opensbi.git/include/sbi/sbi_trap.h, branch v1.9

include: sbi: Add GET_RDS_NUM/SET(_FP32/_FP64)_RDS macros

2026-06-16T07:00:22Z

These macros can be used to decode rd' and set rd' in RVC instructions Signed-off-by: Bo Gan Reviewed-by: Anup Patel Tested-by: Anirudh Srinivasan Link: https://lore.kernel.org/r/20260605113214.242-4-ganboing@gmail.com Signed-off-by: Anup Patel

include: sbi: Add sbi_regs_prev_xlen

2026-06-16T06:59:59Z

sbi_regs_prev_xlen reports the xlen of previous mode by decoding from multiple CSRs including mstatus/hstatus/vsstatus Signed-off-by: Bo Gan Reviewed-by: Anup Patel Tested-by: Anirudh Srinivasan Link: https://lore.kernel.org/r/20260605113214.242-3-ganboing@gmail.com Signed-off-by: Anup Patel

firmware: Add RNMI handler infrastructure

2026-05-09T07:29:43Z

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 Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/050ae6d2762ba8d5b9dfb3cc1960a23aa3d6c549.1778176768.git.evvoevod@tenstorrent.com Signed-off-by: Anup Patel

include: sbi: Use array for struct sbi_trap_regs and GET/SET macros

2025-07-22T10:24:27Z

Rather than hand-rolling scaled pointer arithmetic with casts and shifts, let the compiler do so by indexing an array of GPRs, taking advantage of the language's type system to scale based on whatever type the register happens to be. This makes it easier to support CHERI where the registers are capabilities, not plain integers, and so this pointer arithmetic would need to change (and currently REGBYTES is both the size of a register and the size of an integer word upstream). Signed-off-by: Jessica Clarke Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20250709232932.37622-1-jrtc27@jrtc27.com Signed-off-by: Anup Patel

include: sbi: Align SBI trap registers to a nice boundary

2025-02-12T03:44:43Z

Align SBI_TRAP_CONTEXT_SIZE to a multiple of 16 bytes. If it is not aligned to 16 bytes for RV64, it can create performance problems. Aligning it correctly can fix the performance issues. Signed-off-by: Raj Vishwanathan Reviewed-by: Anup Patel

lib: sbi: factorize previous mode computation

2024-10-25T18:23:18Z

Previous privilege mode retrieval from mstatus is done at different places, factorize it rather than copy/pasting it again. Signed-off-by: Clément Léger Reviewed-by: Samuel Holland

lib: sbi: factorize previous virtualization mode read from regs

2024-10-25T18:22:51Z

The same pattern is used at multiple places to verify in which mode the exception was actually taken. Factorize it. Signed-off-by: Clément Léger Reviewed-by: Samuel Holland

lib: sbi: Introduce trap context

2024-03-19T06:01:22Z

Club the struct sbi_trap_regs and struct sbi_trap_info a new struct sbi_trap_context (aka trap context) which must be saved by low-level trap handler before calling sbi_trap_handler(). To track nested traps, the struct sbi_scratch points to the current trap context and the trap context has pointer to pervious context of previous trap. Signed-off-by: Anup Patel Reviewed-by: Samuel Holland Tested-by: Samuel Holland

lib: sbi: Remove sbi_trap_exit() and related code

2024-03-19T06:01:18Z

Over the years, no uses of sbi_trap_exit() have been found so remove it and also remove related code from fw_base.S and sbi_scratch.h. Signed-off-by: Anup Patel Reviewed-by: Samuel Holland Tested-by: Samuel Holland

lib: sbi: Remove epc from struct sbi_trap_info

2024-03-19T06:01:16Z

In the only places this value is used, it duplicates mepc from struct sbi_trap_regs. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel