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/*

 * Copyright (c) 2005 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup sparc64mm  

 * @{

 */

/** @file

 */

#include <arch/mm/tlb.h>

#include <mm/tlb.h>

#include <mm/as.h>

#include <mm/asid.h>

#include <arch/mm/frame.h>

#include <arch/mm/page.h>

#include <arch/mm/mmu.h>

#include <arch/interrupt.h>

#include <interrupt.h>

#include <arch.h>

#include <print.h>

#include <arch/types.h>

#include <config.h>

#include <arch/trap/trap.h>

#include <arch/trap/exception.h>

#include <panic.h>

#include <arch/asm.h>

#ifdef CONFIG_TSB

#include <arch/mm/tsb.h>

#endif

static void dtlb_pte_copy(pte_t *, size_t, bool);

static void itlb_pte_copy(pte_t *, size_t);

static void do_fast_instruction_access_mmu_miss_fault(istate_t *, const char *);

static void do_fast_data_access_mmu_miss_fault(istate_t *, tlb_tag_access_reg_t,

    const char *);

static void do_fast_data_access_protection_fault(istate_t *,

    tlb_tag_access_reg_t, const char *);

char *context_encoding[] = {

    "Primary",

    "Secondary",

    "Nucleus",

    "Reserved"

};

void tlb_arch_init(void)

{

    /*

     * Invalidate all non-locked DTLB and ITLB entries.

     */

    tlb_invalidate_all();

    /*

     * Clear both SFSRs.

     */

    dtlb_sfsr_write(0);

    itlb_sfsr_write(0);

}

/** Insert privileged mapping into DMMU TLB.

 *

 * @param page      Virtual page address.

 * @param frame     Physical frame address.

 * @param pagesize  Page size.

 * @param locked    True for permanent mappings, false otherwise.

 * @param cacheable True if the mapping is cacheable, false otherwise.

 */

void dtlb_insert_mapping(uintptr_t page, uintptr_t frame, int pagesize,

    bool locked, bool cacheable)

{

    tlb_tag_access_reg_t tag;

    tlb_data_t data;

    page_address_t pg;

    frame_address_t fr;

    pg.address = page;

    fr.address = frame;

    tag.context = ASID_KERNEL;

    tag.vpn = pg.vpn;

    dtlb_tag_access_write(tag.value);

    data.value = 0;

    data.v = true;

    data.size = pagesize;

    data.pfn = fr.pfn;

    data.l = locked;

    data.cp = cacheable;

#ifdef CONFIG_VIRT_IDX_DCACHE

    data.cv = cacheable;

#endif /* CONFIG_VIRT_IDX_DCACHE */

    data.p = true;

    data.w = true;

    data.g = false;

    dtlb_data_in_write(data.value);

}

/** Copy PTE to TLB.

 *

 * @param t         Page Table Entry to be copied.

 * @param index     Zero if lower 8K-subpage, one if higher 8K-subpage.

 * @param ro        If true, the entry will be created read-only, regardless

 *          of its w field.

 */

void dtlb_pte_copy(pte_t *t, size_t index, bool ro)

{

    tlb_tag_access_reg_t tag;

    tlb_data_t data;

    page_address_t pg;

    frame_address_t fr;

    pg.address = t->page + (index << MMU_PAGE_WIDTH);

    fr.address = t->frame + (index << MMU_PAGE_WIDTH);

    tag.value = 0;

    tag.context = t->as->asid;

    tag.vpn = pg.vpn;

    dtlb_tag_access_write(tag.value);

    data.value = 0;

    data.v = true;

    data.size = PAGESIZE_8K;

    data.pfn = fr.pfn;

    data.l = false;

    data.cp = t->c;

#ifdef CONFIG_VIRT_IDX_DCACHE

    data.cv = t->c;

#endif /* CONFIG_VIRT_IDX_DCACHE */

    data.p = t->k;      /* p like privileged */

    data.w = ro ? false : t->w;

    data.g = t->g;

    dtlb_data_in_write(data.value);

}

/** Copy PTE to ITLB.

 *

 * @param t     Page Table Entry to be copied.

 * @param index     Zero if lower 8K-subpage, one if higher 8K-subpage.

 */

void itlb_pte_copy(pte_t *t, size_t index)

{

    tlb_tag_access_reg_t tag;

    tlb_data_t data;

    page_address_t pg;

    frame_address_t fr;

    pg.address = t->page + (index << MMU_PAGE_WIDTH);

    fr.address = t->frame + (index << MMU_PAGE_WIDTH);

    tag.value = 0;

    tag.context = t->as->asid;

    tag.vpn = pg.vpn;

    itlb_tag_access_write(tag.value);

    data.value = 0;

    data.v = true;

    data.size = PAGESIZE_8K;

    data.pfn = fr.pfn;

    data.l = false;

    data.cp = t->c;

    data.p = t->k;      /* p like privileged */

    data.w = false;

    data.g = t->g;

    itlb_data_in_write(data.value);

}

/** ITLB miss handler. */

void fast_instruction_access_mmu_miss(unative_t unused, istate_t *istate)

{

    uintptr_t page_16k = ALIGN_DOWN(istate->tpc, PAGE_SIZE);

    size_t index = (istate->tpc >> MMU_PAGE_WIDTH) % MMU_PAGES_PER_PAGE;

    pte_t *t;

    page_table_lock(AS, true);

    t = page_mapping_find(AS, page_16k);

    if (t && PTE_EXECUTABLE(t)) {

        /*

         * The mapping was found in the software page hash table.

         * Insert it into ITLB.

         */

        t->a = true;

        itlb_pte_copy(t, index);

#ifdef CONFIG_TSB

        itsb_pte_copy(t, index);

#endif

        page_table_unlock(AS, true);

    } else {

        /*

         * Forward the page fault to the address space page fault

         * handler.

         */    

        page_table_unlock(AS, true);

        if (as_page_fault(page_16k, PF_ACCESS_EXEC, istate) ==

            AS_PF_FAULT) {

            do_fast_instruction_access_mmu_miss_fault(istate,

                __func__);

        }

    }

}

/** DTLB miss handler.

 *

 * Note that some faults (e.g. kernel faults) were already resolved by the

 * low-level, assembly language part of the fast_data_access_mmu_miss handler.

 *

 * @param tag       Content of the TLB Tag Access register as it existed

 *          when the trap happened. This is to prevent confusion

 *          created by clobbered Tag Access register during a nested

 *          DTLB miss.

 * @param istate    Interrupted state saved on the stack.

 */

void fast_data_access_mmu_miss(tlb_tag_access_reg_t tag, istate_t *istate)

{

    uintptr_t page_8k;

    uintptr_t page_16k;

    size_t index;

    pte_t *t;

    page_8k = (uint64_t) tag.vpn << MMU_PAGE_WIDTH;

    page_16k = ALIGN_DOWN(page_8k, PAGE_SIZE);

    index = tag.vpn % MMU_PAGES_PER_PAGE;

    if (tag.context == ASID_KERNEL) {

        if (!tag.vpn) {

            /* NULL access in kernel */

            do_fast_data_access_mmu_miss_fault(istate, tag,

                __func__);

        } else if (page_8k >= end_of_identity) {

            /*

             * The kernel is accessing the I/O space.

             * We still do identity mapping for I/O,

             * but without caching.

             */

            dtlb_insert_mapping(page_8k, KA2PA(page_8k),

                PAGESIZE_8K, false, false);

            return;

        }

        do_fast_data_access_mmu_miss_fault(istate, tag, "Unexpected "

            "kernel page fault.");

    }

    page_table_lock(AS, true);

    t = page_mapping_find(AS, page_16k);

    if (t) {

        /*

         * The mapping was found in the software page hash table.

         * Insert it into DTLB.

         */

        t->a = true;

        dtlb_pte_copy(t, index, true);

#ifdef CONFIG_TSB

        dtsb_pte_copy(t, index, true);

#endif

        page_table_unlock(AS, true);

    } else {

        /*

         * Forward the page fault to the address space page fault

         * handler.

         */    

        page_table_unlock(AS, true);

        if (as_page_fault(page_16k, PF_ACCESS_READ, istate) ==

            AS_PF_FAULT) {

            do_fast_data_access_mmu_miss_fault(istate, tag,

                __func__);

        }

    }

}

/** DTLB protection fault handler.

 *

 * @param tag       Content of the TLB Tag Access register as it existed

 *          when the trap happened. This is to prevent confusion

 *          created by clobbered Tag Access register during a nested

 *          DTLB miss.

 * @param istate    Interrupted state saved on the stack.

 */

void fast_data_access_protection(tlb_tag_access_reg_t tag, istate_t *istate)

{

    uintptr_t page_16k;

    size_t index;

    pte_t *t;

    page_16k = ALIGN_DOWN((uint64_t) tag.vpn << MMU_PAGE_WIDTH, PAGE_SIZE);

    index = tag.vpn % MMU_PAGES_PER_PAGE;   /* 16K-page emulation */

    page_table_lock(AS, true);

    t = page_mapping_find(AS, page_16k);

    if (t && PTE_WRITABLE(t)) {

        /*

         * The mapping was found in the software page hash table and is

         * writable. Demap the old mapping and insert an updated mapping

         * into DTLB.

         */

        t->a = true;

        t->d = true;

        dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_SECONDARY,

            page_16k + index * MMU_PAGE_SIZE);

        dtlb_pte_copy(t, index, false);

#ifdef CONFIG_TSB

        dtsb_pte_copy(t, index, false);

#endif

        page_table_unlock(AS, true);

    } else {

        /*

         * Forward the page fault to the address space page fault

         * handler.

         */    

        page_table_unlock(AS, true);

        if (as_page_fault(page_16k, PF_ACCESS_WRITE, istate) ==

            AS_PF_FAULT) {

            do_fast_data_access_protection_fault(istate, tag,

                __func__);

        }

    }

}

/** Print TLB entry (for debugging purposes).

 *

 * The diag field has been left out in order to make this function more generic

 * (there is no diag field in US3 architeture).

 *

 * @param i     TLB entry number

 * @param t     TLB entry tag

 * @param d     TLB entry data

 */

static void print_tlb_entry(int i, tlb_tag_read_reg_t t, tlb_data_t d)

{

    printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, "

        "ie=%d, soft2=%#x, pfn=%#x, soft=%#x, l=%d, "

        "cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n", i, t.vpn,

        t.context, d.v, d.size, d.nfo, d.ie, d.soft2,

        d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);

}

#if defined (US)

/** Print contents of both TLBs. */

void tlb_print(void)

{

    int i;

    tlb_data_t d;

    tlb_tag_read_reg_t t;

    printf("I-TLB contents:\n");

    for (i = 0; i < ITLB_ENTRY_COUNT; i++) {

        d.value = itlb_data_access_read(i);

        t.value = itlb_tag_read_read(i);

        print_tlb_entry(i, t, d);

    }

    printf("D-TLB contents:\n");

    for (i = 0; i < DTLB_ENTRY_COUNT; i++) {

        d.value = dtlb_data_access_read(i);

        t.value = dtlb_tag_read_read(i);

        print_tlb_entry(i, t, d);

    }

}

#elif defined (US3)

/** Print contents of all TLBs. */

void tlb_print(void)

{

    int i;

    tlb_data_t d;

    tlb_tag_read_reg_t t;

    printf("TLB_ISMALL contents:\n");

    for (i = 0; i < tlb_ismall_size(); i++) {

        d.value = dtlb_data_access_read(TLB_ISMALL, i);

        t.value = dtlb_tag_read_read(TLB_ISMALL, i);

        print_tlb_entry(i, t, d);

    }

    printf("TLB_IBIG contents:\n");

    for (i = 0; i < tlb_ibig_size(); i++) {

        d.value = dtlb_data_access_read(TLB_IBIG, i);

        t.value = dtlb_tag_read_read(TLB_IBIG, i);

        print_tlb_entry(i, t, d);

    }

    printf("TLB_DSMALL contents:\n");

    for (i = 0; i < tlb_dsmall_size(); i++) {

        d.value = dtlb_data_access_read(TLB_DSMALL, i);

        t.value = dtlb_tag_read_read(TLB_DSMALL, i);

        print_tlb_entry(i, t, d);

    }

    printf("TLB_DBIG_1 contents:\n");

    for (i = 0; i < tlb_dbig_size(); i++) {

        d.value = dtlb_data_access_read(TLB_DBIG_0, i);

        t.value = dtlb_tag_read_read(TLB_DBIG_0, i);

        print_tlb_entry(i, t, d);

    }

    printf("TLB_DBIG_2 contents:\n");

    for (i = 0; i < tlb_dbig_size(); i++) {

        d.value = dtlb_data_access_read(TLB_DBIG_1, i);

        t.value = dtlb_tag_read_read(TLB_DBIG_1, i);

        print_tlb_entry(i, t, d);

    }

}

#endif

void do_fast_instruction_access_mmu_miss_fault(istate_t *istate,

    const char *str)

{

    fault_if_from_uspace(istate, "%s.", str);

    dump_istate(istate);

    panic("%s.", str);

}

void do_fast_data_access_mmu_miss_fault(istate_t *istate,

    tlb_tag_access_reg_t tag, const char *str)

{

    uintptr_t va;

    va = tag.vpn << MMU_PAGE_WIDTH;

    if (tag.context) {

        fault_if_from_uspace(istate, "%s, Page=%p (ASID=%d).", str, va,

            tag.context);

    }

    dump_istate(istate);

    printf("Faulting page: %p, ASID=%d.\n", va, tag.context);

    panic("%s.", str);

}

void do_fast_data_access_protection_fault(istate_t *istate,

    tlb_tag_access_reg_t tag, const char *str)

{

    uintptr_t va;

    va = tag.vpn << MMU_PAGE_WIDTH;

    if (tag.context) {

        fault_if_from_uspace(istate, "%s, Page=%p (ASID=%d).", str, va,

            tag.context);

    }

    printf("Faulting page: %p, ASID=%d\n", va, tag.context);

    dump_istate(istate);

    panic("%s.", str);

}

void dump_sfsr_and_sfar(void)

{

    tlb_sfsr_reg_t sfsr;

    uintptr_t sfar;

    sfsr.value = dtlb_sfsr_read();

    sfar = dtlb_sfar_read();

#if defined (US)

    printf("DTLB SFSR: asi=%#x, ft=%#x, e=%d, ct=%d, pr=%d, w=%d, ow=%d, "

        "fv=%d\n", sfsr.asi, sfsr.ft, sfsr.e, sfsr.ct, sfsr.pr, sfsr.w,

        sfsr.ow, sfsr.fv);

#elif defined (US3)

    printf("DTLB SFSR: nf=%d, asi=%#x, tm=%d, ft=%#x, e=%d, ct=%d, pr=%d, "

        "w=%d, ow=%d, fv=%d\n", sfsr.nf, sfsr.asi, sfsr.tm, sfsr.ft,

        sfsr.e, sfsr.ct, sfsr.pr, sfsr.w, sfsr.ow, sfsr.fv);

#endif

    printf("DTLB SFAR: address=%p\n", sfar);

    dtlb_sfsr_write(0);

}

#if defined (US)

/** Invalidate all unlocked ITLB and DTLB entries. */

void tlb_invalidate_all(void)

{

    int i;

    /*

     * Walk all ITLB and DTLB entries and remove all unlocked mappings.

     *

     * The kernel doesn't use global mappings so any locked global mappings

     * found must have been created by someone else. Their only purpose now

     * is to collide with proper mappings. Invalidate immediately. It should

     * be safe to invalidate them as late as now.

     */

    tlb_data_t d;

    tlb_tag_read_reg_t t;

    for (i = 0; i < ITLB_ENTRY_COUNT; i++) {

        d.value = itlb_data_access_read(i);

        if (!d.l || d.g) {

            t.value = itlb_tag_read_read(i);

            d.v = false;

            itlb_tag_access_write(t.value);

            itlb_data_access_write(i, d.value);

        }

    }

    for (i = 0; i < DTLB_ENTRY_COUNT; i++) {

        d.value = dtlb_data_access_read(i);

        if (!d.l || d.g) {

            t.value = dtlb_tag_read_read(i);

            d.v = false;

            dtlb_tag_access_write(t.value);

            dtlb_data_access_write(i, d.value);

        }

    }

}

#elif defined (US3)

/** Invalidate all unlocked ITLB and DTLB entries. */

void tlb_invalidate_all(void)

{

    itlb_demap(TLB_DEMAP_ALL, 0, 0);

    dtlb_demap(TLB_DEMAP_ALL, 0, 0);

}

#endif

/** Invalidate all ITLB and DTLB entries that belong to specified ASID

 * (Context).

 *

 * @param asid Address Space ID.

 */

void tlb_invalidate_asid(asid_t asid)

{

    tlb_context_reg_t pc_save, ctx;

    /* switch to nucleus because we are mapped by the primary context */

    nucleus_enter();

    ctx.v = pc_save.v = mmu_primary_context_read();

    ctx.context = asid;

    mmu_primary_context_write(ctx.v);

    itlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_PRIMARY, 0);

    dtlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_PRIMARY, 0);

    mmu_primary_context_write(pc_save.v);

    nucleus_leave();

}

/** Invalidate all ITLB and DTLB entries for specified page range in specified

 * address space.

 *

 * @param asid      Address Space ID.

 * @param page      First page which to sweep out from ITLB and DTLB.

 * @param cnt       Number of ITLB and DTLB entries to invalidate.

 */

void tlb_invalidate_pages(asid_t asid, uintptr_t page, size_t cnt)

{

    unsigned int i;

    tlb_context_reg_t pc_save, ctx;

    /* switch to nucleus because we are mapped by the primary context */

    nucleus_enter();

    ctx.v = pc_save.v = mmu_primary_context_read();

    ctx.context = asid;

    mmu_primary_context_write(ctx.v);

    for (i = 0; i < cnt * MMU_PAGES_PER_PAGE; i++) {

        itlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_PRIMARY,

            page + i * MMU_PAGE_SIZE);

        dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_PRIMARY,

            page + i * MMU_PAGE_SIZE);

    }

    mmu_primary_context_write(pc_save.v);

    nucleus_leave();

}

/** @}

 */