osfmk/i386/commpage/commpage.h

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