93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/* Copyright (C) 2004 David Decotigny
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Copyright (C) 1999 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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USA.
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*/
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#include "idt.h"
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#include "irq.h"
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#include "exception.h"
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/* array of exception wrappers, defined in exception_wrappers.S */
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extern sos_vaddr_t sos_exception_wrapper_array[SOS_EXCEPT_NUM];
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/* arrays of exception handlers, shared with exception_wrappers.S */
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sos_exception_handler_t sos_exception_handler_array[SOS_EXCEPT_NUM] =
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{ NULL, };
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sos_ret_t sos_exceptions_setup(void)
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{
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/* We inidicate that the double fault exception handler is defined,
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and give its address. this handler is a do-nothing handler (see
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exception_wrappers.S), and it can NOT be overriden by the
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functions below */
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return sos_idt_set_handler(SOS_EXCEPT_BASE + SOS_EXCEPT_DOUBLE_FAULT,
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(sos_vaddr_t) sos_exception_wrapper_array[SOS_EXCEPT_DOUBLE_FAULT],
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0 /* CPL0 routine */);
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}
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sos_ret_t sos_exception_set_routine(int exception_number,
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sos_exception_handler_t routine)
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{
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sos_ret_t retval;
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sos_ui32_t flags;
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if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM))
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return -SOS_EINVAL;
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/* Double fault not supported */
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if (exception_number == SOS_EXCEPT_DOUBLE_FAULT)
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return -SOS_ENOSUP;
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sos_disable_IRQs(flags);
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retval = SOS_OK;
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/* Set the exception routine to be called by the exception wrapper */
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sos_exception_handler_array[exception_number] = routine;
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/* If the exception is to be enabled, update the IDT with the exception
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wrapper */
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if (routine != NULL)
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retval
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= sos_idt_set_handler(SOS_EXCEPT_BASE + exception_number,
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(sos_vaddr_t) sos_exception_wrapper_array[exception_number],
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0 /* CPL0 routine */);
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else /* Disable the IDT entry */
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retval
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= sos_idt_set_handler(SOS_EXCEPT_BASE + exception_number,
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(sos_vaddr_t)NULL /* No routine => disable IDTE */,
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0 /* don't care */);
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sos_restore_IRQs(flags);
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return retval;
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}
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sos_exception_handler_t sos_exception_get_routine(int exception_number)
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{
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if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM))
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return NULL;
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/* Double fault not supported */
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if (exception_number == SOS_EXCEPT_DOUBLE_FAULT)
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return NULL;
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/* Expected to be atomic */
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return sos_exception_handler_array[exception_number];
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}
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