2 * Copyright (c) 2008 Semihalf, Rafal Czubak
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <machine/asm.h>
30 #include <machine/armreg.h>
33 * Entry point to the loader that U-Boot passes control to.
38 /* Hint where to look for the API signature */
39 ldr ip, =uboot_address
42 /* Save U-Boot's r8 */
47 mrc p15, 0, r2, c1, c0, 0
48 orr r2, r2, #(CPU_CONTROL_UNAL_ENABLE)
49 orr r2, r2, #(CPU_CONTROL_AFLT_ENABLE)
50 mcr p15, 0, r2, c1, c0, 0
60 /* Save caller's lr and r8 */
64 /* Restore U-Boot's r8 */
66 /* Call into U-Boot */
67 ldr lr, =return_from_syscall
71 /* Restore loader's r8 and lr */
75 /* Return to caller */
92 .long 0 /* U-Boot's r8 */
93 .long 0 /* Loader's r8 */
94 .long 0 /* Loader's lr */