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Diffstat (limited to 'include/asm-ppc64/page.h')
| -rw-r--r-- | include/asm-ppc64/page.h | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/include/asm-ppc64/page.h b/include/asm-ppc64/page.h new file mode 100644 index 00000000000..20e0f19324e --- /dev/null +++ b/include/asm-ppc64/page.h @@ -0,0 +1,261 @@ +#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 PAGE_OFFSET_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) + +/* For 64-bit processes the hugepage range is 1T-1.5T */ +#define TASK_HPAGE_BASE ASM_CONST(0x0000010000000000) +#define TASK_HPAGE_END ASM_CONST(0x0000018000000000) + +#define LOW_ESID_MASK(addr, len) (((1U << (GET_ESID(addr+len-1)+1)) \ + - (1U << GET_ESID(addr))) & 0xffff) + +#define ARCH_HAS_HUGEPAGE_ONLY_RANGE +#define ARCH_HAS_PREPARE_HUGEPAGE_RANGE + +#define touches_hugepage_low_range(mm, addr, len) \ + (LOW_ESID_MASK((addr), (len)) & mm->context.htlb_segs) +#define touches_hugepage_high_range(addr, len) \ + (((addr) > (TASK_HPAGE_BASE-(len))) && ((addr) < TASK_HPAGE_END)) + +#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.htlb_segs) +#define within_hugepage_high_range(addr, len) (((addr) >= TASK_HPAGE_BASE) \ + && ((addr)+(len) <= TASK_HPAGE_END) && ((addr)+(len) >= (addr))) + +#define is_hugepage_only_range(mm, addr, len) \ + (touches_hugepage_high_range((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) && \ + ( (((addr) >= TASK_HPAGE_BASE) && ((addr) < TASK_HPAGE_END)) || \ + ( ((addr) < 0x100000000L) && \ + ((1 << GET_ESID(addr)) & (context).htlb_segs) ) ) ) + +#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) double word boundary */ +#define DOUBLEWORD_ALIGN(addr) _ALIGN(addr,sizeof(unsigned long)) + +/* 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) +#define REGION_STRIDE (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 int pmd; } pmd_t; +typedef struct { unsigned int pgd; } pgd_t; +typedef struct { unsigned long pgprot; } pgprot_t; + +#define pte_val(x) ((x).pte) +#define pmd_val(x) ((x).pmd) +#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 __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 int pmd_t; +typedef unsigned int pgd_t; +typedef unsigned long pgprot_t; + +#define pte_val(x) (x) +#define pmd_val(x) (x) +#define pgd_val(x) (x) +#define pgprot_val(x) (x) + +#define __pte(x) (x) +#define __pmd(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 IOREGIONBASE ASM_CONST(0xE000000000000000) + +#define IO_REGION_ID (IOREGIONBASE>>REGION_SHIFT) +#define VMALLOC_REGION_ID (VMALLOCBASE>>REGION_SHIFT) +#define KERNEL_REGION_ID (KERNELBASE>>REGION_SHIFT) +#define USER_REGION_ID (0UL) +#define REGION_ID(X) (((unsigned long)(X))>>REGION_SHIFT) + +#define __bpn_to_ba(x) ((((unsigned long)(x))<<PAGE_SHIFT) + KERNELBASE) +#define __ba_to_bpn(x) ((((unsigned long)(x)) & ~REGION_MASK) >> PAGE_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) +#else +#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. + */ +#define VM_STACK_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) + +#endif /* __KERNEL__ */ +#endif /* _PPC64_PAGE_H */ |