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uml: add virt_to_pte

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Turn um_virt_to_phys into virt_to_pte, cleaning up a horrid interface.

It's also made non-static and declared in pgtable.h because it'll be
needed when the stubs get a vma.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2008-02-04 22:30:55 -08:00 committed by Linus Torvalds
parent 655e4ed0c5
commit ca77b555c0
2 changed files with 26 additions and 33 deletions
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56
arch/um/kernel/skas/uaccess.c
View File

@ -13,70 +13,60 @@
#include "kern_util.h"
#include "os.h"
static void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
pte_t *pte_out)
pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
pte_t ptent;
if (task->mm == NULL)
return ERR_PTR(-EINVAL);
pgd = pgd_offset(task->mm, addr);
if (mm == NULL)
return NULL;
pgd = pgd_offset(mm, addr);
if (!pgd_present(*pgd))
return ERR_PTR(-EINVAL);
return NULL;
pud = pud_offset(pgd, addr);
if (!pud_present(*pud))
return ERR_PTR(-EINVAL);
return NULL;
pmd = pmd_offset(pud, addr);
if (!pmd_present(*pmd))
return ERR_PTR(-EINVAL);
return NULL;
pte = pte_offset_kernel(pmd, addr);
ptent = *pte;
if (!pte_present(ptent))
return ERR_PTR(-EINVAL);
if (pte_out != NULL)
*pte_out = ptent;
return (void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK);
return pte_offset_kernel(pmd, addr);
}
static unsigned long maybe_map(unsigned long virt, int is_write)
static pte_t *maybe_map(unsigned long virt, int is_write)
{
pte_t pte;
int err;
pte_t *pte = virt_to_pte(current->mm, virt);
int err, dummy_code;
void *phys = um_virt_to_phys(current, virt, &pte);
int dummy_code;
if (IS_ERR(phys) || (is_write && !pte_write(pte))) {
if ((pte == NULL) || !pte_present(*pte) ||
(is_write && !pte_write(*pte))) {
err = handle_page_fault(virt, 0, is_write, 1, &dummy_code);
if (err)
return -1UL;
phys = um_virt_to_phys(current, virt, NULL);
return NULL;
pte = virt_to_pte(current->mm, virt);
}
if (IS_ERR(phys))
phys = (void *) -1;
if (!pte_present(*pte))
pte = NULL;
return (unsigned long) phys;
return pte;
}
static int do_op_one_page(unsigned long addr, int len, int is_write,
int (*op)(unsigned long addr, int len, void *arg), void *arg)
{
struct page *page;
pte_t *pte;
int n;
addr = maybe_map(addr, is_write);
if (addr == -1UL)
pte = maybe_map(addr, is_write);
if (pte == NULL)
return -1;
page = phys_to_page(addr);
page = pte_page(*pte);
addr = (unsigned long) kmap_atomic(page, KM_UML_USERCOPY) +
(addr & ~PAGE_MASK);

3
include/asm-um/pgtable.h
View File

@ -323,6 +323,9 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
#define pte_unmap(pte) do { } while (0)
#define pte_unmap_nested(pte) do { } while (0)
struct mm_struct;
extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
#define update_mmu_cache(vma,address,pte) do ; while (0)
/* Encode and de-code a swap entry */