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87 lines
1.8 KiB
87 lines
1.8 KiB
/*[
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lldt.c
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LOCAL CHAR SccsID[]="@(#)lldt.c 1.8 01/19/95";
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LLDT 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 <lldt.h>
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#include <fault.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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LLDT
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IFN1(
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IU32, op1
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)
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{
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IU16 selector;
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IU32 descr_addr;
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CPU_DESCR entry;
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if ( selector_is_null(selector = op1) )
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{
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#ifndef DONT_CLEAR_LDTR_ON_INVALID
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SET_LDT_SELECTOR(selector);
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#else
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SET_LDT_SELECTOR(0); /* just invalidate LDT */
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#endif /* DONT_CLEAR_LDTR_ON_INVALID */
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#ifndef DONT_CLEAR_LDT_BL_ON_INVALID
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/* Make the C-CPU behave like the assembler CPU with respect
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* to LDT base and limit when the selector is set to NULL
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* - there is no way for an Intel app to determine the values
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* of the LDT base&limit so this will not affect the emulation
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*/
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SET_LDT_BASE(0);
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SET_LDT_LIMIT(0);
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#endif /* DONT_CLEAR_LDT_BL_ON_INVALID */
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}
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else
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{
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/* must be in GDT */
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if ( selector_outside_GDT(selector, &descr_addr) )
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GP(selector, FAULT_LLDT_SELECTOR);
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read_descriptor_linear(descr_addr, &entry);
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if ( descriptor_super_type(entry.AR) != LDT_SEGMENT )
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GP(selector, FAULT_LLDT_NOT_LDT);
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/* must be present */
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if ( GET_AR_P(entry.AR) == NOT_PRESENT )
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NP(selector, FAULT_LLDT_NP);
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/* all OK - load up register */
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SET_LDT_SELECTOR(selector);
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SET_LDT_BASE(entry.base);
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SET_LDT_LIMIT(entry.limit);
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}
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}
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