lib: sbi: Make per-HART stack size configurable via Kconfig

[Oriol Catalan | OPENCHIP]

lib: sbi: Make per-HART stack size configurable via Kconfig

The per-HART stack size for exception/interrupt handling is currently
hardcoded to 8192 bytes in SBI_PLATFORM_DEFAULT_HART_STACK_SIZE. This
may not be sufficient for platforms with deeper call stacks (e.g., those
enabling additional SBI extensions) or may be wasteful for minimal
platforms.

Introduce a HART_STACK_SIZE Kconfig option in lib/sbi/Kconfig with a
valid range of 8192 to 1048576 bytes and a default of 8192 bytes to
preserve existing behavior. The SBI_PLATFORM_DEFAULT_HART_STACK_SIZE
macro now resolves to CONFIG_HART_STACK_SIZE, allowing all platforms
to benefit from a single configuration knob without any source changes.

Signed-off-by: Oriol Catalan <oriol.catalan at openchip.com>

diff --git a/include/sbi/sbi_platform.h b/include/sbi/sbi_platform.h
index fe382b56..7ea9b961 100644
--- a/include/sbi/sbi_platform.h
+++ b/include/sbi/sbi_platform.h
@@ -160,7 +160,7 @@ struct sbi_platform_operations {
 };

 /** Platform default per-HART stack size for exception/interrupt handling */
-#define SBI_PLATFORM_DEFAULT_HART_STACK_SIZE   8192
+#define SBI_PLATFORM_DEFAULT_HART_STACK_SIZE   CONFIG_HART_STACK_SIZE

 /** Platform default heap size */
 #define SBI_PLATFORM_DEFAULT_HEAP_SIZE(__num_hart)     \
diff --git a/lib/sbi/Kconfig b/lib/sbi/Kconfig
index c6cc04bc..2f6fa3a4 100644
--- a/lib/sbi/Kconfig
+++ b/lib/sbi/Kconfig
@@ -2,6 +2,11 @@

 menu "Generic SBI Support"

+config HART_STACK_SIZE
+       int "Per-HART stack size (bytes)"
+       range 8192 1048576
+       default 8192
+
 config CONSOLE_EARLY_BUFFER_SIZE
        int "Early console buffer size (bytes)"
        default 256


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