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/* Copyright (C) 2004 David Decotigny
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
*/
#ifndef _SOS_HWINTR_H_
#define _SOS_HWINTR_H_
/**
* @file irq.c
*
* Hardware interrupts routines management.
*/
#include <sos/errno.h>
#include "cpu_context.h"
#define sos_save_flags(flags) \
asm volatile("pushfl ; popl %0":"=g"(flags)::"memory")
#define sos_restore_flags(flags) \
asm volatile("push %0; popfl"::"g"(flags):"memory")
#define sos_disable_IRQs(flags) \
({ sos_save_flags(flags); asm("cli\n"); })
#define sos_restore_IRQs(flags) \
sos_restore_flags(flags)
/* Usual IRQ levels */
#define SOS_IRQ_TIMER 0
#define SOS_IRQ_KEYBOARD 1
#define SOS_IRQ_SLAVE_PIC 2
#define SOS_IRQ_COM2 3
#define SOS_IRQ_COM1 4
#define SOS_IRQ_LPT2 5
#define SOS_IRQ_FLOPPY 6
#define SOS_IRQ_LPT1 7
#define SOS_IRQ_8_NOT_DEFINED 8
#define SOS_IRQ_RESERVED_1 9
#define SOS_IRQ_RESERVED_2 10
#define SOS_IRQ_RESERVED_3 11
#define SOS_IRQ_RESERVED_4 12
#define SOS_IRQ_COPROCESSOR 13
#define SOS_IRQ_HARDDISK 14
#define SOS_IRQ_RESERVED_5 15
/** Definition of an hardware IRQ handler */
typedef void (*sos_irq_handler_t)(int irq_level);
/** Setup the PIC */
sos_ret_t sos_irq_subsystem_setup(void);
/**
* If the routine is not NULL, the IDT is setup to call an IRQ
* wrapper upon interrupt, which in turn will call the routine, and
* the PIC is programmed to raise an irq.\ If the routine is
* NULL, we disable the irq line.
*/
sos_ret_t sos_irq_set_routine(int irq_level,
sos_irq_handler_t routine);
sos_irq_handler_t sos_irq_get_routine(int irq_level);
/**
* Tell how many nested IRQ handler have been fired
*/
sos_ui32_t sos_irq_get_nested_level();
/**
* Return TRUE when we are currently executing in interrupt context
*/
#define sos_servicing_irq() \
(sos_irq_get_nested_level() > 0)
#endif /* _SOS_HWINTR_H_ */
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