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/*

 * 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/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";

        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";

        }

}

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);

                __asm__ __volatile__(

                        ".set\tnoreorder\n\t"

                        "nop;nop;nop;nop\n\t"

                        "tlbr\n\t"

                        "nop;nop;nop;nop\n\t"

                        ".set\treorder");

                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());

}

#define BARRIER                                         \

        __asm__ __volatile__(                           \

                ".set\tnoreorder\n\t"                   \

                "nop;nop;nop;nop;nop;nop;nop\n\t"       \

                ".set\treorder");

void dump_tlb_addr(unsigned long addr)

{

        unsigned long 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;

        unsigned long 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 == %08lx\n", (unsigned long) page_dir);

        pgd = pgd_offset(t->mm, addr);

        printk("pgd == %08lx, ", (unsigned long) pgd);

        pmd = pmd_offset(pgd, addr);

        printk("pmd == %08lx, ", (unsigned long) pmd);

        pte = pte_offset(pmd, addr);

        printk("pte == %08lx, ", (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 = (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, (unsigned long)*p);

                p++;

                printk("*%08lx == %08lx\n",

                       (unsigned long)p, (unsigned long)*p);

                p++;

        }

}