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001 /* Copyright (C) 2004 David Decotigny 002 Copyright (C) 1999 Free Software Foundation, Inc. 003 004 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any later version. 008 009 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details. 013 014 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 018 */ 019 #ifndef _SOS_HWINTR_H_ 020 #define _SOS_HWINTR_H_ 021 022 023 /** 024 * @file irq.c 025 * 026 * Hardware interrupts routines management. 027 */ 028 029 030 #include <sos/errno.h> 031 #include "cpu_context.h" 032 033 034 #define sos_save_flags(flags) \ 035 asm volatile("pushfl ; popl %0":"=g"(flags)::"memory") 036 #define sos_restore_flags(flags) \ 037 asm volatile("push %0; popfl"::"g"(flags):"memory") 038 039 040 #define sos_disable_IRQs(flags) \ 041 ({ sos_save_flags(flags); asm("cli\n"); }) 042 #define sos_restore_IRQs(flags) \ 043 sos_restore_flags(flags) 044 045 046 /* Usual IRQ levels */ 047 #define SOS_IRQ_TIMER 0 048 #define SOS_IRQ_KEYBOARD 1 049 #define SOS_IRQ_SLAVE_PIC 2 050 #define SOS_IRQ_COM2 3 051 #define SOS_IRQ_COM1 4 052 #define SOS_IRQ_LPT2 5 053 #define SOS_IRQ_FLOPPY 6 054 #define SOS_IRQ_LPT1 7 055 #define SOS_IRQ_8_NOT_DEFINED 8 056 #define SOS_IRQ_RESERVED_1 9 057 #define SOS_IRQ_RESERVED_2 10 058 #define SOS_IRQ_RESERVED_3 11 059 #define SOS_IRQ_RESERVED_4 12 060 #define SOS_IRQ_COPROCESSOR 13 061 #define SOS_IRQ_HARDDISK 14 062 #define SOS_IRQ_RESERVED_5 15 063 064 065 /** Definition of an hardware IRQ handler */ 066 typedef void (*sos_irq_handler_t)(int irq_level, 067 const struct sos_cpu_kstate *cpu_kstate); 068 069 070 /** Setup the PIC */ 071 sos_ret_t sos_irq_subsystem_setup(void); 072 073 074 /** 075 * If the routine is not NULL, the IDT is setup to call an IRQ 076 * wrapper upon interrupt, which in turn will call the routine, and 077 * the PIC is programmed to raise an irq.\ If the routine is 078 * NULL, we disable the irq line. 079 */ 080 sos_ret_t sos_irq_set_routine(int irq_level, 081 sos_irq_handler_t routine); 082 083 sos_irq_handler_t sos_irq_get_routine(int irq_level); 084 085 086 /** 087 * Tell how many nested IRQ handler have been fired 088 */ 089 sos_ui32_t sos_irq_get_nested_level(); 090 091 092 /** 093 * Return TRUE when we are currently executing in interrupt context 094 */ 095 #define sos_servicing_irq() \ 096 (sos_irq_get_nested_level() > 0) 097 098 099 #endif /* _SOS_HWINTR_H_ */
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