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#ifndef _M68K_PGTABLE_H
#define _M68K_PGTABLE_H
#include <linux/config.h>
#include <asm/setup.h>
#ifndef __ASSEMBLY__
#include <asm/processor.h>
#include <linux/threads.h>
/*
* This file contains the functions and defines necessary to modify and use
* the m68k page table tree.
*/
#include <asm/virtconvert.h>
/* Certain architectures need to do special things when pte's
* within a page table are directly modified. Thus, the following
* hook is made available.
*/
#define set_pte(pteptr, pteval) \
do{ \
*(pteptr) = (pteval); \
} while(0)
/* PMD_SHIFT determines the size of the area a second-level page table can map */
#ifdef CONFIG_SUN3
#define PMD_SHIFT 17
#else
#define PMD_SHIFT 22
#endif
#define PMD_SIZE (1UL << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE-1))
/* PGDIR_SHIFT determines what a third-level page table entry can map */
#ifdef CONFIG_SUN3
#define PGDIR_SHIFT 17
#else
#define PGDIR_SHIFT 25
#endif
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
/*
* entries per page directory level: the m68k is configured as three-level,
* so we do have PMD level physically.
*/
#ifdef CONFIG_SUN3
#define PTRS_PER_PTE 16
#define PTRS_PER_PMD 1
#define PTRS_PER_PGD 2048
#else
#define PTRS_PER_PTE 1024
#define PTRS_PER_PMD 8
#define PTRS_PER_PGD 128
#endif
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
#define FIRST_USER_PGD_NR 0
/* Virtual address region for use by kernel_map() */
#ifdef CONFIG_SUN3
#define KMAP_START 0x0DC00000
#define KMAP_END 0x0E000000
#else
#define KMAP_START 0xd0000000
#define KMAP_END 0xf0000000
#endif
#ifndef CONFIG_SUN3
/* Just any arbitrary offset to the start of the vmalloc VM area: the
* current 8MB value just means that there will be a 8MB "hole" after the
* physical memory until the kernel virtual memory starts. That means that
* any out-of-bounds memory accesses will hopefully be caught.
* The vmalloc() routines leaves a hole of 4kB between each vmalloced
* area for the same reason. ;)
*/
#define VMALLOC_OFFSET (8*1024*1024)
#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
#define VMALLOC_VMADDR(x) ((unsigned long)(x))
#define VMALLOC_END KMAP_START
#else
extern unsigned long vmalloc_end;
#define VMALLOC_START 0x0f800000
#define VMALLOC_VMADDR(x) ((unsigned long)(x))
#define VMALLOC_END vmalloc_end
#endif /* CONFIG_SUN3 */
/* zero page used for uninitialized stuff */
extern unsigned long empty_zero_page;
/*
* 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 pte_t * __bad_pagetable(void);
#define BAD_PAGETABLE __bad_pagetable()
#define BAD_PAGE __bad_page()
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
/* 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 */
/* 64-bit machines, beware! SRB. */
#define SIZEOF_PTR_LOG2 2
/*
* Check if the addr/len goes up to the end of a physical
* memory chunk. Used for DMA functions.
*/
#ifdef CONFIG_SINGLE_MEMORY_CHUNK
/*
* It makes no sense to consider whether we cross a memory boundary if
* we support just one physical chunk of memory.
*/
extern inline int mm_end_of_chunk (unsigned long addr, int len)
{
return 0;
}
#else
int mm_end_of_chunk (unsigned long addr, int len);
#endif
extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode);
/*
* The m68k doesn't have any external MMU info: the kernel page
* tables contain all the necessary information. The Sun3 does, but
* they are updated on demand.
*/
extern inline void update_mmu_cache(struct vm_area_struct * vma,
unsigned long address, pte_t pte)
{
}
#ifdef CONFIG_SUN3
/* Macros to (de)construct the fake PTEs representing swap pages. */
#define SWP_TYPE(x) ((x).val & 0x7F)
#define SWP_OFFSET(x) (((x).val) >> 7)
#define SWP_ENTRY(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
#define pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define swp_entry_to_pte(x) ((pte_t) { (x).val })
#else
/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
#define SWP_TYPE(x) (((x).val >> 1) & 0xff)
#define SWP_OFFSET(x) ((x).val >> 10)
#define SWP_ENTRY(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 10) })
#define pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define swp_entry_to_pte(x) ((pte_t) { (x).val })
#endif /* CONFIG_SUN3 */
#endif /* !__ASSEMBLY__ */
/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
#define PageSkip(page) (0)
#define kern_addr_valid(addr) (1)
#define io_remap_page_range remap_page_range
/* MMU-specific headers */
#ifdef CONFIG_SUN3
#include <asm/sun3_pgtable.h>
#else
#include <asm/motorola_pgtable.h>
#endif
#ifndef __ASSEMBLY__
#include <asm-generic/pgtable.h>
#endif /* !__ASSEMBLY__ */
/*
* No page table caches to initialise
*/
#define pgtable_cache_init() do { } while (0)
#endif /* _M68K_PGTABLE_H */
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