Archipelago » qemu

/*

 * QEMU IDE Emulation: PCI Bus support.

 *

 * Copyright (c) 2003 Fabrice Bellard

 * Copyright (c) 2006 Openedhand Ltd.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

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

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include <hw/hw.h>

#include <hw/pc.h>

#include <hw/pci.h>

#include <hw/isa.h>

#include "block.h"

#include "block_int.h"

#include "sysemu.h"

#include "dma.h"

#include <hw/ide/pci.h>

void bmdma_cmd_writeb(void *opaque, uint32_t addr, uint32_t val)

{

    BMDMAState *bm = opaque;

#ifdef DEBUG_IDE

    printf("%s: 0x%08x\n", __func__, val);

#endif

    if (!(val & BM_CMD_START)) {

        /*

         * We can't cancel Scatter Gather DMA in the middle of the

         * operation or a partial (not full) DMA transfer would reach

         * the storage so we wait for completion instead (we beahve

         * like if the DMA was completed by the time the guest trying

         * to cancel dma with bmdma_cmd_writeb with BM_CMD_START not

         * set).

         *

         * In the future we'll be able to safely cancel the I/O if the

         * whole DMA operation will be submitted to disk with a single

         * aio operation with preadv/pwritev.

         */

        if (bm->aiocb) {

            qemu_aio_flush();

#ifdef DEBUG_IDE

            if (bm->aiocb)

                printf("ide_dma_cancel: aiocb still pending");

            if (bm->status & BM_STATUS_DMAING)

                printf("ide_dma_cancel: BM_STATUS_DMAING still pending");

#endif

        }

        bm->cmd = val & 0x09;

    } else {

        if (!(bm->status & BM_STATUS_DMAING)) {

            bm->status |= BM_STATUS_DMAING;

            /* start dma transfer if possible */

            if (bm->dma_cb)

                bm->dma_cb(bm, 0);

        }

        bm->cmd = val & 0x09;

    }

}

uint32_t bmdma_addr_readb(void *opaque, uint32_t addr)

{

    BMDMAState *bm = opaque;

    uint32_t val;

    val = (bm->addr >> ((addr & 3) * 8)) & 0xff;

#ifdef DEBUG_IDE

    printf("%s: 0x%08x\n", __func__, val);

#endif

    return val;

}

void bmdma_addr_writeb(void *opaque, uint32_t addr, uint32_t val)

{

    BMDMAState *bm = opaque;

    int shift = (addr & 3) * 8;

#ifdef DEBUG_IDE

    printf("%s: 0x%08x\n", __func__, val);

#endif

    bm->addr &= ~(0xFF << shift);

    bm->addr |= ((val & 0xFF) << shift) & ~3;

    bm->cur_addr = bm->addr;

}

uint32_t bmdma_addr_readw(void *opaque, uint32_t addr)

{

    BMDMAState *bm = opaque;

    uint32_t val;

    val = (bm->addr >> ((addr & 3) * 8)) & 0xffff;

#ifdef DEBUG_IDE

    printf("%s: 0x%08x\n", __func__, val);

#endif

    return val;

}

void bmdma_addr_writew(void *opaque, uint32_t addr, uint32_t val)

{

    BMDMAState *bm = opaque;

    int shift = (addr & 3) * 8;

#ifdef DEBUG_IDE

    printf("%s: 0x%08x\n", __func__, val);

#endif

    bm->addr &= ~(0xFFFF << shift);

    bm->addr |= ((val & 0xFFFF) << shift) & ~3;

    bm->cur_addr = bm->addr;

}

uint32_t bmdma_addr_readl(void *opaque, uint32_t addr)

{

    BMDMAState *bm = opaque;

    uint32_t val;

    val = bm->addr;

#ifdef DEBUG_IDE

    printf("%s: 0x%08x\n", __func__, val);

#endif

    return val;

}

void bmdma_addr_writel(void *opaque, uint32_t addr, uint32_t val)

{

    BMDMAState *bm = opaque;

#ifdef DEBUG_IDE

    printf("%s: 0x%08x\n", __func__, val);

#endif

    bm->addr = val & ~3;

    bm->cur_addr = bm->addr;

}

static bool ide_bmdma_current_needed(void *opaque)

{

    BMDMAState *bm = opaque;

    return (bm->cur_prd_len != 0);

}

static const VMStateDescription vmstate_bmdma_current = {

    .name = "ide bmdma_current",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields      = (VMStateField []) {

        VMSTATE_UINT32(cur_addr, BMDMAState),

        VMSTATE_UINT32(cur_prd_last, BMDMAState),

        VMSTATE_UINT32(cur_prd_addr, BMDMAState),

        VMSTATE_UINT32(cur_prd_len, BMDMAState),

        VMSTATE_END_OF_LIST()

    }

};

static const VMStateDescription vmstate_bmdma = {

    .name = "ide bmdma",

    .version_id = 3,

    .minimum_version_id = 0,

    .minimum_version_id_old = 0,

    .fields      = (VMStateField []) {

        VMSTATE_UINT8(cmd, BMDMAState),

        VMSTATE_UINT8(status, BMDMAState),

        VMSTATE_UINT32(addr, BMDMAState),

        VMSTATE_INT64(sector_num, BMDMAState),

        VMSTATE_UINT32(nsector, BMDMAState),

        VMSTATE_UINT8(unit, BMDMAState),

        VMSTATE_END_OF_LIST()

    },

    .subsections = (VMStateSubsection []) {

        {

            .vmsd = &vmstate_bmdma_current,

            .needed = ide_bmdma_current_needed,

        }, {

            /* empty */

        }

    }

};

static int ide_pci_post_load(void *opaque, int version_id)

{

    PCIIDEState *d = opaque;

    int i;

    for(i = 0; i < 2; i++) {

        /* current versions always store 0/1, but older version

           stored bigger values. We only need last bit */

        d->bmdma[i].unit &= 1;

    }

    return 0;

}

const VMStateDescription vmstate_ide_pci = {

    .name = "ide",

    .version_id = 3,

    .minimum_version_id = 0,

    .minimum_version_id_old = 0,

    .post_load = ide_pci_post_load,

    .fields      = (VMStateField []) {

        VMSTATE_PCI_DEVICE(dev, PCIIDEState),

        VMSTATE_STRUCT_ARRAY(bmdma, PCIIDEState, 2, 0,

                             vmstate_bmdma, BMDMAState),

        VMSTATE_IDE_BUS_ARRAY(bus, PCIIDEState, 2),

        VMSTATE_IDE_DRIVES(bus[0].ifs, PCIIDEState),

        VMSTATE_IDE_DRIVES(bus[1].ifs, PCIIDEState),

        VMSTATE_END_OF_LIST()

    }

};

void pci_ide_create_devs(PCIDevice *dev, DriveInfo **hd_table)

{

    PCIIDEState *d = DO_UPCAST(PCIIDEState, dev, dev);

    static const int bus[4]  = { 0, 0, 1, 1 };

    static const int unit[4] = { 0, 1, 0, 1 };

    int i;

    for (i = 0; i < 4; i++) {

        if (hd_table[i] == NULL)

            continue;

        ide_create_drive(d->bus+bus[i], unit[i], hd_table[i]);

    }

}