osfmk/i386/commpage/commpage.h

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30
  31 #ifndef _I386_COMMPAGE_H
  32 #define _I386_COMMPAGE_H
  33
  34 #ifndef __ASSEMBLER__
  35 #include <stdint.h>
  36 #endif /* __ASSEMBLER__ */
  37
  38 #ifdef  __ASSEMBLER__
  39 #include <machine/asm.h>
  40
  41 #define COMMPAGE_DESCRIPTOR(label,address,must,cant)    \
  42 L ## label ## _end:                                     ;\
  43 .const_data                                             ;\
  44 L ## label ## _size = L ## label ## _end - L ## label   ;\
  45 .private_extern _commpage_ ## label                     ;\
  46 _commpage_ ## label ## :                                ;\
  47     .long       L ## label                              ;\
  48     .long       L ## label ## _size                     ;\
  49     .long       address                                 ;\
  50     .long       must                                    ;\
  51     .long       cant                                    ;\
  52 .text
  53
  54 #else /* __ASSEMBLER__ */
  55
  56 /* Each potential commpage routine is described by one of these.
  57  * Note that the COMMPAGE_DESCRIPTOR macro (above), used in
  58  * assembly language, must agree with this.
  59  */
  60
  61 typedef struct  commpage_descriptor     {
  62     void        *code_address;                                  // address of code
  63     long        code_length;                                    // length in bytes
  64     long        commpage_address;                               // put at this address (_COMM_PAGE_BCOPY etc)
  65     long        musthave;                                       // _cpu_capability bits we must have
  66     long        canthave;                                       // _cpu_capability bits we can't have
  67 } commpage_descriptor;
  68
  69
  70 extern  char    *commPagePtr;                           // virt address of commpage in kernel map
  71
  72 extern  void    commpage_set_timestamp(uint64_t tbr,uint32_t secs,uint32_t usecs,uint32_t ticks_per_sec);
  73
  74 typedef struct {
  75         uint64_t        nt_base_tsc;
  76         uint64_t        nt_base_ns;
  77         uint32_t        nt_scale;
  78         uint32_t        nt_shift;
  79         uint64_t        nt_check_tsc;
  80 } commpage_nanotime_t;
  81 extern  void    commpage_set_nanotime(commpage_nanotime_t *new_nanotime);
  82
  83 #endif  /* __ASSEMBLER__ */
  84
  85 #endif /* _I386_COMMPAGE_H */