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authorRussell King <rmk+kernel@arm.linux.org.uk>2013-07-09 01:03:17 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-07-31 21:34:56 +0100
commite39e3f3ebfef03450cf7bfa7a974a8c61f7980c8 (patch)
treef54303b9ba055b020579a3231ff36ea30b2f9044 /arch/arm/kernel/fiq.c
parentb9b32bf70f2fb710b07c94e13afbc729afe221da (diff)
downloadlinux-e39e3f3ebfef03450cf7bfa7a974a8c61f7980c8.tar.bz2
ARM: update FIQ support for relocation of vectors
FIQ should no longer copy the FIQ code into the user visible vector page. Instead, it should use the hidden page. This change makes that happen. Cc: <stable@vger.kernel.org> Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/fiq.c')
-rw-r--r--arch/arm/kernel/fiq.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/arch/arm/kernel/fiq.c b/arch/arm/kernel/fiq.c
index 2adda11f712f..25442f451148 100644
--- a/arch/arm/kernel/fiq.c
+++ b/arch/arm/kernel/fiq.c
@@ -47,6 +47,11 @@
#include <asm/irq.h>
#include <asm/traps.h>
+#define FIQ_OFFSET ({ \
+ extern void *vector_fiq_offset; \
+ (unsigned)&vector_fiq_offset; \
+ })
+
static unsigned long no_fiq_insn;
/* Default reacquire function
@@ -80,13 +85,16 @@ int show_fiq_list(struct seq_file *p, int prec)
void set_fiq_handler(void *start, unsigned int length)
{
#if defined(CONFIG_CPU_USE_DOMAINS)
- memcpy((void *)0xffff001c, start, length);
+ void *base = (void *)0xffff0000;
#else
- memcpy(vectors_page + 0x1c, start, length);
+ void *base = vectors_page;
#endif
- flush_icache_range(0xffff001c, 0xffff001c + length);
+ unsigned offset = FIQ_OFFSET;
+
+ memcpy(base + offset, start, length);
+ flush_icache_range(0xffff0000 + offset, 0xffff0000 + offset + length);
if (!vectors_high())
- flush_icache_range(0x1c, 0x1c + length);
+ flush_icache_range(offset, offset + length);
}
int claim_fiq(struct fiq_handler *f)
@@ -144,6 +152,7 @@ EXPORT_SYMBOL(disable_fiq);
void __init init_FIQ(int start)
{
- no_fiq_insn = *(unsigned long *)0xffff001c;
+ unsigned offset = FIQ_OFFSET;
+ no_fiq_insn = *(unsigned long *)(0xffff0000 + offset);
fiq_start = start;
}