(void) 98 { 99 dump_tlb(0, current_cpu_data.tlbsize - 1); 100 } 101