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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/page.h>

#include <arch/mm/tlb.h>

#include <genarch/mm/page_ht.h>

#include <mm/frame.h>

#include <arch/mm/frame.h>

#include <bitops.h>

#include <debug.h>

#include <align.h>

#include <config.h>

#include <ddi/ddi.h>

/** Physical memory area for devices. */

static parea_t dev_area;

#ifdef CONFIG_SMP

/** Entries locked in DTLB of BSP.

 *

 * Application processors need to have the same locked entries in their DTLBs as

 * the bootstrap processor.

 */

static struct {

    uintptr_t virt_page;

    uintptr_t phys_page;

    int pagesize_code;

} bsp_locked_dtlb_entry[DTLB_MAX_LOCKED_ENTRIES];

/** Number of entries in bsp_locked_dtlb_entry array. */

static count_t bsp_locked_dtlb_entries = 0;

#endif /* CONFIG_SMP */

/** Perform sparc64 specific initialization of paging. */

void page_arch_init(void)

{

    if (config.cpu_active == 1) {

        page_mapping_operations = &ht_mapping_operations;

    } else {

#ifdef CONFIG_SMP

        unsigned int i;

        /*

         * Copy locked DTLB entries from the BSP.

         */    

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

            dtlb_insert_mapping(bsp_locked_dtlb_entry[i].virt_page,

                bsp_locked_dtlb_entry[i].phys_page,

                bsp_locked_dtlb_entry[i].pagesize_code, true,

                false);

        }

#endif  

    }

}

/** Map memory-mapped device into virtual memory.

 *

 * So far, only DTLB is used to map devices into memory. Chances are that there

 * will be only a limited amount of devices that the kernel itself needs to

 * lock in DTLB.

 *

 * @param physaddr Physical address of the page where the device is located.

 *  Must be at least page-aligned.

 * @param size Size of the device's registers. Must not exceed 4M and must

 *  include extra space caused by the alignment.

 *

 * @return Virtual address of the page where the device is mapped.

 */

uintptr_t hw_map(uintptr_t physaddr, size_t size)

{

    unsigned int order;

    unsigned int i;

    ASSERT(config.cpu_active == 1);

    struct {

        int pagesize_code;

        size_t increment;

        count_t count;

    } sizemap[] = {

        { PAGESIZE_8K, 0, 1 },              /* 8K */

        { PAGESIZE_8K, MMU_PAGE_SIZE, 2 },      /* 16K */

        { PAGESIZE_8K, MMU_PAGE_SIZE, 4 },      /* 32K */

        { PAGESIZE_64K, 0, 1},              /* 64K */

        { PAGESIZE_64K, 8 * MMU_PAGE_SIZE, 2 },     /* 128K */

        { PAGESIZE_64K, 8 * MMU_PAGE_SIZE, 4 },     /* 256K */

        { PAGESIZE_512K, 0, 1 },            /* 512K */

        { PAGESIZE_512K, 64 * MMU_PAGE_SIZE, 2 },   /* 1M */

        { PAGESIZE_512K, 64 * MMU_PAGE_SIZE, 4 },   /* 2M */

        { PAGESIZE_4M, 0, 1 },              /* 4M */

        { PAGESIZE_4M, 512 * MMU_PAGE_SIZE, 2 }     /* 8M */

    };

    ASSERT(ALIGN_UP(physaddr, MMU_PAGE_SIZE) == physaddr);

    ASSERT(size <= 8 * 1024 * 1024);

    if (size <= MMU_FRAME_SIZE)

        order = 0;

    else

        order = (fnzb64(size - 1) + 1) - MMU_FRAME_WIDTH;

    /*

     * Use virtual addresses that are beyond the limit of physical memory.

     * Thus, the physical address space will not be wasted by holes created

     * by frame_alloc().

     */

    ASSERT(PA2KA(last_frame));

    uintptr_t virtaddr = ALIGN_UP(PA2KA(last_frame),

        1 << (order + FRAME_WIDTH));

    last_frame = ALIGN_UP(KA2PA(virtaddr) + size,

        1 << (order + FRAME_WIDTH));

    for (i = 0; i < sizemap[order].count; i++) {

        /*

         * First, insert the mapping into DTLB.

         */

        dtlb_insert_mapping(virtaddr + i * sizemap[order].increment,

            physaddr + i * sizemap[order].increment,

            sizemap[order].pagesize_code, true, false);

#ifdef CONFIG_SMP

        /*

         * Second, save the information about the mapping for APs.

         */

        bsp_locked_dtlb_entry[bsp_locked_dtlb_entries].virt_page =

            virtaddr + i * sizemap[order].increment;

        bsp_locked_dtlb_entry[bsp_locked_dtlb_entries].phys_page =

            physaddr + i * sizemap[order].increment;

        bsp_locked_dtlb_entry[bsp_locked_dtlb_entries].pagesize_code =

            sizemap[order].pagesize_code;

        bsp_locked_dtlb_entries++;

#endif

    }

    return virtaddr;

}

void hw_area(void)

{

    dev_area.pbase = end_frame;

    dev_area.frames = SIZE2FRAMES(0x7ffffffffff - end_frame);

    ddi_parea_register(&dev_area);

}

/** @}

 */