FreeBSD/Linux Kernel Cross Reference
sys/xen/interface/xen.h

     /******************************************************************************
      * xen.h
      * 
      * Guest OS interface to Xen.
      * 
      * 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.
     *
     * Copyright (c) 2004, K A Fraser
     */
    
    #ifndef __XEN_PUBLIC_XEN_H__
    #define __XEN_PUBLIC_XEN_H__
    
    #include "xen-compat.h"
    
    #if defined(__i386__) || defined(__x86_64__)
    #include "arch-x86/xen.h"
    #elif defined(__ia64__)
    #include "arch-ia64.h"
    #else
    #error "Unsupported architecture"
    #endif
    
    #ifndef __ASSEMBLY__
    /* Guest handles for primitive C types. */
    DEFINE_XEN_GUEST_HANDLE(char);
    __DEFINE_XEN_GUEST_HANDLE(uchar, unsigned char);
    DEFINE_XEN_GUEST_HANDLE(int);
    __DEFINE_XEN_GUEST_HANDLE(uint,  unsigned int);
    DEFINE_XEN_GUEST_HANDLE(long);
    __DEFINE_XEN_GUEST_HANDLE(ulong, unsigned long);
    DEFINE_XEN_GUEST_HANDLE(void);
    
    DEFINE_XEN_GUEST_HANDLE(xen_pfn_t);
    #endif
    
    /*
     * HYPERCALLS
     */
    
    #define __HYPERVISOR_set_trap_table        0
    #define __HYPERVISOR_mmu_update            1
    #define __HYPERVISOR_set_gdt               2
    #define __HYPERVISOR_stack_switch          3
    #define __HYPERVISOR_set_callbacks         4
    #define __HYPERVISOR_fpu_taskswitch        5
    #define __HYPERVISOR_sched_op_compat       6 /* compat since 0x00030101 */
    #define __HYPERVISOR_platform_op           7
    #define __HYPERVISOR_set_debugreg          8
    #define __HYPERVISOR_get_debugreg          9
    #define __HYPERVISOR_update_descriptor    10
    #define __HYPERVISOR_memory_op            12
    #define __HYPERVISOR_multicall            13
    #define __HYPERVISOR_update_va_mapping    14
    #define __HYPERVISOR_set_timer_op         15
    #define __HYPERVISOR_event_channel_op_compat 16 /* compat since 0x00030202 */
    #define __HYPERVISOR_xen_version          17
    #define __HYPERVISOR_console_io           18
    #define __HYPERVISOR_physdev_op_compat    19 /* compat since 0x00030202 */
    #define __HYPERVISOR_grant_table_op       20
    #define __HYPERVISOR_vm_assist            21
    #define __HYPERVISOR_update_va_mapping_otherdomain 22
    #define __HYPERVISOR_iret                 23 /* x86 only */
    #define __HYPERVISOR_vcpu_op              24
    #define __HYPERVISOR_set_segment_base     25 /* x86/64 only */
    #define __HYPERVISOR_mmuext_op            26
    #define __HYPERVISOR_xsm_op               27
    #define __HYPERVISOR_nmi_op               28
    #define __HYPERVISOR_sched_op             29
    #define __HYPERVISOR_callback_op          30
    #define __HYPERVISOR_xenoprof_op          31
    #define __HYPERVISOR_event_channel_op     32
    #define __HYPERVISOR_physdev_op           33
    #define __HYPERVISOR_hvm_op               34
    #define __HYPERVISOR_sysctl               35
    #define __HYPERVISOR_domctl               36
    #define __HYPERVISOR_kexec_op             37
    
    /* Architecture-specific hypercall definitions. */
    #define __HYPERVISOR_arch_0               48
    #define __HYPERVISOR_arch_1               49
    #define __HYPERVISOR_arch_2               50
    #define __HYPERVISOR_arch_3               51
   #define __HYPERVISOR_arch_4               52
   #define __HYPERVISOR_arch_5               53
   #define __HYPERVISOR_arch_6               54
   #define __HYPERVISOR_arch_7               55
   
   /*
    * HYPERCALL COMPATIBILITY.
    */
   
   /* New sched_op hypercall introduced in 0x00030101. */
   #if __XEN_INTERFACE_VERSION__ < 0x00030101
   #undef __HYPERVISOR_sched_op
   #define __HYPERVISOR_sched_op __HYPERVISOR_sched_op_compat
   #endif
   
   /* New event-channel and physdev hypercalls introduced in 0x00030202. */
   #if __XEN_INTERFACE_VERSION__ < 0x00030202
   #undef __HYPERVISOR_event_channel_op
   #define __HYPERVISOR_event_channel_op __HYPERVISOR_event_channel_op_compat
   #undef __HYPERVISOR_physdev_op
   #define __HYPERVISOR_physdev_op __HYPERVISOR_physdev_op_compat
   #endif
   
   /* New platform_op hypercall introduced in 0x00030204. */
   #if __XEN_INTERFACE_VERSION__ < 0x00030204
   #define __HYPERVISOR_dom0_op __HYPERVISOR_platform_op
   #endif
   
   /* 
    * VIRTUAL INTERRUPTS
    * 
    * Virtual interrupts that a guest OS may receive from Xen.
    * 
    * In the side comments, 'V.' denotes a per-VCPU VIRQ while 'G.' denotes a
    * global VIRQ. The former can be bound once per VCPU and cannot be re-bound.
    * The latter can be allocated only once per guest: they must initially be
    * allocated to VCPU0 but can subsequently be re-bound.
    */
   #define VIRQ_TIMER      0  /* V. Timebase update, and/or requested timeout.  */
   #define VIRQ_DEBUG      1  /* V. Request guest to dump debug info.           */
   #define VIRQ_CONSOLE    2  /* G. (DOM0) Bytes received on emergency console. */
   #define VIRQ_DOM_EXC    3  /* G. (DOM0) Exceptional event for some domain.   */
   #define VIRQ_TBUF       4  /* G. (DOM0) Trace buffer has records available.  */
   #define VIRQ_DEBUGGER   6  /* G. (DOM0) A domain has paused for debugging.   */
   #define VIRQ_XENOPROF   7  /* V. XenOprofile interrupt: new sample available */
   #define VIRQ_CON_RING   8  /* G. (DOM0) Bytes received on console            */
   
   /* Architecture-specific VIRQ definitions. */
   #define VIRQ_ARCH_0    16
   #define VIRQ_ARCH_1    17
   #define VIRQ_ARCH_2    18
   #define VIRQ_ARCH_3    19
   #define VIRQ_ARCH_4    20
   #define VIRQ_ARCH_5    21
   #define VIRQ_ARCH_6    22
   #define VIRQ_ARCH_7    23
   
   #define NR_VIRQS       24
   
   /*
    * MMU-UPDATE REQUESTS
    * 
    * HYPERVISOR_mmu_update() accepts a list of (ptr, val) pairs.
    * A foreigndom (FD) can be specified (or DOMID_SELF for none).
    * Where the FD has some effect, it is described below.
    * ptr[1:0] specifies the appropriate MMU_* command.
    * 
    * ptr[1:0] == MMU_NORMAL_PT_UPDATE:
    * Updates an entry in a page table. If updating an L1 table, and the new
    * table entry is valid/present, the mapped frame must belong to the FD, if
    * an FD has been specified. If attempting to map an I/O page then the
    * caller assumes the privilege of the FD.
    * FD == DOMID_IO: Permit /only/ I/O mappings, at the priv level of the caller.
    * FD == DOMID_XEN: Map restricted areas of Xen's heap space.
    * ptr[:2]  -- Machine address of the page-table entry to modify.
    * val      -- Value to write.
    * 
    * ptr[1:0] == MMU_MACHPHYS_UPDATE:
    * Updates an entry in the machine->pseudo-physical mapping table.
    * ptr[:2]  -- Machine address within the frame whose mapping to modify.
    *             The frame must belong to the FD, if one is specified.
    * val      -- Value to write into the mapping entry.
    * 
    * ptr[1:0] == MMU_PT_UPDATE_PRESERVE_AD:
    * As MMU_NORMAL_PT_UPDATE above, but A/D bits currently in the PTE are ORed
    * with those in @val.
    */
   #define MMU_NORMAL_PT_UPDATE      0 /* checked '*ptr = val'. ptr is MA.      */
   #define MMU_MACHPHYS_UPDATE       1 /* ptr = MA of frame to modify entry for */
   #define MMU_PT_UPDATE_PRESERVE_AD 2 /* atomically: *ptr = val | (*ptr&(A|D)) */
   
   /*
    * MMU EXTENDED OPERATIONS
    * 
    * HYPERVISOR_mmuext_op() accepts a list of mmuext_op structures.
    * A foreigndom (FD) can be specified (or DOMID_SELF for none).
    * Where the FD has some effect, it is described below.
    * 
    * cmd: MMUEXT_(UN)PIN_*_TABLE
    * mfn: Machine frame number to be (un)pinned as a p.t. page.
    *      The frame must belong to the FD, if one is specified.
    * 
    * cmd: MMUEXT_NEW_BASEPTR
    * mfn: Machine frame number of new page-table base to install in MMU.
    * 
    * cmd: MMUEXT_NEW_USER_BASEPTR [x86/64 only]
    * mfn: Machine frame number of new page-table base to install in MMU
    *      when in user space.
    * 
    * cmd: MMUEXT_TLB_FLUSH_LOCAL
    * No additional arguments. Flushes local TLB.
    * 
    * cmd: MMUEXT_INVLPG_LOCAL
    * linear_addr: Linear address to be flushed from the local TLB.
    * 
    * cmd: MMUEXT_TLB_FLUSH_MULTI
    * vcpumask: Pointer to bitmap of VCPUs to be flushed.
    * 
    * cmd: MMUEXT_INVLPG_MULTI
    * linear_addr: Linear address to be flushed.
    * vcpumask: Pointer to bitmap of VCPUs to be flushed.
    * 
    * cmd: MMUEXT_TLB_FLUSH_ALL
    * No additional arguments. Flushes all VCPUs' TLBs.
    * 
    * cmd: MMUEXT_INVLPG_ALL
    * linear_addr: Linear address to be flushed from all VCPUs' TLBs.
    * 
    * cmd: MMUEXT_FLUSH_CACHE
    * No additional arguments. Writes back and flushes cache contents.
    * 
    * cmd: MMUEXT_SET_LDT
    * linear_addr: Linear address of LDT base (NB. must be page-aligned).
    * nr_ents: Number of entries in LDT.
    */
   #define MMUEXT_PIN_L1_TABLE      0
   #define MMUEXT_PIN_L2_TABLE      1
   #define MMUEXT_PIN_L3_TABLE      2
   #define MMUEXT_PIN_L4_TABLE      3
   #define MMUEXT_UNPIN_TABLE       4
   #define MMUEXT_NEW_BASEPTR       5
   #define MMUEXT_TLB_FLUSH_LOCAL   6
   #define MMUEXT_INVLPG_LOCAL      7
   #define MMUEXT_TLB_FLUSH_MULTI   8
   #define MMUEXT_INVLPG_MULTI      9
   #define MMUEXT_TLB_FLUSH_ALL    10
   #define MMUEXT_INVLPG_ALL       11
   #define MMUEXT_FLUSH_CACHE      12
   #define MMUEXT_SET_LDT          13
   #define MMUEXT_NEW_USER_BASEPTR 15
   
   #ifndef __ASSEMBLY__
   struct mmuext_op {
       unsigned int cmd;
       union {
           /* [UN]PIN_TABLE, NEW_BASEPTR, NEW_USER_BASEPTR */
           xen_pfn_t     mfn;
           /* INVLPG_LOCAL, INVLPG_ALL, SET_LDT */
           unsigned long linear_addr;
       } arg1;
       union {
           /* SET_LDT */
           unsigned int nr_ents;
           /* TLB_FLUSH_MULTI, INVLPG_MULTI */
   #if __XEN_INTERFACE_VERSION__ >= 0x00030205
           XEN_GUEST_HANDLE(void) vcpumask;
   #else
           void *vcpumask;
   #endif
       } arg2;
   };
   typedef struct mmuext_op mmuext_op_t;
   DEFINE_XEN_GUEST_HANDLE(mmuext_op_t);
   #endif
   
   /* These are passed as 'flags' to update_va_mapping. They can be ORed. */
   /* When specifying UVMF_MULTI, also OR in a pointer to a CPU bitmap.   */
   /* UVMF_LOCAL is merely UVMF_MULTI with a NULL bitmap pointer.         */
   #define UVMF_NONE               (0UL<<0) /* No flushing at all.   */
   #define UVMF_TLB_FLUSH          (1UL<<0) /* Flush entire TLB(s).  */
   #define UVMF_INVLPG             (2UL<<0) /* Flush only one entry. */
   #define UVMF_FLUSHTYPE_MASK     (3UL<<0)
   #define UVMF_MULTI              (0UL<<2) /* Flush subset of TLBs. */
   #define UVMF_LOCAL              (0UL<<2) /* Flush local TLB.      */
   #define UVMF_ALL                (1UL<<2) /* Flush all TLBs.       */
   
   /*
    * Commands to HYPERVISOR_console_io().
    */
   #define CONSOLEIO_write         0
   #define CONSOLEIO_read          1
   
   /*
    * Commands to HYPERVISOR_vm_assist().
    */
   #define VMASST_CMD_enable                0
   #define VMASST_CMD_disable               1
   
   /* x86/32 guests: simulate full 4GB segment limits. */
   #define VMASST_TYPE_4gb_segments         0
   
   /* x86/32 guests: trap (vector 15) whenever above vmassist is used. */
   #define VMASST_TYPE_4gb_segments_notify  1
   
   /*
    * x86 guests: support writes to bottom-level PTEs.
    * NB1. Page-directory entries cannot be written.
    * NB2. Guest must continue to remove all writable mappings of PTEs.
    */
   #define VMASST_TYPE_writable_pagetables  2
   
   /* x86/PAE guests: support PDPTs above 4GB. */
   #define VMASST_TYPE_pae_extended_cr3     3
   
   #define MAX_VMASST_TYPE                  3
   
   #ifndef __ASSEMBLY__
   
   typedef uint16_t domid_t;
   
   /* Domain ids >= DOMID_FIRST_RESERVED cannot be used for ordinary domains. */
   #define DOMID_FIRST_RESERVED (0x7FF0U)
   
   /* DOMID_SELF is used in certain contexts to refer to oneself. */
   #define DOMID_SELF (0x7FF0U)
   
   /*
    * DOMID_IO is used to restrict page-table updates to mapping I/O memory.
    * Although no Foreign Domain need be specified to map I/O pages, DOMID_IO
    * is useful to ensure that no mappings to the OS's own heap are accidentally
    * installed. (e.g., in Linux this could cause havoc as reference counts
    * aren't adjusted on the I/O-mapping code path).
    * This only makes sense in MMUEXT_SET_FOREIGNDOM, but in that context can
    * be specified by any calling domain.
    */
   #define DOMID_IO   (0x7FF1U)
   
   /*
    * DOMID_XEN is used to allow privileged domains to map restricted parts of
    * Xen's heap space (e.g., the machine_to_phys table).
    * This only makes sense in MMUEXT_SET_FOREIGNDOM, and is only permitted if
    * the caller is privileged.
    */
   #define DOMID_XEN  (0x7FF2U)
   
   /*
    * Send an array of these to HYPERVISOR_mmu_update().
    * NB. The fields are natural pointer/address size for this architecture.
    */
   struct mmu_update {
       uint64_t ptr;       /* Machine address of PTE. */
       uint64_t val;       /* New contents of PTE.    */
   };
   typedef struct mmu_update mmu_update_t;
   DEFINE_XEN_GUEST_HANDLE(mmu_update_t);
   
   /*
    * Send an array of these to HYPERVISOR_multicall().
    * NB. The fields are natural register size for this architecture.
    */
   struct multicall_entry {
       unsigned long op, result;
       unsigned long args[6];
   };
   typedef struct multicall_entry multicall_entry_t;
   DEFINE_XEN_GUEST_HANDLE(multicall_entry_t);
   
   /*
    * Event channel endpoints per domain:
    *  1024 if a long is 32 bits; 4096 if a long is 64 bits.
    */
   #define NR_EVENT_CHANNELS (sizeof(unsigned long) * sizeof(unsigned long) * 64)
   
   struct vcpu_time_info {
       /*
        * Updates to the following values are preceded and followed by an
        * increment of 'version'. The guest can therefore detect updates by
        * looking for changes to 'version'. If the least-significant bit of
        * the version number is set then an update is in progress and the guest
        * must wait to read a consistent set of values.
        * The correct way to interact with the version number is similar to
        * Linux's seqlock: see the implementations of read_seqbegin/read_seqretry.
        */
       uint32_t version;
       uint32_t pad0;
       uint64_t tsc_timestamp;   /* TSC at last update of time vals.  */
       uint64_t system_time;     /* Time, in nanosecs, since boot.    */
       /*
        * Current system time:
        *   system_time +
        *   ((((tsc - tsc_timestamp) << tsc_shift) * tsc_to_system_mul) >> 32)
        * CPU frequency (Hz):
        *   ((10^9 << 32) / tsc_to_system_mul) >> tsc_shift
        */
       uint32_t tsc_to_system_mul;
       int8_t   tsc_shift;
       int8_t   pad1[3];
   }; /* 32 bytes */
   typedef struct vcpu_time_info vcpu_time_info_t;
   
   struct vcpu_info {
       /*
        * 'evtchn_upcall_pending' is written non-zero by Xen to indicate
        * a pending notification for a particular VCPU. It is then cleared 
        * by the guest OS /before/ checking for pending work, thus avoiding
        * a set-and-check race. Note that the mask is only accessed by Xen
        * on the CPU that is currently hosting the VCPU. This means that the
        * pending and mask flags can be updated by the guest without special
        * synchronisation (i.e., no need for the x86 LOCK prefix).
        * This may seem suboptimal because if the pending flag is set by
        * a different CPU then an IPI may be scheduled even when the mask
        * is set. However, note:
        *  1. The task of 'interrupt holdoff' is covered by the per-event-
        *     channel mask bits. A 'noisy' event that is continually being
        *     triggered can be masked at source at this very precise
        *     granularity.
        *  2. The main purpose of the per-VCPU mask is therefore to restrict
        *     reentrant execution: whether for concurrency control, or to
        *     prevent unbounded stack usage. Whatever the purpose, we expect
        *     that the mask will be asserted only for short periods at a time,
        *     and so the likelihood of a 'spurious' IPI is suitably small.
        * The mask is read before making an event upcall to the guest: a
        * non-zero mask therefore guarantees that the VCPU will not receive
        * an upcall activation. The mask is cleared when the VCPU requests
        * to block: this avoids wakeup-waiting races.
        */
       uint8_t evtchn_upcall_pending;
       uint8_t evtchn_upcall_mask;
       unsigned long evtchn_pending_sel;
       struct arch_vcpu_info arch;
       struct vcpu_time_info time;
   }; /* 64 bytes (x86) */
   #ifndef __XEN__
   typedef struct vcpu_info vcpu_info_t;
   #endif
   
   /*
    * Xen/kernel shared data -- pointer provided in start_info.
    *
    * This structure is defined to be both smaller than a page, and the
    * only data on the shared page, but may vary in actual size even within
    * compatible Xen versions; guests should not rely on the size
    * of this structure remaining constant.
    */
   struct shared_info {
       struct vcpu_info vcpu_info[MAX_VIRT_CPUS];
   
       /*
        * A domain can create "event channels" on which it can send and receive
        * asynchronous event notifications. There are three classes of event that
        * are delivered by this mechanism:
        *  1. Bi-directional inter- and intra-domain connections. Domains must
        *     arrange out-of-band to set up a connection (usually by allocating
        *     an unbound 'listener' port and avertising that via a storage service
        *     such as xenstore).
        *  2. Physical interrupts. A domain with suitable hardware-access
        *     privileges can bind an event-channel port to a physical interrupt
        *     source.
        *  3. Virtual interrupts ('events'). A domain can bind an event-channel
        *     port to a virtual interrupt source, such as the virtual-timer
        *     device or the emergency console.
        * 
        * Event channels are addressed by a "port index". Each channel is
        * associated with two bits of information:
        *  1. PENDING -- notifies the domain that there is a pending notification
        *     to be processed. This bit is cleared by the guest.
        *  2. MASK -- if this bit is clear then a 0->1 transition of PENDING
        *     will cause an asynchronous upcall to be scheduled. This bit is only
        *     updated by the guest. It is read-only within Xen. If a channel
        *     becomes pending while the channel is masked then the 'edge' is lost
        *     (i.e., when the channel is unmasked, the guest must manually handle
        *     pending notifications as no upcall will be scheduled by Xen).
        * 
        * To expedite scanning of pending notifications, any 0->1 pending
        * transition on an unmasked channel causes a corresponding bit in a
        * per-vcpu selector word to be set. Each bit in the selector covers a
        * 'C long' in the PENDING bitfield array.
        */
       unsigned long evtchn_pending[sizeof(unsigned long) * 8];
       unsigned long evtchn_mask[sizeof(unsigned long) * 8];
   
       /*
        * Wallclock time: updated only by control software. Guests should base
        * their gettimeofday() syscall on this wallclock-base value.
        */
       uint32_t wc_version;      /* Version counter: see vcpu_time_info_t. */
       uint32_t wc_sec;          /* Secs  00:00:00 UTC, Jan 1, 1970.  */
       uint32_t wc_nsec;         /* Nsecs 00:00:00 UTC, Jan 1, 1970.  */
   
       struct arch_shared_info arch;
   
   };
   #ifndef __XEN__
   typedef struct shared_info shared_info_t;
   #endif
   
   /*
    * Start-of-day memory layout:
    *  1. The domain is started within contiguous virtual-memory region.
    *  2. The contiguous region ends on an aligned 4MB boundary.
    *  3. This the order of bootstrap elements in the initial virtual region:
    *      a. relocated kernel image
    *      b. initial ram disk              [mod_start, mod_len]
    *      c. list of allocated page frames [mfn_list, nr_pages]
    *      d. start_info_t structure        [register ESI (x86)]
    *      e. bootstrap page tables         [pt_base, CR3 (x86)]
    *      f. bootstrap stack               [register ESP (x86)]
    *  4. Bootstrap elements are packed together, but each is 4kB-aligned.
    *  5. The initial ram disk may be omitted.
    *  6. The list of page frames forms a contiguous 'pseudo-physical' memory
    *     layout for the domain. In particular, the bootstrap virtual-memory
    *     region is a 1:1 mapping to the first section of the pseudo-physical map.
    *  7. All bootstrap elements are mapped read-writable for the guest OS. The
    *     only exception is the bootstrap page table, which is mapped read-only.
    *  8. There is guaranteed to be at least 512kB padding after the final
    *     bootstrap element. If necessary, the bootstrap virtual region is
    *     extended by an extra 4MB to ensure this.
    */
   
   #define MAX_GUEST_CMDLINE 1024
   struct start_info {
       /* THE FOLLOWING ARE FILLED IN BOTH ON INITIAL BOOT AND ON RESUME.    */
       char magic[32];             /* "xen-<version>-<platform>".            */
       unsigned long nr_pages;     /* Total pages allocated to this domain.  */
       unsigned long shared_info;  /* MACHINE address of shared info struct. */
       uint32_t flags;             /* SIF_xxx flags.                         */
       xen_pfn_t store_mfn;        /* MACHINE page number of shared page.    */
       uint32_t store_evtchn;      /* Event channel for store communication. */
       union {
           struct {
               xen_pfn_t mfn;      /* MACHINE page number of console page.   */
               uint32_t  evtchn;   /* Event channel for console page.        */
           } domU;
           struct {
               uint32_t info_off;  /* Offset of console_info struct.         */
               uint32_t info_size; /* Size of console_info struct from start.*/
           } dom0;
       } console;
       /* THE FOLLOWING ARE ONLY FILLED IN ON INITIAL BOOT (NOT RESUME).     */
       unsigned long pt_base;      /* VIRTUAL address of page directory.     */
       unsigned long nr_pt_frames; /* Number of bootstrap p.t. frames.       */
       unsigned long mfn_list;     /* VIRTUAL address of page-frame list.    */
       unsigned long mod_start;    /* VIRTUAL address of pre-loaded module.  */
       unsigned long mod_len;      /* Size (bytes) of pre-loaded module.     */
       int8_t cmd_line[MAX_GUEST_CMDLINE];
   };
   typedef struct start_info start_info_t;
   
   /* New console union for dom0 introduced in 0x00030203. */
   #if __XEN_INTERFACE_VERSION__ < 0x00030203
   #define console_mfn    console.domU.mfn
   #define console_evtchn console.domU.evtchn
   #endif
   
   /* These flags are passed in the 'flags' field of start_info_t. */
   #define SIF_PRIVILEGED    (1<<0)  /* Is the domain privileged? */
   #define SIF_INITDOMAIN    (1<<1)  /* Is this the initial control domain? */
   #define SIF_PM_MASK       (0xFF<<8) /* reserve 1 byte for xen-pm options */
   
   typedef struct dom0_vga_console_info {
       uint8_t video_type; /* DOM0_VGA_CONSOLE_??? */
   #define XEN_VGATYPE_TEXT_MODE_3 0x03
   #define XEN_VGATYPE_VESA_LFB    0x23
   
       union {
           struct {
               /* Font height, in pixels. */
               uint16_t font_height;
               /* Cursor location (column, row). */
               uint16_t cursor_x, cursor_y;
               /* Number of rows and columns (dimensions in characters). */
               uint16_t rows, columns;
           } text_mode_3;
   
           struct {
               /* Width and height, in pixels. */
               uint16_t width, height;
               /* Bytes per scan line. */
               uint16_t bytes_per_line;
               /* Bits per pixel. */
               uint16_t bits_per_pixel;
               /* LFB physical address, and size (in units of 64kB). */
               uint32_t lfb_base;
               uint32_t lfb_size;
               /* RGB mask offsets and sizes, as defined by VBE 1.2+ */
               uint8_t  red_pos, red_size;
               uint8_t  green_pos, green_size;
               uint8_t  blue_pos, blue_size;
               uint8_t  rsvd_pos, rsvd_size;
   #if __XEN_INTERFACE_VERSION__ >= 0x00030206
               /* VESA capabilities (offset 0xa, VESA command 0x4f00). */
               uint32_t gbl_caps;
               /* Mode attributes (offset 0x0, VESA command 0x4f01). */
               uint16_t mode_attrs;
   #endif
           } vesa_lfb;
       } u;
   } dom0_vga_console_info_t;
   #define xen_vga_console_info dom0_vga_console_info
   #define xen_vga_console_info_t dom0_vga_console_info_t
   
   typedef uint8_t xen_domain_handle_t[16];
   
   /* Turn a plain number into a C unsigned long constant. */
   #define __mk_unsigned_long(x) x ## UL
   #define mk_unsigned_long(x) __mk_unsigned_long(x)
   
   __DEFINE_XEN_GUEST_HANDLE(uint8,  uint8_t);
   __DEFINE_XEN_GUEST_HANDLE(uint16, uint16_t);
   __DEFINE_XEN_GUEST_HANDLE(uint32, uint32_t);
   __DEFINE_XEN_GUEST_HANDLE(uint64, uint64_t);
   
   #else /* __ASSEMBLY__ */
   
   /* In assembly code we cannot use C numeric constant suffixes. */
   #define mk_unsigned_long(x) x
   
   #endif /* !__ASSEMBLY__ */
   
   /* Default definitions for macros used by domctl/sysctl. */
   #if defined(__XEN__) || defined(__XEN_TOOLS__)
   #ifndef uint64_aligned_t
   #define uint64_aligned_t uint64_t
   #endif
   #ifndef XEN_GUEST_HANDLE_64
   #define XEN_GUEST_HANDLE_64(name) XEN_GUEST_HANDLE(name)
   #endif
   #endif
   
   #endif /* __XEN_PUBLIC_XEN_H__ */
   
   /*
    * Local variables:
    * mode: C
    * c-set-style: "BSD"
    * c-basic-offset: 4
    * tab-width: 4
    * indent-tabs-mode: nil
    * End:
    */

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