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author | Alex AUVOLAT <alex.auvolat@ens.fr> | 2014-03-28 09:44:01 +0100 |
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committer | Alex AUVOLAT <alex.auvolat@ens.fr> | 2014-03-28 09:44:01 +0100 |
commit | bdce62a91076aa1a076d484ce1d8564a8ba0988f (patch) | |
tree | 27fae66616a07caaa18fbbf7ce1c39d91fea6d29 /sos-code-article6/hwcore/irq.h | |
parent | b5dc9d799f8eca793a4fd1d9b5111155ae6af6d8 (diff) | |
download | SOS-bdce62a91076aa1a076d484ce1d8564a8ba0988f.tar.gz SOS-bdce62a91076aa1a076d484ce1d8564a8ba0988f.zip |
Import article 5, does not compile.
Diffstat (limited to 'sos-code-article6/hwcore/irq.h')
-rw-r--r-- | sos-code-article6/hwcore/irq.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/sos-code-article6/hwcore/irq.h b/sos-code-article6/hwcore/irq.h new file mode 100644 index 0000000..c067cc4 --- /dev/null +++ b/sos-code-article6/hwcore/irq.h @@ -0,0 +1,97 @@ +/* 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_ */ |