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#ifndef _ARM_RMAP_H
#define _ARM_RMAP_H
/*
* linux/include/asm-arm26/proc-armv/rmap.h
*
* Architecture dependant parts of the reverse mapping code,
*
* ARM is different since hardware page tables are smaller than
* the page size and Linux uses a "duplicate" one with extra info.
* For rmap this means that the first 2 kB of a page are the hardware
* page tables and the last 2 kB are the software page tables.
*/
static inline void pgtable_add_rmap(struct page *page, struct mm_struct * mm, unsigned long address)
{
page->mapping = (void *)mm;
page->index = address & ~((PTRS_PER_PTE * PAGE_SIZE) - 1);
inc_page_state(nr_page_table_pages);
}
static inline void pgtable_remove_rmap(struct page *page)
{
page->mapping = NULL;
page->index = 0;
dec_page_state(nr_page_table_pages);
}
static inline struct mm_struct * ptep_to_mm(pte_t * ptep)
{
struct page * page = virt_to_page(ptep);
return (struct mm_struct *)page->mapping;
}
/* The page table takes half of the page */
#define PTE_MASK ((PAGE_SIZE / 2) - 1)
static inline unsigned long ptep_to_address(pte_t * ptep)
{
struct page * page = virt_to_page(ptep);
unsigned long low_bits;
low_bits = ((unsigned long)ptep & PTE_MASK) * PTRS_PER_PTE;
return page->index + low_bits;
}
//FIXME!!! IS these correct?
static inline pte_addr_t ptep_to_paddr(pte_t *ptep)
{
return (pte_addr_t)ptep;
}
static inline pte_t *rmap_ptep_map(pte_addr_t pte_paddr)
{
return (pte_t *)pte_paddr;
}
static inline void rmap_ptep_unmap(pte_t *pte)
{
return;
}
//#include <asm-generic/rmap.h>
#endif /* _ARM_RMAP_H */
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