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001 /* Copyright (C) 2004 David Decotigny 001 /* Copyright (C) 2004 David Decotigny 002 Copyright (C) 1999 Free Software Foundatio 002 Copyright (C) 1999 Free Software Foundation, Inc. 003 003 004 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 008 008 009 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 012 GNU General Public License for more details. 013 013 014 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 017 USA. 018 */ 018 */ 019 #include "idt.h" 019 #include "idt.h" 020 #include "irq.h" 020 #include "irq.h" 021 021 022 #include "exception.h" 022 #include "exception.h" 023 023 024 /* array of exception wrappers, defined in exc 024 /* array of exception wrappers, defined in exception_wrappers.S */ 025 extern sos_vaddr_t sos_exception_wrapper_array 025 extern sos_vaddr_t sos_exception_wrapper_array[SOS_EXCEPT_NUM]; 026 026 027 /* arrays of exception handlers, shared with e 027 /* arrays of exception handlers, shared with exception_wrappers.S */ 028 sos_exception_handler_t sos_exception_handler_ 028 sos_exception_handler_t sos_exception_handler_array[SOS_EXCEPT_NUM] = 029 { NULL, }; 029 { NULL, }; 030 030 031 sos_ret_t sos_exception_subsystem_setup(void) !! 031 sos_ret_t sos_exceptions_setup(void) 032 { 032 { 033 /* We inidicate that the double fault except !! 033 return SOS_OK; 034 and give its address. this handler is a d << 035 exception_wrappers.S), and it can NOT be << 036 functions below */ << 037 return sos_idt_set_handler(SOS_EXCEPT_BASE + << 038 (sos_vaddr_t) sos_ << 039 0 /* CPL0 routine << 040 } 034 } 041 035 042 036 043 sos_ret_t sos_exception_set_routine(int except 037 sos_ret_t sos_exception_set_routine(int exception_number, 044 sos_except 038 sos_exception_handler_t routine) 045 { 039 { 046 sos_ret_t retval; 040 sos_ret_t retval; 047 sos_ui32_t flags; 041 sos_ui32_t flags; 048 042 049 if ((exception_number < 0) || (exception_num 043 if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM)) 050 return -SOS_EINVAL; 044 return -SOS_EINVAL; 051 045 052 /* Double fault not supported */ 046 /* Double fault not supported */ 053 if (exception_number == SOS_EXCEPT_DOUBLE_FA 047 if (exception_number == SOS_EXCEPT_DOUBLE_FAULT) 054 return -SOS_ENOSUP; 048 return -SOS_ENOSUP; 055 049 056 sos_disable_IRQs(flags); 050 sos_disable_IRQs(flags); 057 051 058 retval = SOS_OK; 052 retval = SOS_OK; 059 053 060 /* Set the exception routine to be called by 054 /* Set the exception routine to be called by the exception wrapper */ 061 sos_exception_handler_array[exception_number 055 sos_exception_handler_array[exception_number] = routine; 062 056 063 /* If the exception is to be enabled, update 057 /* If the exception is to be enabled, update the IDT with the exception 064 wrapper */ 058 wrapper */ 065 if (routine != NULL) 059 if (routine != NULL) 066 retval 060 retval 067 = sos_idt_set_handler(SOS_EXCEPT_BASE + 061 = sos_idt_set_handler(SOS_EXCEPT_BASE + exception_number, 068 (sos_vaddr_t) sos_ 062 (sos_vaddr_t) sos_exception_wrapper_array[exception_number], 069 0 /* CPL0 routine 063 0 /* CPL0 routine */); 070 else /* Disable the IDT entry */ 064 else /* Disable the IDT entry */ 071 retval 065 retval 072 = sos_idt_set_handler(SOS_EXCEPT_BASE + 066 = sos_idt_set_handler(SOS_EXCEPT_BASE + exception_number, 073 (sos_vaddr_t)NULL 067 (sos_vaddr_t)NULL /* No routine => disable IDTE */, 074 0 /* don't care */ 068 0 /* don't care */); 075 069 076 sos_restore_IRQs(flags); 070 sos_restore_IRQs(flags); 077 return retval; 071 return retval; 078 } 072 } 079 073 080 074 081 sos_exception_handler_t sos_exception_get_rout 075 sos_exception_handler_t sos_exception_get_routine(int exception_number) 082 { 076 { 083 if ((exception_number < 0) || (exception_num 077 if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM)) 084 return NULL; 078 return NULL; 085 079 086 /* Double fault not supported */ 080 /* Double fault not supported */ 087 if (exception_number == SOS_EXCEPT_DOUBLE_FA 081 if (exception_number == SOS_EXCEPT_DOUBLE_FAULT) 088 return NULL; 082 return NULL; 089 083 090 /* Expected to be atomic */ 084 /* Expected to be atomic */ 091 return sos_exception_handler_array[exception 085 return sos_exception_handler_array[exception_number]; 092 } 086 }
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