1 files changed, 211 insertions, 0 deletions

diff --git a/arch/mips/lib-64/dump_tlb.c b/arch/mips/lib-64/dump_tlb.c
new file mode 100644
index 000000000000..42f88e055b4c
--- /dev/null
+++ b/arch/mips/lib-64/dump_tlb.c
@@ -0,0 +1,211 @@
+/*
+ * Dump R4x00 TLB for debugging purposes.
+ *
+ * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.
+ * Copyright (C) 1999 by Silicon Graphics, Inc.
+ */
+#include <linux/config.h>
+#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>
+
+static inline const char *msk2str(unsigned int mask)
+{
+        switch (mask) {
+        case PM_4K:     return "4kb";
+        case PM_16K:    return "16kb";
+        case PM_64K:    return "64kb";
+        case PM_256K:   return "256kb";
+#ifndef CONFIG_CPU_VR41XX
+        case PM_1M:     return "1Mb";
+        case PM_4M:     return "4Mb";
+        case PM_16M:    return "16Mb";
+        case PM_64M:    return "64Mb";
+        case PM_256M:   return "256Mb";
+#endif
+        }
+
+        return "unknown";
+}
+
+#define BARRIER()                                       \
+        __asm__ __volatile__(                           \
+                ".set\tnoreorder\n\t"                   \
+                "nop;nop;nop;nop;nop;nop;nop\n\t"       \
+                ".set\treorder");
+
+void dump_tlb(int first, int last)
+{
+        unsigned long s_entryhi, entryhi, entrylo0, entrylo1, asid;
+        unsigned int s_index, pagemask, c0, c1, i;
+
+        s_entryhi = read_c0_entryhi();
+        s_index = read_c0_index();
+        asid = s_entryhi & 0xff;
+
+        for (i = first; i <= last; i++) {
+                write_c0_index(i);
+                BARRIER();
+                tlb_read();
+                BARRIER();
+                pagemask = read_c0_pagemask();
+                entryhi  = read_c0_entryhi();
+                entrylo0 = read_c0_entrylo0();
+                entrylo1 = read_c0_entrylo1();
+
+                /* Unused entries have a virtual address of CKSEG0.  */
+                if ((entryhi & ~0x1ffffUL) != CKSEG0
+                    && (entryhi & 0xff) == asid) {
+                        /*
+                         * Only print entries in use
+                         */
+                        printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
+
+                        c0 = (entrylo0 >> 3) & 7;
+                        c1 = (entrylo1 >> 3) & 7;
+
+                        printk("va=%011lx asid=%02lx\n",
+                               (entryhi & ~0x1fffUL),
+                               entryhi & 0xff);
+                        printk("\t[pa=%011lx c=%d d=%d v=%d g=%ld] ",
+                               (entrylo0 << 6) & PAGE_MASK, c0,
+                               (entrylo0 & 4) ? 1 : 0,
+                               (entrylo0 & 2) ? 1 : 0,
+                               (entrylo0 & 1));
+                        printk("[pa=%011lx c=%d d=%d v=%d g=%ld]\n",
+                               (entrylo1 << 6) & PAGE_MASK, c1,
+                               (entrylo1 & 4) ? 1 : 0,
+                               (entrylo1 & 2) ? 1 : 0,
+                               (entrylo1 & 1));
+                }
+        }
+        printk("\n");
+
+        write_c0_entryhi(s_entryhi);
+        write_c0_index(s_index);
+}
+
+void dump_tlb_all(void)
+{
+        dump_tlb(0, current_cpu_data.tlbsize - 1);
+}
+
+void dump_tlb_wired(void)
+{
+        int     wired;
+
+        wired = read_c0_wired();
+        printk("Wired: %d", wired);
+        dump_tlb(0, read_c0_wired());
+}
+
+void dump_tlb_addr(unsigned long addr)
+{
+        unsigned int flags, oldpid;
+        int index;
+
+        local_irq_save(flags);
+        oldpid = read_c0_entryhi() & 0xff;
+        BARRIER();
+        write_c0_entryhi((addr & PAGE_MASK) | oldpid);
+        BARRIER();
+        tlb_probe();
+        BARRIER();
+        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)
+{
+        dump_tlb(read_c0_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 long addr, val;
+
+        addr = (unsigned long) address;
+
+        printk("Addr                 == %08lx\n", addr);
+        printk("tasks->mm.pgd        == %08lx\n", (unsigned long) t->mm->pgd);
+
+        page_dir = pgd_offset(t->mm, 0);
+        printk("page_dir == %016lx\n", (unsigned long) page_dir);
+
+        pgd = pgd_offset(t->mm, addr);
+        printk("pgd == %016lx\n", (unsigned long) pgd);
+
+        pmd = pmd_offset(pgd, addr);
+        printk("pmd == %016lx\n", (unsigned long) pmd);
+
+        pte = pte_offset(pmd, addr);
+        printk("pte == %016lx\n", (unsigned long) pte);
+
+        page = *pte;
+        printk("page == %08lx\n", 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_R4KBUG) printk("r4kbug ");
+        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 = (CKSEG1 | (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++;
+        }
+}