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[XTENSA] Use the generic version of get_order 

Use the generic version of get_order for processor configurations that
don't have the 'nsa/nsau' instructions.

Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
Chris Zankel 2007-08-06 23:12:24 -07:00
parent 5c1c8085b5
commit 26465f2f4f
1 changed files with 22 additions and 28 deletions
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50
include/asm-xtensa/page.h
View File

@ -1,11 +1,11 @@
/*
* linux/include/asm-xtensa/page.h
* include/asm-xtensa/page.h
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version2 as
* published by the Free Software Foundation.
*
* Copyright (C) 2001 - 2005 Tensilica Inc.
* Copyright (C) 2001 - 2007 Tensilica Inc.
*/
#ifndef _XTENSA_PAGE_H
@ -14,6 +14,11 @@
#ifdef __KERNEL__
#include <asm/processor.h>
#include <asm/types.h>
/*
* Fixed TLB translations in the processor.
*/
#define XCHAL_KSEG_CACHED_VADDR 0xd0000000
#define XCHAL_KSEG_BYPASS_VADDR 0xd8000000
@ -26,13 +31,13 @@
*/
#define PAGE_SHIFT 12
#define PAGE_SIZE (1 << PAGE_SHIFT)
#define PAGE_SIZE (__XTENSA_UL_CONST(1) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE - 1) & PAGE_MASK)
#define PAGE_OFFSET XCHAL_KSEG_CACHED_VADDR
#define MAX_MEM_PFN XCHAL_KSEG_SIZE
#define PGTABLE_START 0x80000000
#define MAX_MEM_PFN XCHAL_KSEG_SIZE
#define PGTABLE_START 0x80000000
#ifdef __ASSEMBLY__
@ -58,34 +63,23 @@ typedef struct { unsigned long pgprot; } pgprot_t;
/*
* Pure 2^n version of get_order
* Use 'nsau' instructions if supported by the processor or the generic version.
*/
static inline int get_order(unsigned long size)
#if XCHAL_HAVE_NSA
static inline __attribute_const__ int get_order(unsigned long size)
{
int order;
#ifndef XCHAL_HAVE_NSU
unsigned long x1, x2, x4, x8, x16;
size = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
x1 = size & 0xAAAAAAAA;
x2 = size & 0xCCCCCCCC;
x4 = size & 0xF0F0F0F0;
x8 = size & 0xFF00FF00;
x16 = size & 0xFFFF0000;
order = x2 ? 2 : 0;
order += (x16 != 0) * 16;
order += (x8 != 0) * 8;
order += (x4 != 0) * 4;
order += (x1 != 0);
return order;
#else
size = (size - 1) >> PAGE_SHIFT;
asm ("nsau %0, %1" : "=r" (order) : "r" (size));
return 32 - order;
#endif
int lz;
asm ("nsau %0, %1" : "=r" (lz) : "r" ((size - 1) >> PAGE_SHIFT));
return 32 - lz;
}
#else
# include <asm-generic/page.h>
#endif
struct page;
extern void clear_page(void *page);