forked from Mirrors/wine-wine
63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
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/*
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* LDT copy
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*
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* Copyright 1995 Alexandre Julliard
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*/
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#ifndef _WINE_LDT_H
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#define _WINE_LDT_H
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enum seg_type
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{
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SEGMENT_DATA = 0,
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SEGMENT_STACK = 1,
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SEGMENT_CODE = 2
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};
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/* This structure represents a real LDT entry. */
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/* It is used by get_ldt_entry() and set_ldt_entry(). */
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typedef struct
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{
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unsigned long base; /* base address */
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unsigned long limit; /* segment limit */
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int seg_32bit; /* is segment 32-bit? */
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int read_only; /* is segment read-only? */
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int limit_in_pages; /* is the limit in pages or bytes? */
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enum seg_type type; /* segment type */
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} ldt_entry;
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extern int LDT_GetEntry( int entry, ldt_entry *content );
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extern int LDT_SetEntry( int entry, ldt_entry *content );
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extern void LDT_Print();
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/* This structure is used to build the local copy of the LDT. */
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typedef struct
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{
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unsigned long base; /* base address or 0 if entry is free */
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unsigned long limit; /* limit in bytes or 0 if entry is free */
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} ldt_copy_entry;
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#define LDT_SIZE 8192
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extern ldt_copy_entry ldt_copy[LDT_SIZE];
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#define __AHSHIFT 3
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#define __AHINCR (1 << __AHSHIFT)
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#define SELECTOR_TO_ENTRY(sel) ((int)(sel) >> __AHSHIFT)
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#define ENTRY_TO_SELECTOR(i) ((i) ? (((int)(i) << __AHSHIFT) | 7) : 0)
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#define IS_LDT_ENTRY_FREE(i) (!(ldt_copy[(i)].base || ldt_copy[(i)].limit))
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#define IS_SELECTOR_FREE(sel) (IS_LDT_ENTRY_FREE(SELECTOR_TO_ENTRY(sel)))
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#define GET_SEL_BASE(sel) (ldt_copy[SELECTOR_TO_ENTRY(sel)].base)
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#define GET_SEL_LIMIT(sel) (ldt_copy[SELECTOR_TO_ENTRY(sel)].limit)
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/* Convert a segmented ptr (16:16) to a linear (32) pointer */
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#define PTR_SEG_TO_LIN(ptr) \
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((void*)(GET_SEL_BASE((int)(ptr) >> 16) + ((int)(ptr) & 0xffff)))
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#define PTR_SEG_OFF_TO_LIN(seg,off) \
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((void*)(GET_SEL_BASE(seg) + ((int)(off) & 0xffff)))
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#endif /* _WINE_LDT_H */
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