1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Dump R3000 TLB for debugging purposes. 4 * 5 * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle. 6 * Copyright (C) 1999 by Silicon Graphics, Inc. 7 * Copyright (C) 1999 by Harald Koerfgen 8 */ 9 #include <linux/kernel.h> 10 #include <linux/mm.h> 11 12 #include <asm/mipsregs.h> 13 #include <asm/mmu_context.h> 14 #include <asm/page.h> 15 #include <asm/tlbdebug.h> 16 17 extern int r3k_have_wired_reg; 18 19 void dump_tlb_regs(void) 20 { 21 pr_info("Index : %0x\n", read_c0_index()); 22 pr_info("EntryHi : %0lx\n", read_c0_entryhi()); 23 pr_info("EntryLo : %0lx\n", read_c0_entrylo0()); 24 if (r3k_have_wired_reg) 25 pr_info("Wired : %0x\n", read_c0_wired()); 26 } 27 28 static void dump_tlb(int first, int last) 29 { 30 int i; 31 unsigned int asid; 32 unsigned long entryhi, entrylo0, asid_mask; 33 34 asid_mask = cpu_asid_mask(¤t_cpu_data); 35 asid = read_c0_entryhi() & asid_mask; 36 37 for (i = first; i <= last; i++) { 38 write_c0_index(i<<8); 39 __asm__ __volatile__( 40 ".set\tnoreorder\n\t" 41 "tlbr\n\t" 42 "nop\n\t" 43 ".set\treorder"); 44 entryhi = read_c0_entryhi(); 45 entrylo0 = read_c0_entrylo0(); 46 47 /* Unused entries have a virtual address of KSEG0. */ 48 if ((entryhi & PAGE_MASK) != KSEG0 && 49 (entrylo0 & R3K_ENTRYLO_G || 50 (entryhi & asid_mask) == asid)) { 51 /* 52 * Only print entries in use 53 */ 54 printk("Index: %2d ", i); 55 56 pr_cont("va=%08lx asid=%08lx" 57 " [pa=%06lx n=%d d=%d v=%d g=%d]", 58 entryhi & PAGE_MASK, 59 entryhi & asid_mask, 60 entrylo0 & PAGE_MASK, 61 (entrylo0 & R3K_ENTRYLO_N) ? 1 : 0, 62 (entrylo0 & R3K_ENTRYLO_D) ? 1 : 0, 63 (entrylo0 & R3K_ENTRYLO_V) ? 1 : 0, 64 (entrylo0 & R3K_ENTRYLO_G) ? 1 : 0); 65 } 66 } 67 printk("\n"); 68 69 write_c0_entryhi(asid); 70 } 71 72 void dump_tlb_all(void) 73 { 74 dump_tlb(0, current_cpu_data.tlbsize - 1); 75 } 76