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/hazards.h> 11 #include <asm/mipsregs.h> 12 #include <asm/page.h> 13 #include <asm/pgtable.h> 14 #include <asm/tlbdebug.h> 15 16 void dump_tlb_regs(void) 17 { 18 const int field = 2 * sizeof(unsigned long); 19 20 pr_info("Index : %0x\n", read_c0_index()); 21 pr_info("PageMask : %0x\n", read_c0_pagemask()); 22 pr_info("EntryHi : %0*lx\n", field, read_c0_entryhi()); 23 pr_info("EntryLo0 : %0*lx\n", field, read_c0_entrylo0()); 24 pr_info("EntryLo1 : %0*lx\n", field, read_c0_entrylo1()); 25 pr_info("Wired : %0x\n", read_c0_wired()); 26 switch (current_cpu_type()) { 27 case CPU_R10000: 28 case CPU_R12000: 29 case CPU_R14000: 30 case CPU_R16000: 31 pr_info("FrameMask: %0x\n", read_c0_framemask()); 32 break; 33 } 34 if (cpu_has_small_pages || cpu_has_rixi || cpu_has_xpa) 35 pr_info("PageGrain: %0x\n", read_c0_pagegrain()); 36 if (cpu_has_htw) { 37 pr_info("PWField : %0*lx\n", field, read_c0_pwfield()); 38 pr_info("PWSize : %0*lx\n", field, read_c0_pwsize()); 39 pr_info("PWCtl : %0x\n", read_c0_pwctl()); 40 } 41 } 42 43 static inline const char *msk2str(unsigned int mask) 44 { 45 switch (mask) { 46 case PM_4K: return "4kb"; 47 case PM_16K: return "16kb"; 48 case PM_64K: return "64kb"; 49 case PM_256K: return "256kb"; 50 #ifdef CONFIG_CPU_CAVIUM_OCTEON 51 case PM_8K: return "8kb"; 52 case PM_32K: return "32kb"; 53 case PM_128K: return "128kb"; 54 case PM_512K: return "512kb"; 55 case PM_2M: return "2Mb"; 56 case PM_8M: return "8Mb"; 57 case PM_32M: return "32Mb"; 58 #endif 59 #ifndef CONFIG_CPU_VR41XX 60 case PM_1M: return "1Mb"; 61 case PM_4M: return "4Mb"; 62 case PM_16M: return "16Mb"; 63 case PM_64M: return "64Mb"; 64 case PM_256M: return "256Mb"; 65 case PM_1G: return "1Gb"; 66 #endif 67 } 68 return ""; 69 } 70 71 static void dump_tlb(int first, int last) 72 { 73 unsigned long s_entryhi, entryhi, asid; 74 unsigned long long entrylo0, entrylo1, pa; 75 unsigned int s_index, s_pagemask, pagemask, c0, c1, i; 76 #ifdef CONFIG_32BIT 77 bool xpa = cpu_has_xpa && (read_c0_pagegrain() & PG_ELPA); 78 int pwidth = xpa ? 11 : 8; 79 int vwidth = 8; 80 #else 81 bool xpa = false; 82 int pwidth = 11; 83 int vwidth = 11; 84 #endif 85 86 s_pagemask = read_c0_pagemask(); 87 s_entryhi = read_c0_entryhi(); 88 s_index = read_c0_index(); 89 asid = s_entryhi & 0xff; 90 91 for (i = first; i <= last; i++) { 92 write_c0_index(i); 93 mtc0_tlbr_hazard(); 94 tlb_read(); 95 tlb_read_hazard(); 96 pagemask = read_c0_pagemask(); 97 entryhi = read_c0_entryhi(); 98 entrylo0 = read_c0_entrylo0(); 99 entrylo1 = read_c0_entrylo1(); 100 101 /* EHINV bit marks entire entry as invalid */ 102 if (cpu_has_tlbinv && entryhi & MIPS_ENTRYHI_EHINV) 103 continue; 104 /* 105 * Prior to tlbinv, unused entries have a virtual address of 106 * CKSEG0. 107 */ 108 if ((entryhi & ~0x1ffffUL) == CKSEG0) 109 continue; 110 /* 111 * ASID takes effect in absence of G (global) bit. 112 * We check both G bits, even though architecturally they should 113 * match one another, because some revisions of the SB1 core may 114 * leave only a single G bit set after a machine check exception 115 * due to duplicate TLB entry. 116 */ 117 if (!((entrylo0 | entrylo1) & ENTRYLO_G) && 118 (entryhi & 0xff) != asid) 119 continue; 120 121 /* 122 * Only print entries in use 123 */ 124 printk("Index: %2d pgmask=%s ", i, msk2str(pagemask)); 125 126 c0 = (entrylo0 & ENTRYLO_C) >> ENTRYLO_C_SHIFT; 127 c1 = (entrylo1 & ENTRYLO_C) >> ENTRYLO_C_SHIFT; 128 129 printk("va=%0*lx asid=%02lx\n", 130 vwidth, (entryhi & ~0x1fffUL), 131 entryhi & 0xff); 132 /* RI/XI are in awkward places, so mask them off separately */ 133 pa = entrylo0 & ~(MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI); 134 if (xpa) 135 pa |= (unsigned long long)readx_c0_entrylo0() << 30; 136 pa = (pa << 6) & PAGE_MASK; 137 printk("\t["); 138 if (cpu_has_rixi) 139 printk("ri=%d xi=%d ", 140 (entrylo0 & MIPS_ENTRYLO_RI) ? 1 : 0, 141 (entrylo0 & MIPS_ENTRYLO_XI) ? 1 : 0); 142 printk("pa=%0*llx c=%d d=%d v=%d g=%d] [", 143 pwidth, pa, c0, 144 (entrylo0 & ENTRYLO_D) ? 1 : 0, 145 (entrylo0 & ENTRYLO_V) ? 1 : 0, 146 (entrylo0 & ENTRYLO_G) ? 1 : 0); 147 /* RI/XI are in awkward places, so mask them off separately */ 148 pa = entrylo1 & ~(MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI); 149 if (xpa) 150 pa |= (unsigned long long)readx_c0_entrylo1() << 30; 151 pa = (pa << 6) & PAGE_MASK; 152 if (cpu_has_rixi) 153 printk("ri=%d xi=%d ", 154 (entrylo1 & MIPS_ENTRYLO_RI) ? 1 : 0, 155 (entrylo1 & MIPS_ENTRYLO_XI) ? 1 : 0); 156 printk("pa=%0*llx c=%d d=%d v=%d g=%d]\n", 157 pwidth, pa, c1, 158 (entrylo1 & ENTRYLO_D) ? 1 : 0, 159 (entrylo1 & ENTRYLO_V) ? 1 : 0, 160 (entrylo1 & ENTRYLO_G) ? 1 : 0); 161 } 162 printk("\n"); 163 164 write_c0_entryhi(s_entryhi); 165 write_c0_index(s_index); 166 write_c0_pagemask(s_pagemask); 167 } 168 169 void dump_tlb_all(void) 170 { 171 dump_tlb(0, current_cpu_data.tlbsize - 1); 172 } 173