    /* SPDX-License-Identifier: MIT */
    /******************************************************************************
     * tmem.h
     *
     * Guest OS interface to Xen Transcendent Memory.
     *
     * Copyright (c) 2004, K A Fraser
     */

    #ifndef __XEN_PUBLIC_TMEM_H__
    #define __XEN_PUBLIC_TMEM_H__

    #include "xen.h"

    #if __XEN_INTERFACE_VERSION__ < 0x00041300

    /* version of ABI */
    #define TMEM_SPEC_VERSION          1

    #define TMEM_NEW_POOL              1
    #define TMEM_DESTROY_POOL          2
    #define TMEM_PUT_PAGE              4
    #define TMEM_GET_PAGE              5
    #define TMEM_FLUSH_PAGE            6
    #define TMEM_FLUSH_OBJECT          7
    #if __XEN_INTERFACE_VERSION__ < 0x00040400
    #define TMEM_NEW_PAGE              3
    #define TMEM_READ                  8
    #define TMEM_WRITE                 9
    #define TMEM_XCHG                 10
    #endif

    /* Privileged commands now called via XEN_SYSCTL_tmem_op. */
    #define TMEM_AUTH                 101 /* as XEN_SYSCTL_TMEM_OP_SET_AUTH. */
    #define TMEM_RESTORE_NEW          102 /* as XEN_SYSCTL_TMEM_OP_SET_POOL. */

    /* Bits for HYPERVISOR_tmem_op(TMEM_NEW_POOL) */
    #define TMEM_POOL_PERSIST          1
    #define TMEM_POOL_SHARED           2
    #define TMEM_POOL_PRECOMPRESSED    4
    #define TMEM_POOL_PAGESIZE_SHIFT   4
    #define TMEM_POOL_PAGESIZE_MASK  0xf
    #define TMEM_POOL_VERSION_SHIFT   24
    #define TMEM_POOL_VERSION_MASK  0xff
    #define TMEM_POOL_RESERVED_BITS  0x00ffff00

    /* Bits for client flags (save/restore) */
    #define TMEM_CLIENT_COMPRESS       1
    #define TMEM_CLIENT_FROZEN         2

    /* Special errno values */
    #define EFROZEN                 1000
    #define EEMPTY                  1001

    struct xen_tmem_oid {
        uint64_t oid[3];
    };
    typedef struct xen_tmem_oid xen_tmem_oid_t;
    DEFINE_XEN_GUEST_HANDLE(xen_tmem_oid_t);

    #ifndef __ASSEMBLY__
    #if __XEN_INTERFACE_VERSION__ < 0x00040400
    typedef xen_pfn_t tmem_cli_mfn_t;
    #endif
    typedef XEN_GUEST_HANDLE(char) tmem_cli_va_t;
    struct tmem_op {
        uint32_t cmd;
        int32_t pool_id;
        union {
            struct {
                uint64_t uuid[2];
                uint32_t flags;
                uint32_t arg1;
            } creat; /* for cmd == TMEM_NEW_POOL. */
            struct {
    #if __XEN_INTERFACE_VERSION__ < 0x00040600
                uint64_t oid[3];
    #else
                xen_tmem_oid_t oid;
    #endif
                uint32_t index;
                uint32_t tmem_offset;
                uint32_t pfn_offset;
                uint32_t len;
                xen_pfn_t cmfn; /* client machine page frame */
            } gen; /* for all other cmd ("generic") */
        } u;
    };
    typedef struct tmem_op tmem_op_t;
    DEFINE_XEN_GUEST_HANDLE(tmem_op_t);
    #endif

    #endif  /* __XEN_INTERFACE_VERSION__ < 0x00041300 */

    #endif /* __XEN_PUBLIC_TMEM_H__ */

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