From 6f98fc30fdef746a5637e6d0c55ee36c27b0b892 Mon Sep 17 00:00:00 2001 From: Hung-Te Lin Date: Tue, 13 May 2014 22:33:12 +0800 Subject: libpayload: Provide selfboot function. The calling convention of payload entry function is different by architecture. For example, X86 takes no arguments and ARM needs first param to be a cb_header_ptr*. To help payloads load and execute other payloads easily and correctly, we should provide the selfboot() function in libpayload, using same prototype as defined in coreboot environment. BUG=none TEST=emerge-nyan libpayload # pass BRANCH=none Original-Change-Id: I8f1cb2c0df788794b2f6f7f5500a3910328a4f84 Original-Signed-off-by: Hung-Te Lin Original-Reviewed-on: https://chromium-review.googlesource.com/199503 Original-Reviewed-by: Stefan Reinauer (cherry picked from commit 1e916cf021ce68886eb9668982c392eadedc7b7e) Signed-off-by: Marc Jones Change-Id: I7279ef27f49ef581d25a455dd8f1f2f7f1ba58cb Reviewed-on: http://review.coreboot.org/7907 Reviewed-by: Edward O'Callaghan Reviewed-by: Paul Menzel Tested-by: build bot (Jenkins) --- payloads/libpayload/arch/arm/Makefile.inc | 1 + payloads/libpayload/arch/arm/selfboot.c | 35 +++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+) create mode 100644 payloads/libpayload/arch/arm/selfboot.c (limited to 'payloads/libpayload/arch/arm') diff --git a/payloads/libpayload/arch/arm/Makefile.inc b/payloads/libpayload/arch/arm/Makefile.inc index 5c22ea849b..7009884326 100644 --- a/payloads/libpayload/arch/arm/Makefile.inc +++ b/payloads/libpayload/arch/arm/Makefile.inc @@ -38,6 +38,7 @@ libc-y += virtual.c libc-y += memcpy.S memset.S memmove.S libc-y += exception_asm.S exception.c libc-y += cache.c cpu.S +libc-y += selfboot.c libcbfs-$(CONFIG_LP_CBFS) += dummy_media.c # Add other classes here when you put assembly files into them! diff --git a/payloads/libpayload/arch/arm/selfboot.c b/payloads/libpayload/arch/arm/selfboot.c new file mode 100644 index 0000000000..cbb7ef1b51 --- /dev/null +++ b/payloads/libpayload/arch/arm/selfboot.c @@ -0,0 +1,35 @@ +/* + * Copyright 2014 Google Inc. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but without any warranty; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include + +extern void *cb_header_ptr; + +void selfboot(void *entry) +{ + __asm__ __volatile__( + "mov r0, %[cb_header_ptr]\n" + "bx %[entry]\n" + :: [cb_header_ptr]"r"(cb_header_ptr), [entry]"r"(entry) + : "r0" + ); +} -- cgit v1.2.3