osfmk/i386/postcode.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_POSTCODE_H_
  30 #define _I386_POSTCODE_H_
  31
  32 #ifndef DEBUG
  33 #include <debug.h>
  34 #endif
  35
  36 /* Define this to delay about 1 sec after posting each code */
  37 /* #define POSTCODE_DELAY 1 */
  38
  39 /* The POSTCODE is port 0x80 */
  40 #define POSTPORT 0x80
  41
  42 #define SPINCOUNT       100000000
  43 #define CPU_PAUSE()     rep; nop
  44
  45 #if DEBUG
  46 /*
  47  * Macro to output byte value to postcode, destoying register al.
  48  * Additionally, if POSTCODE_DELAY, spin for about a second.
  49  */
  50 #if POSTCODE_DELAY
  51 #define POSTCODE_AL                     \
  52         outb    %al,$(POSTPORT);        \
  53         movl    $(SPINCOUNT), %eax;     \
  54 1:                                      \
  55         CPU_PAUSE();                    \
  56         decl    %eax;                   \
  57         jne     1b
  58 #else
  59 #define POSTCODE_AL                     \
  60         outb    %al,$(POSTPORT)
  61 #endif /* POSTCODE_DELAY */
  62
  63 #define POSTCODE(XX)                    \
  64         mov     $(XX), %al;             \
  65         POSTCODE_AL
  66
  67 /* Output byte value to postcode, without destoying register eax */
  68 #define POSTCODE_SAVE_EAX(XX)           \
  69         push    %eax;                   \
  70         POSTCODE(XX);                   \
  71         pop     %eax
  72
  73 /*
  74  * Display a 32-bit value to the post card - low byte to high byte
  75  * Entry: value in %ebx
  76  * Exit: %ebx preserved; %eax destroyed
  77  */
  78 #define POSTCODE32_EBX                  \
  79         roll    $8, %ebx;               \
  80         movl    %ebx, %eax;             \
  81         POSTCODE_AL;                    \
  82                                         \
  83         roll    $8, %ebx;               \
  84         movl    %ebx, %eax;             \
  85         POSTCODE_AL;                    \
  86                                         \
  87         roll    $8, %ebx;               \
  88         movl    %ebx, %eax;             \
  89         POSTCODE_AL;                    \
  90                                         \
  91         roll    $8, %ebx;               \
  92         movl    %ebx, %eax;             \
  93         POSTCODE_AL
  94
  95 #else   /* DEBUG */
  96 #define POSTCODE_AL
  97 #define POSTCODE(X)
  98 #define POSTCODE32_EBX
  99 #endif  /* DEBUG */
 100
 101 /*
 102  * The following postcodes are defined for stages of early startup:
 103  */
 104
 105 #define PSTART_ENTRY            0xFF
 106 #define PSTART_PAGE_TABLES      0xFE
 107 #define PSTART_BEFORE_PAGING    0xFD
 108 #define VSTART_ENTRY            0xFC
 109 #define VSTART_STACK_SWITCH     0xFB
 110 #define VSTART_EXIT             0xFA
 111 #define I386_INIT_ENTRY         0xF9
 112 #define CPU_INIT_D              0xF8
 113 #define PROCESSOR_BOOTSTRAP_D   0xF7
 114 #define PE_INIT_PLATFORM_D      0xF6
 115 #define THREAD_BOOTSTRAP_D      0xF5
 116
 117 #define SLAVE_PSTART_ENTRY      0xEF
 118 #define REAL_TO_PROT_ENTRY      0xEE
 119 #define REAL_TO_PROT_EXIT       0xED
 120 #define STARTPROG_ENTRY         0xEC
 121 #define STARTPROG_EXIT          0xEB
 122 #define SLAVE_START_ENTRY       0xEA
 123 #define SLAVE_START_EXIT        0xE9
 124 #define SVSTART_ENTRY           0xE8
 125 #define SVSTART_DESC_INIT       0xE7
 126 #define SVSTART_STACK_SWITCH    0xE6
 127 #define SVSTART_EXIT            0xE5
 128 #define I386_INIT_SLAVE         0xE4
 129
 130 #define MP_KDP_ENTER            0xDB            /* Machine in kdp DeBugger */
 131 #define PANIC_HLT               0xD1            /* Die an early death */
 132
 133 #define ACPI_WAKE_START_ENTRY   0xCF
 134 #define ACPI_WAKE_PROT_ENTRY    0xCE
 135 #define ACPI_WAKE_PAGED_ENTRY   0xCD
 136
 137 #ifndef ASSEMBLER
 138 inline static void
 139 _postcode_delay(uint32_t        spincount)
 140 {
 141         asm volatile("1:                        \n\t"
 142                      "  rep; nop;               \n\t"
 143                      "  decl %%eax;             \n\t"
 144                      "  jne 1b"
 145                      : : "a" (spincount));
 146 }
 147 inline static void
 148 _postcode(uint8_t       xx)
 149 {
 150         asm volatile("outb %0, %1" : : "a" (xx), "N" (POSTPORT));
 151 }
 152 #if     DEBUG
 153 inline static void
 154 postcode(uint8_t        xx)
 155 {
 156         _postcode(xx);
 157 #if     POSTCODE_DELAY
 158         _postcode_delay(SPINCOUNT);
 159 #endif
 160 }
 161 #else
 162 #define postcode(xx)
 163 #endif
 164 #endif
 165
 166 #endif /* _I386_POSTCODE_H_ */