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include: sbi_scratch: Add tmp1 scratch space for RNMI context saving

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RNMI handlers use MNSCRATCH instead of MSCRATCH and need separate scratch
space from regular trap handling. Add tmp1 for RNMI context while tmp0
remains for regular traps.

Signed-off-by: Evgeny Voevodin <evvoevod@tenstorrent.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/0a5d241fa1db03e71a3f56be24708cbbc8037e28.1778176768.git.evvoevod@tenstorrent.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Evgeny Voevodin
2026-05-07 18:08:02 +00:00
committed by Anup Patel
parent 2257e99571
commit 5d248a0132
2 changed files with 10 additions and 4 deletions
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firmware/fw_base.S
+2 -1
View File
@@ -258,9 +258,10 @@ _scratch_init:
/* Store hartid-to-scratch function address in scratch space */
lla a4, _hartid_to_scratch
REG_S a4, SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET(tp)
/* Clear trap_context and tmp0 in scratch space */
/* Clear trap_context, tmp0 and tmp1 in scratch space */
REG_S zero, SBI_SCRATCH_TRAP_CONTEXT_OFFSET(tp)
REG_S zero, SBI_SCRATCH_TMP0_OFFSET(tp)
REG_S zero, SBI_SCRATCH_TMP1_OFFSET(tp)
/* Store firmware options in scratch space */
MOV_3R s0, a0, s1, a1, s2, a2
#ifdef FW_OPTIONS
include/sbi/sbi_scratch.h
+8 -3
View File
@@ -40,12 +40,14 @@
#define SBI_SCRATCH_TRAP_CONTEXT_OFFSET (11 * __SIZEOF_POINTER__)
/** Offset of tmp0 member in sbi_scratch */
#define SBI_SCRATCH_TMP0_OFFSET (12 * __SIZEOF_POINTER__)
/** Offset of tmp1 member in sbi_scratch */
#define SBI_SCRATCH_TMP1_OFFSET (13 * __SIZEOF_POINTER__)
/** Offset of options member in sbi_scratch */
#define SBI_SCRATCH_OPTIONS_OFFSET (13 * __SIZEOF_POINTER__)
#define SBI_SCRATCH_OPTIONS_OFFSET (14 * __SIZEOF_POINTER__)
/** Offset of hartindex member in sbi_scratch */
#define SBI_SCRATCH_HARTINDEX_OFFSET (14 * __SIZEOF_POINTER__)
#define SBI_SCRATCH_HARTINDEX_OFFSET (15 * __SIZEOF_POINTER__)
/** Offset of extra space in sbi_scratch */
#define SBI_SCRATCH_EXTRA_SPACE_OFFSET (15 * __SIZEOF_POINTER__)
#define SBI_SCRATCH_EXTRA_SPACE_OFFSET (16 * __SIZEOF_POINTER__)
/** Maximum size of sbi_scratch (4KB) */
#define SBI_SCRATCH_SIZE (0x1000)
@@ -83,6 +85,8 @@ struct sbi_scratch {
unsigned long trap_context;
/** Temporary storage */
unsigned long tmp0;
/** Temporary storage */
unsigned long tmp1;
/** Options for OpenSBI library */
unsigned long options;
/** Index of the hart */
@@ -106,6 +110,7 @@ assert_member_offset(struct sbi_scratch, platform_addr, SBI_SCRATCH_PLATFORM_ADD
assert_member_offset(struct sbi_scratch, hartid_to_scratch, SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET);
assert_member_offset(struct sbi_scratch, trap_context, SBI_SCRATCH_TRAP_CONTEXT_OFFSET);
assert_member_offset(struct sbi_scratch, tmp0, SBI_SCRATCH_TMP0_OFFSET);
assert_member_offset(struct sbi_scratch, tmp1, SBI_SCRATCH_TMP1_OFFSET);
assert_member_offset(struct sbi_scratch, options, SBI_SCRATCH_OPTIONS_OFFSET);
assert_member_offset(struct sbi_scratch, hartindex, SBI_SCRATCH_HARTINDEX_OFFSET);