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remarkable-linux/arch/score/include/asm/pgtable.h
Russell King 4b3073e1c5 MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself 
On VIVT ARM, when we have multiple shared mappings of the same file
in the same MM, we need to ensure that we have coherency across all
copies.  We do this via make_coherent() by making the pages
uncacheable.

This used to work fine, until we allowed highmem with highpte - we
now have a page table which is mapped as required, and is not available
for modification via update_mmu_cache().

Ralf Beache suggested getting rid of the PTE value passed to
update_mmu_cache():

  On MIPS update_mmu_cache() calls __update_tlb() which walks pagetables
  to construct a pointer to the pte again.  Passing a pte_t * is much
  more elegant.  Maybe we might even replace the pte argument with the
  pte_t?

Ben Herrenschmidt would also like the pte pointer for PowerPC:

  Passing the ptep in there is exactly what I want.  I want that
  -instead- of the PTE value, because I have issue on some ppc cases,
  for I$/D$ coherency, where set_pte_at() may decide to mask out the
  _PAGE_EXEC.

So, pass in the mapped page table pointer into update_mmu_cache(), and
remove the PTE value, updating all implementations and call sites to
suit.

Includes a fix from Stephen Rothwell:

  sparc: fix fallout from update_mmu_cache API change

  Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-20 16:41:46 +00:00

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#ifndef _ASM_SCORE_PGTABLE_H
#define _ASM_SCORE_PGTABLE_H
#include <linux/const.h>
#include <asm-generic/pgtable-nopmd.h>
#include <asm/fixmap.h>
#include <asm/setup.h>
#include <asm/pgtable-bits.h>
extern void load_pgd(unsigned long pg_dir);
extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
/* PGDIR_SHIFT determines what a third-level page table entry can map */
#define PGDIR_SHIFT 22
#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE - 1))
/*
* Entries per page directory level: we use two-level, so
* we don't really have any PUD/PMD directory physically.
*/
#define PGD_ORDER 0
#define PTE_ORDER 0
#define PTRS_PER_PGD 1024
#define PTRS_PER_PTE 1024
#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define VMALLOC_START (0xc0000000UL)
#define PKMAP_BASE (0xfd000000UL)
#define VMALLOC_END (FIXADDR_START - 2*PAGE_SIZE)
#define pte_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
__FILE__, __LINE__, pte_val(e))
#define pgd_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
__FILE__, __LINE__, pgd_val(e))
/*
* Empty pgd/pmd entries point to the invalid_pte_table.
*/
static inline int pmd_none(pmd_t pmd)
{
return pmd_val(pmd) == (unsigned long) invalid_pte_table;
}
#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
static inline int pmd_present(pmd_t pmd)
{
return pmd_val(pmd) != (unsigned long) invalid_pte_table;
}
static inline void pmd_clear(pmd_t *pmdp)
{
pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
}
#define pte_page(x) pfn_to_page(pte_pfn(x))
#define pte_pfn(x) ((unsigned long)((x).pte >> PAGE_SHIFT))
#define pfn_pte(pfn, prot) \
__pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define __pgd_offset(address) pgd_index(address)
#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
#define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
/* to find an entry in a page-table-directory */
#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
/* Find an entry in the third-level page table.. */
#define __pte_offset(address) \
(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset(dir, address) \
((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
#define pte_offset_kernel(dir, address) \
((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
#define pte_offset_map(dir, address) \
((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
#define pte_offset_map_nested(dir, address) \
((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
#define pte_unmap(pte) ((void)(pte))
#define pte_unmap_nested(pte) ((void)(pte))
/*
* Bits 9(_PAGE_PRESENT) and 10(_PAGE_FILE)are taken,
* split up 30 bits of offset into this range:
*/
#define PTE_FILE_MAX_BITS 30
#define pte_to_pgoff(_pte) \
(((_pte).pte & 0x1ff) | (((_pte).pte >> 11) << 9))
#define pgoff_to_pte(off) \
((pte_t) {((off) & 0x1ff) | (((off) >> 9) << 11) | _PAGE_FILE})
#define __pte_to_swp_entry(pte) \
((swp_entry_t) { pte_val(pte)})
#define __swp_entry_to_pte(x) ((pte_t) {(x).val})
#define pmd_phys(pmd) __pa((void *)pmd_val(pmd))
#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
#define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot)
static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
#define pte_clear(mm, addr, xp) \
do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
remap_pfn_range(vma, vaddr, pfn, size, prot)
/*
* The "pgd_xxx()" functions here are trivial for a folded two-level
* setup: the pgd is never bad, and a pmd always exists (as it's folded
* into the pgd entry)
*/
#define pgd_present(pgd) (1)
#define pgd_none(pgd) (0)
#define pgd_bad(pgd) (0)
#define pgd_clear(pgdp) do { } while (0)
#define kern_addr_valid(addr) (1)
#define pmd_page_vaddr(pmd) pmd_val(pmd)
#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
#define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_CACHE)
#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
_PAGE_CACHE)
#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
_PAGE_GLOBAL | _PAGE_CACHE)
#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
__WRITEABLE | _PAGE_GLOBAL & ~_PAGE_CACHE)
#define __P000 PAGE_NONE
#define __P001 PAGE_READONLY
#define __P010 PAGE_COPY
#define __P011 PAGE_COPY
#define __P100 PAGE_READONLY
#define __P101 PAGE_READONLY
#define __P110 PAGE_COPY
#define __P111 PAGE_COPY
#define __S000 PAGE_NONE
#define __S001 PAGE_READONLY
#define __S010 PAGE_SHARED
#define __S011 PAGE_SHARED
#define __S100 PAGE_READONLY
#define __S101 PAGE_READONLY
#define __S110 PAGE_SHARED
#define __S111 PAGE_SHARED
#define pgprot_noncached pgprot_noncached
static inline pgprot_t pgprot_noncached(pgprot_t _prot)
{
unsigned long prot = pgprot_val(_prot);
prot = (prot & ~_CACHE_MASK);
return __pgprot(prot);
}
#define __swp_type(x) ((x).val & 0x1f)
#define __swp_offset(x) ((x).val >> 11)
#define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 11)})
extern unsigned long empty_zero_page;
extern unsigned long zero_page_mask;
#define ZERO_PAGE(vaddr) \
(virt_to_page((void *)(empty_zero_page + \
(((unsigned long)(vaddr)) & zero_page_mask))))
#define pgtable_cache_init() do {} while (0)
#define arch_enter_lazy_cpu_mode() do {} while (0)
static inline int pte_write(pte_t pte)
{
return pte_val(pte) & _PAGE_WRITE;
}
static inline int pte_dirty(pte_t pte)
{
return pte_val(pte) & _PAGE_MODIFIED;
}
static inline int pte_young(pte_t pte)
{
return pte_val(pte) & _PAGE_ACCESSED;
}
static inline int pte_file(pte_t pte)
{
return pte_val(pte) & _PAGE_FILE;
}
#define pte_special(pte) (0)
static inline pte_t pte_wrprotect(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
return pte;
}
static inline pte_t pte_mkclean(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
return pte;
}
static inline pte_t pte_mkold(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
return pte;
}
static inline pte_t pte_mkwrite(pte_t pte)
{
pte_val(pte) |= _PAGE_WRITE;
if (pte_val(pte) & _PAGE_MODIFIED)
pte_val(pte) |= _PAGE_SILENT_WRITE;
return pte;
}
static inline pte_t pte_mkdirty(pte_t pte)
{
pte_val(pte) |= _PAGE_MODIFIED;
if (pte_val(pte) & _PAGE_WRITE)
pte_val(pte) |= _PAGE_SILENT_WRITE;
return pte;
}
static inline pte_t pte_mkyoung(pte_t pte)
{
pte_val(pte) |= _PAGE_ACCESSED;
if (pte_val(pte) & _PAGE_READ)
pte_val(pte) |= _PAGE_SILENT_READ;
return pte;
}
#define set_pmd(pmdptr, pmdval) \
do { *(pmdptr) = (pmdval); } while (0)
#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
extern unsigned long pgd_current;
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
extern void paging_init(void);
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
}
extern void __update_tlb(struct vm_area_struct *vma,
unsigned long address, pte_t pte);
extern void __update_cache(struct vm_area_struct *vma,
unsigned long address, pte_t pte);
static inline void update_mmu_cache(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
{
pte_t pte = *ptep;
__update_tlb(vma, address, pte);
__update_cache(vma, address, pte);
}
#ifndef __ASSEMBLY__
#include <asm-generic/pgtable.h>
void setup_memory(void);
#endif /* __ASSEMBLY__ */
#endif /* _ASM_SCORE_PGTABLE_H */
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