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/pgtable.h> 16 #include <asm/tlbdebug.h> 17 18 extern int r3k_have_wired_reg; 19 20 void dump_tlb_regs(void) 21 { 22 pr_info("Index : %0x\n", read_c0_index()); 23 pr_info("EntryHi : %0lx\n", read_c0_entryhi()); 24 pr_info("EntryLo : %0lx\n", read_c0_entrylo0()); 25 if (r3k_have_wired_reg) 26 pr_info("Wired : %0x\n", read_c0_wired()); 27 } 28 29 static void dump_tlb(int first, int last) 30 { 31 int i; 32 unsigned int asid; 33 unsigned long entryhi, entrylo0, asid_mask; 34 35 asid_mask = cpu_asid_mask(¤t_cpu_data); 36 asid = read_c0_entryhi() & asid_mask; 37 38 for (i = first; i <= last; i++) { 39 write_c0_index(i<<8); 40 __asm__ __volatile__( 41 ".set\tnoreorder\n\t" 42 "tlbr\n\t" 43 "nop\n\t" 44 ".set\treorder"); 45 entryhi = read_c0_entryhi(); 46 entrylo0 = read_c0_entrylo0(); 47 48 /* Unused entries have a virtual address of KSEG0. */ 49 if ((entryhi & PAGE_MASK) != KSEG0 && 50 (entrylo0 & R3K_ENTRYLO_G || 51 (entryhi & asid_mask) == asid)) { 52 /* 53 * Only print entries in use 54 */ 55 printk("Index: %2d ", i); 56 57 pr_cont("va=%08lx asid=%08lx" 58 " [pa=%06lx n=%d d=%d v=%d g=%d]", 59 entryhi & PAGE_MASK, 60 entryhi & asid_mask, 61 entrylo0 & PAGE_MASK, 62 (entrylo0 & R3K_ENTRYLO_N) ? 1 : 0, 63 (entrylo0 & R3K_ENTRYLO_D) ? 1 : 0, 64 (entrylo0 & R3K_ENTRYLO_V) ? 1 : 0, 65 (entrylo0 & R3K_ENTRYLO_G) ? 1 : 0); 66 } 67 } 68 printk("\n"); 69 70 write_c0_entryhi(asid); 71 } 72 73 void dump_tlb_all(void) 74 { 75 dump_tlb(0, current_cpu_data.tlbsize - 1); 76 } 77