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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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