diff options
| author | Evgeny Voevodin <[email protected]> | 2026-05-07 18:08:04 +0000 |
|---|---|---|
| committer | Anup Patel <[email protected]> | 2026-05-09 12:59:43 +0530 |
| commit | 00fec20b4976c756ddacedef23a6bf510fa00dad (patch) | |
| tree | 5fbd16c626e7755dc06e5f66ac5e4ad91ed7e8da /include | |
| parent | b63606f98180cb92cc7c47c42b63bf92a21dfdee (diff) | |
firmware: Add RNMI handler infrastructure
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 <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Link: https://lore.kernel.org/r/050ae6d2762ba8d5b9dfb3cc1960a23aa3d6c549.1778176768.git.evvoevod@tenstorrent.com
Signed-off-by: Anup Patel <[email protected]>
Diffstat (limited to 'include')
| -rw-r--r-- | include/sbi/sbi_platform.h | 4 | ||||
| -rw-r--r-- | include/sbi/sbi_trap.h | 2 |
2 files changed, 6 insertions, 0 deletions
diff --git a/include/sbi/sbi_platform.h b/include/sbi/sbi_platform.h index e65d9877..715df499 100644 --- a/include/sbi/sbi_platform.h +++ b/include/sbi/sbi_platform.h @@ -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 */ diff --git a/include/sbi/sbi_trap.h b/include/sbi/sbi_trap.h index 731a0c98..091a2446 100644 --- a/include/sbi/sbi_trap.h +++ b/include/sbi/sbi_trap.h @@ -289,6 +289,8 @@ static inline void sbi_trap_set_context(struct sbi_scratch *scratch, struct sbi_trap_context *sbi_trap_handler(struct sbi_trap_context *tcntx); +struct sbi_trap_context *sbi_trap_rnmi_handler(struct sbi_trap_context *tcntx); + #endif #endif |