static inline int __strncpy_from_user_page(char * to, const char * from,
unsigned long n)
{
unsigned long page, offset, flags;
#ifdef DEBUG_MEMCPY_FROMFS
printk("%s: to: %p, from: %p, len: %08lx\n",
__func__, to, from, n);
#endif
page = parse_ptabs_read((unsigned long)from, &offset, &flags);
if (page != -EFAULT) {
#ifdef DEBUG_MEMCPY_FROMFS
printk(" %s reading from: %08lx len: 0x%lx\n",
__func__, (page + offset), n);
#endif
/* after finishing the copy operation count is either
* - zero: max number of bytes copied or
* - non zero: end of string reached, n containing the
* number of remaining bytes
*/
__do_strncpy_from_user_page(to, (char *)(page + offset), n);
local_irq_restore(flags);
return n;
}
log_efault(__func__, from, to, n);
return -EFAULT;
}
static inline int __clear_user_page(void * address, unsigned long n)
{
unsigned long page, offset;
#ifdef DEBUG_MEMCPY_TOFS
printk("%s: %p, len: %08lx\n", __func__, address, n);
#endif
page = parse_ptabs_write((unsigned long)address, &offset);
if (page != -EFAULT) {
#ifdef DEBUG_MEMCPY_TOFS
printk(" writing to: %08lx\n", (page + offset));
#endif
memset((void *)(page + offset), 0, n);
return 0;
}
log_efault(__func__, address, 0, n);
return -EFAULT;
}
static inline int __copy_from_user_page(void *to, const void *from,
unsigned long n)
{
unsigned long page, offset;
#ifdef DEBUG_MEMCPY_FROMFS
printk("%s to: %p, from: %p, len: %08lx\n", __func__, to, from, n);
#endif
if ((page = parse_ptabs_read((unsigned long)from, &offset)) != -EFAULT) {
#ifdef DEBUG_MEMCPY_FROMFS
printk(" %s reading from: %08lx\n",
__func__, (page + offset));
#endif
memcpy(to, (void *)(page + offset), n);
return 0;
}
log_efault(__func__, from, to, n);
return -EFAULT;
}
static inline int __copy_to_user_page(void *to, const void *from,
unsigned long n)
{
unsigned long page, offset;
#ifdef DEBUG_MEMCPY_TOFS
printk("__copy_to_user_page to: %p, from: %p, len: %08lx\n",
to, from, n);
#endif
if ((page = parse_ptabs_write((unsigned long)to, &offset)) != -EFAULT) {
#ifdef DEBUG_MEMCPY_TOFS
printk(" __copy_to_user_page writing to: %08lx\n",
(page + offset));
#endif
memcpy((void *)(page + offset), from, n);
return 0;
}
log_efault("__copy_to_user_page", to, from, n);
return -EFAULT;
}