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.st...@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 <ste...@agner.ch> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
