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