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| author | Yuriy Kolerov <yuriy.kolerov@synopsys.com> | 2017-01-31 12:45:22 +0100 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2017-02-06 18:37:57 +0100 |
| commit | f33b8cddc8ad8ce83cd3214406bcf68ec6c4d8ec (patch) | |
| tree | bd751f96e7cf6b583a27edcb8f687d875a4c8c04 /arch/arc/kernel | |
| parent | ARC: [intc-*]: confine NR_CPU_IRQS to intc code (diff) | |
| download | linux-f33b8cddc8ad8ce83cd3214406bcf68ec6c4d8ec.tar.xz linux-f33b8cddc8ad8ce83cd3214406bcf68ec6c4d8ec.zip | |
ARCv2: intc: Rework the build time irq count information
Currently Kconfig knob ARC_NUMBER_OF_INTERRUPTS is used as indicator of
hard irq count. But it is flawed that it doesn't affect
- NR_IRQS : for number of virtual interrupts
- NR_CPU_IRQS : for number of hardware interrupts
Moreover the actual hardware irq count might still not be same as
ARC_NUMBER_OF_INTERRUPTS. So use the information availble in the
Build Configuration Registers and get rid of the Kconfig option.
We still need "some" build time info about irq count to set up
sufficient number of vector table entries. This is done with a
sufficiently large NR_CPU_IRQS which will eventually be used soley for
that purpose (subsequent patches will remove its usage elsewhere)
So to summarize what this patch does:
* NR_CPU_IRQS defines a maximum number of hardware interrupts.
* Remove ARC_NUMBER_OF_INTERRUPTS option and create interrupts
table for all possible hardware interrupts.
* Increase a maximum number of virtual IRQs to 512. ARCv2 can
support 240 interrupts in the core interrupts controllers
and 128 interrupts in IDU. Thus 512 virtual IRQs must be
enough for most configurations of boards.
This patch leads to NR_CPU_IRQS in 2 places, to reduce the overall
churn. The next patch will remove the 2nd definition anyways.
Signed-off-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: reworked the changelog a bit]
Diffstat (limited to 'arch/arc/kernel')
| -rw-r--r-- | arch/arc/kernel/entry-arcv2.S | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arc/kernel/entry-arcv2.S b/arch/arc/kernel/entry-arcv2.S index 0b6388a5f0b8..2585632eaa68 100644 --- a/arch/arc/kernel/entry-arcv2.S +++ b/arch/arc/kernel/entry-arcv2.S @@ -14,6 +14,11 @@ #include <asm/arcregs.h> #include <asm/irqflags.h> +; A maximum number of supported interrupts in the core interrupt controller. +; This number is not equal to the maximum interrupt number (256) because +; first 16 lines are reserved for exceptions and are not configurable. +#define NR_CPU_IRQS 240 + .cpu HS #define VECTOR .word @@ -52,7 +57,7 @@ VECTOR handle_interrupt ; unused VECTOR handle_interrupt ; (23) unused # End of fixed IRQs -.rept CONFIG_ARC_NUMBER_OF_INTERRUPTS - 8 +.rept NR_CPU_IRQS - 8 VECTOR handle_interrupt .endr |