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page_64.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)

/* Segment size; normal 256M segments */
#define SID_SHIFT       28
#define SID_MASK        ASM_CONST(0xfffffffff)
#define ESID_MASK       0xfffffffff0000000UL
#define GET_ESID(x)           (((x) >> SID_SHIFT) & SID_MASK)

/* 1T segments */
#define SID_SHIFT_1T          40
#define SID_MASK_1T           0xffffffUL
#define ESID_MASK_1T          0xffffff0000000000UL
#define GET_ESID_1T(x)        (((x) >> SID_SHIFT_1T) & SID_MASK_1T)

#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 */
#ifdef CONFIG_HUGETLB_PAGE
extern unsigned int HPAGE_SHIFT;
#else
#define HPAGE_SHIFT PAGE_SHIFT
#endif
#define HPAGE_SIZE            ((1UL) << HPAGE_SHIFT)
#define HPAGE_MASK            (~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER    (HPAGE_SHIFT - PAGE_SHIFT)
#define HUGE_MAX_HSTATE       3

#endif /* __ASSEMBLY__ */

#ifdef CONFIG_PPC_MM_SLICES

#define SLICE_LOW_SHIFT       28
#define SLICE_HIGH_SHIFT      40

#define SLICE_LOW_TOP         (0x100000000ul)
#define SLICE_NUM_LOW         (SLICE_LOW_TOP >> SLICE_LOW_SHIFT)
#define SLICE_NUM_HIGH        (PGTABLE_RANGE >> SLICE_HIGH_SHIFT)

#define GET_LOW_SLICE_INDEX(addr)   ((addr) >> SLICE_LOW_SHIFT)
#define GET_HIGH_SLICE_INDEX(addr)  ((addr) >> SLICE_HIGH_SHIFT)

#ifndef __ASSEMBLY__

struct slice_mask {
      u16 low_slices;
      u16 high_slices;
};

struct mm_struct;

extern unsigned long slice_get_unmapped_area(unsigned long addr,
                                   unsigned long len,
                                   unsigned long flags,
                                   unsigned int psize,
                                   int topdown,
                                   int use_cache);

extern unsigned int get_slice_psize(struct mm_struct *mm,
                            unsigned long addr);

extern void slice_init_context(struct mm_struct *mm, unsigned int psize);
extern void slice_set_user_psize(struct mm_struct *mm, unsigned int psize);
extern void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
                          unsigned long len, unsigned int psize);

#define slice_mm_new_context(mm)    ((mm)->context.id == 0)

#endif /* __ASSEMBLY__ */
#else
#define slice_init()
#define get_slice_psize(mm, addr)   ((mm)->context.user_psize)
#define slice_set_user_psize(mm, psize)         \
do {                                \
      (mm)->context.user_psize = (psize); \
      (mm)->context.sllp = SLB_VSID_USER | mmu_psize_defs[(psize)].sllp; \
} while (0)
#define slice_set_range_psize(mm, start, len, psize)  \
      slice_set_user_psize((mm), (psize))
#define slice_mm_new_context(mm)    1
#endif /* CONFIG_PPC_MM_SLICES */

#ifdef CONFIG_HUGETLB_PAGE

#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA

#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 */

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