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annotate packages/hal/i386/pc/current/include/platform.inc @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
parents 435cced73e2f
children d2f49caf9e38
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1 #ifndef CYGONCE_HAL_PLATFORM_INC
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2 #define CYGONCE_HAL_PLATFORM_INC
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3 ##=============================================================================
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4 ##
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5 ## platform.inc
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6 ##
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7 ## PC platform support
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8 ##
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9 ##=============================================================================
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10 #####COPYRIGHTBEGIN####
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11 #
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12 # -------------------------------------------
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13 # The contents of this file are subject to the Red Hat eCos Public License
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14 # Version 1.1 (the "License"); you may not use this file except in
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15 # compliance with the License. You may obtain a copy of the License at
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16 # http://www.redhat.com/
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17 #
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18 # Software distributed under the License is distributed on an "AS IS"
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19 # basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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20 # License for the specific language governing rights and limitations under
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21 # the License.
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22 #
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23 # The Original Code is eCos - Embedded Configurable Operating System,
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24 # released September 30, 1998.
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25 #
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26 # The Initial Developer of the Original Code is Red Hat.
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27 # Portions created by Red Hat are
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28 # Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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29 # All Rights Reserved.
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30 # -------------------------------------------
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31 #
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32 #####COPYRIGHTEND####
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33 ##=============================================================================
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34 #######DESCRIPTIONBEGIN####
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35 ##
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36 ## Author(s): jskov
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37 ## Contributors:jskov, pjo, nickg
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38 ## Date: 1999-01-07
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39 ## Purpose: PC platform support
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40 ## Description: This file contains any PC specific assembler macros needed to
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41 ## run eCos on a standard i386 PC.
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42 ##
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43 ##
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44 ######DESCRIPTIONEND####
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45 ##
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46 ##=============================================================================
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47
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48 #include <cyg/hal/i386.inc>
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49
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50
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51 ##=============================================================================
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52 ## CPU initialization
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53
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54 #define CYGPKG_HAL_I386_CPU_INIT_DEFINED
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55
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56 .macro hal_cpu_init
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57
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58 #ifdef CYG_HAL_STARTUP_FLOPPY
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59
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60 /* This code is loaded from a floppy disk when the PC powers up. */
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61
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62 .code16
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63
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64 .extern _end
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65
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66 sectorsPerTrack = 18
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67 bytesPerSector = 512
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68 bytesPerTrack = sectorsPerTrack * bytesPerSector
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69 dptLength = 3 /* words. */
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70
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71 cld /* always count up. */
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72
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73 /* Configure a stack that we can use. */
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74
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75 movl $_start, %eax
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76 movw %ax, %sp
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77 shr $4, %eax
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78 andl $0xF000, %eax
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79 movw %ax, %ss
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80
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81 /* Ask the BIOS for info about the amount of RAM available. We push these
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82 onto the stack for later use.
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83 */
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84
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85 xorl %eax, %eax
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86 movb $0x88, %ah /* Get the amount of extended memory. */
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87 int $0x15
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88 shl $10, %eax
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89 pushl %eax
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90
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91 xorl %eax, %eax
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92 int $0x12 /* Get the amount of standard memory. */
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93 shl $10, %eax
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94 pushl %eax
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95
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96
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97 /* Read the rest of the image to _start. This code works by reading a track
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98 at a time...
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99 */
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100
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101 movl $_edata, %eax
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102 movl $_start, %ebx /* Our destination address. */
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103 subl %ebx, %eax /* Number of bytes in the image. */
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104 movl $1, %ecx /* Track/sector to read from (starts at 1). */
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105
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106 0:
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107 cmpl $0, %eax
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108 jle 1f
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109
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110 pushl %eax /* Save the number of bytes we want. */
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111 pushl %ebx /* Save our current address. */
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112 pushl %ecx /* Save our disk location. */
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113
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114 /* Read in a track with head 0. */
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115
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116 movl %ebx, %eax /* Put our address into ES:BX. */
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117 shr $4, %eax
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118 movw %ax, %es
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119 andl $0xF, %ebx
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120 movw $0, %dx /* Disk 0, head 0 */
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121 movb $0x02, %ah
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122 movb $sectorsPerTrack, %al /* Read the entire track. */
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123 movb $1, %cl
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124 int $0x13 /* CX points to our track/sector. */
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125
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126 /* So go ahead and resume execution at the real starting address. This
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127 only serves to move us quickly to the real starting location; and has
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128 no effect after reading additional tracks. If we didn't jump after
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129 reading the first track, then we limit ourselves to reading images of
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jlarmour
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diff changeset
130 30k bytes max before overwriting ourselves at 0x7C00.
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
131 */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
132
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
133 ljmp $0, $2f
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
134 hlt
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
135
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
136 .align 4
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
137 2:
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
138
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
139 popl %ecx
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
140 popl %ebx
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
141 popl %eax
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
142
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
143 /* Add our length to the address. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
144 addl $bytesPerTrack, %ebx
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
145 subl $bytesPerTrack, %eax
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
146
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
147 /* Maybe read in a track with head 1. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
148 cmpl $0, %eax
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
149 jle 1f
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
150
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
151 pushl %eax /* Save the number of bytes we want. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
152 pushl %ebx /* Save our current address. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
153 pushl %ecx
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
154
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
155 movl %ebx, %eax /* Put our address into ES:BX. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
156 shr $4, %eax
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
157 movw %ax, %es
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
158 andl $0xF, %ebx
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
159 movw $0x0100, %dx /* Disk 0, head 1 */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
160 movb $0x02, %ah
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
161 movb $sectorsPerTrack, %al /* Read the entire track. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
162 movb $1, %cl
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
163 int $0x13 /* CX points to our track/sector. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
164
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
165 popl %ecx
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
166 popl %ebx
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
167 popl %eax
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
168
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
169 /* Add our length to the address. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
170 addl $bytesPerTrack, %ebx
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
171 subl $bytesPerTrack, %eax
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
172
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
173 /* Move to the next track. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
174 addb $0x1, %ch
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
175
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
176 jmp 0b
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
177
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
178 /* Write the 0x55/0xAA signature at the end of the first
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
179 block. Without this signature the BIOS won't consider this
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
180 block to be bootable.
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
181 */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
182
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
183 . = _start + 510
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
184 .byte 0x55
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
185 .byte 0xAA
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
186
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
187
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
188 1:
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
189
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
190 /* Lets be nice and wait for the diskette drive motor to go off before continuing. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
191
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
192 movw $0x40, %ax
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
193 movw %ax, %es
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
194 movl $0x40, %ebx
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
195 2: es
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
196 movb (%bx), %al
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
197 cmpb $0, %al
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
198 jne 2b
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
199
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
200 /* Now we're all loaded up in memory. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
201
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
202 /* Disable interrupt handling. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
203 cli
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
204
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
205 /* Load GDTR and IDTR. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
206
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
207 lgdt %cs:gdt
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
208 lidt %cs:idt
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
209
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
210 /* Switch to protected mode. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
211 movl %cr0,%eax
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
212 orb $1, %al
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
213 movl %eax,%cr0
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
214 ljmp $8, $3f
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
215
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
216 hlt
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
217
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
218 .align 4, 0xFF
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
219 gdt:
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
220 .word gdtEnd - gdtStart
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
221 .long gdtStart
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
222
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
223 .align 4, 0xFF
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
224 idt:
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
225 .word 0x07FF /* Allow space for 256 interrupt vectors. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
226 .long 0
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
227
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
228 gdtStart:
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
229 /* Selector 0x00 == invalid. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
230 .word 0x0000
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
231 .word 0x0000
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
232 .byte 0x00
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
233 .byte 0x00
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
234 .byte 0x00
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
235 .byte 0x00
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
236
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
237 /* Selector 0x08 == code. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
238 .word 0xFFFF
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
239 .word 0x0000
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
240 .byte 0x00
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
241 .byte 0x9B
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
242 .byte 0xCF
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
243 .byte 0x00
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
244
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
245 /* Selector 0x10 == data. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
246 .word 0xFFFF
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
247 .word 0x0000
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
248 .byte 0x00
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
249 .byte 0x93
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
250 .byte 0xCF
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
251 .byte 0x00
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
252
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
253 /* Selector 0x18 == shorter code: faults any code access 0xF0000000-0xFFFFFFFF. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
254 .word 0xFFFF
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
255 .word 0x0000
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
256 .byte 0x00
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
257 .byte 0x9B
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
258 .byte 0xC7
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
259 .byte 0x00
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
260
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
261 /* Selector 0x20 == data; faults any access 0xF0000000-0xFFFFFFFF. */
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
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diff changeset
262 .word 0xFFFF
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
jlarmour
parents:
diff changeset
263 .word 0x0000
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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264 .byte 0x00
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265 .byte 0x93
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266 .byte 0xC7
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267 .byte 0x00
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268
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269 .align 4, 0xFF
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270 gdtEnd:
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271
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272 .code32
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273 3:
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274
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275 movw $0x10, %ax
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276 movw %ax, %ds
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277 movw %ax, %es
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278 movw %ax, %fs
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279 movw %ax, %gs
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280
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281 /* Make our new stack point to the same place as the old one. */
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282 xorl %ebx, %ebx
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283 movw %ss, %bx
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284 shl $4, %ebx
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285 addl %esp, %ebx
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286 movw %ax, %ss
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287 movl %ebx, %esp
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288 movl $0, %ebp
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289
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290 /* Reset the flags register. */
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291 pushl $0
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292 popfl
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293
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294 /* Save the standard and extended memory lengths into some static variables...
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295 I'm predicting that someone is going to break our way of passing a pointer
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296 to this structure... may as well avoid that problem now.
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297 */
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298 .data
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299 .align 4
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300 .globl pc_standard_memory_size
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301 pc_standard_memory_size:
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302 .long 0
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303 .globl pc_extended_memory_size
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304 pc_extended_memory_size:
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305 .long 0
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306 .text
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307 movl 0(%esp), %eax
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308 movl 4(%esp), %ebx
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309 movl %eax, pc_standard_memory_size
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310 movl %ebx, pc_extended_memory_size
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311
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312 /* _pc_entry() takes a pointer to our startup array (which only has standard
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313 and extended memory sizes in it, on the stack).
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314 */
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315 movl %esp, %ebx /* They are the last parameters on the stack. */
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316 pushl %ebx
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317
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318 #endif /* CYG_HAL_STARTUP_FLOPPY */
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319
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320 #ifdef CYG_HAL_STARTUP_RAM
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321
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322 /* In this case, the sizes of memory are pointed to by a pointer in IRQ
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323 vector 15.
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324 */
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325
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326 /* Save the standard and extended memory lengths into some static variables...
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327 */
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328 .data
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329 .align 4
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330 .globl pc_standard_memory_size
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331 pc_standard_memory_size:
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332 .long 0
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333 .globl pc_extended_memory_size
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334 pc_extended_memory_size:
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335 .long 0
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336 .text
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337 movl (15 * 8), %ebp
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338 movl 0(%ebp), %eax
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339 movl 4(%ebp), %ebx
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340 movl %eax, pc_standard_memory_size
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341 movl %ebx, pc_extended_memory_size
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342
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343 #endif /* CYG_HAL_STARTUP_RAM */
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344
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345 .endm /* hal_cpu_init */
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346
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347
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348 ##=============================================================================
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349 ## Interrupt controller support
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350
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351 #define CYGPKG_HAL_I386_INTC_INIT_DEFINED
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352
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353 .macro hal_intc_init
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354
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355 # The interrupt controller is configured so that IRQ levels 0-7 trigger
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356 # interrupt vector 32-39; levels 8-15 trigger 40-47.
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357 movb $0x11, %al
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358 outb %al, $0x20
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359 movb $0x20, %al
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360 outb %al, $0x21
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361 movb $0x04, %al
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362 outb %al, $0x21
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363 movb $0x01, %al
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364 outb %al, $0x21
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365 movb $0xFF, %al /* Mask off all interrupts. */
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366 outb %al, $0x21
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367
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368 movb $0x11, %al
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369 outb %al, $0xA0
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370 movb $0x28, %al
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371 outb %al, $0xA1
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372 movb $0x02, %al
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373 outb %al, $0xA1
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374 movb $0x01, %al
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375 outb %al, $0xA1
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376 movb $0xFF, %al /* Mask off all interrupts. */
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377 outb %al, $0xA1
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378
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379 .endm /* hal_intc_init */
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380
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381 .macro hal_intc_ack vector
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382 # Use any registers you like.
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383 movl \vector, %edx
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384 movb $0x20, %al
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385 cmpl $0x20, %edx
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386 jl 8f
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387 cmpl $0x30, %edx
115
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388 jl 9f
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389 outb %al, $0xA0
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390 9: outb %al, $0x20
76
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391 8: nop
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392 .endm
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393
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394 ##=============================================================================
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395 ## FPU support
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396
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397 #define CYGPKG_HAL_I386_FPU_DEFINED
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398
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399 .macro hal_fpu_init
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400 # Tell the CPU to use the math hardware.
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401 movl %cr0, %eax
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402 orl $0x32, %eax
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403 movl %eax, %cr0
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404
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405 finit # and initialize...
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406
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407 ## Enable floating point exceptions. Bit mask:
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408 ## 1 - invalid operation
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409 ## 2 - denormalized operand
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410 ## 4 - zero divide
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411 ## 8 - overflow
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412 ## 16 - underflow
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413 ## 32 - precision
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414 pushl $0
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415 fstcw 0(%esp)
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416 movl 0(%esp),%eax
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417 andb $(~0x04),%al
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418 movl %eax,0(%esp)
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419 fldcw 0(%esp)
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420 addl $4,%esp
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421
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422 # Tell the CPU to generate a interrupt 7 when the math device is used.
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423 #if 0
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424 movl %cr0, %eax
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425 orl $0x3A, %eax
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426 movl %eax, %cr0
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427 #endif
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428
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429 .endm /* hal_fpu_init */
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430
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431
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432 .macro hal_fpu_save regs
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433 .endm /* hal_fpu_save */
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434
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435 .macro hal_fpu_save_caller regs
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436 .endm /* hal_fpu_save_caller */
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437
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438 .macro hal_fpu_save_callee regs
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439 .endm /* hal_fpu_save_callee */
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440
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441 .macro hal_fpu_load_caller regs
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442 .endm /* hal_fpu_load_caller */
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443
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444 .macro hal_fpu_load_callee regs
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445 .endm /* hal_fpu_load_callee */
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446
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447 .macro hal_fpu_load regs
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448 .endm /* hal_fpu_load */
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449
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450
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451 ##=============================================================================
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452 #endif // ifndef CYGONCE_HAL_PLATFORM_INC
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453 ## end of platform.inc