From: stefan@agner.ch (Stefan Agner)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 02/18] ARM: ARMv7M: Enlarge vector table to 256 entries
Date: Mon, 09 Mar 2015 01:29:28 +0100 [thread overview]
Message-ID: <1364122b3b72c50138d81ee4eec2a4c7@agner.ch> (raw)
In-Reply-To: <1424455277-29983-3-git-send-email-mcoquelin.stm32@gmail.com>
On 2015-02-20 19:01, Maxime Coquelin wrote:
> From Cortex-M reference manuals, the nvic supports up to 240 interrupts.
> So the number of entries in vectors table is up to 256.
>
> This patch adds a new config flag to specify the number of external interrupts.
> Some ifdeferies are added in order to respect the natural alignment without
> wasting too much space on smaller systems.
>
> Signed-off-by: Maxime Coquelin <mcoquelin.stm32@gmail.com>
> ---
> arch/arm/kernel/entry-v7m.S | 13 +++++++++----
> arch/arm/mm/Kconfig | 15 +++++++++++++++
> 2 files changed, 24 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm/kernel/entry-v7m.S b/arch/arm/kernel/entry-v7m.S
> index 8944f49..68cde36 100644
> --- a/arch/arm/kernel/entry-v7m.S
> +++ b/arch/arm/kernel/entry-v7m.S
> @@ -117,9 +117,14 @@ ENTRY(__switch_to)
> ENDPROC(__switch_to)
>
> .data
> - .align 8
> +#if CONFIG_CPUV7M_NUM_IRQ <= 112
> + .align 9
> +#else
> + .align 10
> +#endif
> +
> /*
> - * Vector table (64 words => 256 bytes natural alignment)
> + * Vector table (Natural alignment need to be ensured)
> */
> ENTRY(vector_table)
> .long 0 @ 0 - Reset stack pointer
> @@ -138,6 +143,6 @@ 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 CONFIG_CPUV7M_NUM_IRQ
> + .long __irq_entry @ External Interrupts
> .endr
> diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
> index c43c714..27eb835 100644
> --- a/arch/arm/mm/Kconfig
> +++ b/arch/arm/mm/Kconfig
> @@ -604,6 +604,21 @@ config CPU_USE_DOMAINS
> This option enables or disables the use of domain switching
> via the set_fs() function.
>
> +config CPUV7M_NUM_IRQ
> + int "Number of external interrupts connected to the NVIC"
> + depends on CPU_V7M
> + default 90 if ARCH_STM32
> + default 38 if ARCH_EFM32
> + default 240
> + help
> + This option indicates the number of interrupts connected to the NVIC.
> + The value can be larger than the real number of interrupts supported
> + by the system, but must not be lower.
> + The default value is 240, corresponding to the maximum number of
> + interrupts supported by the NVIC on Cortex-M family.
> +
> + If unsure, keep default value.
> +
> #
> # CPU supports 36-bit I/O
> #
I sent a patch which extended that vector table some weeks ago:
https://lkml.org/lkml/2014/12/29/296
But your solution is definitely more flexible, and given that we deal
with small devices here, it's worth saving memory.
Acked-by: Stefan Agner <stefan@agner.ch>
next prev parent reply other threads:[~2015-03-09 0:29 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-20 18:00 [PATCH v2 00/18] Add support to STMicroelectronics STM32 family Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 01/18] scripts: link-vmlinux: Don't pass page offset to kallsyms if XIP Kernel Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 02/18] ARM: ARMv7M: Enlarge vector table to 256 entries Maxime Coquelin
2015-02-20 19:47 ` Uwe Kleine-König
2015-02-23 10:33 ` Maxime Coquelin
2015-02-26 10:29 ` Maxime Coquelin
2015-02-26 10:43 ` Uwe Kleine-König
2015-03-09 0:29 ` Stefan Agner [this message]
2015-03-09 17:12 ` Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 03/18] dt-bindings: Document the ARM System timer bindings Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 04/18] clocksource: Add ARM System timer driver Maxime Coquelin
2015-02-20 19:54 ` Uwe Kleine-König
2015-02-20 21:48 ` Paul Bolle
2015-03-02 16:53 ` Maxime Coquelin
2015-03-03 19:43 ` Paul Bolle
2015-03-04 12:08 ` Maxime Coquelin
2015-03-09 21:12 ` Paul Bolle
2015-03-09 22:17 ` Uwe Kleine-König
2015-03-09 15:50 ` Linus Walleij
2015-03-09 17:00 ` Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 05/18] reset: Add reset_controller_of_init() function Maxime Coquelin
2015-03-10 15:00 ` Arnd Bergmann
2015-03-10 15:28 ` Maxime Coquelin
2015-03-10 20:19 ` Arnd Bergmann
2015-03-10 21:30 ` Rob Herring
2015-03-12 21:08 ` Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 06/18] dt-bindings: Document the STM32 reset bindings Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 07/18] drivers: reset: Add STM32 reset driver Maxime Coquelin
2015-03-10 15:02 ` Arnd Bergmann
2015-03-10 15:41 ` Maxime Coquelin
2015-03-10 15:44 ` Maxime Coquelin
2015-03-10 20:21 ` Arnd Bergmann
2015-03-10 21:20 ` Maxime Coquelin
2015-03-11 13:08 ` Philipp Zabel
2015-03-12 21:05 ` Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 08/18] dt-bindings: Document the STM32 timer bindings Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 09/18] clockevent: Add STM32 Timer driver Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 10/18] dt-bindings: Document the STM32 pin controller Maxime Coquelin
2015-03-06 9:12 ` Linus Walleij
2015-03-06 9:35 ` Linus Walleij
2015-02-20 18:01 ` [PATCH v2 11/18] pinctrl: Add pinctrl driver for STM32 MCUs Maxime Coquelin
2015-03-06 9:24 ` Linus Walleij
2015-03-06 9:57 ` Maxime Coquelin
2015-03-10 15:08 ` Arnd Bergmann
2015-03-18 1:08 ` Linus Walleij
2015-02-20 18:01 ` [PATCH v2 12/18] dt-bindings: Document the STM32 USART bindings Maxime Coquelin
2015-03-10 15:08 ` Arnd Bergmann
2015-03-10 15:45 ` Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 13/18] serial: stm32-usart: Add STM32 USART Driver Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 14/18] ARM: Add STM32 family machine Maxime Coquelin
2015-02-20 18:33 ` Peter Meerwald
2015-02-25 11:52 ` Maxime Coquelin
2015-02-20 20:00 ` Uwe Kleine-König
2015-02-20 21:37 ` Paul Bolle
2015-02-25 12:04 ` Maxime Coquelin
2015-02-25 12:03 ` Maxime Coquelin
2015-03-10 15:10 ` Arnd Bergmann
2015-02-20 18:01 ` [PATCH v2 15/18] ARM: dts: Add ARM System timer as clockevent in armv7m Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 16/18] ARM: dts: Introduce STM32F429 MCU Maxime Coquelin
2015-03-02 17:42 ` Andreas Färber
2015-03-03 17:59 ` Maxime Coquelin
2015-03-09 14:39 ` Linus Walleij
2015-03-09 16:51 ` Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 17/18] ARM: configs: Add STM32 defconfig Maxime Coquelin
2015-02-20 18:01 ` [PATCH v2 18/18] MAINTAINERS: Add entry for STM32 MCUs Maxime Coquelin
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