/* common code for old and new mmaps */
inline long do_mmap2(
unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
int error = -EINVAL;
struct file * file = NULL;
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
/*
* If we are doing a fixed mapping, and address < PAGE_SIZE,
* then deny it.
*/
if (flags & MAP_FIXED && addr < PAGE_SIZE && vectors_base() == 0)
goto out;
error = -EBADF;
if (!(flags & MAP_ANONYMOUS)) {
file = fget(fd);
if (!file)
goto out;
}
down_write(¤t->mm->mmap_sem);
error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
up_write(¤t->mm->mmap_sem);
if (file)
fput(file);
out:
return error;
}
/*
* need to get a 16k page for level 1
*/
pgd_t *get_pgd_slow(struct mm_struct *mm)
{
pgd_t *new_pgd, *init_pgd;
pmd_t *new_pmd, *init_pmd;
pte_t *new_pte, *init_pte;
new_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL, 2);
if (!new_pgd)
goto no_pgd;
memzero(new_pgd, FIRST_KERNEL_PGD_NR * sizeof(pgd_t));
init_pgd = pgd_offset_k(0);
if (vectors_base() == 0) {
init_pmd = pmd_offset(init_pgd, 0);
init_pte = pte_offset(init_pmd, 0);
/*
* This lock is here just to satisfy pmd_alloc and pte_lock
*/
spin_lock(&mm->page_table_lock);
/*
* On ARM, first page must always be allocated since it
* contains the machine vectors.
*/
new_pmd = pmd_alloc(mm, new_pgd, 0);
if (!new_pmd)
goto no_pmd;
new_pte = pte_alloc(mm, new_pmd, 0);
if (!new_pte)
goto no_pte;
set_pte(new_pte, *init_pte);
spin_unlock(&mm->page_table_lock);
}
/*
* Copy over the kernel and IO PGD entries
*/
memcpy(new_pgd + FIRST_KERNEL_PGD_NR, init_pgd + FIRST_KERNEL_PGD_NR,
(PTRS_PER_PGD - FIRST_KERNEL_PGD_NR) * sizeof(pgd_t));
/*
* FIXME: this should not be necessary
*/
clean_cache_area(new_pgd, PTRS_PER_PGD * sizeof(pgd_t));
return new_pgd;
no_pte:
spin_unlock(&mm->page_table_lock);
pmd_free(new_pmd);
free_pages((unsigned long)new_pgd, 2);
return NULL;
no_pmd:
spin_unlock(&mm->page_table_lock);
free_pages((unsigned long)new_pgd, 2);
return NULL;
no_pgd:
return NULL;
}
