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The LXR Cross Referencer for SOS

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001 /* Copyright (C) 2004  David Decotigny
002 
003    This program is free software; you can redistribute it and/or
004    modify it under the terms of the GNU General Public License
005    as published by the Free Software Foundation; either version 2
006    of the License, or (at your option) any later version.
007    
008    This program is distributed in the hope that it will be useful,
009    but WITHOUT ANY WARRANTY; without even the implied warranty of
010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
011    GNU General Public License for more details.
012    
013    You should have received a copy of the GNU General Public License
014    along with this program; if not, write to the Free Software
015    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
016    USA. 
017 */
018 #ifndef _SOS_HWINTR_H_
019 #define _SOS_HWINTR_H_
020 
021 
022 /**
023  * @file irq.c
024  *
025  * Hardware interrupts routines management.
026  */
027 
028 
029 #include <sos/errno.h>
030 #include "cpu_context.h"
031 
032 
033 #define sos_save_flags(flags) \
034   asm volatile("pushfl ; popl %0":"=g"(flags)::"memory")
035 #define sos_restore_flags(flags) \
036   asm volatile("push %0; popfl"::"g"(flags):"memory")
037 
038 
039 #define sos_disable_IRQs(flags)    \
040   ({ sos_save_flags(flags); asm("cli\n"); })
041 #define sos_restore_IRQs(flags)    \
042   sos_restore_flags(flags)
043 
044 
045 /* Usual IRQ levels */
046 #define SOS_IRQ_TIMER         0
047 #define SOS_IRQ_KEYBOARD      1
048 #define SOS_IRQ_SLAVE_PIC     2
049 #define SOS_IRQ_COM2          3
050 #define SOS_IRQ_COM1          4
051 #define SOS_IRQ_LPT2          5
052 #define SOS_IRQ_FLOPPY        6
053 #define SOS_IRQ_LPT1          7
054 #define SOS_IRQ_8_NOT_DEFINED 8
055 #define SOS_IRQ_RESERVED_1    9
056 #define SOS_IRQ_RESERVED_2    10
057 #define SOS_IRQ_RESERVED_3    11
058 #define SOS_IRQ_RESERVED_4    12
059 #define SOS_IRQ_COPROCESSOR   13
060 #define SOS_IRQ_HARDDISK      14
061 #define SOS_IRQ_RESERVED_5    15
062 
063 
064 /** Definition of an hardware IRQ handler */
065 typedef void (*sos_irq_handler_t)(int irq_level);
066 
067 
068 /** Setup the PIC */
069 sos_ret_t sos_irq_subsystem_setup(void);
070 
071 
072 /**
073  * If the routine is not NULL, the IDT is setup to call an IRQ
074  * wrapper upon interrupt, which in turn will call the routine, and
075  * the PIC is programmed to raise an irq.\ If the routine is
076  * NULL, we disable the irq line.
077  */
078 sos_ret_t sos_irq_set_routine(int irq_level,
079                               sos_irq_handler_t routine);
080 
081 sos_irq_handler_t sos_irq_get_routine(int irq_level);
082 
083 
084 /**
085  * Tell how many nested IRQ handler have been fired
086  */
087 sos_ui32_t sos_irq_get_nested_level();
088 
089 
090 /**
091  * Return TRUE when we are currently executing in interrupt context
092  */
093 #define sos_servicing_irq() \
094   (sos_irq_get_nested_level() > 0)
095 
096 
097 #endif /* _SOS_HWINTR_H_ */

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