1 files changed, 176 insertions, 0 deletions

diff --git a/arch/mips/lib-32/r3k_dump_tlb.c b/arch/mips/lib-32/r3k_dump_tlb.c
new file mode 100644
index 000000000000..a878224004e5
--- /dev/null
+++ b/arch/mips/lib-32/r3k_dump_tlb.c
@@ -0,0 +1,176 @@
+/*
+ * 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 <linux/sched.h>
+#include <linux/string.h>
+
+#include <asm/bootinfo.h>
+#include <asm/cachectl.h>
+#include <asm/cpu.h>
+#include <asm/mipsregs.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+extern int r3k_have_wired_reg;  /* defined in tlb-r3k.c */
+
+void dump_tlb(int first, int last)
+{
+        int     i;
+        unsigned int asid;
+        unsigned long entryhi, entrylo0;
+
+        asid = read_c0_entryhi() & 0xfc0;
+
+        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 & 0xffffe000) != 0x80000000
+                    && (entryhi & 0xfc0) == asid) {
+                        /*
+                         * Only print entries in use
+                         */
+                        printk("Index: %2d ", i);
+
+                        printk("va=%08lx asid=%08lx"
+                               "  [pa=%06lx n=%d d=%d v=%d g=%d]",
+                               (entryhi & 0xffffe000),
+                               entryhi & 0xfc0,
+                               entrylo0 & PAGE_MASK,
+                               (entrylo0 & (1 << 11)) ? 1 : 0,
+                               (entrylo0 & (1 << 10)) ? 1 : 0,
+                               (entrylo0 & (1 << 9)) ? 1 : 0,
+                               (entrylo0 & (1 << 8)) ? 1 : 0);
+                }
+        }
+        printk("\n");
+
+        write_c0_entryhi(asid);
+}
+
+void dump_tlb_all(void)
+{
+        dump_tlb(0, current_cpu_data.tlbsize - 1);
+}
+
+void dump_tlb_wired(void)
+{
+        int wired = r3k_have_wired_reg ? read_c0_wired() : 8;
+
+        printk("Wired: %d", wired);
+        dump_tlb(0, wired - 1);
+}
+
+void dump_tlb_addr(unsigned long addr)
+{
+        unsigned long flags, oldpid;
+        int index;
+
+        local_irq_save(flags);
+        oldpid = read_c0_entryhi() & 0xff;
+        write_c0_entryhi((addr & PAGE_MASK) | oldpid);
+        tlb_probe();
+        index = read_c0_index();
+        write_c0_entryhi(oldpid);
+        local_irq_restore(flags);
+
+        if (index < 0) {
+                printk("No entry for address 0x%08lx in TLB\n", addr);
+                return;
+        }
+
+        printk("Entry %d maps address 0x%08lx\n", index, addr);
+        dump_tlb(index, index);
+}
+
+void dump_tlb_nonwired(void)
+{
+        int wired = r3k_have_wired_reg ? read_c0_wired() : 8;
+        dump_tlb(wired, current_cpu_data.tlbsize - 1);
+}
+
+void dump_list_process(struct task_struct *t, void *address)
+{
+        pgd_t   *page_dir, *pgd;
+        pmd_t   *pmd;
+        pte_t   *pte, page;
+        unsigned int addr;
+        unsigned long val;
+
+        addr = (unsigned int) address;
+
+        printk("Addr                 == %08x\n", addr);
+        printk("tasks->mm.pgd        == %08x\n", (unsigned int) t->mm->pgd);
+
+        page_dir = pgd_offset(t->mm, 0);
+        printk("page_dir == %08x\n", (unsigned int) page_dir);
+
+        pgd = pgd_offset(t->mm, addr);
+        printk("pgd == %08x, ", (unsigned int) pgd);
+
+        pmd = pmd_offset(pgd, addr);
+        printk("pmd == %08x, ", (unsigned int) pmd);
+
+        pte = pte_offset(pmd, addr);
+        printk("pte == %08x, ", (unsigned int) pte);
+
+        page = *pte;
+        printk("page == %08x\n", (unsigned int) pte_val(page));
+
+        val = pte_val(page);
+        if (val & _PAGE_PRESENT) printk("present ");
+        if (val & _PAGE_READ) printk("read ");
+        if (val & _PAGE_WRITE) printk("write ");
+        if (val & _PAGE_ACCESSED) printk("accessed ");
+        if (val & _PAGE_MODIFIED) printk("modified ");
+        if (val & _PAGE_GLOBAL) printk("global ");
+        if (val & _PAGE_VALID) printk("valid ");
+        printk("\n");
+}
+
+void dump_list_current(void *address)
+{
+        dump_list_process(current, address);
+}
+
+unsigned int vtop(void *address)
+{
+        pgd_t   *pgd;
+        pmd_t   *pmd;
+        pte_t   *pte;
+        unsigned int addr, paddr;
+
+        addr = (unsigned long) address;
+        pgd = pgd_offset(current->mm, addr);
+        pmd = pmd_offset(pgd, addr);
+        pte = pte_offset(pmd, addr);
+        paddr = (KSEG1 | (unsigned int) pte_val(*pte)) & PAGE_MASK;
+        paddr |= (addr & ~PAGE_MASK);
+
+        return paddr;
+}
+
+void dump16(unsigned long *p)
+{
+        int i;
+
+        for (i = 0; i < 8; i++) {
+                printk("*%08lx == %08lx, ", (unsigned long)p, *p);
+                p++;
+                printk("*%08lx == %08lx\n", (unsigned long)p, *p);
+                p++;
+        }
+}