[U-Boot] [PATCH v2] ARM: OMAP5: redefine arm_setup_identity_mapping

[Tom Rini]

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On 12/11/12 10:35, Vincent Stehlé wrote:
> We introduce an OMAP5 specific version of 
> arm_setup_identity_mapping(), which makes the first page of the 
> identity mapping invalid.
> 
> We want to unmap the region near address zero on HS OMAP devices, 
> to avoid speculative accesses. Accessing this region causes 
> security violations, which we want to avoid.
> 
> Signed-off-by: Vincent Stehlé <v-stehle at ti.com> Cc: Tom Rini 
> <trini at ti.com> --- Changes for v2: - Fix missing page_table 
> argument - Add extern definition to fix compilation warning
> 
> arch/arm/cpu/armv7/omap5/Makefile     |    1 + 
> arch/arm/cpu/armv7/omap5/cache-cp15.c |   46 
> +++++++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+)
> create mode 100644 arch/arm/cpu/armv7/omap5/cache-cp15.c
> 
> diff --git a/arch/arm/cpu/armv7/omap5/Makefile 
> b/arch/arm/cpu/armv7/omap5/Makefile index 9b261c4..49c454c 100644 
> --- a/arch/arm/cpu/armv7/omap5/Makefile +++ 
> b/arch/arm/cpu/armv7/omap5/Makefile @@ -29,6 +29,7 @@ COBJS	+= 
> hwinit.o COBJS	+= clocks.o COBJS	+= emif.o COBJS	+= sdram.o +COBJS 
> += cache-cp15.o
> 
> SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c) OBJS	:= $(addprefix 
> $(obj),$(COBJS) $(SOBJS)) diff --git 
> a/arch/arm/cpu/armv7/omap5/cache-cp15.c 
> b/arch/arm/cpu/armv7/omap5/cache-cp15.c new file mode 100644 index 
> 0000000..6ff4548 --- /dev/null +++ 
> b/arch/arm/cpu/armv7/omap5/cache-cp15.c @@ -0,0 +1,46 @@ +/* + * 
> (C) Copyright 2002 + * Wolfgang Denk, DENX Software Engineering, 
> wd at denx.de. + * + * (C) Copyright 2012 + * Vincent Stehlé, Texas 
> Instruments, v-stehle at ti.com. + * + * 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 <common.h> + +/* OMAP5 specific
> function to set up the identity mapping. */ +void
> arm_setup_identity_mapping(u32 *page_table) +{ + extern void
> __arm_setup_identity_mapping(u32 *page_table);

Lets put the extern in arch/arm/include/asm/cache.h and make both
files #include <asm/cache.h>.  Thanks!

- -- 
Tom
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