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ARM: renesas: Save boot parameters passed in by ATF

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>
Marek Vasut 5 years ago
parent
commit
4fa8375ffe
1 changed files with 15 additions and 0 deletions
  1. 15 0
      arch/arm/mach-rmobile/lowlevel_init_gen3.S

+ 15 - 0
arch/arm/mach-rmobile/lowlevel_init_gen3.S

@@ -16,6 +16,21 @@
 #include <linux/linkage.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)
 	mov	x29, lr			/* Save LR */