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doc: touch-up multi-level interrupt documentation

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Some very minor touch-ups for multi-level interrupt
wordings and documentations to better reflects its current
state.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>
This commit is contained in:
Yong Cong Sin 2024-01-25 23:37:19 +08:00 • committed by Carles Cufí
commit d07d8082c9
1 changed files with 6 additions and 6 deletions
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12
doc/kernel/services/interrupts.rst
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@ -59,7 +59,7 @@ nesting support is enabled.
.. _multi_level_interrupts:
Multi-level Interrupt handling
Multi-level Interrupt Handling
==============================
A hardware platform can support more interrupt lines than natively-provided
@ -68,7 +68,7 @@ hardware interrupts are combined into one line that is then routed to
the parent controller.
If nested interrupt controllers are supported, :kconfig:option:`CONFIG_MULTI_LEVEL_INTERRUPTS`
should be set to 1, and :kconfig:option:`CONFIG_2ND_LEVEL_INTERRUPTS` and
should be enabled, and :kconfig:option:`CONFIG_2ND_LEVEL_INTERRUPTS` and
:kconfig:option:`CONFIG_3RD_LEVEL_INTERRUPTS` configured as well, based on the
hardware architecture.
@ -608,7 +608,7 @@ connected.
Going Beyond the Default Supported Number of Interrupts
-------------------------------------------------------
When generating interrupts in the multilevel configuration, 8-bits per level is the default
When generating interrupts in the multi-level configuration, 8-bits per level is the default
mask used when determining which level a given interrupt code belongs to. This can become
a problem when dealing with CPUs that support more than 255 interrupts per single
aggregator. In this case it may be desirable to override these defaults and use a custom
@ -616,11 +616,11 @@ number of bits per level. Regardless of how many bits used for each level, the s
the total bits used between all levels must sum to be less than or equal to 32-bits,
fitting into a single 32-bit integer. To modify the bit total per level, override the
default 8 in `Kconfig.multilevel` by setting :kconfig:option:`CONFIG_1ST_LEVEL_INTERRUPT_BITS`
for the first level, :kconfig:option:`CONFIG_2ND_LEVEL_INTERRUPT_BITS` for the second tier and
:kconfig:option:`CONFIG_3RD_LEVEL_INTERRUPT_BITS` for the third tier. These masks control the
for the first level, :kconfig:option:`CONFIG_2ND_LEVEL_INTERRUPT_BITS` for the second level and
:kconfig:option:`CONFIG_3RD_LEVEL_INTERRUPT_BITS` for the third level. These masks control the
length of the bit masks and shift to apply when generating interrupt values, when checking the
interrupts level and converting interrupts to a different level. The logic controlling
this can be found in `irq.h`
this can be found in :file:`irq_multilevel.h`
Suggested Uses
**************