Release 4.14 arch/alpha/include/asm/pgtable.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ALPHA_PGTABLE_H

#define _ALPHA_PGTABLE_H

#include <asm-generic/4level-fixup.h>

/*
 * This file contains the functions and defines necessary to modify and use
 * the Alpha page table tree.
 *
 * This hopefully works with any standard Alpha page-size, as defined
 * in <asm/page.h> (currently 8192).
 */
#include <linux/mmzone.h>

#include <asm/page.h>
#include <asm/processor.h>	/* For TASK_SIZE */
#include <asm/machvec.h>
#include <asm/setup.h>

struct mm_struct;
struct vm_area_struct;

/* Certain architectures need to do special things when PTEs
 * within a page table are directly modified.  Thus, the following
 * hook is made available.
 */

#define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))

#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)

/* PMD_SHIFT determines the size of the area a second-level page table can map */

#define PMD_SHIFT	(PAGE_SHIFT + (PAGE_SHIFT-3))

#define PMD_SIZE	(1UL << PMD_SHIFT)

#define PMD_MASK	(~(PMD_SIZE-1))

/* PGDIR_SHIFT determines what a third-level page table entry can map */

#define PGDIR_SHIFT	(PAGE_SHIFT + 2*(PAGE_SHIFT-3))

#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)

#define PGDIR_MASK	(~(PGDIR_SIZE-1))

/*
 * Entries per page directory level:  the Alpha is three-level, with
 * all levels having a one-page page table.
 */

#define PTRS_PER_PTE	(1UL << (PAGE_SHIFT-3))

#define PTRS_PER_PMD	(1UL << (PAGE_SHIFT-3))

#define PTRS_PER_PGD	(1UL << (PAGE_SHIFT-3))

#define USER_PTRS_PER_PGD	(TASK_SIZE / PGDIR_SIZE)

#define FIRST_USER_ADDRESS	0UL

/* Number of pointers that fit on a page:  this will go away. */

#define PTRS_PER_PAGE	(1UL << (PAGE_SHIFT-3))

#ifdef CONFIG_ALPHA_LARGE_VMALLOC

#define VMALLOC_START		0xfffffe0000000000
#else

#define VMALLOC_START		(-2*PGDIR_SIZE)
#endif

#define VMALLOC_END		(-PGDIR_SIZE)

/*
 * OSF/1 PAL-code-imposed page table bits
 */

#define _PAGE_VALID	0x0001

#define _PAGE_FOR	0x0002	
/* used for page protection (fault on read) */

#define _PAGE_FOW	0x0004	
/* used for page protection (fault on write) */

#define _PAGE_FOE	0x0008	
/* used for page protection (fault on exec) */

#define _PAGE_ASM	0x0010

#define _PAGE_KRE	0x0100	
/* xxx - see below on the "accessed" bit */

#define _PAGE_URE	0x0200	
/* xxx */

#define _PAGE_KWE	0x1000	
/* used to do the dirty bit in software */

#define _PAGE_UWE	0x2000	
/* used to do the dirty bit in software */

/* .. and these are ours ... */

#define _PAGE_DIRTY	0x20000

#define _PAGE_ACCESSED	0x40000

/*
 * NOTE! The "accessed" bit isn't necessarily exact:  it can be kept exactly
 * by software (use the KRE/URE/KWE/UWE bits appropriately), but I'll fake it.
 * Under Linux/AXP, the "accessed" bit just means "read", and I'll just use
 * the KRE/URE bits to watch for it. That way we don't need to overload the
 * KWE/UWE bits with both handling dirty and accessed.
 *
 * Note that the kernel uses the accessed bit just to check whether to page
 * out a page or not, so it doesn't have to be exact anyway.
 */


#define __DIRTY_BITS	(_PAGE_DIRTY | _PAGE_KWE | _PAGE_UWE)

#define __ACCESS_BITS	(_PAGE_ACCESSED | _PAGE_KRE | _PAGE_URE)


#define _PFN_MASK	0xFFFFFFFF00000000UL


#define _PAGE_TABLE	(_PAGE_VALID | __DIRTY_BITS | __ACCESS_BITS)

#define _PAGE_CHG_MASK	(_PFN_MASK | __DIRTY_BITS | __ACCESS_BITS)

/*
 * All the normal masks have the "page accessed" bits on, as any time they are used,
 * the page is accessed. They are cleared only by the page-out routines
 */

#define PAGE_NONE	__pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOR | _PAGE_FOW | _PAGE_FOE)

#define PAGE_SHARED	__pgprot(_PAGE_VALID | __ACCESS_BITS)

#define PAGE_COPY	__pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOW)

#define PAGE_READONLY	__pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOW)

#define PAGE_KERNEL	__pgprot(_PAGE_VALID | _PAGE_ASM | _PAGE_KRE | _PAGE_KWE)


#define _PAGE_NORMAL(x) __pgprot(_PAGE_VALID | __ACCESS_BITS | (x))


#define _PAGE_P(x) _PAGE_NORMAL((x) | (((x) & _PAGE_FOW)?0:_PAGE_FOW))

#define _PAGE_S(x) _PAGE_NORMAL(x)

/*
 * The hardware can handle write-only mappings, but as the Alpha
 * architecture does byte-wide writes with a read-modify-write
 * sequence, it's not practical to have write-without-read privs.
 * Thus the "-w- -> rw-" and "-wx -> rwx" mapping here (and in
 * arch/alpha/mm/fault.c)
 */
	/* xwr */

#define __P000	_PAGE_P(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR)

#define __P001	_PAGE_P(_PAGE_FOE | _PAGE_FOW)

#define __P010	_PAGE_P(_PAGE_FOE)

#define __P011	_PAGE_P(_PAGE_FOE)

#define __P100	_PAGE_P(_PAGE_FOW | _PAGE_FOR)

#define __P101	_PAGE_P(_PAGE_FOW)

#define __P110	_PAGE_P(0)

#define __P111	_PAGE_P(0)


#define __S000	_PAGE_S(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR)

#define __S001	_PAGE_S(_PAGE_FOE | _PAGE_FOW)

#define __S010	_PAGE_S(_PAGE_FOE)

#define __S011	_PAGE_S(_PAGE_FOE)

#define __S100	_PAGE_S(_PAGE_FOW | _PAGE_FOR)

#define __S101	_PAGE_S(_PAGE_FOW)

#define __S110	_PAGE_S(0)

#define __S111	_PAGE_S(0)

/*
 * pgprot_noncached() is only for infiniband pci support, and a real
 * implementation for RAM would be more complicated.
 */

#define pgprot_noncached(prot)	(prot)

/*
 * BAD_PAGETABLE is used when we need a bogus page-table, while
 * BAD_PAGE is used for a bogus page.
 *
 * ZERO_PAGE is a global shared page that is always zero:  used
 * for zero-mapped memory areas etc..
 */
extern pte_t __bad_page(void);
extern pmd_t * __bad_pagetable(void);

extern unsigned long __zero_page(void);


#define BAD_PAGETABLE	__bad_pagetable()

#define BAD_PAGE	__bad_page()

#define ZERO_PAGE(vaddr)	(virt_to_page(ZERO_PGE))

/* number of bits that fit into a memory pointer */

#define BITS_PER_PTR			(8*sizeof(unsigned long))

/* to align the pointer to a pointer address */

#define PTR_MASK			(~(sizeof(void*)-1))

/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */

#define SIZEOF_PTR_LOG2			3

/* to find an entry in a page-table */

#define PAGE_PTR(address)		\
  ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)

/*
 * On certain platforms whose physical address space can overlap KSEG,
 * namely EV6 and above, we must re-twiddle the physaddr to restore the
 * correct high-order bits.
 *
 * This is extremely confusing until you realize that this is actually
 * just working around a userspace bug.  The X server was intending to
 * provide the physical address but instead provided the KSEG address.
 * Or tried to, except it's not representable.
 * 
 * On Tsunami there's nothing meaningful at 0x40000000000, so this is
 * a safe thing to do.  Come the first core logic that does put something
 * in this area -- memory or whathaveyou -- then this hack will have
 * to go away.  So be prepared!
 */

#if defined(CONFIG_ALPHA_GENERIC) && defined(USE_48_BIT_KSEG)
#error "EV6-only feature in a generic kernel"
#endif
#if defined(CONFIG_ALPHA_GENERIC) || \
    (defined(CONFIG_ALPHA_EV6) && !defined(USE_48_BIT_KSEG))

#define KSEG_PFN	(0xc0000000000UL >> PAGE_SHIFT)

#define PHYS_TWIDDLE(pfn) \
  ((((pfn) & KSEG_PFN) == (0x40000000000UL >> PAGE_SHIFT)) \
  ? ((pfn) ^= KSEG_PFN) : (pfn))
#else

#define PHYS_TWIDDLE(pfn) (pfn)
#endif

/*
 * Conversion functions:  convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */
#ifndef CONFIG_DISCONTIGMEM

#define page_to_pa(page)	(((page) - mem_map) << PAGE_SHIFT)


#define pte_pfn(pte)	(pte_val(pte) >> 32)

#define pte_page(pte)	pfn_to_page(pte_pfn(pte))

#define mk_pte(page, pgprot)						\
({                                                                      \
        pte_t pte;                                                      \
                                                                        \
        pte_val(pte) = (page_to_pfn(page) << 32) | pgprot_val(pgprot);  \
        pte;                                                            \
})
#endif



extern inline pte_t pfn_pte(unsigned long physpfn, pgprot_t pgprot)
{ pte_t pte; pte_val(pte) = (PHYS_TWIDDLE(physpfn) << 32) | pgprot_val(pgprot); return pte; }

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extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{ pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }

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extern inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
{ pmd_val(*pmdp) = _PAGE_TABLE | ((((unsigned long) ptep) - PAGE_OFFSET) << (32-PAGE_SHIFT)); }

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extern inline void pgd_set(pgd_t * pgdp, pmd_t * pmdp)
{ pgd_val(*pgdp) = _PAGE_TABLE | ((((unsigned long) pmdp) - PAGE_OFFSET) << (32-PAGE_SHIFT)); }


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extern inline unsigned long

pmd_page_vaddr(pmd_t pmd)
{
	return ((pmd_val(pmd) & _PFN_MASK) >> (32-PAGE_SHIFT)) + PAGE_OFFSET;
}

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#ifndef CONFIG_DISCONTIGMEM

#define pmd_page(pmd)	(mem_map + ((pmd_val(pmd) & _PFN_MASK) >> 32))

#define pgd_page(pgd)	(mem_map + ((pgd_val(pgd) & _PFN_MASK) >> 32))
#endif



extern inline unsigned long pgd_page_vaddr(pgd_t pgd)
{ return PAGE_OFFSET + ((pgd_val(pgd) & _PFN_MASK) >> (32-PAGE_SHIFT)); }

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extern inline int pte_none(pte_t pte)		{ return !pte_val(pte); }
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extern inline int pte_present(pte_t pte)	{ return pte_val(pte) & _PAGE_VALID; }
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extern inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
	pte_val(*ptep) = 0;
}

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extern inline int pmd_none(pmd_t pmd)		{ return !pmd_val(pmd); }
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extern inline int pmd_bad(pmd_t pmd)		{ return (pmd_val(pmd) & ~_PFN_MASK) != _PAGE_TABLE; }
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extern inline int pmd_present(pmd_t pmd)	{ return pmd_val(pmd) & _PAGE_VALID; }
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extern inline void pmd_clear(pmd_t * pmdp)	{ pmd_val(*pmdp) = 0; }

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extern inline int pgd_none(pgd_t pgd)		{ return !pgd_val(pgd); }
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extern inline int pgd_bad(pgd_t pgd)		{ return (pgd_val(pgd) & ~_PFN_MASK) != _PAGE_TABLE; }
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extern inline int pgd_present(pgd_t pgd)	{ return pgd_val(pgd) & _PAGE_VALID; }
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extern inline void pgd_clear(pgd_t * pgdp)	{ pgd_val(*pgdp) = 0; }

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/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */


extern inline int pte_write(pte_t pte)		{ return !(pte_val(pte) & _PAGE_FOW); }
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extern inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
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extern inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
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extern inline int pte_special(pte_t pte)	{ return 0; }

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extern inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) |= _PAGE_FOW; return pte; }
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extern inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~(__DIRTY_BITS); return pte; }
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extern inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~(__ACCESS_BITS); return pte; }
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extern inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) &= ~_PAGE_FOW; return pte; }
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extern inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= __DIRTY_BITS; return pte; }
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extern inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= __ACCESS_BITS; return pte; }
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extern inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }

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#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))

/* to find an entry in a kernel page-table-directory */

#define pgd_offset_k(address) pgd_offset(&init_mm, (address))

/* to find an entry in a page-table-directory. */

#define pgd_index(address)	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))

#define pgd_offset(mm, address)	((mm)->pgd+pgd_index(address))

/*
 * The smp_read_barrier_depends() in the following functions are required to
 * order the load of *dir (the pointer in the top level page table) with any
 * subsequent load of the returned pmd_t *ret (ret is data dependent on *dir).
 *
 * If this ordering is not enforced, the CPU might load an older value of
 * *ret, which may be uninitialized data. See mm/memory.c:__pte_alloc for
 * more details.
 *
 * Note that we never change the mm->pgd pointer after the task is running, so
 * pgd_offset does not require such a barrier.
 */

/* Find an entry in the second-level page table.. */


extern inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
{
	pmd_t *ret = (pmd_t *) pgd_page_vaddr(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1));
	smp_read_barrier_depends(); /* see above */
	return ret;
}

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/* Find an entry in the third-level page table.. */


extern inline pte_t * pte_offset_kernel(pmd_t * dir, unsigned long address)
{
	pte_t *ret = (pte_t *) pmd_page_vaddr(*dir)
		+ ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1));
	smp_read_barrier_depends(); /* see above */
	return ret;
}

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#define pte_offset_map(dir,addr)	pte_offset_kernel((dir),(addr))

#define pte_unmap(pte)			do { } while (0)

extern pgd_t swapper_pg_dir[1024];

/*
 * The Alpha doesn't have any external MMU info:  the kernel page
 * tables contain all the necessary information.
 */


extern inline void update_mmu_cache(struct vm_area_struct * vma,
	unsigned long address, pte_t *ptep)
{
}

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/*
 * Non-present pages:  high 24 bits are offset, next 8 bits type,
 * low 32 bits zero.
 */


extern inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
{ pte_t pte; pte_val(pte) = (type << 32) | (offset << 40); return pte; }

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#define __swp_type(x)		(((x).val >> 32) & 0xff)

#define __swp_offset(x)		((x).val >> 40)

#define __swp_entry(type, off)	((swp_entry_t) { pte_val(mk_swap_pte((type), (off))) })

#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })

#define __swp_entry_to_pte(x)	((pte_t) { (x).val })

#ifndef CONFIG_DISCONTIGMEM

#define kern_addr_valid(addr)	(1)
#endif


#define pte_ERROR(e) \
	printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))

#define pmd_ERROR(e) \
	printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))

#define pgd_ERROR(e) \
	printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))

extern void paging_init(void);

#include <asm-generic/pgtable.h>

/*
 * No page table caches to initialise
 */

#define pgtable_cache_init()	do { } while (0)

/* We have our own get_unmapped_area to cope with ADDR_LIMIT_32BIT.  */

#define HAVE_ARCH_UNMAPPED_AREA

#endif /* _ALPHA_PGTABLE_H */
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3.55%
3
5.77%
Ivan Kokshaysky
34
2.32%
3
5.77%
Linus Torvalds
32
2.19%
4
7.69%
Richard Henderson
26
1.78%
1
1.92%
David S. Miller
22
1.50%
1
1.92%
Andrew Morton
14
0.96%
4
7.69%
Dave McCracken
11
0.75%
1
1.92%
Tim Schmielau
6
0.41%
1
1.92%
David Howells
3
0.21%
1
1.92%
Al Viro
3
0.21%
2
3.85%
Russell King
2
0.14%
1
1.92%
Greg Kroah-Hartman
1
0.07%
1
1.92%
Kirill A. Shutemov
1
0.07%
1
1.92%
Hugh Dickins
1
0.07%
1
1.92%
Total
1463
100.00%
52
100.00%
Directory: arch/alpha/include/asm

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