mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-29 01:59:02 +00:00
51 lines
1.8 KiB
Diff
51 lines
1.8 KiB
Diff
From 2ba85e7af4c639d933c9a87a6d7363f2983d5ada Mon Sep 17 00:00:00 2001
|
|
From: Russell King <rmk+kernel@arm.linux.org.uk>
|
|
Date: Thu, 08 Aug 2013 10:51:21 +0000
|
|
Subject: ARM: Fix FIQ code on VIVT CPUs
|
|
|
|
Aaro Koskinen reports the following oops:
|
|
Installing fiq handler from c001b110, length 0x164
|
|
Unable to handle kernel paging request at virtual address ffff1224
|
|
pgd = c0004000
|
|
[ffff1224] *pgd=00000000, *pte=11fff0cb, *ppte=11fff00a
|
|
...
|
|
[<c0013154>] (set_fiq_handler+0x0/0x6c) from [<c0365d38>] (ams_delta_init_fiq+0xa8/0x160)
|
|
r6:00000164 r5:c001b110 r4:00000000 r3:fefecb4c
|
|
[<c0365c90>] (ams_delta_init_fiq+0x0/0x160) from [<c0365b14>] (ams_delta_init+0xd4/0x114)
|
|
r6:00000000 r5:fffece10 r4:c037a9e0
|
|
[<c0365a40>] (ams_delta_init+0x0/0x114) from [<c03613b4>] (customize_machine+0x24/0x30)
|
|
|
|
This is because the vectors page is now write-protected, and to change
|
|
code in there we must write to its original alias. Make that change,
|
|
and adjust the cache flushing such that the code will become visible
|
|
to the instruction stream on VIVT CPUs.
|
|
|
|
Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi>
|
|
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
|
|
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
|
|
---
|
|
(limited to 'arch/arm/kernel/fiq.c')
|
|
|
|
--- a/arch/arm/kernel/fiq.c
|
|
+++ b/arch/arm/kernel/fiq.c
|
|
@@ -84,17 +84,13 @@ int show_fiq_list(struct seq_file *p, in
|
|
|
|
void set_fiq_handler(void *start, unsigned int length)
|
|
{
|
|
-#if defined(CONFIG_CPU_USE_DOMAINS)
|
|
- void *base = (void *)0xffff0000;
|
|
-#else
|
|
void *base = vectors_page;
|
|
-#endif
|
|
unsigned offset = FIQ_OFFSET;
|
|
|
|
memcpy(base + offset, start, length);
|
|
+ if (!cache_is_vipt_nonaliasing())
|
|
+ flush_icache_range(base + offset, offset + length);
|
|
flush_icache_range(0xffff0000 + offset, 0xffff0000 + offset + length);
|
|
- if (!vectors_high())
|
|
- flush_icache_range(offset, offset + length);
|
|
}
|
|
|
|
int claim_fiq(struct fiq_handler *f)
|