[PATCH 1/7] include: sbi_scratch: Add tmp1 scratch space for RNMI context saving

[Evgeny Voevodin]

From: Evgeny Voevodin <evvoevod at tenstorrent.com>

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 at tenstorrent.com>
---
 firmware/fw_base.S        |  3 ++-
 include/sbi/sbi_scratch.h | 11 ++++++++---
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/firmware/fw_base.S b/firmware/fw_base.S
index 63bb4473..cdb15429 100644
--- a/firmware/fw_base.S
+++ b/firmware/fw_base.S
@@ -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
diff --git a/include/sbi/sbi_scratch.h b/include/sbi/sbi_scratch.h
index 58d54628..a6edeb2d 100644
--- a/include/sbi/sbi_scratch.h
+++ b/include/sbi/sbi_scratch.h
@@ -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);
 
-- 
2.43.0