[PATCH] powerpc: Merge page.h

#ifndef _ASM_POWERPC_PAGE_H

#define _ASM_POWERPC_PAGE_H

/*

 * Copyright (C) 2001,2005 IBM Corporation.

 *

 * 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.

 */

#ifdef __KERNEL__

#include <linux/config.h>

#include <asm/asm-compat.h>

/*

 * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software

 * page size. When using 64K pages however, whether we are really supporting

 * 64K pages in HW or not is irrelevant to those definitions.

 */

#ifdef CONFIG_PPC_64K_PAGES

#define PAGE_SHIFT		16

#else

#define PAGE_SHIFT		12

#endif

#define PAGE_SIZE		(ASM_CONST(1) << PAGE_SHIFT)

/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */

#define __HAVE_ARCH_GATE_AREA		1

/*

 * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we

 * assign PAGE_MASK to a larger type it gets extended the way we want

 * (i.e. with 1s in the high bits)

 */

#define PAGE_MASK      (~((1 << PAGE_SHIFT) - 1))

#define PAGE_OFFSET     ASM_CONST(CONFIG_KERNEL_START)

#define KERNELBASE      PAGE_OFFSET

#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)

#define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))

#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)

/*

 * 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)

#ifdef __powerpc64__

#include <asm/page_64.h>

#else

#include <asm/page_32.h>

#endif

/* 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)

#ifndef __ASSEMBLY__

#undef STRICT_MM_TYPECHECKS

#ifdef STRICT_MM_TYPECHECKS

/* These are used to make use of C type-checking. */

/* PTE level */

typedef struct { pte_basic_t pte; } pte_t;

#define pte_val(x)	((x).pte)

#define __pte(x)	((pte_t) { (x) })

/* 64k pages additionally define a bigger "real PTE" type that gathers

 * the "second half" part of the PTE for pseudo 64k pages

 */

#ifdef CONFIG_PPC_64K_PAGES

typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;

#else

typedef struct { pte_t pte; } real_pte_t;

#endif

/* PMD level */

typedef struct { unsigned long pmd; } pmd_t;

#define pmd_val(x)	((x).pmd)

#define __pmd(x)	((pmd_t) { (x) })

/* PUD level exusts only on 4k pages */

#ifndef CONFIG_PPC_64K_PAGES

typedef struct { unsigned long pud; } pud_t;

#define pud_val(x)	((x).pud)

#define __pud(x)	((pud_t) { (x) })

#endif

/* PGD level */

typedef struct { unsigned long pgd; } pgd_t;

#define pgd_val(x)	((x).pgd)

#define __pgd(x)	((pgd_t) { (x) })

/* Page protection bits */

typedef struct { unsigned long pgprot; } pgprot_t;

#define pgprot_val(x)	((x).pgprot)

#define __pgprot(x)	((pgprot_t) { (x) })

#else

/*

 * .. while these make it easier on the compiler

 */

typedef pte_basic_t pte_t;

#define pte_val(x)	(x)

#define __pte(x)	(x)

#ifdef CONFIG_PPC_64K_PAGES

typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;

#else

typedef unsigned long real_pte_t;

#endif

typedef unsigned long pmd_t;

#define pmd_val(x)	(x)

#define __pmd(x)	(x)

#ifndef CONFIG_PPC_64K_PAGES

typedef unsigned long pud_t;

#define pud_val(x)	(x)

#define __pud(x)	(x)

#endif

typedef unsigned long pgd_t;

#define pgd_val(x)	(x)

#define pgprot_val(x)	(x)

typedef unsigned long pgprot_t;

#define __pgd(x)	(x)

#define __pgprot(x)	(x)

#endif

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);

extern int page_is_ram(unsigned long pfn);

#endif /* __ASSEMBLY__ */

#endif /* __KERNEL__ */

#endif /* _ASM_POWERPC_PAGE_H */

#ifndef _ASM_POWERPC_PAGE_32_H

#define _ASM_POWERPC_PAGE_32_H

#define VM_DATA_DEFAULT_FLAGS	VM_DATA_DEFAULT_FLAGS32

#ifndef __ASSEMBLY__

/*

 * The basic type of a PTE - 64 bits for those CPUs with > 32 bit

 * physical addressing.  For now this just the IBM PPC440.

 */

#ifdef CONFIG_PTE_64BIT

typedef unsigned long long pte_basic_t;

#define PTE_SHIFT	(PAGE_SHIFT - 3)	/* 512 ptes per page */

#define PTE_FMT		"%16Lx"

#else

typedef unsigned long pte_basic_t;

#define PTE_SHIFT	(PAGE_SHIFT - 2)	/* 1024 ptes per page */

#define PTE_FMT		"%.8lx"

#endif

struct page;

extern void clear_pages(void *page, int order);

static inline void clear_page(void *page) { clear_pages(page, 0); }

extern void copy_page(void *to, void *from);

/* Pure 2^n version of get_order */

extern __inline__ int get_order(unsigned long size)

{

	int lz;

	size = (size-1) >> PAGE_SHIFT;

	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));

	return 32 - lz;

}

#endif /* __ASSEMBLY__ */

#endif /* _ASM_POWERPC_PAGE_32_H */

#ifndef _ASM_POWERPC_PAGE_64_H

#define _ASM_POWERPC_PAGE_64_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.

 */

/*

 * We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux

 * specific, every notion of page number shared with the firmware, TCEs,

 * iommu, etc... still uses a page size of 4K.

 */

#define HW_PAGE_SHIFT		12

#define HW_PAGE_SIZE		(ASM_CONST(1) << HW_PAGE_SHIFT)

#define HW_PAGE_MASK		(~(HW_PAGE_SIZE-1))

/*

 * PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and

 * HW_PAGE_SHIFT, that is 4K pages.

 */

#define PAGE_FACTOR		(PAGE_SHIFT - HW_PAGE_SHIFT)

#define REGION_SIZE   4UL

#define REGION_SHIFT  60UL

#define REGION_MASK   (((1UL<<REGION_SIZE)-1UL)<<REGION_SHIFT)

#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)

/* Segment size */

#define SID_SHIFT		28

#define SID_MASK		0xfffffffffUL

#define ESID_MASK		0xfffffffff0000000UL

#define GET_ESID(x)		(((x) >> SID_SHIFT) & SID_MASK)

#ifndef __ASSEMBLY__

#include <asm/cache.h>

typedef unsigned long pte_basic_t;

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_4K_page(void *to, void *from);

#ifdef CONFIG_PPC_64K_PAGES

static inline void copy_page(void *to, void *from)

{

	unsigned int i;

	for (i=0; i < (1 << (PAGE_SHIFT - 12)); i++) {

		copy_4K_page(to, from);

		to += 4096;

		from += 4096;

	}

}

#else /* CONFIG_PPC_64K_PAGES */

static inline void copy_page(void *to, void *from)

{

	copy_4K_page(to, from);

}

#endif /* CONFIG_PPC_64K_PAGES */

/* Log 2 of page table size */

extern u64 ppc64_pft_size;

/* Large pages size */

extern unsigned int HPAGE_SHIFT;

#define HPAGE_SIZE		((1UL) << HPAGE_SHIFT)

#define HPAGE_MASK		(~(HPAGE_SIZE - 1))

#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)

#endif /* __ASSEMBLY__ */

#ifdef CONFIG_HUGETLB_PAGE

#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 */

#ifdef MODULE

#define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))

#else

#define __page_aligned \

	__attribute__((__aligned__(PAGE_SIZE), \

		__section__(".data.page_aligned")))

#endif

#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)

#include <asm-generic/page.h>

#endif /* _ASM_POWERPC_PAGE_64_H */