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135 lines
2.9 KiB
135 lines
2.9 KiB
/*[
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c_xtrn.c
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LOCAL CHAR SccsID[]="@(#)c_xtrn.c 1.9 04/22/94";
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Interface routines used by BIOS code.
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-------------------------------------
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]*/
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#include <insignia.h>
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#include <host_def.h>
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#include <stdio.h>
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#include <setjmp.h>
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#include <xt.h>
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#if 0
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#include <sas.h>
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#endif
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#include <c_main.h>
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#include <c_addr.h>
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#include <c_bsic.h>
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#include <c_prot.h>
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#include <c_seg.h>
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#include <c_stack.h>
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#include <c_xcptn.h>
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#include <c_reg.h>
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#include <c_xtrn.h>
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#include <c_mem.h>
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LOCAL jmp_buf interface_abort;
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LOCAL BOOL interface_active;
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LOCAL ISM32 interface_error;
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/*
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=====================================================================
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EXTERNAL ROUTINES START HERE.
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=====================================================================
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*/
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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/* Call CPU Function and catch any resulting exception. */
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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GLOBAL ISM32
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call_cpu_function IFN4(CALL_CPU *, func, ISM32, type, ISM32, arg1, IU16, arg2)
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{
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if ( setjmp(interface_abort) == 0 )
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{
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interface_active = TRUE;
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/* Do the CPU Function */
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switch ( type )
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{
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case 1:
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(*(CALL_CPU_2 *)func)(arg1, arg2);
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break;
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case 2:
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(*(CALL_CPU_1 *)func)(arg2);
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break;
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default:
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break;
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}
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interface_error = 0; /* All went OK */
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}
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interface_active = FALSE;
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return interface_error;
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}
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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/* Check if external interface is active. */
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/* And Bail Out if it is! */
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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GLOBAL VOID
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check_interface_active
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IFN1(
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ISM32, except_nmbr
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)
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{
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if ( interface_active )
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{
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/* YES CPU Function was called by an interface routine. */
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interface_error = except_nmbr; /* save error */
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longjmp(interface_abort, 1); /* Bail Out */
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}
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}
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/*(
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*========================= Cpu_find_dcache_entry ==============================
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* Cpu_find_dcache_entry
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*
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* Purpose
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* In an assembler CPU, this function allows non-CPU code to try and look
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* up a selector in the dcache, rather than constructing it from memory.
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* We don't have a dcache, but it gives us a chance to intercept
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* CS selector calls, as the CS descriptor may not be available.
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*
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* Input
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* selector, The selector to look-up
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*
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* Outputs
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* returns TRUE if selector found (i.e. CS in our case)
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* base The linear address of the base of the segment.
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*
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* Description
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* Just look out for CS, and return the stored base if we get it.
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)*/
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GLOBAL IBOOL
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Cpu_find_dcache_entry IFN2(IU16, seg, LIN_ADDR *, base)
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{
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if (GET_CS_SELECTOR() == seg) {
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*base = GET_CS_BASE();
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return(TRUE);
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} else {
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return(FALSE);
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}
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}
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