diff options
Diffstat (limited to 'lib/romlib/init.s')
| -rw-r--r-- | lib/romlib/init.s | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/lib/romlib/init.s b/lib/romlib/init.s new file mode 100644 index 0000000..2bea15b --- /dev/null +++ b/lib/romlib/init.s @@ -0,0 +1,36 @@ +/* + * Copyright (c) 2018, Arm Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + + .globl rom_lib_init + .extern __DATA_RAM_START__, __DATA_ROM_START__, __DATA_RAM_END__ + .extern memset, memcpy + +rom_lib_init: + cmp w0, #1 + mov w0, #0 + b.le 1f + ret + +1: stp x29, x30, [sp, #-16]! + adrp x0, __DATA_RAM_START__ + adrp x1, __DATA_ROM_START__ + add x1, x1, :lo12:__DATA_ROM_START__ + adrp x2, __DATA_RAM_END__ + add x2, x2, :lo12:__DATA_RAM_END__ + sub x2, x2, x0 + bl memcpy + + adrp x0,__BSS_START__ + add x0, x0, :lo12:__BSS_START__ + mov x1, #0 + adrp x2, __BSS_END__ + add x2, x2, :lo12:__BSS_END__ + sub x2, x2, x0 + bl memset + ldp x29, x30, [sp], #16 + + mov w0, #1 + ret |