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linux/include/asm-alpha/pgtable.h
Hugh Dickins d455a3696c [PATCH] freepgt: arch FIRST_USER_ADDRESS 0 
Replace misleading definition of FIRST_USER_PGD_NR 0 by definition of
FIRST_USER_ADDRESS 0 in all the MMU architectures beyond arm and arm26.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-19 13:29:23 -07:00

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#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/config.h>
#include <linux/mmzone.h>
#include <asm/page.h>
#include <asm/processor.h> /* For TASK_SIZE */
#include <asm/machvec.h>
/* 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 0
/* 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
#define _PAGE_FILE 0x80000 /* set:pagecache, unset:swap */
/*
* 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)
/*
* 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; }
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; }
extern inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
{ pmd_val(*pmdp) = _PAGE_TABLE | ((((unsigned long) ptep) - PAGE_OFFSET) << (32-PAGE_SHIFT)); }
extern inline void pgd_set(pgd_t * pgdp, pmd_t * pmdp)
{ pgd_val(*pgdp) = _PAGE_TABLE | ((((unsigned long) pmdp) - PAGE_OFFSET) << (32-PAGE_SHIFT)); }
extern inline unsigned long
pmd_page_kernel(pmd_t pmd)
{
return ((pmd_val(pmd) & _PFN_MASK) >> (32-PAGE_SHIFT)) + PAGE_OFFSET;
}
#ifndef CONFIG_DISCONTIGMEM
#define pmd_page(pmd) (mem_map + ((pmd_val(pmd) & _PFN_MASK) >> 32))
#endif
extern inline unsigned long pgd_page(pgd_t pgd)
{ return PAGE_OFFSET + ((pgd_val(pgd) & _PFN_MASK) >> (32-PAGE_SHIFT)); }
extern inline int pte_none(pte_t pte) { return !pte_val(pte); }
extern inline int pte_present(pte_t pte) { return pte_val(pte) & _PAGE_VALID; }
extern inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
pte_val(*ptep) = 0;
}
extern inline int pmd_none(pmd_t pmd) { return !pmd_val(pmd); }
extern inline int pmd_bad(pmd_t pmd) { return (pmd_val(pmd) & ~_PFN_MASK) != _PAGE_TABLE; }
extern inline int pmd_present(pmd_t pmd) { return pmd_val(pmd) & _PAGE_VALID; }
extern inline void pmd_clear(pmd_t * pmdp) { pmd_val(*pmdp) = 0; }
extern inline int pgd_none(pgd_t pgd) { return !pgd_val(pgd); }
extern inline int pgd_bad(pgd_t pgd) { return (pgd_val(pgd) & ~_PFN_MASK) != _PAGE_TABLE; }
extern inline int pgd_present(pgd_t pgd) { return pgd_val(pgd) & _PAGE_VALID; }
extern inline void pgd_clear(pgd_t * pgdp) { pgd_val(*pgdp) = 0; }
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
extern inline int pte_read(pte_t pte) { return !(pte_val(pte) & _PAGE_FOR); }
extern inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_FOW); }
extern inline int pte_exec(pte_t pte) { return !(pte_val(pte) & _PAGE_FOE); }
extern inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
extern inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
extern inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOW; return pte; }
extern inline pte_t pte_rdprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOR; return pte; }
extern inline pte_t pte_exprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOE; return pte; }
extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(__DIRTY_BITS); return pte; }
extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~(__ACCESS_BITS); return pte; }
extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_FOW; return pte; }
extern inline pte_t pte_mkread(pte_t pte) { pte_val(pte) &= ~_PAGE_FOR; return pte; }
extern inline pte_t pte_mkexec(pte_t pte) { pte_val(pte) &= ~_PAGE_FOE; return pte; }
extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= __DIRTY_BITS; return pte; }
extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; return pte; }
#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))
/* Find an entry in the second-level page table.. */
extern inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
{
return (pmd_t *) pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1));
}
/* Find an entry in the third-level page table.. */
extern inline pte_t * pte_offset_kernel(pmd_t * dir, unsigned long address)
{
return (pte_t *) pmd_page_kernel(*dir)
+ ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1));
}
#define pte_offset_map(dir,addr) pte_offset_kernel((dir),(addr))
#define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir),(addr))
#define pte_unmap(pte) do { } while (0)
#define pte_unmap_nested(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 pte)
{
}
/*
* 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; }
#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 })
#define pte_to_pgoff(pte) (pte_val(pte) >> 32)
#define pgoff_to_pte(off) ((pte_t) { ((off) << 32) | _PAGE_FILE })
#define PTE_FILE_MAX_BITS 32
#ifndef CONFIG_DISCONTIGMEM
#define kern_addr_valid(addr) (1)
#endif
#define io_remap_page_range(vma, start, busaddr, size, prot) \
({ \
void *va = (void __force *)ioremap(busaddr, size); \
unsigned long pfn = virt_to_phys(va) >> PAGE_SHIFT; \
remap_pfn_range(vma, start, pfn, size, prot); \
})
#define io_remap_pfn_range(vma, start, pfn, size, prot) \
remap_pfn_range(vma, start, pfn, size, prot)
#define MK_IOSPACE_PFN(space, pfn) (pfn)
#define GET_IOSPACE(pfn) 0
#define GET_PFN(pfn) (pfn)
#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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