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/*
* LDT copy
*
* Copyright 1995 Alexandre Julliard
*/
#ifndef WINE_LDT_H
#define WINE_LDT_H
#include "windef.h"
enum seg_type
{
SEGMENT_DATA = 0,
SEGMENT_STACK = 1,
SEGMENT_CODE = 2
};
/* This structure represents a real LDT entry. */
/* It is used by get_ldt_entry() and set_ldt_entry(). */
typedef struct
{
unsigned long base; /* base address */
unsigned long limit; /* segment limit (in pages or bytes) */
int seg_32bit; /* is segment 32-bit? */
int read_only; /* is segment read-only? */
int limit_in_pages; /* is the limit in pages or bytes? */
enum seg_type type; /* segment type */
} ldt_entry;
#ifdef __cplusplus
extern "C"
{
#endif
extern void LDT_BytesToEntry( const unsigned long *buffer, ldt_entry *content);
extern void LDT_EntryToBytes( unsigned long *buffer, const ldt_entry *content);
extern int LDT_GetEntry( int entry, ldt_entry *content );
extern int LDT_SetEntry( int entry, const ldt_entry *content );
extern void LDT_Print( int start, int length );
/* This structure is used to build the local copy of the LDT. */
typedef struct
{
unsigned long base; /* base address or 0 if entry is free */
unsigned long limit; /* limit in bytes or 0 if entry is free */
} ldt_copy_entry;
#define LDT_SIZE 8192
extern ldt_copy_entry ldt_copy[LDT_SIZE];
#define AHSHIFT 3 /* don't change! */
#define AHINCR (1 << AHSHIFT)
#define SELECTOR_TO_ENTRY(sel) (((int)(sel) & 0xffff) >> AHSHIFT)
#define ENTRY_TO_SELECTOR(i) ((i) ? (((int)(i) << AHSHIFT) | 7) : 0)
#define IS_LDT_ENTRY_FREE(i) (!(ldt_flags_copy[(i)] & LDT_FLAGS_ALLOCATED))
#define IS_SELECTOR_FREE(sel) (IS_LDT_ENTRY_FREE(SELECTOR_TO_ENTRY(sel)))
#define GET_SEL_BASE(sel) (ldt_copy[SELECTOR_TO_ENTRY(sel)].base)
#define GET_SEL_LIMIT(sel) (ldt_copy[SELECTOR_TO_ENTRY(sel)].limit)
/* Convert a segmented ptr (16:16) to a linear (32) pointer */
#define PTR_SEG_OFF_TO_LIN(seg,off) \
((void*)(GET_SEL_BASE(seg) + (unsigned int)(off)))
#define PTR_SEG_TO_LIN(ptr) \
PTR_SEG_OFF_TO_LIN(SELECTOROF(ptr),OFFSETOF(ptr))
#define PTR_SEG_OFF_TO_SEGPTR(seg,off) \
((SEGPTR)MAKELONG(off,seg))
#define PTR_SEG_OFF_TO_HUGEPTR(seg,off) \
PTR_SEG_OFF_TO_SEGPTR( (seg) + (HIWORD(off) << AHSHIFT), LOWORD(off) )
#define W32S_APPLICATION() (PROCESS_Current()->flags & PDB32_WIN32S_PROC)
#define W32S_OFFSET 0x10000
#define W32S_APP2WINE(addr, offset) ((addr)? (DWORD)(addr) + (DWORD)(offset) : 0)
#define W32S_WINE2APP(addr, offset) ((addr)? (DWORD)(addr) - (DWORD)(offset) : 0)
extern unsigned char ldt_flags_copy[LDT_SIZE];
#define LDT_FLAGS_TYPE 0x03 /* Mask for segment type */
#define LDT_FLAGS_READONLY 0x04 /* Segment is read-only (data) */
#define LDT_FLAGS_EXECONLY 0x04 /* Segment is execute-only (code) */
#define LDT_FLAGS_32BIT 0x08 /* Segment is 32-bit (code or stack) */
#define LDT_FLAGS_BIG 0x10 /* Segment is big (limit is in pages) */
#define LDT_FLAGS_ALLOCATED 0x80 /* Segment is allocated (no longer free) */
#define GET_SEL_FLAGS(sel) (ldt_flags_copy[SELECTOR_TO_ENTRY(sel)])
#define FIRST_LDT_ENTRY_TO_ALLOC 17
/* Determine if sel is a system selector (i.e. not managed by Wine) */
#define IS_SELECTOR_SYSTEM(sel) \
(!((sel) & 4) || (SELECTOR_TO_ENTRY(sel) < FIRST_LDT_ENTRY_TO_ALLOC))
#define IS_SELECTOR_32BIT(sel) \
(IS_SELECTOR_SYSTEM(sel) || (GET_SEL_FLAGS(sel) & LDT_FLAGS_32BIT))
#ifdef __cplusplus
}
#endif
#endif /* WINE_LDT_H */
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