mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-29 15:14:18 +08:00
f78f7ed726
This avoid errors like
unsigned int usize = 1 << 30;
int size = 1 << 30;
unsigned long addr = 64UL << 30 ;
value = _ALIGN_DOWN(addr, usize); -> 0
value = _ALIGN_DOWN(addr, size); -> 0x1000000000
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
#ifndef _PPC_BOOT_PAGE_H
|
|
#define _PPC_BOOT_PAGE_H
|
|
/*
|
|
* Copyright (C) 2001 PPC64 Team, IBM Corp
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifdef __ASSEMBLY__
|
|
#define ASM_CONST(x) x
|
|
#else
|
|
#define __ASM_CONST(x) x##UL
|
|
#define ASM_CONST(x) __ASM_CONST(x)
|
|
#endif
|
|
|
|
/* PAGE_SHIFT determines the page size */
|
|
#define PAGE_SHIFT 12
|
|
#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
|
|
#define PAGE_MASK (~(PAGE_SIZE-1))
|
|
|
|
/* align addr on a size boundary - adjust address up/down if needed */
|
|
#define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((typeof(addr))(size)-1)))
|
|
#define _ALIGN_DOWN(addr, size) ((addr)&(~((typeof(addr))(size)-1)))
|
|
|
|
/* align addr on a size boundary - adjust address up if needed */
|
|
#define _ALIGN(addr,size) _ALIGN_UP(addr,size)
|
|
|
|
/* to align the pointer to the (next) page boundary */
|
|
#define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE)
|
|
|
|
#endif /* _PPC_BOOT_PAGE_H */
|