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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 *t, index_t index, bool ro);

static void itlb_pte_copy(pte_t *t, index_t index);

static void do_fast_instruction_access_mmu_miss_fault(istate_t *istate,

    const char *str);

static void do_fast_data_access_mmu_miss_fault(istate_t *istate,

    tlb_tag_access_reg_t tag, const char *str);

static void do_fast_data_access_protection_fault(istate_t *istate,

    tlb_tag_access_reg_t tag, const char *str);

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.value = 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, index_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, index_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 va = ALIGN_DOWN(istate->tpc, PAGE_SIZE);

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

    pte_t *t;

    page_table_lock(AS, true);

    t = page_mapping_find(AS, va);

    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(va, PF_ACCESS_EXEC, istate) == AS_PF_FAULT) {

            do_fast_instruction_access_mmu_miss_fault(istate,

                __FUNCTION__);

        }

    }

}

/** 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 va;

    index_t index;

    pte_t *t;

    va = ALIGN_DOWN((uint64_t) tag.vpn << MMU_PAGE_WIDTH, 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,

                __FUNCTION__);

        }

        do_fast_data_access_mmu_miss_fault(istate, tag, "Unexpected "

            "kernel page fault.");

    }

    page_table_lock(AS, true);

    t = page_mapping_find(AS, va);

    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(va, PF_ACCESS_READ, istate) == AS_PF_FAULT) {

            do_fast_data_access_mmu_miss_fault(istate, tag,

                __FUNCTION__);

        }

    }

}

/** 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 va;

    index_t index;

    pte_t *t;

    va = 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, va);

    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,

            va + 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(va, PF_ACCESS_WRITE, istate) == AS_PF_FAULT) {

            do_fast_data_access_protection_fault(istate, tag,

                __FUNCTION__);

        }

    }

}

/** 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);

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

            "ie=%d, soft2=%#x, diag=%#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.diag,

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

    }

    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);

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

            "ie=%d, soft2=%#x, diag=%#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.diag,

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

    }

}

void do_fast_instruction_access_mmu_miss_fault(istate_t *istate,

    const char *str)

{

    fault_if_from_uspace(istate, "%s\n", str);

    dump_istate(istate);

    panic("%s\n", 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)\n", str, va,

            tag.context);

    }

    dump_istate(istate);

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

    panic("%s\n", 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)\n", str, va,

            tag.context);

    }

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

    dump_istate(istate);

    panic("%s\n", str);

}

void dump_sfsr_and_sfar(void)

{

    tlb_sfsr_reg_t sfsr;

    uintptr_t sfar;

    sfsr.value = dtlb_sfsr_read();

    sfar = dtlb_sfar_read();

    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);

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

    dtlb_sfsr_write(0);

}

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

void tlb_invalidate_all(void)

{

    int i;

    tlb_data_t d;

    tlb_tag_read_reg_t t;

    /*

     * 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.

     */

    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);

        }

    }

}

/** 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, count_t cnt)

{

    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();

}

/** @}

 */