diff options
Diffstat (limited to 'arch/mips/lib/r3k_dump_tlb.c')
| -rw-r--r-- | arch/mips/lib/r3k_dump_tlb.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/mips/lib/r3k_dump_tlb.c b/arch/mips/lib/r3k_dump_tlb.c new file mode 100644 index 000000000..fcf594af0 --- /dev/null +++ b/arch/mips/lib/r3k_dump_tlb.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Dump R3000 TLB for debugging purposes. + * + * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle. + * Copyright (C) 1999 by Silicon Graphics, Inc. + * Copyright (C) 1999 by Harald Koerfgen + */ +#include <linux/kernel.h> +#include <linux/mm.h> + +#include <asm/mipsregs.h> +#include <asm/mmu_context.h> +#include <asm/page.h> +#include <asm/tlbdebug.h> + +void dump_tlb_regs(void) +{ + pr_info("Index : %0x\n", read_c0_index()); + pr_info("EntryHi : %0lx\n", read_c0_entryhi()); + pr_info("EntryLo : %0lx\n", read_c0_entrylo0()); +} + +static void dump_tlb(int first, int last) +{ + int i; + unsigned int asid; + unsigned long entryhi, entrylo0, asid_mask; + + asid_mask = cpu_asid_mask(¤t_cpu_data); + asid = read_c0_entryhi() & asid_mask; + + for (i = first; i <= last; i++) { + write_c0_index(i<<8); + __asm__ __volatile__( + ".set\tnoreorder\n\t" + "tlbr\n\t" + "nop\n\t" + ".set\treorder"); + entryhi = read_c0_entryhi(); + entrylo0 = read_c0_entrylo0(); + + /* Unused entries have a virtual address of KSEG0. */ + if ((entryhi & PAGE_MASK) != KSEG0 && + (entrylo0 & R3K_ENTRYLO_G || + (entryhi & asid_mask) == asid)) { + /* + * Only print entries in use + */ + printk("Index: %2d ", i); + + pr_cont("va=%08lx asid=%08lx" + " [pa=%06lx n=%d d=%d v=%d g=%d]", + entryhi & PAGE_MASK, + entryhi & asid_mask, + entrylo0 & PAGE_MASK, + (entrylo0 & R3K_ENTRYLO_N) ? 1 : 0, + (entrylo0 & R3K_ENTRYLO_D) ? 1 : 0, + (entrylo0 & R3K_ENTRYLO_V) ? 1 : 0, + (entrylo0 & R3K_ENTRYLO_G) ? 1 : 0); + } + } + printk("\n"); + + write_c0_entryhi(asid); +} + +void dump_tlb_all(void) +{ + dump_tlb(0, current_cpu_data.tlbsize - 1); +} |