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lib: sbi: Add variable-length unprivilege access functions

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sbi_load/store_loop read/write variable-length buffer unprivileged.
Both function use the widest aligned 8/4/2/1 byte load/stores in each
loop to reduce the total number of iterations.

Also switch the scalar/vector misaligned handlers to make use of such
functions to simplify code.

Miscellaneous: remove the unnecessary [taddr] in inline assembly

Signed-off-by: Bo Gan <ganboing@gmail.com>
Tested-by: Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260609060024.706-4-ganboing@gmail.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Bo Gan
2026-06-08 23:00:23 -07:00
committed by Anup Patel
parent 1475f147f6
commit 914aeddaf1
4 changed files with 122 additions and 42 deletions
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include/sbi/sbi_unpriv.h
+6
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@@ -36,6 +36,12 @@ DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u64)
DECLARE_UNPRIVILEGED_STORE_FUNCTION(u64)
DECLARE_UNPRIVILEGED_LOAD_FUNCTION(ulong)
void sbi_load_loop(u8 *buffer, ulong addr, ulong len,
struct sbi_trap_info *trap);
void sbi_store_loop(u8 *buffer, ulong addr, ulong len,
struct sbi_trap_info *trap);
ulong sbi_get_insn(ulong mepc, struct sbi_trap_info *trap);
#endif