/* SPDX-License-Identifier: MIT */
/*
 * ioreq.h: I/O request definitions for device models
 * Copyright (c) 2004, Intel Corporation.
 */

#ifndef _IOREQ_H_
#define _IOREQ_H_

#define IOREQ_READ      1
#define IOREQ_WRITE     0

#define STATE_IOREQ_NONE        0
#define STATE_IOREQ_READY       1
#define STATE_IOREQ_INPROCESS   2
#define STATE_IORESP_READY      3

#define IOREQ_TYPE_PIO          0 /* pio */
#define IOREQ_TYPE_COPY         1 /* mmio ops */
#define IOREQ_TYPE_PCI_CONFIG   2
#define IOREQ_TYPE_TIMEOFFSET   7
#define IOREQ_TYPE_INVALIDATE   8 /* mapcache */

/*
 * VMExit dispatcher should cooperate with instruction decoder to
 * prepare this structure and notify service OS and DM by sending
 * virq.
 *
 * For I/O type IOREQ_TYPE_PCI_CONFIG, the physical address is formatted
 * as follows:
 *
 * 63....48|47..40|39..35|34..32|31........0
 * SEGMENT |BUS   |DEV   |FN    |OFFSET
 */
struct ioreq {
    uint64_t addr;          /* physical address */
    uint64_t data;          /* data (or paddr of data) */
    uint32_t count;         /* for rep prefixes */
    uint32_t size;          /* size in bytes */
    uint32_t vp_eport;      /* evtchn for notifications to/from device model */
    uint16_t _pad0;
    uint8_t state:4;
    uint8_t data_is_ptr:1;  /* if 1, data above is the guest paddr
                             * of the real data to use. */
    uint8_t dir:1;          /* 1=read, 0=write */
    uint8_t df:1;
    uint8_t _pad1:1;
    uint8_t type;           /* I/O type */
};
typedef struct ioreq ioreq_t;

struct shared_iopage {
    struct ioreq vcpu_ioreq[1];
};
typedef struct shared_iopage shared_iopage_t;

struct buf_ioreq {
    uint8_t  type;   /* I/O type                    */
    uint8_t  pad:1;
    uint8_t  dir:1;  /* 1=read, 0=write             */
    uint8_t  size:2; /* 0=>1, 1=>2, 2=>4, 3=>8. If 8, use two buf_ioreqs */
    uint32_t addr:20;/* physical address            */
    uint32_t data;   /* data                        */
};
typedef struct buf_ioreq buf_ioreq_t;

#define IOREQ_BUFFER_SLOT_NUM     511 /* 8 bytes each, plus 2 4-byte indexes */
struct buffered_iopage {
#ifdef __XEN__
    union bufioreq_pointers {
        struct {
#endif
            uint32_t read_pointer;
            uint32_t write_pointer;
#ifdef __XEN__
        };
        uint64_t full;
    } ptrs;
#endif
    buf_ioreq_t buf_ioreq[IOREQ_BUFFER_SLOT_NUM];
}; /* NB. Size of this structure must be no greater than one page. */
typedef struct buffered_iopage buffered_iopage_t;

/*
 * ACPI Control/Event register locations. Location is controlled by a
 * version number in HVM_PARAM_ACPI_IOPORTS_LOCATION.
 */

/*
 * Version 0 (default): Traditional (obsolete) Xen locations.
 *
 * These are now only used for compatibility with VMs migrated
 * from older Xen versions.
 */
#define ACPI_PM1A_EVT_BLK_ADDRESS_V0 0x1f40
#define ACPI_PM1A_CNT_BLK_ADDRESS_V0 (ACPI_PM1A_EVT_BLK_ADDRESS_V0 + 0x04)
#define ACPI_PM_TMR_BLK_ADDRESS_V0   (ACPI_PM1A_EVT_BLK_ADDRESS_V0 + 0x08)
#define ACPI_GPE0_BLK_ADDRESS_V0     (ACPI_PM_TMR_BLK_ADDRESS_V0 + 0x20)
#define ACPI_GPE0_BLK_LEN_V0         0x08

/* Version 1: Locations preferred by modern Qemu (including Qemu-trad). */
#define ACPI_PM1A_EVT_BLK_ADDRESS_V1 0xb000
#define ACPI_PM1A_CNT_BLK_ADDRESS_V1 (ACPI_PM1A_EVT_BLK_ADDRESS_V1 + 0x04)
#define ACPI_PM_TMR_BLK_ADDRESS_V1   (ACPI_PM1A_EVT_BLK_ADDRESS_V1 + 0x08)
#define ACPI_GPE0_BLK_ADDRESS_V1     0xafe0
#define ACPI_GPE0_BLK_LEN_V1         0x04

/* Compatibility definitions for the default location (version 0). */
#define ACPI_PM1A_EVT_BLK_ADDRESS    ACPI_PM1A_EVT_BLK_ADDRESS_V0
#define ACPI_PM1A_CNT_BLK_ADDRESS    ACPI_PM1A_CNT_BLK_ADDRESS_V0
#define ACPI_PM_TMR_BLK_ADDRESS      ACPI_PM_TMR_BLK_ADDRESS_V0
#define ACPI_GPE0_BLK_ADDRESS        ACPI_GPE0_BLK_ADDRESS_V0
#define ACPI_GPE0_BLK_LEN            ACPI_GPE0_BLK_LEN_V0


#endif /* _IOREQ_H_ */

/*
 * Local variables:
 * mode: C
 * c-file-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */