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Annotation of Gnu-Mach/xen/public/callback.h, revision 1.1

1.1     ! root        1: /******************************************************************************
        !             2:  * callback.h
        !             3:  *
        !             4:  * Register guest OS callbacks with Xen.
        !             5:  *
        !             6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
        !             7:  * of this software and associated documentation files (the "Software"), to
        !             8:  * deal in the Software without restriction, including without limitation the
        !             9:  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
        !            10:  * sell copies of the Software, and to permit persons to whom the Software is
        !            11:  * furnished to do so, subject to the following conditions:
        !            12:  *
        !            13:  * The above copyright notice and this permission notice shall be included in
        !            14:  * all copies or substantial portions of the Software.
        !            15:  *
        !            16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
        !            17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
        !            19:  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        !            20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
        !            21:  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
        !            22:  * DEALINGS IN THE SOFTWARE.
        !            23:  *
        !            24:  * Copyright (c) 2006, Ian Campbell
        !            25:  */
        !            26: 
        !            27: #ifndef __XEN_PUBLIC_CALLBACK_H__
        !            28: #define __XEN_PUBLIC_CALLBACK_H__
        !            29: 
        !            30: #include "xen.h"
        !            31: 
        !            32: /*
        !            33:  * Prototype for this hypercall is:
        !            34:  *   long callback_op(int cmd, void *extra_args)
        !            35:  * @cmd        == CALLBACKOP_??? (callback operation).
        !            36:  * @extra_args == Operation-specific extra arguments (NULL if none).
        !            37:  */
        !            38: 
        !            39: /* ia64, x86: Callback for event delivery. */
        !            40: #define CALLBACKTYPE_event                 0
        !            41: 
        !            42: /* x86: Failsafe callback when guest state cannot be restored by Xen. */
        !            43: #define CALLBACKTYPE_failsafe              1
        !            44: 
        !            45: /* x86/64 hypervisor: Syscall by 64-bit guest app ('64-on-64-on-64'). */
        !            46: #define CALLBACKTYPE_syscall               2
        !            47: 
        !            48: /*
        !            49:  * x86/32 hypervisor: Only available on x86/32 when supervisor_mode_kernel
        !            50:  *     feature is enabled. Do not use this callback type in new code.
        !            51:  */
        !            52: #define CALLBACKTYPE_sysenter_deprecated   3
        !            53: 
        !            54: /* x86: Callback for NMI delivery. */
        !            55: #define CALLBACKTYPE_nmi                   4
        !            56: 
        !            57: /*
        !            58:  * x86: sysenter is only available as follows:
        !            59:  * - 32-bit hypervisor: with the supervisor_mode_kernel feature enabled
        !            60:  * - 64-bit hypervisor: 32-bit guest applications on Intel CPUs
        !            61:  *                      ('32-on-32-on-64', '32-on-64-on-64')
        !            62:  *                      [nb. also 64-bit guest applications on Intel CPUs
        !            63:  *                           ('64-on-64-on-64'), but syscall is preferred]
        !            64:  */
        !            65: #define CALLBACKTYPE_sysenter              5
        !            66: 
        !            67: /*
        !            68:  * x86/64 hypervisor: Syscall by 32-bit guest app on AMD CPUs
        !            69:  *                    ('32-on-32-on-64', '32-on-64-on-64')
        !            70:  */
        !            71: #define CALLBACKTYPE_syscall32             7
        !            72: 
        !            73: /*
        !            74:  * Disable event deliver during callback? This flag is ignored for event and
        !            75:  * NMI callbacks: event delivery is unconditionally disabled.
        !            76:  */
        !            77: #define _CALLBACKF_mask_events             0
        !            78: #define CALLBACKF_mask_events              (1U << _CALLBACKF_mask_events)
        !            79: 
        !            80: /*
        !            81:  * Register a callback.
        !            82:  */
        !            83: #define CALLBACKOP_register                0
        !            84: struct callback_register {
        !            85:     uint16_t type;
        !            86:     uint16_t flags;
        !            87:     xen_callback_t address;
        !            88: };
        !            89: typedef struct callback_register callback_register_t;
        !            90: DEFINE_XEN_GUEST_HANDLE(callback_register_t);
        !            91: 
        !            92: /*
        !            93:  * Unregister a callback.
        !            94:  *
        !            95:  * Not all callbacks can be unregistered. -EINVAL will be returned if
        !            96:  * you attempt to unregister such a callback.
        !            97:  */
        !            98: #define CALLBACKOP_unregister              1
        !            99: struct callback_unregister {
        !           100:     uint16_t type;
        !           101:     uint16_t _unused;
        !           102: };
        !           103: typedef struct callback_unregister callback_unregister_t;
        !           104: DEFINE_XEN_GUEST_HANDLE(callback_unregister_t);
        !           105: 
        !           106: #if __XEN_INTERFACE_VERSION__ < 0x00030207
        !           107: #undef CALLBACKTYPE_sysenter
        !           108: #define CALLBACKTYPE_sysenter CALLBACKTYPE_sysenter_deprecated
        !           109: #endif
        !           110: 
        !           111: #endif /* __XEN_PUBLIC_CALLBACK_H__ */
        !           112: 
        !           113: /*
        !           114:  * Local variables:
        !           115:  * mode: C
        !           116:  * c-set-style: "BSD"
        !           117:  * c-basic-offset: 4
        !           118:  * tab-width: 4
        !           119:  * indent-tabs-mode: nil
        !           120:  * End:
        !           121:  */

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