C++ (Cpp) movsl_is_ok Examples

Example #1

File: usercopy.c Project: Broadcom/stblinux-2.6.18

unsigned long __copy_to_user_ll(void __user *to, const void *from,
				unsigned long n)
{
	BUG_ON((long) n < 0);
#ifndef CONFIG_X86_WP_WORKS_OK
	if (unlikely(boot_cpu_data.wp_works_ok == 0) &&
			((unsigned long )to) < TASK_SIZE) {
		/* 
		 * CPU does not honor the WP bit when writing
		 * from supervisory mode, and due to preemption or SMP,
		 * the page tables can change at any time.
		 * Do it manually.	Manfred <*****@*****.**>
		 */
		while (n) {
		      	unsigned long offset = ((unsigned long)to)%PAGE_SIZE;
			unsigned long len = PAGE_SIZE - offset;
			int retval;
			struct page *pg;
			void *maddr;
			
			if (len > n)
				len = n;

survive:
			down_read(&current->mm->mmap_sem);
			retval = get_user_pages(current, current->mm,
					(unsigned long )to, 1, 1, 0, &pg, NULL);

			if (retval == -ENOMEM && current->pid == 1) {
				up_read(&current->mm->mmap_sem);
				blk_congestion_wait(WRITE, HZ/50);
				goto survive;
			}

			if (retval != 1) {
				up_read(&current->mm->mmap_sem);
		       		break;
		       	}

			maddr = kmap_atomic(pg, KM_USER0);
			memcpy(maddr + offset, from, len);
			kunmap_atomic(maddr, KM_USER0);
			set_page_dirty_lock(pg);
			put_page(pg);
			up_read(&current->mm->mmap_sem);

			from += len;
			to += len;
			n -= len;
		}
		return n;
	}
#endif
	if (movsl_is_ok(to, from, n))
		__copy_user(to, from, n);
	else
		n = __copy_user_intel(to, from, n);
	return n;
}

Example #2

File: usercopy.c Project: sarnobat/knoppix

unsigned long __copy_from_user_ll(void *to, const void __user *from, unsigned long n)
{
	if (movsl_is_ok(to, from, n))
		__copy_user_zeroing(to, (const void *) from, n);
	else
		n = __copy_user_zeroing_intel(to, (const void *) from, n);
	return n;
}

Example #3

unsigned long __copy_to_user_ll(void __user *to, const void *from,
				unsigned long n)
{
#ifndef CONFIG_X86_WP_WORKS_OK
	if (unlikely(boot_cpu_data.wp_works_ok == 0) &&
			((unsigned long)to) < TASK_SIZE) {
		
		if (in_atomic())
			return n;

		
		while (n) {
			unsigned long offset = ((unsigned long)to)%PAGE_SIZE;
			unsigned long len = PAGE_SIZE - offset;
			int retval;
			struct page *pg;
			void *maddr;

			if (len > n)
				len = n;

survive:
			down_read(&current->mm->mmap_sem);
			retval = get_user_pages(current, current->mm,
					(unsigned long)to, 1, 1, 0, &pg, NULL);

			if (retval == -ENOMEM && is_global_init(current)) {
				up_read(&current->mm->mmap_sem);
				congestion_wait(BLK_RW_ASYNC, HZ/50);
				goto survive;
			}

			if (retval != 1) {
				up_read(&current->mm->mmap_sem);
				break;
			}

			maddr = kmap_atomic(pg, KM_USER0);
			memcpy(maddr + offset, from, len);
			kunmap_atomic(maddr, KM_USER0);
			set_page_dirty_lock(pg);
			put_page(pg);
			up_read(&current->mm->mmap_sem);

			from += len;
			to += len;
			n -= len;
		}
		return n;
	}
#endif
	if (movsl_is_ok(to, from, n))
		__copy_user(to, from, n);
	else
		n = __copy_user_intel(to, from, n);
	return n;
}

Example #4

File: usercopy.c Project: Broadcom/stblinux-2.6.18

unsigned long __copy_from_user_ll_nozero(void *to, const void __user *from,
					 unsigned long n)
{
	BUG_ON((long)n < 0);
	if (movsl_is_ok(to, from, n))
		__copy_user(to, from, n);
	else
		n = __copy_user_intel((void __user *)to,
				      (const void *)from, n);
	return n;
}