9a8fd55899
The attached patches provides part 6 of an architecture implementation for the Tensilica Xtensa CPU series. Signed-off-by: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
136 lines
3.6 KiB
Plaintext
136 lines
3.6 KiB
Plaintext
/*
|
|
* linux/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.
|
|
*/
|
|
|
|
#ifndef _XTENSA_PAGE_H
|
|
#define _XTENSA_PAGE_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/processor.h>
|
|
#include <linux/config.h>
|
|
|
|
/*
|
|
* PAGE_SHIFT determines the page size
|
|
* PAGE_ALIGN(x) aligns the pointer to the (next) page boundary
|
|
*/
|
|
#define PAGE_SHIFT XCHAL_MMU_MIN_PTE_PAGE_SIZE
|
|
#define PAGE_SIZE (1 << PAGE_SHIFT)
|
|
#define PAGE_MASK (~(PAGE_SIZE-1))
|
|
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE - 1) & PAGE_MASK)
|
|
|
|
#define DCACHE_WAY_SIZE (XCHAL_DCACHE_SIZE / XCHAL_DCACHE_WAYS)
|
|
#define PAGE_OFFSET XCHAL_KSEG_CACHED_VADDR
|
|
|
|
#ifdef __ASSEMBLY__
|
|
|
|
#define __pgprot(x) (x)
|
|
|
|
#else
|
|
|
|
|
|
/*
|
|
* These are used to make use of C type-checking..
|
|
*/
|
|
typedef struct { unsigned long pte; } pte_t; /* page table entry */
|
|
typedef struct { unsigned long pmd; } pmd_t; /* PMD table entry */
|
|
typedef struct { unsigned long pgd; } pgd_t; /* PGD table entry */
|
|
typedef struct { unsigned long pgprot; } pgprot_t;
|
|
|
|
#define pte_val(x) ((x).pte)
|
|
#define pmd_val(x) ((x).pmd)
|
|
#define pgd_val(x) ((x).pgd)
|
|
#define pgprot_val(x) ((x).pgprot)
|
|
|
|
#define __pte(x) ((pte_t) { (x) } )
|
|
#define __pmd(x) ((pmd_t) { (x) } )
|
|
#define __pgd(x) ((pgd_t) { (x) } )
|
|
#define __pgprot(x) ((pgprot_t) { (x) } )
|
|
|
|
/*
|
|
* Pure 2^n version of get_order
|
|
*/
|
|
extern __inline__ 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
|
|
}
|
|
|
|
|
|
struct page;
|
|
extern void clear_page(void *page);
|
|
extern void copy_page(void *to, void *from);
|
|
|
|
/*
|
|
* If we have cache aliasing and writeback caches, we might have to do
|
|
* some extra work
|
|
*/
|
|
|
|
#if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK
|
|
void clear_user_page(void *addr, unsigned long vaddr, struct page* page);
|
|
void copy_user_page(void *to, void* from, unsigned long vaddr, struct page* page);
|
|
#else
|
|
# define clear_user_page(page,vaddr,pg) clear_page(page)
|
|
# define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
|
|
#endif
|
|
|
|
|
|
/*
|
|
* This handles the memory map. We handle pages at
|
|
* XCHAL_KSEG_CACHED_VADDR for kernels with 32 bit address space.
|
|
* These macros are for conversion of kernel address, not user
|
|
* addresses.
|
|
*/
|
|
|
|
#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
|
|
#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
|
|
#define pfn_valid(pfn) ((unsigned long)pfn < max_mapnr)
|
|
#ifndef CONFIG_DISCONTIGMEM
|
|
# define pfn_to_page(pfn) (mem_map + (pfn))
|
|
# define page_to_pfn(page) ((unsigned long)((page) - mem_map))
|
|
#else
|
|
# error CONFIG_DISCONTIGMEM not supported
|
|
#endif
|
|
|
|
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
|
|
#define page_to_virt(page) __va(page_to_pfn(page) << 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 WANT_PAGE_VIRTUAL
|
|
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
|
|
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _XTENSA_PAGE_H */
|