Re: [PATCH 02/14] ARM: ARMv7M: Enlarge vector table to 256 entries
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: 2015-02-12 20:34:54
Also in:
linux-arch, linux-arm-kernel, linux-devicetree, linux-gpio, linux-serial, lkml
On Thu, Feb 12, 2015 at 6:45 PM, Maxime Coquelin [off-list ref] wrote:
From Cortex-M4 and M7 reference manuals, the nvic supports up to 240 interrupts. So the number of entries in vectors table is 256. This patch adds the missing entries, and change the alignement, so that vector_table remains naturally aligned.
Shouldn't this depend on ARCH_STM32, or some other M4 or M7 specific Kconfig option, to avoid wasting the space on other CPUs?
quoted hunk
Signed-off-by: Maxime Coquelin <mcoquelin.stm32@gmail.com> --- arch/arm/kernel/entry-v7m.S | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)diff --git a/arch/arm/kernel/entry-v7m.S b/arch/arm/kernel/entry-v7m.S index 8944f49..29a461b 100644 --- a/arch/arm/kernel/entry-v7m.S +++ b/arch/arm/kernel/entry-v7m.S@@ -117,9 +117,9 @@ ENTRY(__switch_to) ENDPROC(__switch_to) .data - .align 8 + .align 10 /* - * Vector table (64 words => 256 bytes natural alignment) + * Vector table (256 words => 1024 bytes alignment) */ ENTRY(vector_table) .long 0 @ 0 - Reset stack pointer@@ -138,6 +138,6 @@ ENTRY(vector_table) .long __invalid_entry @ 13 - Reserved .long __pendsv_entry @ 14 - PendSV .long __invalid_entry @ 15 - SysTick - .rept 64 - 16 - .long __irq_entry @ 16..64 - External Interrupts + .rept 256 - 16 + .long __irq_entry @ 16..256 - External Interrupts .endr --1.9.1
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds