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/*
* Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
*/
#ifndef _CF_PGTABLE_H
#define _CF_PGTABLE_H
#include <asm/cfmmu.h>
#include <asm/page.h>
#ifndef __ASSEMBLY__
#include <asm/virtconvert.h>
#include <linux/linkage.h>
/* For virtual address to physical address conversion */
#define VTOP(addr) __pa(addr)
#define PTOV(addr) __va(addr)
#endif /* !__ASSEMBLY__ */
/* Page protection values within PTE. */
/* MMUDR bits, in proper place. */
#define CF_PAGE_LOCKED (0x00000002)
#define CF_PAGE_EXEC (0x00000004)
#define CF_PAGE_WRITABLE (0x00000008)
#define CF_PAGE_READABLE (0x00000010)
#define CF_PAGE_SYSTEM (0x00000020)
#define CF_PAGE_COPYBACK (0x00000040)
#define CF_PAGE_NOCACHE (0x00000080)
#define CF_CACHEMASK (~0x00000040)
#define CF_PAGE_MMUDR_MASK (0x000000fe)
#define _PAGE_NOCACHE030 (CF_PAGE_NOCACHE)
/* MMUTR bits, need shifting down. */
#define CF_PAGE_VALID (0x00000400)
#define CF_PAGE_SHARED (0x00000800)
#define CF_PAGE_MMUTR_MASK (0x00000c00)
#define CF_PAGE_MMUTR_SHIFT (10)
#define CF_ASID_MMU_SHIFT (2)
/* Fake bits, not implemented in CF, will get masked out before
hitting hardware, and might go away altogether once this port is
complete. */
#if PAGE_SHIFT < 13
#error COLDFIRE Error: Pages must be at least 8k in size
#endif
#define CF_PAGE_ACCESSED (0x00001000)
#define CF_PAGE_FILE (0x00000200)
#define CF_PAGE_DIRTY (0x00000001)
#define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */
#define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */
#define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */
#define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */
#define _DESCTYPE_MASK 0x003
#define _CACHEMASK040 (~0x060)
#define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */
/* Externally used page protection values. */
#define _PAGE_PRESENT (CF_PAGE_VALID)
#define _PAGE_ACCESSED (CF_PAGE_ACCESSED)
#define _PAGE_DIRTY (CF_PAGE_DIRTY)
#define _PAGE_READWRITE (CF_PAGE_WRITABLE \
| CF_PAGE_READABLE \
| CF_PAGE_SHARED \
| CF_PAGE_SYSTEM)
/* Compound page protection values. */
#define PAGE_NONE __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED)
#define PAGE_SHARED __pgprot(CF_PAGE_VALID \
| CF_PAGE_READABLE \
| CF_PAGE_WRITABLE \
| CF_PAGE_ACCESSED)
#define PAGE_INIT __pgprot(CF_PAGE_VALID \
| CF_PAGE_WRITABLE \
| CF_PAGE_READABLE \
| CF_PAGE_EXEC \
| CF_PAGE_SYSTEM \
| CF_PAGE_SHARED)
#define PAGE_KERNEL __pgprot(CF_PAGE_VALID \
| CF_PAGE_WRITABLE \
| CF_PAGE_READABLE \
| CF_PAGE_EXEC \
| CF_PAGE_SYSTEM \
| CF_PAGE_SHARED \
| CF_PAGE_ACCESSED)
#define PAGE_COPY __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE)
/*
* Page protections for initialising protection_map. See mm/mmap.c
* for use. In general, the bit positions are xwr, and P-items are
* private, the S-items are shared.
*/
#define __P000 PAGE_NONE
#define __P100 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_EXEC)
#define __P010 __pgprot(CF_PAGE_VALID \
| CF_PAGE_WRITABLE \
| CF_PAGE_ACCESSED)
#define __P110 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_WRITABLE \
| CF_PAGE_EXEC)
#define __P001 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE)
#define __P101 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_EXEC)
#define __P011 __pgprot(CF_PAGE_VALID \
| CF_PAGE_READABLE \
| CF_PAGE_WRITABLE \
| CF_PAGE_ACCESSED)
#define __P111 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_WRITABLE \
| CF_PAGE_READABLE \
| CF_PAGE_EXEC)
#define __S000 PAGE_NONE
#define __S100 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_EXEC)
#define __S010 PAGE_SHARED
#define __S110 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_WRITABLE \
| CF_PAGE_EXEC)
#define __S001 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE)
#define __S101 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_EXEC)
#define __S011 PAGE_SHARED
#define __S111 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_WRITABLE \
| CF_PAGE_EXEC)
#define PTE_MASK PAGE_MASK
#define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
#ifndef __ASSEMBLY__
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*/
#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
return pte;
}
#define pmd_set(pmdp, ptep) do {} while (0)
static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
{
pgd_val(*pgdp) = virt_to_phys(pmdp);
}
#define __pte_page(pte) \
((unsigned long) ((pte_val(pte) & CF_PAGE_PGNUM_MASK) + PAGE_OFFSET))
#define __pmd_page(pmd) ((unsigned long) (pmd_val(pmd)))
extern inline int pte_none(pte_t pte)
{
return !pte_val(pte);
}
extern inline int pte_present(pte_t pte)
{
return pte_val(pte) & CF_PAGE_VALID;
}
extern inline void pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
pte_val(*ptep) = 0;
}
#define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
#define pte_page(pte) virt_to_page(__pte_page(pte))
extern inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
#define pmd_none(pmd) pmd_none2(&(pmd))
extern inline int pmd_bad2(pmd_t *pmd) { return 0; }
#define pmd_bad(pmd) pmd_bad2(&(pmd))
#define pmd_present(pmd) (!pmd_none2(&(pmd)))
extern inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
extern inline int pgd_none(pgd_t pgd) { return 0; }
extern inline int pgd_bad(pgd_t pgd) { return 0; }
extern inline int pgd_present(pgd_t pgd) { return 1; }
extern inline void pgd_clear(pgd_t *pgdp) {}
#define pte_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
__FILE__, __LINE__, pte_val(e))
#define pmd_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pmd %08lx.\n", \
__FILE__, __LINE__, pmd_val(e))
#define pgd_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
__FILE__, __LINE__, pgd_val(e))
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not...
* [we have the full set here even if they don't change from m68k]
*/
extern inline int pte_read(pte_t pte) \
{ return pte_val(pte) & CF_PAGE_READABLE; }
extern inline int pte_write(pte_t pte) \
{ return pte_val(pte) & CF_PAGE_WRITABLE; }
extern inline int pte_exec(pte_t pte) \
{ return pte_val(pte) & CF_PAGE_EXEC; }
extern inline int pte_dirty(pte_t pte) \
{ return pte_val(pte) & CF_PAGE_DIRTY; }
extern inline int pte_young(pte_t pte) \
{ return pte_val(pte) & CF_PAGE_ACCESSED; }
extern inline int pte_file(pte_t pte) \
{ return pte_val(pte) & CF_PAGE_FILE; }
static inline int pte_special(pte_t pte) { return 0; }
extern inline pte_t pte_wrprotect(pte_t pte) \
{ pte_val(pte) &= ~CF_PAGE_WRITABLE; return pte; }
extern inline pte_t pte_rdprotect(pte_t pte) \
{ pte_val(pte) &= ~CF_PAGE_READABLE; return pte; }
extern inline pte_t pte_exprotect(pte_t pte) \
{ pte_val(pte) &= ~CF_PAGE_EXEC; return pte; }
extern inline pte_t pte_mkclean(pte_t pte) \
{ pte_val(pte) &= ~CF_PAGE_DIRTY; return pte; }
extern inline pte_t pte_mkold(pte_t pte) \
{ pte_val(pte) &= ~CF_PAGE_ACCESSED; return pte; }
extern inline pte_t pte_mkwrite(pte_t pte) \
{ pte_val(pte) |= CF_PAGE_WRITABLE; return pte; }
extern inline pte_t pte_mkread(pte_t pte) \
{ pte_val(pte) |= CF_PAGE_READABLE; return pte; }
extern inline pte_t pte_mkexec(pte_t pte) \
{ pte_val(pte) |= CF_PAGE_EXEC; return pte; }
extern inline pte_t pte_mkdirty(pte_t pte) \
{ pte_val(pte) |= CF_PAGE_DIRTY; return pte; }
extern inline pte_t pte_mkyoung(pte_t pte) \
{ pte_val(pte) |= CF_PAGE_ACCESSED; return pte; }
extern inline pte_t pte_mknocache(pte_t pte) \
{ pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40); return pte; }
extern inline pte_t pte_mkcache(pte_t pte) \
{ pte_val(pte) &= ~CF_PAGE_NOCACHE; return pte; }
static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
#define swapper_pg_dir kernel_pg_dir
extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
/* Find an entry in a pagetable directory. */
#define pgd_index(address) ((address) >> PGDIR_SHIFT)
#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
/* Find an entry in a kernel pagetable directory. */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
/* Find an entry in the second-level pagetable. */
extern inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address)
{
return (pmd_t *) pgd;
}
/* Find an entry in the third-level pagetable. */
#define __pte_offset(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset_kernel(dir, address) ((pte_t *) __pmd_page(*(dir)) + \
__pte_offset(address))
/* Disable caching for page at given kernel virtual address. */
static inline void nocache_page(void *vaddr)
{
pgd_t *dir;
pmd_t *pmdp;
pte_t *ptep;
unsigned long addr = (unsigned long)vaddr;
dir = pgd_offset_k(addr);
pmdp = pmd_offset(dir, addr);
ptep = pte_offset_kernel(pmdp, addr);
*ptep = pte_mknocache(*ptep);
}
/* Enable caching for page at given kernel virtual address. */
static inline void cache_page(void *vaddr)
{
pgd_t *dir;
pmd_t *pmdp;
pte_t *ptep;
unsigned long addr = (unsigned long)vaddr;
dir = pgd_offset_k(addr);
pmdp = pmd_offset(dir, addr);
ptep = pte_offset_kernel(pmdp, addr);
*ptep = pte_mkcache(*ptep);
}
#define PTE_FILE_MAX_BITS 21
#define PTE_FILE_SHIFT 11
static inline unsigned long pte_to_pgoff(pte_t pte)
{
return pte_val(pte) >> PTE_FILE_SHIFT;
}
static inline pte_t pgoff_to_pte(unsigned pgoff)
{
pte_t pte = __pte((pgoff << PTE_FILE_SHIFT) + CF_PAGE_FILE);
return pte;
}
/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
#define __swp_entry(type, offset) ((swp_entry_t) { (type) | \
(offset << PTE_FILE_SHIFT) })
#define __swp_type(x) ((x).val & 0xFF)
#define __swp_offset(x) ((x).val >> PTE_FILE_SHIFT)
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x) (__pte((x).val))
#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
#define pte_offset_map(pmdp, address) ((pte_t *)__pmd_page(*pmdp) + \
__pte_offset(address))
#define pte_offset_map_nested(pmdp, address) pte_offset_map(pmdp, address)
#define pte_unmap(pte) kunmap(pte)
#define pte_unmap_nested(pte) kunmap(pte)
#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
#endif /* !__ASSEMBLY__ */
#endif /* !_CF_PGTABLE_H */
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