98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/* Copyright (C) 2004 David Decotigny
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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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#ifndef _SOS_HWINTR_H_
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#define _SOS_HWINTR_H_
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/**
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* @file irq.c
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*
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* Hardware interrupts routines management.
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*/
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#include <sos/errno.h>
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#include "cpu_context.h"
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#define sos_save_flags(flags) \
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asm volatile("pushfl ; popl %0":"=g"(flags)::"memory")
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#define sos_restore_flags(flags) \
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asm volatile("push %0; popfl"::"g"(flags):"memory")
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#define sos_disable_IRQs(flags) \
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({ sos_save_flags(flags); asm("cli\n"); })
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#define sos_restore_IRQs(flags) \
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sos_restore_flags(flags)
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/* Usual IRQ levels */
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#define SOS_IRQ_TIMER 0
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#define SOS_IRQ_KEYBOARD 1
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#define SOS_IRQ_SLAVE_PIC 2
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#define SOS_IRQ_COM2 3
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#define SOS_IRQ_COM1 4
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#define SOS_IRQ_LPT2 5
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#define SOS_IRQ_FLOPPY 6
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#define SOS_IRQ_LPT1 7
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#define SOS_IRQ_8_NOT_DEFINED 8
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#define SOS_IRQ_RESERVED_1 9
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#define SOS_IRQ_RESERVED_2 10
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#define SOS_IRQ_RESERVED_3 11
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#define SOS_IRQ_RESERVED_4 12
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#define SOS_IRQ_COPROCESSOR 13
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#define SOS_IRQ_HARDDISK 14
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#define SOS_IRQ_RESERVED_5 15
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/** Definition of an hardware IRQ handler */
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typedef void (*sos_irq_handler_t)(int irq_level);
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/** Setup the PIC */
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sos_ret_t sos_irq_subsystem_setup(void);
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/**
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* If the routine is not NULL, the IDT is setup to call an IRQ
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* wrapper upon interrupt, which in turn will call the routine, and
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* the PIC is programmed to raise an irq.\ If the routine is
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* NULL, we disable the irq line.
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*/
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sos_ret_t sos_irq_set_routine(int irq_level,
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sos_irq_handler_t routine);
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sos_irq_handler_t sos_irq_get_routine(int irq_level);
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/**
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* Tell how many nested IRQ handler have been fired
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*/
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sos_ui32_t sos_irq_get_nested_level(void);
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/**
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* Return TRUE when we are currently executing in interrupt context
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*/
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#define sos_servicing_irq() \
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(sos_irq_get_nested_level() > 0)
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#endif /* _SOS_HWINTR_H_ */
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