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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
commit76cb841cb886eef6b3bee341a2266c76578724ad (patch)
treef5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /arch/mips/lib/r3k_dump_tlb.c
parentInitial commit. (diff)
downloadlinux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz
linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip
Adding upstream version 4.19.249.upstream/4.19.249upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--arch/mips/lib/r3k_dump_tlb.c76
1 files changed, 76 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..b97d9c5d8
--- /dev/null
+++ b/arch/mips/lib/r3k_dump_tlb.c
@@ -0,0 +1,76 @@
+// 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/pgtable.h>
+#include <asm/tlbdebug.h>
+
+extern int r3k_have_wired_reg;
+
+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());
+ if (r3k_have_wired_reg)
+ pr_info("Wired : %0x\n", read_c0_wired());
+}
+
+static void dump_tlb(int first, int last)
+{
+ int i;
+ unsigned int asid;
+ unsigned long entryhi, entrylo0, asid_mask;
+
+ asid_mask = cpu_asid_mask(&current_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);
+}