mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-28 04:33:05 +00:00
877338c6cf
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14293 91177308-0d34-0410-b5e6-96231b3b80d8
50 lines
1.1 KiB
C++
50 lines
1.1 KiB
C++
/*
|
|
* The LLVM Compiler Infrastructure
|
|
*
|
|
* This file was developed by the LLVM research group and is distributed under
|
|
* the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
*
|
|
******************************************************************************
|
|
*
|
|
* This header file provides a platform-independent way of quering page size.
|
|
*/
|
|
|
|
#ifndef PAGESIZE_H
|
|
#define PAGESIZE_H
|
|
|
|
#include "Config/unistd.h"
|
|
#include <sys/param.h>
|
|
|
|
namespace llvm {
|
|
|
|
/* Compatibility chart:
|
|
*
|
|
* Linux/x86: _SC_PAGESIZE, _SC_PAGE_SIZE
|
|
* MacOS X/PowerPC: v. 10.2: NBPG,
|
|
* v. 10.3: _SC_PAGESIZE
|
|
* Solaris/Sparc: _SC_PAGESIZE, _SC_PAGE_SIZE
|
|
*/
|
|
|
|
/**
|
|
* GetPageSize - wrapper to return page size in bytes for various
|
|
* architecture/OS combinations
|
|
*/
|
|
unsigned GetPageSize() {
|
|
#ifdef _SC_PAGESIZE
|
|
return sysconf(_SC_PAGESIZE);
|
|
#elif defined(_SC_PAGE_SIZE)
|
|
return sysconf(_SC_PAGE_SIZE);
|
|
#elif defined(NBPG)
|
|
#ifndef CLSIZE
|
|
#define CLSIZE 1
|
|
#endif
|
|
return NBPG * CLSIZE;
|
|
#else
|
|
return 4096; /* allocate 4KB as a fall-back */
|
|
#endif
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|