From: dave.patel@riscstar.com
To: opensbi@lists.infradead.org
Cc: Scott Bambrough <scott@riscstar.com>,
Robin Randhawa <robin.randhawa@sifive.com>,
Anup Patel <anup.patel@qti.qualcomm.com>,
Samuel Holland <samuel.holland@sifive.com>,
Dave Patel <dave.patel@riscstar.com>,
Ray Mao <raymond.mao@riscstar.com>,
Anup Patel <anuppate@qti.qualcomm.com>,
Dhaval <dhaval@rivosinc.com>, Peter Lin <peter.lin@sifive.com>
Subject: [PATCH 3/4] include: sbi: scratch: Add per-hart FP and vector context pointers in scratch
Date: Fri, 20 Mar 2026 14:30:17 +0000 [thread overview]
Message-ID: <20260320143018.74191-4-dave.patel@riscstar.com> (raw)
In-Reply-To: <20260320143018.74191-1-dave.patel@riscstar.com>
From: Dave Patel <dave.patel@riscstar.com>
Extend the per-hart sbi_scratch structure to include pointers to floating-point
and vector context storage.
This enables tracking of the currently active FP and vector context on a per-hart
basis, which is required for eager context switching during trap handling.
The scratch structure serves as the central per-hart storage area, making these
pointers readily accessible in low-level trap and context switch paths.
The FP and vector context pointers are used by the corresponding save/restore
routines to preserve architectural state across traps, ensuring correct isolation
between privilege levels.
This change lays the foundation for eager FP and vector context management in OpenSBI.
Signed-off-by: Dave Patel <dave.patel@riscstar.com>
---
include/sbi/sbi_scratch.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/sbi/sbi_scratch.h b/include/sbi/sbi_scratch.h
index 58d54628..13e4a294 100644
--- a/include/sbi/sbi_scratch.h
+++ b/include/sbi/sbi_scratch.h
@@ -54,6 +54,8 @@
#ifndef __ASSEMBLER__
#include <sbi/sbi_types.h>
+#include <sbi/sbi_fp.h>
+#include <sbi/sbi_vector.h>
/** Representation of per-HART scratch space */
struct sbi_scratch {
@@ -87,6 +89,9 @@ struct sbi_scratch {
unsigned long options;
/** Index of the hart */
unsigned long hartindex;
+ /* Current FP/Vector context owner per hart */
+ struct sbi_fp_context *fp_ctx;
+ struct sbi_vector_context *vec_ctx;
};
/**
--
2.43.0
--
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next prev parent reply other threads:[~2026-03-20 14:30 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-20 14:30 [PATCH v1 0/4] Add eager FP and RISC-V vector context switching support dave.patel
2026-03-20 14:30 ` [PATCH 1/4] lib: sbi: Add RISC-V vector context save/restore support (eager switching) dave.patel
2026-03-23 4:37 ` Samuel Holland
2026-03-23 10:05 ` Dave Patel
2026-03-20 14:30 ` [PATCH 2/4] lib: sbi: Add floating-point context save/restore support dave.patel
2026-03-20 14:30 ` dave.patel [this message]
2026-03-20 14:30 ` [PATCH 4/4] lib: sbi: trap: Save/restore FP and vector state on trap entry/exit dave.patel
2026-03-23 4:42 ` Samuel Holland
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