u-boot/arch/arm/cpu/armv7/lowlevel_init.S
Jeroen Hofstee fe1378a961 ARM: use r9 for gd
To be more EABI compliant and as a preparation for building
with clang, use the platform-specific r9 register for gd
instead of r8.

note: The FIQ is not updated since it is not used in u-boot,
and under discussion for the time being.

The following checkpatch warning is ignored:
WARNING: Use of volatile is usually wrong: see
Documentation/volatile-considered-harmful.txt

Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
2013-09-23 18:00:02 +02:00

41 lines
747 B
ArmAsm

/*
* A lowlevel_init function that sets up the stack to call a C function to
* perform further init.
*
* (C) Copyright 2010
* Texas Instruments, <www.ti.com>
*
* Author :
* Aneesh V <aneesh@ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
#include <config.h>
#include <linux/linkage.h>
ENTRY(lowlevel_init)
/*
* Setup a temporary stack
*/
ldr sp, =CONFIG_SYS_INIT_SP_ADDR
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
#ifdef CONFIG_SPL_BUILD
ldr r9, =gdata
#else
sub sp, #GD_SIZE
bic sp, sp, #7
mov r9, sp
#endif
/*
* Save the old lr(passed in ip) and the current lr to stack
*/
push {ip, lr}
/*
* go setup pll, mux, memory
*/
bl s_init
pop {ip, pc}
ENDPROC(lowlevel_init)