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Evgeny VoevodinandAnup Patel 00fec20b49 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 <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>
 2026-05-09 12:59:43 +05:30
Evgeny VoevodinandAnup Patel b63606f981 lib: sbi: Add Smrnmi extension macros for registers and bits 
Add CSR definitions (MNSCRATCH, MNSTATUS, MNEPC, MNCAUSE) and bit definitions
(MNSTATUS_NMIE, MNSTATUS_MNPV, MNSTATUS_MNPP). Also add SBI_HART_EXT_SMRNMI to
the hart extension enumeration.

Signed-off-by: Evgeny Voevodin <evvoevod@tenstorrent.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/1c6feb6d359b9827b3c2ad8f4f0e0a4dfd1de911.1778176768.git.evvoevod@tenstorrent.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2026-05-09 12:59:43 +05:30
Evgeny VoevodinandAnup Patel 5d248a0132 include: sbi_scratch: Add tmp1 scratch space for RNMI context saving 
RNMI handlers use MNSCRATCH instead of MSCRATCH and need separate scratch
space from regular trap handling. Add tmp1 for RNMI context while tmp0
remains for regular traps.

Signed-off-by: Evgeny Voevodin <evvoevod@tenstorrent.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/0a5d241fa1db03e71a3f56be24708cbbc8037e28.1778176768.git.evvoevod@tenstorrent.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2026-05-09 12:59:43 +05:30