Add code necessary for correct initialization of exception vector table when MMU is disabled.
Note: Only ARMv7 support is implemented Signed-off-by: Andrey Smirnov <[email protected]> --- Changes since v1 (http://lists.infradead.org/pipermail/barebox/2015-December/025685.html): - Check CPU architecture at runtime - Remove untested code for ARMv5 --- arch/arm/cpu/Makefile | 6 +++++ arch/arm/cpu/no-mmu.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 69 insertions(+) create mode 100644 arch/arm/cpu/no-mmu.c diff --git a/arch/arm/cpu/Makefile b/arch/arm/cpu/Makefile index 418bcab..f708e8f 100644 --- a/arch/arm/cpu/Makefile +++ b/arch/arm/cpu/Makefile @@ -11,6 +11,12 @@ obj-$(CONFIG_CMD_ARM_MMUINFO) += mmuinfo.o obj-$(CONFIG_OFDEVICE) += dtb.o obj-$(CONFIG_MMU) += mmu.o cache.o mmu-early.o pbl-$(CONFIG_MMU) += mmu-early.o + +ifeq ($(CONFIG_MMU),) +obj-y += no-mmu.o +pbl-y += no-mmu.o +endif + obj-$(CONFIG_CPU_32v4T) += cache-armv4.o pbl-$(CONFIG_CPU_32v4T) += cache-armv4.o obj-$(CONFIG_CPU_32v5) += cache-armv5.o diff --git a/arch/arm/cpu/no-mmu.c b/arch/arm/cpu/no-mmu.c new file mode 100644 index 0000000..4da053f --- /dev/null +++ b/arch/arm/cpu/no-mmu.c @@ -0,0 +1,63 @@ +/* + * Copyright (c) 2015 Zodiac Inflight Innovation + * Author: Andrey Smirnov <[email protected]> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * 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. + * + */ + +#define pr_fmt(fmt) "nommu: " fmt + +#include <common.h> +#include <dma-dir.h> +#include <init.h> +#include <mmu.h> +#include <errno.h> +#include <linux/sizes.h> +#include <asm/memory.h> +#include <asm/barebox-arm.h> +#include <asm/system.h> +#include <asm/cache.h> +#include <memory.h> +#include <asm/system_info.h> +#include <debug_ll.h> + + +#define __exceptions_size (__exceptions_stop - __exceptions_start) + +static int nommu_v7_vectors_init(void) +{ + if (cpu_architecture() < CPU_ARCH_ARMv7) + return 0; + + + void *vectors; + u32 cr; + + + /* + * High vectors cannot be re-mapped, so we have to use normal + * vectors + */ + cr = get_cr(); + cr &= ~CR_V; + set_cr(cr); + + arm_fixup_vectors(); + + vectors = xmemalign(PAGE_SIZE, PAGE_SIZE); + memset(vectors, 0, PAGE_SIZE); + memcpy(vectors, __exceptions_start, __exceptions_size); + + set_vbar((unsigned int)vectors); + + return 0; +} +mmu_initcall(nommu_v7_vectors_init); -- 2.5.0 _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
