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101 lines
2.0 KiB
101 lines
2.0 KiB
/*[
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lar.c
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LOCAL CHAR SccsID[]="@(#)lar.c 1.5 02/09/94";
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LAR CPU Functions.
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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 <xt.h>
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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 <lar.h>
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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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GLOBAL VOID
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LAR
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IFN2(
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IU32 *, pop1, /* pntr to dst operand */
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IU32, op2 /* src operand */
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)
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{
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BOOL loadable = FALSE;
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IU32 descr_addr;
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CPU_DESCR entry;
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if ( !selector_outside_GDT_LDT((IU16)op2, &descr_addr) )
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{
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/* read descriptor from memory */
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read_descriptor_linear(descr_addr, &entry);
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switch ( descriptor_super_type(entry.AR) )
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{
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case INVALID:
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break; /* never loaded */
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case CONFORM_NOREAD_CODE:
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case CONFORM_READABLE_CODE:
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loadable = TRUE; /* always loadable */
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break;
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case INTERRUPT_GATE:
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case TRAP_GATE:
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case XTND_AVAILABLE_TSS:
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case XTND_BUSY_TSS:
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case XTND_CALL_GATE:
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case XTND_INTERRUPT_GATE:
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case XTND_TRAP_GATE:
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case AVAILABLE_TSS:
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case LDT_SEGMENT:
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case BUSY_TSS:
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case CALL_GATE:
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case TASK_GATE:
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case EXPANDUP_READONLY_DATA:
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case EXPANDUP_WRITEABLE_DATA:
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case EXPANDDOWN_READONLY_DATA:
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case EXPANDDOWN_WRITEABLE_DATA:
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case NONCONFORM_NOREAD_CODE:
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case NONCONFORM_READABLE_CODE:
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/* access depends on privilege, it is required that
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DPL >= CPL and DPL >= RPL */
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if ( GET_AR_DPL(entry.AR) >= GET_CPL() &&
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GET_AR_DPL(entry.AR) >= GET_SELECTOR_RPL(op2) )
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loadable = TRUE;
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break;
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}
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}
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if ( loadable )
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{
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/* Give em the access rights, in a suitable format */
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*pop1 = (IU32)entry.AR << 8;
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SET_ZF(1);
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}
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else
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{
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SET_ZF(0);
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}
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}
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