[PATCH 4/4] include: sbi: scratch: Add per-hart FP and vector context pointers in scratch

[dave.patel at riscstar.com]

From: Dave Patel <dave.patel at 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 at 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