linux-kernel - [PATCH v4 02/15] ARM: ARMv7-M: Enlarge vector table up to 256 entries

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Date:	Tue, 31 Mar 2015 18:24:43 +0200
From:	Maxime Coquelin <mcoquelin.stm32@...il.com>
To:	u.kleine-koenig@...gutronix.de, afaerber@...e.de,
	geert@...ux-m68k.org, Rob Herring <robh+dt@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, stefan@...er.ch,
	pmeerw@...erw.net, pebolle@...cali.nl, peter@...leysoftware.com,
	andy.shevchenko@...il.com, cw00.choi@...sung.com,
	Russell King <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	Jonathan Corbet <corbet@....net>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Joe Perches <joe@...ches.com>, Antti Palosaari <crope@....fi>,
	Tejun Heo <tj@...nel.org>, Will Deacon <will.deacon@....com>,
	Nikolay Borisov <Nikolay.Borisov@....com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Kees Cook <keescook@...omium.org>,
	Michal Marek <mmarek@...e.cz>, linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-serial@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-api@...r.kernel.org, mcoquelin.stm32@...il.com
Subject: [PATCH v4 02/15] ARM: ARMv7-M: Enlarge vector table up to 256 entries

>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.

Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Acked-by: Stefan Agner <stefan@...er.ch>
Tested-by: Chanwoo Choi <cw00.choi@...sung.com>
Signed-off-by: Maxime Coquelin <mcoquelin.stm32@...il.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..b6c8bb9 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_CPU_V7M_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_CPU_V7M_NUM_IRQ
+	.long	__irq_entry		@ External Interrupts
 	.endr
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 9b4f29e..aec53b4 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 CPU_V7M_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
 #
-- 
1.9.1

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