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omBinPage.h
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/*******************************************************************
* File: omBinPage.h
* Purpose: declaration of routines for primitve BinPage managment
* Author: obachman (Olaf Bachmann)
* Created: 11/99
*******************************************************************/
#ifndef OM_BIN_PAGE_H
#define OM_BIN_PAGE_H
/***********************************************************************
*
* Macros for page manipulations
*
**********************************************************************/
#define omIsAddrPageAligned(addr) \
(((long) (addr) & (SIZEOF_SYSTEM_PAGE -1)) == 0)
#define omGetPageOfAddr(addr) \
((void*) (((long)addr) & ~(SIZEOF_SYSTEM_PAGE -1)))
#define omGetBinPageOfAddr(addr) \
((omBinPage) ((long) (addr) & ~(SIZEOF_SYSTEM_PAGE -1)))
#define omIsAddrOnPage(addr, page) (omGetPageOfAddr(addr) == (void*) (page))
#define omAreAddrOnSamePage(a1, a2) \
(omGetPageOfAddr(a1) == omGetPageOfAddr(a2))
/***********************************************************************
*
* Identifying whether an address is a BinPageAddr:
*
*******************************************************************/
/* Here is how it works (assume SIZEOF_LONG == 4, SIZEOF_SYSTEM_PAGE = 2^12):
Let
Addr: | 15 | 5 | 12 |
PAGE_INDEX PAGE_SHIFT PAGE_OFFSET
PAGE_BASE
om_PageIndicies is an array of bit-fields which is indexed by
PAGE_INDEX - om_MinBinPageIndex. Its maximal length
is 2^15. PAGE_SHIFT is used as index into the bit-field.
If it's value is 1, then addr is from omBinPage, else
not.
om_MinPageIndex is minimal page index of registered BinPageAddr
In other words: omIsBinPageAddr iff PAGE_INDEX >= om_MinBinPageIndex && PAGE_INDEX <= om_MaxBinPageIndex
&& om_PageIndicies[PAGE_INDEX - om_MinPageIndex] & (1 << PAGE_SHIFT) */
extern unsigned long om_MaxBinPageIndex;
extern unsigned long om_MinBinPageIndex;
extern unsigned long *om_BinPageIndicies;
#define OM_SIZEOF_INDEX_PAGE (((unsigned long) SIZEOF_SYSTEM_PAGE) << LOG_BIT_SIZEOF_LONG)
#define omGetPageShiftOfAddr(addr) \
((((unsigned long) addr) & (OM_SIZEOF_INDEX_PAGE -1)) >> LOG_BIT_SIZEOF_SYSTEM_PAGE)
#define omGetPageIndexOfAddr(addr) \
(((unsigned long) addr) >> (LOG_BIT_SIZEOF_LONG + LOG_BIT_SIZEOF_SYSTEM_PAGE))
#if !defined(OM_INLINE) || defined(OM_INTERNAL_DEBUG)
#define omIsBinPageAddr(addr) _omIsBinPageAddr(addr)
#else
/* let's hope the compiler can eliminate common subexpressions well */ \
#define omIsBinPageAddr(addr) \
((omGetPageIndexOfAddr(addr) >= om_MinBinPageIndex) && \
(omGetPageIndexOfAddr(addr) <= om_MaxBinPageIndex) && \
((om_BinPageIndicies[omGetPageIndexOfAddr(addr) - om_MinBinPageIndex] & \
(((unsigned long) 1) << omGetPageShiftOfAddr(addr))) != 0))
#endif
/*BEGINPRIVATE*/
/*******************************************************************
*
* Alloc/Free of BinPages
*
*******************************************************************/
extern omBinPage omAllocBinPages(int how_many);
extern omBinPage omAllocBinPage(void);
extern void omFreeBinPages(omBinPage page, int how_many);
#define omFreeBinPage(addr) omFreeBinPages(addr, 1)
/*ENDPRIVATE*/
#endif /* OM_BIN_PAGE_H */
om_MaxBinPageIndex
unsigned long om_MaxBinPageIndex
Definition omBinPage.c:36
om_MinBinPageIndex
unsigned long om_MinBinPageIndex
Definition omBinPage.c:37
om_BinPageIndicies
unsigned long * om_BinPageIndicies
Definition omBinPage.c:38
omAllocBinPages
omBinPage omAllocBinPages(int how_many)
Definition omBinPage.c:149
omAllocBinPage
omBinPage omAllocBinPage(void)
Definition omBinPage.c:98
omFreeBinPages
void omFreeBinPages(omBinPage page, int how_many)
Definition omBinPage.c:206
omBinPage
omBinPage_t * omBinPage
Definition omStructs.h:16