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kernel-ark/include/asm-ppc64/page.h
David Gibson e28f7faf05 [PATCH] Four level pagetables for ppc64 
Implement 4-level pagetables for ppc64

This patch implements full four-level page tables for ppc64, thereby
extending the usable user address range to 44 bits (16T).

The patch uses a full page for the tables at the bottom and top level,
and a quarter page for the intermediate levels.  It uses full 64-bit
pointers at every level, thus also increasing the addressable range of
physical memory.  This patch also tweaks the VSID allocation to allow
matching range for user addresses (this halves the number of available
contexts) and adds some #if and BUILD_BUG sanity checks.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-08-29 10:53:31 +10:00

269 lines
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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)
/* 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 ARCH_HAS_SETCLEAR_HUGE_PTE
#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) 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 */
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