Add a library to hold ARM assembler code which is generic across all ARM CPUs. At first it just holds some basic relocation code. The plan is to move more start.S code here.
Signed-off-by: Simon Glass sjg@chromium.org --- Changes in v2: - Invalidate I-cache when we jump to relocated code
arch/arm/lib/Makefile | 2 ++ arch/arm/lib/proc.S | 40 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 42 insertions(+), 0 deletions(-) create mode 100644 arch/arm/lib/proc.S
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile index 300c8fa..213c76f 100644 --- a/arch/arm/lib/Makefile +++ b/arch/arm/lib/Makefile @@ -48,6 +48,8 @@ SOBJS-$(CONFIG_USE_ARCH_MEMSET) += memset.o SOBJS-$(CONFIG_USE_ARCH_MEMCPY) += memcpy.o endif
+SOBJS-y += proc.o + SRCS := $(GLSOBJS:.o=.S) $(GLCOBJS:.o=.c) \ $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c) OBJS := $(addprefix $(obj),$(SOBJS-y) $(COBJS-y)) diff --git a/arch/arm/lib/proc.S b/arch/arm/lib/proc.S new file mode 100644 index 0000000..dba7c11 --- /dev/null +++ b/arch/arm/lib/proc.S @@ -0,0 +1,40 @@ +/* + * Copyright (c) 2011 The Chromium OS Authors. + * 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 + */ + + +/** + * Jump to board_init_r with a new stack pointer + * + * @param gd Pointer to global data + * @param dest_addr Destination address from global data + * @param func Address of board_init_r function (relocated) + * @param sp New stack pointer + */ +.globl proc_call_board_init_r +proc_call_board_init_r: +#ifndef CONFIG_SYS_ICACHE_OFF + mcr p15, 0, r0, c7, c5, 0 @ invalidate icache + mcr p15, 0, r0, c7, c10, 4 @ DSB + mcr p15, 0, r0, c7, c5, 4 @ ISB +#endif + mov sp, r3 + /* jump to it ... */ + mov pc, r2