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 #include <asm/tlbdebug.h> 14 #include <asm/mmu_context.h> 15 16 static inline const char *msk2str(unsigned int mask) 17 { 18 switch (mask) { 19 case PM_4K: return "4kb"; 20 case PM_16K: return "16kb"; 21 case PM_64K: return "64kb"; 22 case PM_256K: return "256kb"; 23 #ifdef CONFIG_CPU_CAVIUM_OCTEON 24 case PM_8K: return "8kb"; 25 case PM_32K: return "32kb"; 26 case PM_128K: return "128kb"; 27 case PM_512K: return "512kb"; 28 case PM_2M: return "2Mb"; 29 case PM_8M: return "8Mb"; 30 case PM_32M: return "32Mb"; 31 #endif 32 #ifndef CONFIG_CPU_VR41XX 33 case PM_1M: return "1Mb"; 34 case PM_4M: return "4Mb"; 35 case PM_16M: return "16Mb"; 36 case PM_64M: return "64Mb"; 37 case PM_256M: return "256Mb"; 38 case PM_1G: return "1Gb"; 39 #endif 40 } 41 return ""; 42 } 43 44 #define BARRIER() \ 45 __asm__ __volatile__( \ 46 ".set\tnoreorder\n\t" \ 47 "nop;nop;nop;nop;nop;nop;nop\n\t" \ 48 ".set\treorder"); 49 50 static void dump_tlb(int first, int last) 51 { 52 unsigned long s_entryhi, entryhi, asid; 53 unsigned long long entrylo0, entrylo1; 54 unsigned int s_index, s_pagemask, pagemask, c0, c1, i; 55 56 s_pagemask = read_c0_pagemask(); 57 s_entryhi = read_c0_entryhi(); 58 s_index = read_c0_index(); 59 asid = ASID_MASK(s_entryhi); 60 61 for (i = first; i <= last; i++) { 62 write_c0_index(i); 63 BARRIER(); 64 tlb_read(); 65 BARRIER(); 66 pagemask = read_c0_pagemask(); 67 entryhi = read_c0_entryhi(); 68 entrylo0 = read_c0_entrylo0(); 69 entrylo1 = read_c0_entrylo1(); 70 71 /* Unused entries have a virtual address of CKSEG0. */ 72 if ((entryhi & ~0x1ffffUL) != CKSEG0 73 && (entryhi & 0xff) == asid) { 74 #ifdef CONFIG_32BIT 75 int width = 8; 76 #else 77 int width = 11; 78 #endif 79 /* 80 * Only print entries in use 81 */ 82 printk("Index: %2d pgmask=%s ", i, msk2str(pagemask)); 83 84 c0 = (entrylo0 >> 3) & 7; 85 c1 = (entrylo1 >> 3) & 7; 86 87 printk("va=%0*lx asid=%02lx\n", 88 width, (entryhi & ~0x1fffUL), 89 ASID_MASK(entryhi)); 90 printk("\t[pa=%0*llx c=%d d=%d v=%d g=%d] ", 91 width, 92 (entrylo0 << 6) & PAGE_MASK, c0, 93 (entrylo0 & 4) ? 1 : 0, 94 (entrylo0 & 2) ? 1 : 0, 95 (entrylo0 & 1) ? 1 : 0); 96 printk("[pa=%0*llx c=%d d=%d v=%d g=%d]\n", 97 width, 98 (entrylo1 << 6) & PAGE_MASK, c1, 99 (entrylo1 & 4) ? 1 : 0, 100 (entrylo1 & 2) ? 1 : 0, 101 (entrylo1 & 1) ? 1 : 0); 102 } 103 } 104 printk("\n"); 105 106 write_c0_entryhi(s_entryhi); 107 write_c0_index(s_index); 108 write_c0_pagemask(s_pagemask); 109 } 110 111 void dump_tlb_all(void) 112 { 113 dump_tlb(0, current_cpu_data.tlbsize - 1); 114 } 115