usr/src/uts/i86pc/ml/comm_page.s

   1
   2 /*
   3  * This file and its contents are supplied under the terms of the
   4  * Common Development and Distribution License ("CDDL"), version 1.0.
   5  * You may only use this file in accordance with the terms of version
   6  * 1.0 of the CDDL.
   7  *
   8  * A full copy of the text of the CDDL should have accompanied this
   9  * source.  A copy of the CDDL is also available via the Internet at
  10  * http://www.illumos.org/license/CDDL.
  11  */
  12
  13 /*
  14  * Copyright 2016 Joyent, Inc.
  15  */
  16
  17 #include <sys/asm_linkage.h>
  18 #include <sys/asm_misc.h>
  19 #include <sys/param.h>
  20 #include <sys/comm_page.h>
  21 #include <sys/tsc.h>
  22
  23 #if defined(_GENCTF) || defined(__lint)
  24
  25 hrtime_t tsc_last;
  26 hrtime_t tsc_resume_cap;
  27 hrtime_t tsc_hrtime_base;
  28 uint32_t tsc_max_delta;
  29 volatile uint32_t hres_lock;
  30 uint32_t tsc_type;
  31 uint32_t nsec_scale;
  32 int64_t hrestime_adj;
  33 hrtime_t hres_last_tick;
  34 uint32_t tsc_ncpu;
  35 volatile timestruc_t hrestime;
  36 hrtime_t tsc_sync_tick_delta[NCPU];
  37
  38 comm_page_t comm_page;
  39
  40 #else /* defined(_GENCTF) || defined(__lint) */
  41
  42 #include "assym.h"
  43
  44 /*
  45  * x86 Comm Page
  46  *
  47  * This is the definition for the comm page on x86.  The purpose of this struct
  48  * is to consolidate certain pieces of kernel state into one contiguous section
  49  * of memory in order for it to be exposed (read-only) to userspace.  The
  50  * struct contents are defined by hand so that member variables will maintain
  51  * their original symbols for use throughout the rest of the kernel.  This
  52  * layout must exactly match the C definition of comm_page_t.
  53  * See: "uts/i86pc/sys/comm_page.h"
  54  */
  55
  56         .data
  57         DGDEF3(comm_page, COMM_PAGE_S_SIZE, 4096)
  58         DGDEF2(tsc_last, 8)
  59         .fill   1, 8, 0
  60         DGDEF2(tsc_hrtime_base, 8)
  61         .fill   1, 8, 0
  62         DGDEF2(tsc_resume_cap, 8)
  63         .fill   1, 8, 0
  64         DGDEF2(tsc_type, 4);
  65         .fill   1, 4, _CONST(TSC_RDTSC_CPUID)
  66         DGDEF2(tsc_max_delta, 4);
  67         .fill   1, 4, 0
  68         DGDEF2(hres_lock, 4);
  69         .fill   1, 4, 0
  70         DGDEF2(nsec_scale, 4);
  71         .fill   1, 4, 0
  72         DGDEF2(hrestime_adj, 8)
  73         .fill   1, 8, 0
  74         DGDEF2(hres_last_tick, 8)
  75         .fill   1, 8, 0
  76         DGDEF2(tsc_ncpu, 4)
  77         .fill   1, 4, 0
  78         /* _cp_pad */
  79         .fill   1, 4, 0
  80         DGDEF2(hrestime, _MUL(2, 8))
  81         .fill   2, 8, 0
  82         DGDEF2(tsc_sync_tick_delta, _MUL(NCPU, 8))
  83         .fill   _CONST(NCPU), 8, 0
  84
  85         /* pad out the rest of the page from the struct end */
  86         .fill   _CONST(COMM_PAGE_SIZE - COMM_PAGE_S_SIZE), 1, 0
  87
  88 #endif /* defined(_GENCTF) || defined(__lint) */