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firmware: Add RNMI handler infrastructure

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Implement basic Resumable NMI (RNMI) handler support for the RISC-V
Smrnmi extension.

The new _trap_rnmi_handler assembly entry point saves context using the
Smrnmi MN* CSRs (MNSCRATCH, MNEPC, MNSTATUS, MNCAUSE) and returns via
mnret. It dispatches to sbi_trap_rnmi_handler(), which optionally calls
a platform-specific ops->rnmi_handler callback for actual NMI
processing. If no platform handler is registered or it fails, the
event is reported as an unhandled NMI.

The RNMI handler reuses the generic trap context structure but stores MN*
CSR values (MNEPC, MNSTATUS, MNCAUSE) into the corresponding generic
fields (mepc, mstatus, cause) for compatibility with existing trap
infrastructure.

Signed-off-by: Evgeny Voevodin <evvoevod@tenstorrent.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/050ae6d2762ba8d5b9dfb3cc1960a23aa3d6c549.1778176768.git.evvoevod@tenstorrent.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Evgeny Voevodin
2026-05-07 18:08:04 +00:00
committed by Anup Patel
parent b63606f981
commit 00fec20b49
4 changed files with 166 additions and 0 deletions
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include/sbi/sbi_platform.h
+4
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@@ -149,6 +149,10 @@ struct sbi_platform_operations {
unsigned long log2len);
/** platform specific pmp disable on current HART */
void (*pmp_disable)(unsigned int n);
/** platform specific Smrnmi NMI handler.
* Returns SBI_SUCCESS on success, error code if NMI cannot be handled. */
int (*rnmi_handler)(struct sbi_trap_context *tcntx);
};
/** Platform default per-HART stack size for exception/interrupt handling */