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ARM: update FIQ support for relocation of vectors

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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>
This commit is contained in:
Russell King 2013-07-09 01:03:17 +01:00
parent b9b32bf70f
commit e39e3f3ebf
2 changed files with 17 additions and 5 deletions
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3
arch/arm/kernel/entry-armv.S
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@ -1120,6 +1120,9 @@ vector_addrexcptn:
vector_fiq:
subs pc, lr, #4
.globl vector_fiq_offset
.equ vector_fiq_offset, vector_fiq
.section .vectors, "ax", %progbits
__vectors_start:
W(b) vector_rst

19
arch/arm/kernel/fiq.c
View file

@ -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;
}