mirror of
https://github.com/torvalds/linux
synced 2024-09-29 07:50:45 +00:00
19f9a34f87
This implements initial support for the vsyscall page on SH. At the moment we leave it configurable due to having nommu to support from the same code base. We hook it up for the signal trampoline return at present, with more to be added later, once uClibc catches up. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
#ifndef __ASM_SH_PAGE_H
|
|
#define __ASM_SH_PAGE_H
|
|
|
|
/*
|
|
* Copyright (C) 1999 Niibe Yutaka
|
|
*/
|
|
|
|
/*
|
|
[ P0/U0 (virtual) ] 0x00000000 <------ User space
|
|
[ P1 (fixed) cached ] 0x80000000 <------ Kernel space
|
|
[ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
|
|
[ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
|
|
[ P4 control ] 0xE0000000
|
|
*/
|
|
|
|
|
|
/* PAGE_SHIFT determines the page size */
|
|
#define PAGE_SHIFT 12
|
|
|
|
#ifdef __ASSEMBLY__
|
|
#define PAGE_SIZE (1 << PAGE_SHIFT)
|
|
#else
|
|
#define PAGE_SIZE (1UL << PAGE_SHIFT)
|
|
#endif
|
|
|
|
#define PAGE_MASK (~(PAGE_SIZE-1))
|
|
#define PTE_MASK PAGE_MASK
|
|
|
|
#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
|
|
#define HPAGE_SHIFT 16
|
|
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
|
|
#define HPAGE_SHIFT 20
|
|
#endif
|
|
|
|
#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
|
|
|
|
#ifdef __KERNEL__
|
|
#ifndef __ASSEMBLY__
|
|
|
|
extern void (*clear_page)(void *to);
|
|
extern void (*copy_page)(void *to, void *from);
|
|
|
|
#ifdef CONFIG_MMU
|
|
extern void clear_page_slow(void *to);
|
|
extern void copy_page_slow(void *to, void *from);
|
|
#else
|
|
extern void clear_page_nommu(void *to);
|
|
extern void copy_page_nommu(void *to, void *from);
|
|
#endif
|
|
|
|
#if defined(CONFIG_MMU) && (defined(CONFIG_CPU_SH4) || \
|
|
defined(CONFIG_SH7705_CACHE_32KB))
|
|
struct page;
|
|
extern void clear_user_page(void *to, unsigned long address, struct page *pg);
|
|
extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
|
|
extern void __clear_user_page(void *to, void *orig_to);
|
|
extern void __copy_user_page(void *to, void *from, void *orig_to);
|
|
#elif defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH3) || !defined(CONFIG_MMU)
|
|
#define clear_user_page(page, vaddr, pg) clear_page(page)
|
|
#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
|
|
#endif
|
|
|
|
/*
|
|
* 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;
|
|
|
|
#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) } )
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
/* to align the pointer to the (next) page boundary */
|
|
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
|
|
|
|
/*
|
|
* IF YOU CHANGE THIS, PLEASE ALSO CHANGE
|
|
*
|
|
* arch/sh/kernel/vmlinux.lds.S
|
|
*
|
|
* which has the same constant encoded..
|
|
*/
|
|
|
|
#define __MEMORY_START CONFIG_MEMORY_START
|
|
#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
|
|
|
|
#define PAGE_OFFSET CONFIG_PAGE_OFFSET
|
|
#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
|
|
#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
|
|
|
|
#define MAP_NR(addr) (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
|
|
|
|
#define phys_to_page(phys) (mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))
|
|
#define page_to_phys(page) (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
|
|
|
|
/* PFN start number, because of __MEMORY_START */
|
|
#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
|
|
#define ARCH_PFN_OFFSET (PFN_START)
|
|
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
|
|
#define pfn_valid(pfn) (((pfn) - PFN_START) < max_mapnr)
|
|
#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
|
|
|
|
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
|
|
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
|
|
|
|
#include <asm-generic/memory_model.h>
|
|
#include <asm-generic/page.h>
|
|
|
|
/* vDSO support */
|
|
#ifdef CONFIG_VSYSCALL
|
|
#define __HAVE_ARCH_GATE_AREA
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* __ASM_SH_PAGE_H */
|