>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@xxxxxxxxx> --- 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 # -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
