opensbi.git/lib/sbi/sbi_trap.c, branch master

lib: sbi: Move trap delegation setup to sbi_trap.c

2026-07-21T06:20:46Z

Currently, the trap delegation setup is part of sbi_hart.c and called via sbi_hart_init() whereas the per-hart trap (aka exception and interrupt) handling is part of sbi_trap.c. Move trap delegation init to sbi_trap.c and call it via new sbi_trap_init() from both cold boot and warm boot path. This way trap delegation setup is in same place as trap handling. Signed-off-by: Anup Patel Link: https://lore.kernel.org/r/20260613132129.2135128-2-anup.patel@oss.qualcomm.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

lib: sbi_trap: Add support for vectored interrupts

2025-04-13T00:21:17Z

When redirecting an exception to S-mode, transform the (v)stvec CSR value as described in the privileged spec to derive the S-mode PC. Since OpenSBI never redirects interrupts, only synchronous exceptions, the only action needed is to mask out the (v)stvec.MODE field. Reported-by: Jan Reinhard Closes: https://github.com/riscv-software-src/opensbi/issues/391 Signed-off-by: Samuel Holland Reviwed-by: Anup Patel Link: https://lore.kernel.org/r/20250305014729.3143535-1-samuel.holland@sifive.com Signed-off-by: Anup Patel

lib: sbi: move sbi_double_trap_handler() to a dedicated header

2025-01-30T05:02:18Z

We will add new functions to sbi_double_trap.c in order to register an SSE event, split this to a header as part of preparation work. Signed-off-by: Clément Léger Reviewed-by: Anup Patel

lib: sbi: pmu: fix usage of sbi_pmu_irq_bit()

2025-01-30T05:00:45Z

While sbi_pmu_irq_bit() was used to delegate irq to S-mode, LCOFIP usage was still hardcoded in various places. This led to change the returned value of sbi_pmu_irq_bit() to be a bit number rather than a bit mask since it returns an 'int' and we need to obtain the bit number itself to handle it in the IRQs handlers. Add a similar function to return the irq mask which can also be used where the mask is required rather than the bit itself. Signed-off-by: Clément Léger Reviewed-by: Samuel Holland Reviewed-by: Atish Patra

lib: sbi: add Ssdbltrp ISA extension support

2024-10-25T18:28:00Z

Add Ssdbltrp trap handler support for S-mode double trap handling. If the trap is received while in VS-mode, then the trap is redirected to S-mode. If caught while in HS-mode, then an error is returned to the top trap handler which will panic. Signed-off-by: Clément Léger Reviewed-by: Samuel Holland

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: add zicfilp/zicfiss and elp cfi state reflect back in status

2024-09-23T13:28:04Z

This patch adds support to check for zicfilp / zicfiss extension. zicfilp record status of hart's ELP state in *status csr. Missing landing pad sets MPELP in mstatus. When SBI is redirecting back to S/VS/HS, SPELP is set in sstatus/vsstatus. Signed-off-by: Deepak Gupta Reviewed-by: Atish Patra Reviewed-by: Samuel Holland

lib: sbi: Add SSE support for PMU events

2024-04-05T11:39:39Z

Add SSE callbacks registration to PMU driver in order to disable interrupt delegation for PMU interrupts. When interrupts are undelegated send the PMU SSE event upon LCOFIP IRQ. Signed-off-by: Clément Léger Reviewed-by: Anup Patel