203 lines
5.5 KiB
C
203 lines
5.5 KiB
C
#ifndef _ASM_POWERPC_PAGE_H
|
|
#define _ASM_POWERPC_PAGE_H
|
|
|
|
/*
|
|
* Copyright (C) 2001,2005 IBM Corporation.
|
|
*
|
|
* 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 __KERNEL__
|
|
#include <asm/asm-compat.h>
|
|
#include <asm/kdump.h>
|
|
|
|
/*
|
|
* On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software
|
|
* page size. When using 64K pages however, whether we are really supporting
|
|
* 64K pages in HW or not is irrelevant to those definitions.
|
|
*/
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
#define PAGE_SHIFT 16
|
|
#else
|
|
#define PAGE_SHIFT 12
|
|
#endif
|
|
|
|
#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
|
|
|
|
/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
|
|
#define __HAVE_ARCH_GATE_AREA 1
|
|
|
|
/*
|
|
* Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
|
|
* assign PAGE_MASK to a larger type it gets extended the way we want
|
|
* (i.e. with 1s in the high bits)
|
|
*/
|
|
#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
|
|
|
|
/*
|
|
* KERNELBASE is the virtual address of the start of the kernel, it's often
|
|
* the same as PAGE_OFFSET, but _might not be_.
|
|
*
|
|
* The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
|
|
*
|
|
* To get a physical address from a virtual one you subtract PAGE_OFFSET,
|
|
* _not_ KERNELBASE.
|
|
*
|
|
* If you want to know something's offset from the start of the kernel you
|
|
* should subtract KERNELBASE.
|
|
*
|
|
* If you want to test if something's a kernel address, use is_kernel_addr().
|
|
*/
|
|
|
|
#define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START)
|
|
#define KERNELBASE (PAGE_OFFSET + PHYSICAL_START)
|
|
|
|
#ifdef CONFIG_DISCONTIGMEM
|
|
#define page_to_pfn(page) discontigmem_page_to_pfn(page)
|
|
#define pfn_to_page(pfn) discontigmem_pfn_to_page(pfn)
|
|
#define pfn_valid(pfn) discontigmem_pfn_valid(pfn)
|
|
#endif
|
|
|
|
#ifdef CONFIG_FLATMEM
|
|
#define pfn_valid(pfn) ((pfn) < max_mapnr)
|
|
#endif
|
|
|
|
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
|
|
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
|
|
#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
|
|
|
|
#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
|
|
#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
|
|
|
|
/*
|
|
* Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
|
|
* and needs to be executable. This means the whole heap ends
|
|
* up being executable.
|
|
*/
|
|
#define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
|
|
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
|
|
|
|
#define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
|
|
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
|
|
|
|
#ifdef __powerpc64__
|
|
#include <asm/page_64.h>
|
|
#else
|
|
#include <asm/page_32.h>
|
|
#endif
|
|
|
|
/* align addr on a size boundary - adjust address up/down if needed */
|
|
#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
|
|
#define _ALIGN_DOWN(addr,size) ((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)
|
|
|
|
/*
|
|
* Don't compare things with KERNELBASE or PAGE_OFFSET to test for
|
|
* "kernelness", use is_kernel_addr() - it should do what you want.
|
|
*/
|
|
#define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#undef STRICT_MM_TYPECHECKS
|
|
|
|
#ifdef STRICT_MM_TYPECHECKS
|
|
/* These are used to make use of C type-checking. */
|
|
|
|
/* PTE level */
|
|
typedef struct { pte_basic_t pte; } pte_t;
|
|
#define pte_val(x) ((x).pte)
|
|
#define __pte(x) ((pte_t) { (x) })
|
|
|
|
/* 64k pages additionally define a bigger "real PTE" type that gathers
|
|
* the "second half" part of the PTE for pseudo 64k pages
|
|
*/
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
|
|
#else
|
|
typedef struct { pte_t pte; } real_pte_t;
|
|
#endif
|
|
|
|
/* PMD level */
|
|
typedef struct { unsigned long pmd; } pmd_t;
|
|
#define pmd_val(x) ((x).pmd)
|
|
#define __pmd(x) ((pmd_t) { (x) })
|
|
|
|
/* PUD level exusts only on 4k pages */
|
|
#ifndef CONFIG_PPC_64K_PAGES
|
|
typedef struct { unsigned long pud; } pud_t;
|
|
#define pud_val(x) ((x).pud)
|
|
#define __pud(x) ((pud_t) { (x) })
|
|
#endif
|
|
|
|
/* PGD level */
|
|
typedef struct { unsigned long pgd; } pgd_t;
|
|
#define pgd_val(x) ((x).pgd)
|
|
#define __pgd(x) ((pgd_t) { (x) })
|
|
|
|
/* Page protection bits */
|
|
typedef struct { unsigned long pgprot; } pgprot_t;
|
|
#define pgprot_val(x) ((x).pgprot)
|
|
#define __pgprot(x) ((pgprot_t) { (x) })
|
|
|
|
#else
|
|
|
|
/*
|
|
* .. while these make it easier on the compiler
|
|
*/
|
|
|
|
typedef pte_basic_t pte_t;
|
|
#define pte_val(x) (x)
|
|
#define __pte(x) (x)
|
|
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
|
|
#else
|
|
typedef unsigned long real_pte_t;
|
|
#endif
|
|
|
|
|
|
typedef unsigned long pmd_t;
|
|
#define pmd_val(x) (x)
|
|
#define __pmd(x) (x)
|
|
|
|
#if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_64K_PAGES)
|
|
typedef unsigned long pud_t;
|
|
#define pud_val(x) (x)
|
|
#define __pud(x) (x)
|
|
#endif
|
|
|
|
typedef unsigned long pgd_t;
|
|
#define pgd_val(x) (x)
|
|
#define pgprot_val(x) (x)
|
|
|
|
typedef unsigned long pgprot_t;
|
|
#define __pgd(x) (x)
|
|
#define __pgprot(x) (x)
|
|
|
|
#endif
|
|
|
|
struct page;
|
|
extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
|
|
extern void copy_user_page(void *to, void *from, unsigned long vaddr,
|
|
struct page *p);
|
|
extern int page_is_ram(unsigned long pfn);
|
|
|
|
struct vm_area_struct;
|
|
extern const char *arch_vma_name(struct vm_area_struct *vma);
|
|
|
|
#include <asm-generic/memory_model.h>
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_POWERPC_PAGE_H */
|