| #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 |
| |
| /* Pure 2^n version of get_order */ |
| static inline int get_order(unsigned long size) |
| { |
| int order; |
| |
| size = (size-1) >> (PAGE_SHIFT-1); |
| order = -1; |
| do { |
| size >>= 1; |
| order++; |
| } while (size); |
| return order; |
| } |
| |
| #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__ */ |
| #endif /* _PPC64_PAGE_H */ |