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)
{
jmp_buf buf;
struct page *page;
pte_t *pte;
int n, faulted;
pte = maybe_map(addr, is_write);
if (pte == NULL)
return -1;
page = pte_page(*pte);
addr = (unsigned long) kmap_atomic(page, KM_UML_USERCOPY) +
(addr & ~PAGE_MASK);
current->thread.fault_catcher = &buf;
faulted = UML_SETJMP(&buf);
if (faulted == 0)
n = (*op)(addr, len, arg);
else
n = -1;
current->thread.fault_catcher = NULL;
kunmap_atomic(page, KM_UML_USERCOPY);
return n;
}
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)
{
jmp_buf buf;
struct page *page;
pte_t *pte;
int n;
pte = maybe_map(addr, is_write);
if (pte == NULL)
return -1;
page = pte_page(*pte);
#ifdef CONFIG_64BIT
pagefault_disable();
addr = (unsigned long) page_address(page) +
(addr & ~PAGE_MASK);
#else
addr = (unsigned long) kmap_atomic(page) +
(addr & ~PAGE_MASK);
#endif
n = (*op)(addr, len, arg);
#ifdef CONFIG_64BIT
pagefault_enable();
#else
kunmap_atomic((void *)addr);
#endif
return n;
}
static int do_op(unsigned long addr, int len, int is_write,
int (*op)(unsigned long addr, int len, void *arg), void *arg)
{
struct page *page;
int n;
addr = maybe_map(addr, is_write);
if(addr == -1UL)
return(-1);
page = phys_to_page(addr);
addr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
n = (*op)(addr, len, arg);
kunmap(page);
return(n);
}
