#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 */