The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /******************************************************************************
    2  * tmem.h
    3  * 
    4  * Guest OS interface to Xen Transcendent Memory.
    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) 2004, K A Fraser
   25  */
   26 
   27 #ifndef __XEN_PUBLIC_TMEM_H__
   28 #define __XEN_PUBLIC_TMEM_H__
   29 
   30 #include "xen.h"
   31 
   32 /* version of ABI */
   33 #define TMEM_SPEC_VERSION          1
   34 
   35 /* Commands to HYPERVISOR_tmem_op() */
   36 #ifdef __XEN__
   37 #define TMEM_CONTROL               0 /* Now called XEN_SYSCTL_tmem_op */
   38 #else
   39 #undef TMEM_CONTROL
   40 #endif
   41 #define TMEM_NEW_POOL              1
   42 #define TMEM_DESTROY_POOL          2
   43 #define TMEM_PUT_PAGE              4
   44 #define TMEM_GET_PAGE              5
   45 #define TMEM_FLUSH_PAGE            6
   46 #define TMEM_FLUSH_OBJECT          7
   47 #if __XEN_INTERFACE_VERSION__ < 0x00040400
   48 #define TMEM_NEW_PAGE              3
   49 #define TMEM_READ                  8
   50 #define TMEM_WRITE                 9
   51 #define TMEM_XCHG                 10
   52 #endif
   53 
   54 /* Privileged commands to HYPERVISOR_tmem_op() */
   55 #define TMEM_AUTH                 101
   56 #define TMEM_RESTORE_NEW          102
   57 
   58 /* Bits for HYPERVISOR_tmem_op(TMEM_NEW_POOL) */
   59 #define TMEM_POOL_PERSIST          1
   60 #define TMEM_POOL_SHARED           2
   61 #define TMEM_POOL_PRECOMPRESSED    4
   62 #define TMEM_POOL_PAGESIZE_SHIFT   4
   63 #define TMEM_POOL_PAGESIZE_MASK  0xf
   64 #define TMEM_POOL_VERSION_SHIFT   24
   65 #define TMEM_POOL_VERSION_MASK  0xff
   66 #define TMEM_POOL_RESERVED_BITS  0x00ffff00
   67 
   68 /* Bits for client flags (save/restore) */
   69 #define TMEM_CLIENT_COMPRESS       1
   70 #define TMEM_CLIENT_FROZEN         2
   71 
   72 /* Special errno values */
   73 #define EFROZEN                 1000
   74 #define EEMPTY                  1001
   75 
   76 struct xen_tmem_oid {
   77     uint64_t oid[3];
   78 };
   79 typedef struct xen_tmem_oid xen_tmem_oid_t;
   80 DEFINE_XEN_GUEST_HANDLE(xen_tmem_oid_t);
   81 
   82 #ifndef __ASSEMBLY__
   83 #if __XEN_INTERFACE_VERSION__ < 0x00040400
   84 typedef xen_pfn_t tmem_cli_mfn_t;
   85 #endif
   86 typedef XEN_GUEST_HANDLE(char) tmem_cli_va_t;
   87 struct tmem_op {
   88     uint32_t cmd;
   89     int32_t pool_id;
   90     union {
   91         struct {
   92             uint64_t uuid[2];
   93             uint32_t flags;
   94             uint32_t arg1;
   95         } creat; /* for cmd == TMEM_NEW_POOL, TMEM_AUTH, TMEM_RESTORE_NEW */
   96         struct {
   97 #if __XEN_INTERFACE_VERSION__ < 0x00040600
   98             uint64_t oid[3];
   99 #else
  100             xen_tmem_oid_t oid;
  101 #endif
  102             uint32_t index;
  103             uint32_t tmem_offset;
  104             uint32_t pfn_offset;
  105             uint32_t len;
  106             xen_pfn_t cmfn; /* client machine page frame */
  107         } gen; /* for all other cmd ("generic") */
  108     } u;
  109 };
  110 typedef struct tmem_op tmem_op_t;
  111 DEFINE_XEN_GUEST_HANDLE(tmem_op_t);
  112 #endif
  113 
  114 #endif /* __XEN_PUBLIC_TMEM_H__ */
  115 
  116 /*
  117  * Local variables:
  118  * mode: C
  119  * c-file-style: "BSD"
  120  * c-basic-offset: 4
  121  * tab-width: 4
  122  * indent-tabs-mode: nil
  123  * End:
  124  */

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