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001 /* Copyright (C) 2004 The KOS Team 001 /* Copyright (C) 2004 The KOS Team >> 002 Copyright (C) 1999 Free Software Foundation, Inc. 002 003 003 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 007 008 008 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 012 GNU General Public License for more details. 012 013 013 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 017 USA. 017 */ 018 */ 018 !! 019 #define ASM_SOURCE 1 019 #include "segment.h" << 020 020 021 .file "irq_wrappers.S" 021 .file "irq_wrappers.S" 022 022 023 .text 023 .text 024 024 025 /** The address of the table of handlers (defi !! 025 /* The address of the table of handlers (defined in irq.c) */ 026 .extern sos_irq_handler_array 026 .extern sos_irq_handler_array 027 027 028 /** The address of the table of wrappers (defi !! 028 /* The address of the table of wrappers (defined below, and shared 029 with irq.c */ 029 with irq.c */ 030 .globl sos_irq_wrapper_array 030 .globl sos_irq_wrapper_array 031 031 032 /** The variable holding the nested level of t << 033 .extern sos_irq_nested_level_counter << 034 << 035 /** Update the interrupted current thread's CP << 036 Its prototype is: << 037 sos_thread_prepare_irq_servicing(struct << 038 */ << 039 .extern sos_thread_prepare_irq_servicing << 040 << 041 /** Update the kernel TSS in case we are switc << 042 mode in order to come back into the co << 043 .extern sos_cpu_context_update_kernel_tss << 044 << 045 /** Select a thread to set on CPU (this enable << 046 preemption) and configure the MMU to match << 047 thread. << 048 Its prototype is: << 049 struct sos_cpu_state * // Selected CPU c << 050 sos_thread_prepare_irq_switch_back(); << 051 */ << 052 .extern sos_thread_prepare_irq_switch_back << 053 032 054 /* These pre-handlers are for IRQ (Master PIC) 033 /* These pre-handlers are for IRQ (Master PIC) */ 055 .irp id, 0,1,2,3,4,5,6,7 034 .irp id, 0,1,2,3,4,5,6,7 056 035 057 .p2align 2, 0x90 036 .p2align 2, 0x90 058 037 059 sos_irq_wrapper_\id: 038 sos_irq_wrapper_\id: 060 .type sos_irq_wrapper_\id,@function 039 .type sos_irq_wrapper_\id,@function 061 040 062 /* 041 /* 063 * Backup the CPU context 042 * Backup the CPU context 064 */ 043 */ 065 044 066 /* Fake error code */ 045 /* Fake error code */ 067 pushl $0 046 pushl $0 068 047 069 /* Backup the actual context * 048 /* Backup the actual context */ 070 pushl %ebp 049 pushl %ebp 071 movl %esp, %ebp 050 movl %esp, %ebp 072 051 073 pushl %edi 052 pushl %edi 074 pushl %esi 053 pushl %esi 075 pushl %edx 054 pushl %edx 076 pushl %ecx 055 pushl %ecx 077 pushl %ebx 056 pushl %ebx 078 pushl %eax 057 pushl %eax 079 subl $2,%esp 058 subl $2,%esp 080 pushw %ss 059 pushw %ss 081 pushw %ds 060 pushw %ds 082 pushw %es 061 pushw %es 083 pushw %fs 062 pushw %fs 084 pushw %gs 063 pushw %gs 085 064 086 /* Set correct kernel segment << 087 movw $SOS_BUILD_SEGMENT_REG_VA << 088 pushw %di ; popw %ds << 089 pushw %di ; popw %es << 090 pushw %di ; popw %fs << 091 pushw %di ; popw %gs << 092 << 093 /* << 094 * Increment IRQ nested level << 095 */ << 096 incl sos_irq_nested_level_coun << 097 /* Outermost IRQ only: store t << 098 of the current thread */ << 099 cmpl $1, sos_irq_nested_level_ << 100 jne 1f << 101 pushl %esp << 102 call sos_thread_prepare_irq_se << 103 addl $4, %esp << 104 << 105 1: << 106 << 107 /* Send EOI to PIC. See Intel 065 /* Send EOI to PIC. See Intel 8259 datasheet 108 available on Kos website */ 066 available on Kos website */ 109 movb $0x20, %al 067 movb $0x20, %al 110 outb %al, $0x20 068 outb %al, $0x20 111 069 112 /* 070 /* 113 * Call the handler with IRQ n 071 * Call the handler with IRQ number as argument 114 */ 072 */ 115 pushl $\id 073 pushl $\id 116 leal sos_irq_handler_array,%e 074 leal sos_irq_handler_array,%edi 117 call *\id*4(%edi) 075 call *\id*4(%edi) 118 addl $4, %esp 076 addl $4, %esp 119 << 120 /* << 121 * Decrement IRQ nested level << 122 */ << 123 cli /* Just in case we messed << 124 subl $1, sos_irq_nested_level_ << 125 077 126 /* sos_irq_nested_level_counte << 127 jnc 2f << 128 << 129 1: /* Yes: Print fatal error mess << 130 pushl $msg_nested_level_overfl << 131 call sos_display_fatal_error << 132 addl $4, %esp ; jmp 1b << 133 /* Never returns */ << 134 << 135 2: /* No: all right ! */ << 136 << 137 /* Was this the outermost IRQ << 138 jnz 3f << 139 << 140 /* Yes: reschedule */ << 141 call sos_thread_prepare_irq_sw << 142 /* Establish new context: cont << 143 movl %eax, %esp << 144 << 145 /* Prepare kernel TSS in case << 146 user thread: we make sure t << 147 into the kernel at a correc << 148 pushl %esp /* Pass the locatio << 149 restoring to the << 150 call sos_cpu_context_update_ke << 151 addl $4, %esp << 152 3: << 153 /* Restore the context */ 078 /* Restore the context */ 154 popw %gs 079 popw %gs 155 popw %fs 080 popw %fs 156 popw %es 081 popw %es 157 popw %ds 082 popw %ds 158 popw %ss 083 popw %ss 159 addl $2,%esp 084 addl $2,%esp 160 popl %eax 085 popl %eax 161 popl %ebx 086 popl %ebx 162 popl %ecx 087 popl %ecx 163 popl %edx 088 popl %edx 164 popl %esi 089 popl %esi 165 popl %edi 090 popl %edi 166 popl %ebp 091 popl %ebp 167 092 168 /* Remove fake error code */ 093 /* Remove fake error code */ 169 addl $4, %esp 094 addl $4, %esp 170 095 171 iret 096 iret 172 .endr 097 .endr 173 098 174 099 175 /* These pre-handlers are for IRQ (Slave PIC) 100 /* These pre-handlers are for IRQ (Slave PIC) */ 176 .irp id, 8,9,10,11,12,13,14,15 101 .irp id, 8,9,10,11,12,13,14,15 177 102 178 .p2align 2, 0x90 103 .p2align 2, 0x90 179 104 180 sos_irq_wrapper_\id: 105 sos_irq_wrapper_\id: 181 .type sos_irq_wrapper_\id,@function 106 .type sos_irq_wrapper_\id,@function 182 107 183 /* 108 /* 184 * Backup the CPU context 109 * Backup the CPU context 185 */ 110 */ 186 111 187 /* Fake error code */ 112 /* Fake error code */ 188 pushl $0 113 pushl $0 189 114 190 /* Backup the actual context * 115 /* Backup the actual context */ 191 pushl %ebp 116 pushl %ebp 192 movl %esp, %ebp 117 movl %esp, %ebp 193 118 194 pushl %edi 119 pushl %edi 195 pushl %esi 120 pushl %esi 196 pushl %edx 121 pushl %edx 197 pushl %ecx 122 pushl %ecx 198 pushl %ebx 123 pushl %ebx 199 pushl %eax 124 pushl %eax 200 subl $2,%esp 125 subl $2,%esp 201 pushw %ss 126 pushw %ss 202 pushw %ds 127 pushw %ds 203 pushw %es 128 pushw %es 204 pushw %fs 129 pushw %fs 205 pushw %gs 130 pushw %gs 206 131 207 /* Set correct kernel segment << 208 movw $SOS_BUILD_SEGMENT_REG_VA << 209 pushw %di ; popw %ds << 210 pushw %di ; popw %es << 211 pushw %di ; popw %fs << 212 pushw %di ; popw %gs << 213 << 214 /* << 215 * Increment IRQ nested level << 216 */ << 217 incl sos_irq_nested_level_coun << 218 /* Outermost IRQ only: store t << 219 of the current thread */ << 220 cmpl $1, sos_irq_nested_level_ << 221 jne 1f << 222 pushl %esp << 223 call sos_thread_prepare_irq_se << 224 addl $4, %esp << 225 << 226 1: << 227 << 228 /* Send EOI to PIC. See Intel 132 /* Send EOI to PIC. See Intel 8259 datasheet 229 available on Kos website */ 133 available on Kos website */ 230 movb $0x20, %al 134 movb $0x20, %al 231 outb %al, $0xa0 135 outb %al, $0xa0 232 outb %al, $0x20 136 outb %al, $0x20 233 137 234 /* 138 /* 235 * Call the handler with IRQ n 139 * Call the handler with IRQ number as argument 236 */ 140 */ 237 pushl $\id 141 pushl $\id 238 leal sos_irq_handler_array,%e 142 leal sos_irq_handler_array,%edi 239 call *\id*4(%edi) 143 call *\id*4(%edi) 240 addl $4, %esp 144 addl $4, %esp 241 145 242 /* << 243 * Decrement IRQ nested level << 244 */ << 245 cli /* Just in case we messed << 246 subl $1, sos_irq_nested_level_ << 247 << 248 /* sos_irq_nested_level_counte << 249 jnc 2f << 250 << 251 1: /* Yes: Print fatal error mess << 252 pushl $msg_nested_level_overfl << 253 call sos_display_fatal_error << 254 addl $4, %esp ; jmp 1b << 255 /* Never returns */ << 256 << 257 2: /* No: all right ! */ << 258 << 259 /* Was this the outermost IRQ << 260 jnz 3f << 261 << 262 /* Yes: reschedule */ << 263 call sos_thread_prepare_irq_sw << 264 /* Establish new context: cont << 265 movl %eax, %esp << 266 << 267 /* Prepare kernel TSS in case << 268 user thread: we make sure t << 269 into the kernel at a correc << 270 pushl %esp /* Pass the locatio << 271 restoring to the << 272 call sos_cpu_context_update_ke << 273 addl $4, %esp << 274 3: << 275 /* Restore the context */ 146 /* Restore the context */ 276 popw %gs 147 popw %gs 277 popw %fs 148 popw %fs 278 popw %es 149 popw %es 279 popw %ds 150 popw %ds 280 popw %ss 151 popw %ss 281 addl $2,%esp 152 addl $2,%esp 282 popl %eax 153 popl %eax 283 popl %ebx 154 popl %ebx 284 popl %ecx 155 popl %ecx 285 popl %edx 156 popl %edx 286 popl %esi 157 popl %esi 287 popl %edi 158 popl %edi 288 popl %ebp 159 popl %ebp 289 160 290 /* Remove fake error code */ 161 /* Remove fake error code */ 291 addl $4, %esp 162 addl $4, %esp 292 163 293 iret 164 iret 294 .endr 165 .endr 295 166 296 .section ".rodata" << 297 msg_nested_level_overflow: << 298 .string "irq_wrappers.S: IRQ Nested le << 299 << 300 /* Build the sos_irq_wrapper_array, shared wit 167 /* Build the sos_irq_wrapper_array, shared with irq.c */ >> 168 .section ".rodata" 301 .p2align 5, 0x0 169 .p2align 5, 0x0 302 sos_irq_wrapper_array: 170 sos_irq_wrapper_array: 303 .irp id, 0,1,2,3,4,5,6,7,8,9,10,11,12, 171 .irp id, 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 304 .long (sos_irq_wrapper_\id) 172 .long (sos_irq_wrapper_\id) 305 .endr 173 .endr
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