From c760fc1997e8156ebc4134c42c18f68137c689f9 Mon Sep 17 00:00:00 2001 From: "Hyok S. Choi" Date: Mon, 27 Mar 2006 15:18:50 +0100 Subject: [ARM] nommu: fixups for the exception vectors The high page vector (0xFFFF0000) does not supported in nommu mode. This patch allows the vectors to be 0x00000000 or the begining of DRAM in nommu mode. Signed-off-by: Hyok S. Choi Signed-off-by: Russell King --- arch/arm/Kconfig | 8 ++++++++ arch/arm/Kconfig-nommu | 17 +++++++++++++++++ arch/arm/kernel/signal.h | 2 +- arch/arm/kernel/traps.c | 9 +++++---- 4 files changed, 31 insertions(+), 5 deletions(-) (limited to 'arch') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 32ba00bd0a2..b674614d090 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -72,6 +72,14 @@ config FIQ config ARCH_MTD_XIP bool +config VECTORS_BASE + hex + default 0xffff0000 if MMU + default DRAM_BASE if REMAP_VECTORS_TO_RAM + default 0x00000000 + help + The base address of exception vectors. + source "init/Kconfig" menu "System Type" diff --git a/arch/arm/Kconfig-nommu b/arch/arm/Kconfig-nommu index 8ce56e5bd78..e1574be2ded 100644 --- a/arch/arm/Kconfig-nommu +++ b/arch/arm/Kconfig-nommu @@ -25,3 +25,20 @@ config FLASH_SIZE hex 'FLASH Size' if SET_MEM_PARAM default 0x00400000 +config REMAP_VECTORS_TO_RAM + bool 'Install vectors to the begining of RAM' if DRAM_BASE + depends on DRAM_BASE + help + The kernel needs to change the hardware exception vectors. + In nommu mode, the hardware exception vectors are normally + placed at address 0x00000000. However, this region may be + occupied by read-only memory depending on H/W design. + + If the region contains read-write memory, say 'n' here. + + If your CPU provides a remap facility which allows the exception + vectors to be mapped to writable memory, say 'n' here. + + Otherwise, say 'y' here. In this case, the kernel will require + external support to redirect the hardware exception vectors to + the writable versions located at DRAM_BASE. diff --git a/arch/arm/kernel/signal.h b/arch/arm/kernel/signal.h index 9991049c522..27beece1550 100644 --- a/arch/arm/kernel/signal.h +++ b/arch/arm/kernel/signal.h @@ -7,6 +7,6 @@ * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ -#define KERN_SIGRETURN_CODE 0xffff0500 +#define KERN_SIGRETURN_CODE (CONFIG_VECTORS_BASE + 0x00000500) extern const unsigned long sigreturn_codes[7]; diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 03924bcc612..32b0570329e 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -688,6 +688,7 @@ EXPORT_SYMBOL(abort); void __init trap_init(void) { + unsigned long vectors = CONFIG_VECTORS_BASE; extern char __stubs_start[], __stubs_end[]; extern char __vectors_start[], __vectors_end[]; extern char __kuser_helper_start[], __kuser_helper_end[]; @@ -698,9 +699,9 @@ void __init trap_init(void) * into the vector page, mapped at 0xffff0000, and ensure these * are visible to the instruction stream. */ - memcpy((void *)0xffff0000, __vectors_start, __vectors_end - __vectors_start); - memcpy((void *)0xffff0200, __stubs_start, __stubs_end - __stubs_start); - memcpy((void *)0xffff1000 - kuser_sz, __kuser_helper_start, kuser_sz); + memcpy((void *)vectors, __vectors_start, __vectors_end - __vectors_start); + memcpy((void *)vectors + 0x200, __stubs_start, __stubs_end - __stubs_start); + memcpy((void *)vectors + 0x1000 - kuser_sz, __kuser_helper_start, kuser_sz); /* * Copy signal return handlers into the vector page, and @@ -709,6 +710,6 @@ void __init trap_init(void) memcpy((void *)KERN_SIGRETURN_CODE, sigreturn_codes, sizeof(sigreturn_codes)); - flush_icache_range(0xffff0000, 0xffff0000 + PAGE_SIZE); + flush_icache_range(vectors, vectors + PAGE_SIZE); modify_domain(DOMAIN_USER, DOMAIN_CLIENT); } -- cgit v1.2.3-70-g09d2