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linux/include/asm-ppc64/page.h

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C
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#ifndef _PPC64_PAGE_H
#define _PPC64_PAGE_H
/*
* Copyright (C) 2001 PPC64 Team, IBM Corp
*
* 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.
*/
#include <linux/config.h>
#ifdef __ASSEMBLY__
#define ASM_CONST(x) x
#else
#define __ASM_CONST(x) x##UL
#define ASM_CONST(x) __ASM_CONST(x)
#endif
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT 12
#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#define SID_SHIFT 28
#define SID_MASK 0xfffffffffUL
#define ESID_MASK 0xfffffffff0000000UL
#define GET_ESID(x) (((x) >> SID_SHIFT) & SID_MASK)
#define HPAGE_SHIFT 24
#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
#define HPAGE_MASK (~(HPAGE_SIZE - 1))
#ifdef CONFIG_HUGETLB_PAGE
#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
#define HTLB_AREA_SHIFT 40
#define HTLB_AREA_SIZE (1UL << HTLB_AREA_SHIFT)
#define GET_HTLB_AREA(x) ((x) >> HTLB_AREA_SHIFT)
#define LOW_ESID_MASK(addr, len) (((1U << (GET_ESID(addr+len-1)+1)) \
- (1U << GET_ESID(addr))) & 0xffff)
#define HTLB_AREA_MASK(addr, len) (((1U << (GET_HTLB_AREA(addr+len-1)+1)) \
- (1U << GET_HTLB_AREA(addr))) & 0xffff)
#define ARCH_HAS_HUGEPAGE_ONLY_RANGE
#define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
#define ARCH_HAS_SETCLEAR_HUGE_PTE
#define touches_hugepage_low_range(mm, addr, len) \
(LOW_ESID_MASK((addr), (len)) & (mm)->context.low_htlb_areas)
#define touches_hugepage_high_range(mm, addr, len) \
(HTLB_AREA_MASK((addr), (len)) & (mm)->context.high_htlb_areas)
#define __within_hugepage_low_range(addr, len, segmask) \
((LOW_ESID_MASK((addr), (len)) | (segmask)) == (segmask))
#define within_hugepage_low_range(addr, len) \
__within_hugepage_low_range((addr), (len), \
current->mm->context.low_htlb_areas)
#define __within_hugepage_high_range(addr, len, zonemask) \
((HTLB_AREA_MASK((addr), (len)) | (zonemask)) == (zonemask))
#define within_hugepage_high_range(addr, len) \
__within_hugepage_high_range((addr), (len), \
current->mm->context.high_htlb_areas)
#define is_hugepage_only_range(mm, addr, len) \
(touches_hugepage_high_range((mm), (addr), (len)) || \
touches_hugepage_low_range((mm), (addr), (len)))
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#define in_hugepage_area(context, addr) \
(cpu_has_feature(CPU_FTR_16M_PAGE) && \
( ((1 << GET_HTLB_AREA(addr)) & (context).high_htlb_areas) || \
( ((addr) < 0x100000000L) && \
((1 << GET_ESID(addr)) & (context).low_htlb_areas) ) ) )
#else /* !CONFIG_HUGETLB_PAGE */
#define in_hugepage_area(mm, addr) 0
#endif /* !CONFIG_HUGETLB_PAGE */
/* 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)
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#include <asm/cache.h>
#undef STRICT_MM_TYPECHECKS
#define REGION_SIZE 4UL
#define REGION_SHIFT 60UL
#define REGION_MASK (((1UL<<REGION_SIZE)-1UL)<<REGION_SHIFT)
static __inline__ void clear_page(void *addr)
{
unsigned long lines, line_size;
line_size = ppc64_caches.dline_size;
lines = ppc64_caches.dlines_per_page;
__asm__ __volatile__(
"mtctr %1 # clear_page\n\
1: dcbz 0,%0\n\
add %0,%0,%3\n\
bdnz+ 1b"
: "=r" (addr)
: "r" (lines), "0" (addr), "r" (line_size)
: "ctr", "memory");
}
extern void copy_page(void *to, void *from);
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);
#ifdef STRICT_MM_TYPECHECKS
/*
* These are used to make use of C type-checking.
* Entries in the pte table are 64b, while entries in the pgd & pmd are 32b.
*/
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pud; } pud_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
#define pte_val(x) ((x).pte)
#define pmd_val(x) ((x).pmd)
#define pud_val(x) ((x).pud)
#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 __pud(x) ((pud_t) { (x) })
#define __pgd(x) ((pgd_t) { (x) })
#define __pgprot(x) ((pgprot_t) { (x) })
#else
/*
* .. while these make it easier on the compiler
*/
typedef unsigned long pte_t;
typedef unsigned long pmd_t;
typedef unsigned long pud_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;
#define pte_val(x) (x)
#define pmd_val(x) (x)
#define pud_val(x) (x)
#define pgd_val(x) (x)
#define pgprot_val(x) (x)
#define __pte(x) (x)
#define __pmd(x) (x)
#define __pud(x) (x)
#define __pgd(x) (x)
#define __pgprot(x) (x)
#endif
#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
extern int page_is_ram(unsigned long pfn);
extern u64 ppc64_pft_size; /* Log 2 of page table size */
/* We do define AT_SYSINFO_EHDR but don't use the gate mecanism */
#define __HAVE_ARCH_GATE_AREA 1
#endif /* __ASSEMBLY__ */
#ifdef MODULE
#define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
#else
#define __page_aligned \
__attribute__((__aligned__(PAGE_SIZE), \
__section__(".data.page_aligned")))
#endif
/* This must match the -Ttext linker address */
/* Note: tophys & tovirt make assumptions about how */
/* KERNELBASE is defined for performance reasons. */
/* When KERNELBASE moves, those macros may have */
/* to change! */
#define PAGE_OFFSET ASM_CONST(0xC000000000000000)
#define KERNELBASE PAGE_OFFSET
#define VMALLOCBASE ASM_CONST(0xD000000000000000)
#define VMALLOC_REGION_ID (VMALLOCBASE >> REGION_SHIFT)
#define KERNEL_REGION_ID (KERNELBASE >> REGION_SHIFT)
#define USER_REGION_ID (0UL)
#define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT)
#define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))
#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_to_page(pfn) (mem_map + (pfn))
#define page_to_pfn(page) ((unsigned long)((page) - mem_map))
#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)
/*
* 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)
#define VM_DATA_DEFAULT_FLAGS \
(test_thread_flag(TIF_32BIT) ? \
VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
/*
* This is the default if a program doesn't have a PT_GNU_STACK
* program header entry. The PPC64 ELF ABI has a non executable stack
* stack by default, so in the absense of a PT_GNU_STACK program header
* we turn execute permission off.
*/
#define VM_STACK_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#define VM_STACK_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#define VM_STACK_DEFAULT_FLAGS \
(test_thread_flag(TIF_32BIT) ? \
VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
#endif /* __KERNEL__ */
#include <asm-generic/page.h>
#endif /* _PPC64_PAGE_H */
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