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/*

 * XEN platform pci device, formerly known as the event channel device

 *

 * Copyright (c) 2003-2004 Intel Corp.

 * Copyright (c) 2006 XenSource

 *

 * 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 <assert.h>

#include "hw.h"

#include "pc.h"

#include "pci.h"

#include "irq.h"

#include "xen_common.h"

#include "net.h"

#include "xen_backend.h"

#include "rwhandler.h"

#include "trace.h"

#include <xenguest.h>

//#define DEBUG_PLATFORM

#ifdef DEBUG_PLATFORM

#define DPRINTF(fmt, ...) do { \

    fprintf(stderr, "xen_platform: " fmt, ## __VA_ARGS__); \

} while (0)

#else

#define DPRINTF(fmt, ...) do { } while (0)

#endif

#define PFFLAG_ROM_LOCK 1 /* Sets whether ROM memory area is RW or RO */

typedef struct PCIXenPlatformState {

    PCIDevice  pci_dev;

    uint8_t flags; /* used only for version_id == 2 */

    int drivers_blacklisted;

    uint16_t driver_product_version;

    /* Log from guest drivers */

    char log_buffer[4096];

    int log_buffer_off;

} PCIXenPlatformState;

#define XEN_PLATFORM_IOPORT 0x10

/* Send bytes to syslog */

static void log_writeb(PCIXenPlatformState *s, char val)

{

    if (val == '\n' || s->log_buffer_off == sizeof(s->log_buffer) - 1) {

        /* Flush buffer */

        s->log_buffer[s->log_buffer_off] = 0;

        trace_xen_platform_log(s->log_buffer);

        s->log_buffer_off = 0;

    } else {

        s->log_buffer[s->log_buffer_off++] = val;

    }

}

/* Xen Platform, Fixed IOPort */

static void platform_fixed_ioport_writew(void *opaque, uint32_t addr, uint32_t val)

{

    PCIXenPlatformState *s = opaque;

    switch (addr - XEN_PLATFORM_IOPORT) {

    case 0:

        /* TODO: */

        /* Unplug devices.  Value is a bitmask of which devices to

           unplug, with bit 0 the IDE devices, bit 1 the network

           devices, and bit 2 the non-primary-master IDE devices. */

        break;

    case 2:

        switch (val) {

        case 1:

            DPRINTF("Citrix Windows PV drivers loaded in guest\n");

            break;

        case 0:

            DPRINTF("Guest claimed to be running PV product 0?\n");

            break;

        default:

            DPRINTF("Unknown PV product %d loaded in guest\n", val);

            break;

        }

        s->driver_product_version = val;

        break;

    }

}

static void platform_fixed_ioport_writel(void *opaque, uint32_t addr,

                                         uint32_t val)

{

    switch (addr - XEN_PLATFORM_IOPORT) {

    case 0:

        /* PV driver version */

        break;

    }

}

static void platform_fixed_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)

{

    PCIXenPlatformState *s = opaque;

    switch (addr - XEN_PLATFORM_IOPORT) {

    case 0: /* Platform flags */ {

        hvmmem_type_t mem_type = (val & PFFLAG_ROM_LOCK) ?

            HVMMEM_ram_ro : HVMMEM_ram_rw;

        if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type, 0xc0, 0x40)) {

            DPRINTF("unable to change ro/rw state of ROM memory area!\n");

        } else {

            s->flags = val & PFFLAG_ROM_LOCK;

            DPRINTF("changed ro/rw state of ROM memory area. now is %s state.\n",

                    (mem_type == HVMMEM_ram_ro ? "ro":"rw"));

        }

        break;

    }

    case 2:

        log_writeb(s, val);

        break;

    }

}

static uint32_t platform_fixed_ioport_readw(void *opaque, uint32_t addr)

{

    PCIXenPlatformState *s = opaque;

    switch (addr - XEN_PLATFORM_IOPORT) {

    case 0:

        if (s->drivers_blacklisted) {

            /* The drivers will recognise this magic number and refuse

             * to do anything. */

            return 0xd249;

        } else {

            /* Magic value so that you can identify the interface. */

            return 0x49d2;

        }

    default:

        return 0xffff;

    }

}

static uint32_t platform_fixed_ioport_readb(void *opaque, uint32_t addr)

{

    PCIXenPlatformState *s = opaque;

    switch (addr - XEN_PLATFORM_IOPORT) {

    case 0:

        /* Platform flags */

        return s->flags;

    case 2:

        /* Version number */

        return 1;

    default:

        return 0xff;

    }

}

static void platform_fixed_ioport_reset(void *opaque)

{

    PCIXenPlatformState *s = opaque;

    platform_fixed_ioport_writeb(s, XEN_PLATFORM_IOPORT, 0);

}

static void platform_fixed_ioport_init(PCIXenPlatformState* s)

{

    register_ioport_write(XEN_PLATFORM_IOPORT, 16, 4, platform_fixed_ioport_writel, s);

    register_ioport_write(XEN_PLATFORM_IOPORT, 16, 2, platform_fixed_ioport_writew, s);

    register_ioport_write(XEN_PLATFORM_IOPORT, 16, 1, platform_fixed_ioport_writeb, s);

    register_ioport_read(XEN_PLATFORM_IOPORT, 16, 2, platform_fixed_ioport_readw, s);

    register_ioport_read(XEN_PLATFORM_IOPORT, 16, 1, platform_fixed_ioport_readb, s);

}

/* Xen Platform PCI Device */

static uint32_t xen_platform_ioport_readb(void *opaque, uint32_t addr)

{

    addr &= 0xff;

    if (addr == 0) {

        return platform_fixed_ioport_readb(opaque, XEN_PLATFORM_IOPORT);

    } else {

        return ~0u;

    }

}

static void xen_platform_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)

{

    PCIXenPlatformState *s = opaque;

    addr &= 0xff;

    val  &= 0xff;

    switch (addr) {

    case 0: /* Platform flags */

        platform_fixed_ioport_writeb(opaque, XEN_PLATFORM_IOPORT, val);

        break;

    case 8:

        log_writeb(s, val);

        break;

    default:

        break;

    }

}

static void platform_ioport_map(PCIDevice *pci_dev, int region_num, pcibus_t addr, pcibus_t size, int type)

{

    PCIXenPlatformState *d = DO_UPCAST(PCIXenPlatformState, pci_dev, pci_dev);

    register_ioport_write(addr, size, 1, xen_platform_ioport_writeb, d);

    register_ioport_read(addr, size, 1, xen_platform_ioport_readb, d);

}

static uint32_t platform_mmio_read(ReadWriteHandler *handler, pcibus_t addr, int len)

{

    DPRINTF("Warning: attempted read from physical address "

            "0x" TARGET_FMT_plx " in xen platform mmio space\n", addr);

    return 0;

}

static void platform_mmio_write(ReadWriteHandler *handler, pcibus_t addr,

                                uint32_t val, int len)

{

    DPRINTF("Warning: attempted write of 0x%x to physical "

            "address 0x" TARGET_FMT_plx " in xen platform mmio space\n",

            val, addr);

}

static ReadWriteHandler platform_mmio_handler = {

    .read = &platform_mmio_read,

    .write = &platform_mmio_write,

};

static void platform_mmio_map(PCIDevice *d, int region_num,

                              pcibus_t addr, pcibus_t size, int type)

{

    int mmio_io_addr;

    mmio_io_addr = cpu_register_io_memory_simple(&platform_mmio_handler,

                                                 DEVICE_NATIVE_ENDIAN);

    cpu_register_physical_memory(addr, size, mmio_io_addr);

}

static int xen_platform_post_load(void *opaque, int version_id)

{

    PCIXenPlatformState *s = opaque;

    platform_fixed_ioport_writeb(s, XEN_PLATFORM_IOPORT, s->flags);

    return 0;

}

static const VMStateDescription vmstate_xen_platform = {

    .name = "platform",

    .version_id = 4,

    .minimum_version_id = 4,

    .minimum_version_id_old = 4,

    .post_load = xen_platform_post_load,

    .fields = (VMStateField []) {

        VMSTATE_PCI_DEVICE(pci_dev, PCIXenPlatformState),

        VMSTATE_UINT8(flags, PCIXenPlatformState),

        VMSTATE_END_OF_LIST()

    }

};

static int xen_platform_initfn(PCIDevice *dev)

{

    PCIXenPlatformState *d = DO_UPCAST(PCIXenPlatformState, pci_dev, dev);

    uint8_t *pci_conf;

    pci_conf = d->pci_dev.config;

    pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_IO | PCI_COMMAND_MEMORY);

    pci_config_set_prog_interface(pci_conf, 0);

    pci_conf[PCI_INTERRUPT_PIN] = 1;

    pci_register_bar(&d->pci_dev, 0, 0x100,

            PCI_BASE_ADDRESS_SPACE_IO, platform_ioport_map);

    /* reserve 16MB mmio address for share memory*/

    pci_register_bar(&d->pci_dev, 1, 0x1000000,

            PCI_BASE_ADDRESS_MEM_PREFETCH, platform_mmio_map);

    platform_fixed_ioport_init(d);

    return 0;

}

static void platform_reset(DeviceState *dev)

{

    PCIXenPlatformState *s = DO_UPCAST(PCIXenPlatformState, pci_dev.qdev, dev);

    platform_fixed_ioport_reset(s);

}

static PCIDeviceInfo xen_platform_info = {

    .init = xen_platform_initfn,

    .qdev.name = "xen-platform",

    .qdev.desc = "XEN platform pci device",

    .qdev.size = sizeof(PCIXenPlatformState),

    .qdev.vmsd = &vmstate_xen_platform,

    .qdev.reset = platform_reset,

    .vendor_id    =  PCI_VENDOR_ID_XEN,

    .device_id    = PCI_DEVICE_ID_XEN_PLATFORM,

    .class_id     = PCI_CLASS_OTHERS << 8 | 0x80,

    .subsystem_vendor_id = PCI_VENDOR_ID_XEN,

    .subsystem_id = PCI_DEVICE_ID_XEN_PLATFORM,

    .revision = 1,

};

static void xen_platform_register(void)

{

    pci_qdev_register(&xen_platform_info);

}

device_init(xen_platform_register);