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annotate packages/hal/i386/pc/current/src/plf_misc.c @ 76:435cced73e2f ecos-v1_3_1-release

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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
author jlarmour
date Tue, 28 Mar 2000 14:10:45 +0000
parents
children 6b5f480c6929
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435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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1 //==========================================================================
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2 //
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3 // plf_misc.c
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4 //
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5 // HAL platform miscellaneous functions
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): nickg
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35 // Contributors: nickg, jlarmour, pjo
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36 // Date: 1999-01-21
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37 // Purpose: HAL miscellaneous functions
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38 // Description: This file contains miscellaneous functions provided by the
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39 // HAL.
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //========================================================================*/
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44
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45 #include <pkgconf/hal.h>
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46
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47 #include <cyg/infra/cyg_type.h> // Base types
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48 #include <cyg/infra/cyg_trac.h> // tracing macros
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49 #include <cyg/infra/cyg_ass.h> // assertion macros
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50
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51 #include <cyg/hal/hal_arch.h> // architectural definitions
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52
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53 #include <cyg/hal/hal_intr.h> // Interrupt handling
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54
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55 #include <cyg/hal/hal_cache.h> // Cache handling
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56
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57 #include <cyg/hal/plf_misc.h>
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58
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59 #ifdef CYGPKG_KERNEL
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60 #include <pkgconf/kernel.h>
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61 #include <cyg/kernel/ktypes.h>
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62 #include <cyg/kernel/kapi.h>
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63 #endif /* CYGPKG_KERNEL */
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64
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65 /*------------------------------------------------------------------------*/
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66
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67 extern void patch_dbg_syscalls(void * vector);
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68
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69 /*------------------------------------------------------------------------*/
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70 /* Floating point context switch support. */
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71 /* NOTE: This code makes use of kernel API calls, which it should not do.*/
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72 /* We need to rewrite this to make use of only HAL supplied facilites, */
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73 /* this may require the addition of some extra HAL level support. */
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74
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75 #if !defined(CYGSEM_HAL_ROM_MONITOR)
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76
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77 volatile int hal_pc_fpe_interrupts = 0 ;
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78 volatile int hal_pc_fpe_switches = 0 ;
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79 volatile cyg_uint32 hal_pc_fpe_owner = 0 ;
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80
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81 cyg_uint32 hal_pc_fpe_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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82 {
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83 return 2 ;
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84 }
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85
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86 void hal_pc_fpe_dsr(CYG_ADDRWORD vector, cyg_ucount32 count, CYG_ADDRWORD data)
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87 {
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88 cyg_handle_t me ;
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89 CYG_ADDRWORD stack ;
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90 cyg_uint32 * p ;
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91
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92 hal_pc_fpe_interrupts++ ;
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93
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94 /* Gotta turn that darn interrupt off! Otherwise we're in a loop! */
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95 asm("movl %%cr0, %%eax\n"
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96 "andl $0xFFFFFFF7, %%eax\n"
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97 "movl %%eax, %%cr0\n"
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98 : /* No outputs. */
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99 : /* No inputs. */
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100 : "eax"
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101 );
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102
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103 me = cyg_thread_self() ;
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104
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105 if (hal_pc_fpe_owner != me)
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106 {
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107 if (hal_pc_fpe_owner)
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108 { /* Then save his state at the bottom of his stack. */
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109 stack = cyg_thread_get_stack_base(hal_pc_fpe_owner) ;
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110 p = (cyg_uint32*) stack ;
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111 stack = (cyg_addrword_t) &(p[1]);
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112 asm("movl %0, %%eax
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113 fsave (%%eax)"
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114 : /* No outputs. */
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115 : "g" (stack)
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116 : "eax") ;
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117 p[0] = 0xCAFEBABE ;
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118 }
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119 hal_pc_fpe_owner = me ;
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120 stack = cyg_thread_get_stack_base(hal_pc_fpe_owner) ;
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121 p = (cyg_uint32*) stack ;
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122 if (p[0] == 0xCAFEBABE)
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123 {
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124 stack = (cyg_addrword_t) &(p[1]) ;
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125 asm("movl %0, %%eax\n"
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126 "frstor (%%eax)\n"
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127 : /* No outputs. */
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128 : "g" (stack)
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129 : "eax");
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130 }
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131
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132 hal_pc_fpe_switches++ ;
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133 }
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134 }
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135
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136
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137 cyg_interrupt hal_pc_fpe_interrupt_object ;
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138 cyg_handle_t hal_pc_fpe_interrupt ;
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139
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140 #endif
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141
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142 /*------------------------------------------------------------------------*/
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143
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144 void hal_platform_init(void)
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145 {
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146
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147 HAL_ICACHE_INVALIDATE_ALL();
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148 HAL_ICACHE_ENABLE();
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149 HAL_DCACHE_INVALIDATE_ALL();
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150 HAL_DCACHE_ENABLE();
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151
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152 #if defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT)
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153 {
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154 void hal_ctrlc_isr_init(void);
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155 hal_ctrlc_isr_init();
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156 }
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157
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158 #endif
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159
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160 #if defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && \
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161 defined(CYG_HAL_USE_ROM_MONITOR) && \
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162 defined(CYG_HAL_USE_ROM_MONITOR_CYGMON)
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163 {
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164 patch_dbg_syscalls( (void *)(&hal_vsr_table[0]) );
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165 }
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166 #endif
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167
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168 #if !defined(CYGSEM_HAL_ROM_MONITOR)
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169 /* Connect to the floating point interrupt. */
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170 cyg_interrupt_create(CYGNUM_HAL_VECTOR_NO_DEVICE, 1, 0,
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171 hal_pc_fpe_isr, hal_pc_fpe_dsr,
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172 &hal_pc_fpe_interrupt, &hal_pc_fpe_interrupt_object);
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173 cyg_interrupt_attach(hal_pc_fpe_interrupt);
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174 #endif
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175
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176 }
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177
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178 /*------------------------------------------------------------------------*/
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179
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180 void hal_pc_reset(void)
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181 {
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182 /* Use Intel's IDT triple-fault trick. */
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183 asm("movl $badIdt, %eax\n"
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184 "lidt (%eax)\n"
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185 "int $3\n"
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186 "hlt\n"
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187
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188 ".align 4\n"
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189
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190 "badIdt:\n"
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191 ".word 0\n"
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192 ".long 0\n"
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193 ) ;
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194 }
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195
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196
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197 /*------------------------------------------------------------------------*/
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198 /* End of plf_misc.c */