diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/go32/startup/setvec.c')
| -rw-r--r-- | c/src/lib/libbsp/i386/go32/startup/setvec.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/i386/go32/startup/setvec.c b/c/src/lib/libbsp/i386/go32/startup/setvec.c new file mode 100644 index 0000000000..42ed99ca3c --- /dev/null +++ b/c/src/lib/libbsp/i386/go32/startup/setvec.c @@ -0,0 +1,67 @@ +/* set_vector + * + * This routine installs an interrupt vector under go32. + * + * INPUT: + * handler - interrupt handler entry point + * vector - vector number + * type - 0 indicates raw hardware connect + * 1 indicates RTEMS interrupt connect + * + * RETURNS: + * address of previous interrupt handler + * + * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. + * On-Line Applications Research Corporation (OAR). + * All rights assigned to U.S. Government, 1994. + * + * This material may be reproduced by or for the U.S. Government pursuant + * to the copyright license under the clause at DFARS 252.227-7013. This + * notice must appear in all copies of this file and its derivatives. + * + * $Id$ + */ + +#include <rtems.h> +#include <bsp.h> + +#include <dpmi.h> +#include <go32.h> + +i386_isr set_vector( /* returns old vector */ + rtems_isr_entry handler, /* isr routine */ + rtems_vector_number vector, /* vector number */ + int type /* RTEMS or RAW intr */ +) +{ + i386_isr previous_isr; + + if ( type ) { + rtems_interrupt_catch( handler, vector, + (rtems_isr_entry *) &previous_isr ); + } else { + /* Interrupt goes straight to the supplied ISR. This code is */ + /* slightly different than that in _CPU_ISR_install_vector */ + /* (which is eventually called by the above) in that this code */ + /* returns the raw entry point as the old handler, while the */ + /* other version returns the old entry point pointed at by the */ + /* rtems ISR table. */ + _go32_dpmi_seginfo handler_info; + + /* get the address of the old handler */ + _go32_dpmi_get_protected_mode_interrupt_vector( vector, &handler_info); + + /* Notice how we're failing to save the pm_segment portion of the */ + /* structure here? That means we might crash the system if we */ + /* try to restore the ISR. Can't fix this until i386_isr is */ + /* redefined. XXX [BHC]. */ + previous_isr = (i386_isr) handler_info.pm_offset; + + /* install the IDT entry */ + handler_info.pm_offset = (int)handler; + handler_info.pm_selector = _go32_my_cs(); + _go32_dpmi_set_protected_mode_interrupt_vector( vector, &handler_info); + } + return previous_isr; +} + |