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ARM: renesas: Save boot parameters passed in by ATF

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The ATF can pass additional information via the first four registers,
x0...x3. The R-Car Gen3 with mainline ATF, register x1 contains pointer
to a device tree with platform information. Save these registers for
future use.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
This commit is contained in:
Marek Vasut 2018-10-18 18:38:05 +02:00 committed by Marek Vasut
parent 118f4d4559
commit 4fa8375ffe
1 changed files with 15 additions and 0 deletions
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15
arch/arm/mach-rmobile/lowlevel_init_gen3.S
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@ -16,6 +16,21 @@
#include <linux/linkage.h> #include <linux/linkage.h>
#include <asm/macro.h> #include <asm/macro.h>
.align 8
.globl rcar_atf_boot_args
rcar_atf_boot_args:
.dword 0
.dword 0
.dword 0
.dword 0
ENTRY(save_boot_params)
adr x8, rcar_atf_boot_args
stp x0, x1, [x8], #16
stp x2, x3, [x8], #16
b save_boot_params_ret
ENDPROC(save_boot_params)
ENTRY(lowlevel_init) ENTRY(lowlevel_init)
mov x29, lr /* Save LR */ mov x29, lr /* Save LR */