mirror of
https://github.com/adulau/aha.git
synced 2024-12-28 19:56:18 +00:00
27ac792ca0
On 32-bit architectures PAGE_ALIGN() truncates 64-bit values to the 32-bit boundary. For example: u64 val = PAGE_ALIGN(size); always returns a value < 4GB even if size is greater than 4GB. The problem resides in PAGE_MASK definition (from include/asm-x86/page.h for example): #define PAGE_SHIFT 12 #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1)) ... #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) The "~" is performed on a 32-bit value, so everything in "and" with PAGE_MASK greater than 4GB will be truncated to the 32-bit boundary. Using the ALIGN() macro seems to be the right way, because it uses typeof(addr) for the mask. Also move the PAGE_ALIGN() definitions out of include/asm-*/page.h in include/linux/mm.h. See also lkml discussion: http://lkml.org/lkml/2008/6/11/237 [akpm@linux-foundation.org: fix drivers/media/video/uvc/uvc_queue.c] [akpm@linux-foundation.org: fix v850] [akpm@linux-foundation.org: fix powerpc] [akpm@linux-foundation.org: fix arm] [akpm@linux-foundation.org: fix mips] [akpm@linux-foundation.org: fix drivers/media/video/pvrusb2/pvrusb2-dvb.c] [akpm@linux-foundation.org: fix drivers/mtd/maps/uclinux.c] [akpm@linux-foundation.org: fix powerpc] Signed-off-by: Andrea Righi <righi.andrea@gmail.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/* MN10300 Page table definitions
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#ifndef _ASM_PAGE_H
|
|
#define _ASM_PAGE_H
|
|
|
|
/* PAGE_SHIFT determines the page size */
|
|
#define PAGE_SHIFT 12
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#define PAGE_SIZE (1UL << PAGE_SHIFT)
|
|
#define PAGE_MASK (~(PAGE_SIZE - 1))
|
|
#else
|
|
#define PAGE_SIZE +(1 << PAGE_SHIFT) /* unary plus marks an
|
|
* immediate val not an addr */
|
|
#define PAGE_MASK +(~(PAGE_SIZE - 1))
|
|
#endif
|
|
|
|
#ifdef __KERNEL__
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
|
|
#define copy_page(to, from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
|
|
|
|
#define clear_user_page(addr, vaddr, page) clear_page(addr)
|
|
#define copy_user_page(vto, vfrom, vaddr, to) copy_page(vto, vfrom)
|
|
|
|
/*
|
|
* These are used to make use of C type-checking..
|
|
*/
|
|
typedef struct { unsigned long pte; } pte_t;
|
|
typedef struct { unsigned long pgd; } pgd_t;
|
|
typedef struct { unsigned long pgprot; } pgprot_t;
|
|
typedef struct page *pgtable_t;
|
|
|
|
#define PTE_MASK PAGE_MASK
|
|
#define HPAGE_SHIFT 22
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
|
|
#define HPAGE_MASK (~(HPAGE_SIZE - 1))
|
|
#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
|
|
#endif
|
|
|
|
#define pte_val(x) ((x).pte)
|
|
#define pgd_val(x) ((x).pgd)
|
|
#define pgprot_val(x) ((x).pgprot)
|
|
|
|
#define __pte(x) ((pte_t) { (x) })
|
|
#define __pgd(x) ((pgd_t) { (x) })
|
|
#define __pgprot(x) ((pgprot_t) { (x) })
|
|
|
|
#include <asm-generic/pgtable-nopmd.h>
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
/*
|
|
* This handles the memory map.. We could make this a config
|
|
* option, but too many people screw it up, and too few need
|
|
* it.
|
|
*
|
|
* A __PAGE_OFFSET of 0xC0000000 means that the kernel has
|
|
* a virtual address space of one gigabyte, which limits the
|
|
* amount of physical memory you can use to about 950MB.
|
|
*/
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
/* Pure 2^n version of get_order */
|
|
static inline int get_order(unsigned long size) __attribute__((const));
|
|
static inline int get_order(unsigned long size)
|
|
{
|
|
int order;
|
|
|
|
size = (size - 1) >> (PAGE_SHIFT - 1);
|
|
order = -1;
|
|
do {
|
|
size >>= 1;
|
|
order++;
|
|
} while (size);
|
|
return order;
|
|
}
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#include <asm/page_offset.h>
|
|
|
|
#define __PAGE_OFFSET (PAGE_OFFSET_RAW)
|
|
#define PAGE_OFFSET ((unsigned long) __PAGE_OFFSET)
|
|
|
|
/*
|
|
* main RAM and kernel working space are coincident at 0x90000000, but to make
|
|
* life more interesting, there's also an uncached virtual shadow at 0xb0000000
|
|
* - these mappings are fixed in the MMU
|
|
*/
|
|
#define __pfn_disp (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT)
|
|
|
|
#define __pa(x) ((unsigned long)(x))
|
|
#define __va(x) ((void *)(unsigned long)(x))
|
|
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
|
|
#define pfn_to_page(pfn) (mem_map + ((pfn) - __pfn_disp))
|
|
#define page_to_pfn(page) ((unsigned long)((page) - mem_map) + __pfn_disp)
|
|
|
|
#define pfn_valid(pfn) \
|
|
({ \
|
|
unsigned long __pfn = (pfn) - __pfn_disp; \
|
|
__pfn < max_mapnr; \
|
|
})
|
|
|
|
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
|
|
#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
|
|
#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
|
|
|
|
#define VM_DATA_DEFAULT_FLAGS \
|
|
(VM_READ | VM_WRITE | \
|
|
((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
|
|
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_PAGE_H */
|