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authorHyok S. Choi <hyok.choi@samsung.com>2006-03-27 09:18:50 -0500
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-03-27 09:18:50 -0500
commitc760fc1997e8156ebc4134c42c18f68137c689f9 (patch)
treed7ab9b7b93c8d6829a7d2b6d972b8405256d04d0
parentf8c07de6beac55c3273cbd679bfa67555ef14ef5 (diff)
[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 <hyok.choi@samsung.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/Kconfig8
-rw-r--r--arch/arm/Kconfig-nommu17
-rw-r--r--arch/arm/kernel/signal.h2
-rw-r--r--arch/arm/kernel/traps.c9
4 files changed, 31 insertions, 5 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 32ba00bd0a2f..b674614d090b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -72,6 +72,14 @@ config FIQ
72config ARCH_MTD_XIP 72config ARCH_MTD_XIP
73 bool 73 bool
74 74
75config VECTORS_BASE
76 hex
77 default 0xffff0000 if MMU
78 default DRAM_BASE if REMAP_VECTORS_TO_RAM
79 default 0x00000000
80 help
81 The base address of exception vectors.
82
75source "init/Kconfig" 83source "init/Kconfig"
76 84
77menu "System Type" 85menu "System Type"
diff --git a/arch/arm/Kconfig-nommu b/arch/arm/Kconfig-nommu
index 8ce56e5bd78f..e1574be2ded6 100644
--- a/arch/arm/Kconfig-nommu
+++ b/arch/arm/Kconfig-nommu
@@ -25,3 +25,20 @@ config FLASH_SIZE
25 hex 'FLASH Size' if SET_MEM_PARAM 25 hex 'FLASH Size' if SET_MEM_PARAM
26 default 0x00400000 26 default 0x00400000
27 27
28config REMAP_VECTORS_TO_RAM
29 bool 'Install vectors to the begining of RAM' if DRAM_BASE
30 depends on DRAM_BASE
31 help
32 The kernel needs to change the hardware exception vectors.
33 In nommu mode, the hardware exception vectors are normally
34 placed at address 0x00000000. However, this region may be
35 occupied by read-only memory depending on H/W design.
36
37 If the region contains read-write memory, say 'n' here.
38
39 If your CPU provides a remap facility which allows the exception
40 vectors to be mapped to writable memory, say 'n' here.
41
42 Otherwise, say 'y' here. In this case, the kernel will require
43 external support to redirect the hardware exception vectors to
44 the writable versions located at DRAM_BASE.
diff --git a/arch/arm/kernel/signal.h b/arch/arm/kernel/signal.h
index 9991049c522d..27beece15502 100644
--- a/arch/arm/kernel/signal.h
+++ b/arch/arm/kernel/signal.h
@@ -7,6 +7,6 @@
7 * it under the terms of the GNU General Public License version 2 as 7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation. 8 * published by the Free Software Foundation.
9 */ 9 */
10#define KERN_SIGRETURN_CODE 0xffff0500 10#define KERN_SIGRETURN_CODE (CONFIG_VECTORS_BASE + 0x00000500)
11 11
12extern const unsigned long sigreturn_codes[7]; 12extern const unsigned long sigreturn_codes[7];
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 03924bcc6129..32b0570329e7 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -688,6 +688,7 @@ EXPORT_SYMBOL(abort);
688 688
689void __init trap_init(void) 689void __init trap_init(void)
690{ 690{
691 unsigned long vectors = CONFIG_VECTORS_BASE;
691 extern char __stubs_start[], __stubs_end[]; 692 extern char __stubs_start[], __stubs_end[];
692 extern char __vectors_start[], __vectors_end[]; 693 extern char __vectors_start[], __vectors_end[];
693 extern char __kuser_helper_start[], __kuser_helper_end[]; 694 extern char __kuser_helper_start[], __kuser_helper_end[];
@@ -698,9 +699,9 @@ void __init trap_init(void)
698 * into the vector page, mapped at 0xffff0000, and ensure these 699 * into the vector page, mapped at 0xffff0000, and ensure these
699 * are visible to the instruction stream. 700 * are visible to the instruction stream.
700 */ 701 */
701 memcpy((void *)0xffff0000, __vectors_start, __vectors_end - __vectors_start); 702 memcpy((void *)vectors, __vectors_start, __vectors_end - __vectors_start);
702 memcpy((void *)0xffff0200, __stubs_start, __stubs_end - __stubs_start); 703 memcpy((void *)vectors + 0x200, __stubs_start, __stubs_end - __stubs_start);
703 memcpy((void *)0xffff1000 - kuser_sz, __kuser_helper_start, kuser_sz); 704 memcpy((void *)vectors + 0x1000 - kuser_sz, __kuser_helper_start, kuser_sz);
704 705
705 /* 706 /*
706 * Copy signal return handlers into the vector page, and 707 * Copy signal return handlers into the vector page, and
@@ -709,6 +710,6 @@ void __init trap_init(void)
709 memcpy((void *)KERN_SIGRETURN_CODE, sigreturn_codes, 710 memcpy((void *)KERN_SIGRETURN_CODE, sigreturn_codes,
710 sizeof(sigreturn_codes)); 711 sizeof(sigreturn_codes));
711 712
712 flush_icache_range(0xffff0000, 0xffff0000 + PAGE_SIZE); 713 flush_icache_range(vectors, vectors + PAGE_SIZE);
713 modify_domain(DOMAIN_USER, DOMAIN_CLIENT); 714 modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
714} 715}