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s390: implement pte special bit

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Convert XIP to support non-struct page backed memory, using VM_MIXEDMAP for
the user mappings.

This requires the get_xip_page API to be changed to an address based one.
Improve the API layering a little bit too, while we're here.

This is required in order to support XIP filesystems on memory that isn't
backed with struct page (but memory with struct page is still supported too).

Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: Carsten Otte <cotte@de.ibm.com>
Cc: Jared Hulbert <jaredeh@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin 2008-04-28 02:13:03 -07:00 committed by Linus Torvalds
parent 70688e4dd1
commit a08cb629f5
1 changed files with 4 additions and 1 deletions
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5
include/asm-s390/pgtable.h
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@ -220,6 +220,8 @@ extern char empty_zero_page[PAGE_SIZE];
/* Software bits in the page table entry */
#define _PAGE_SWT 0x001 /* SW pte type bit t */
#define _PAGE_SWX 0x002 /* SW pte type bit x */
#define _PAGE_SPECIAL 0x004 /* SW associated with special page */
#define __HAVE_ARCH_PTE_SPECIAL
/* Six different types of pages. */
#define _PAGE_TYPE_EMPTY 0x400
@ -520,7 +522,7 @@ static inline int pte_file(pte_t pte)
static inline int pte_special(pte_t pte)
{
return 0;
return (pte_val(pte) & _PAGE_SPECIAL);
}
#define __HAVE_ARCH_PTE_SAME
@ -722,6 +724,7 @@ static inline pte_t pte_mkyoung(pte_t pte)
static inline pte_t pte_mkspecial(pte_t pte)
{
pte_val(pte) |= _PAGE_SPECIAL;
return pte;
}