diff mbox series

[02/12] include: sbi: Store the hart index in struct sbi_scratch

Message ID 20240830154929.3971790-3-samuel.holland@sifive.com
State New
Headers show
Series OpenSBI Hart Index Optimizations | expand

Commit Message

Samuel Holland Aug. 30, 2024, 3:49 p.m. UTC 
This is a more efficient way to get the index of the current hart than
calling a function to loop through the hartindex -> hartid lookup table.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
---

 firmware/fw_base.S        |  2 ++
 include/sbi/sbi_scratch.h | 10 +++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/firmware/fw_base.S b/firmware/fw_base.S
index b950c0b8..30dc28f0 100644
--- a/firmware/fw_base.S
+++ b/firmware/fw_base.S
@@ -218,6 +218,8 @@  _scratch_init:
 #endif
 	REG_S	a0, SBI_SCRATCH_OPTIONS_OFFSET(tp)
 	MOV_3R	a0, s0, a1, s1, a2, s2
+	/* Store hart index in scratch space */
+	REG_S	t1, SBI_SCRATCH_HARTINDEX_OFFSET(tp)
 	/* Move to next scratch space */
 	add	t1, t1, t2
 	blt	t1, s7, _scratch_init
diff --git a/include/sbi/sbi_scratch.h b/include/sbi/sbi_scratch.h
index 12e6a983..9ae4f891 100644
--- a/include/sbi/sbi_scratch.h
+++ b/include/sbi/sbi_scratch.h
@@ -42,8 +42,10 @@ 
 #define SBI_SCRATCH_TMP0_OFFSET			(12 * __SIZEOF_POINTER__)
 /** Offset of options member in sbi_scratch */
 #define SBI_SCRATCH_OPTIONS_OFFSET		(13 * __SIZEOF_POINTER__)
+/** Offset of hartindex member in sbi_scratch */
+#define SBI_SCRATCH_HARTINDEX_OFFSET		(14 * __SIZEOF_POINTER__)
 /** Offset of extra space in sbi_scratch */
-#define SBI_SCRATCH_EXTRA_SPACE_OFFSET		(14 * __SIZEOF_POINTER__)
+#define SBI_SCRATCH_EXTRA_SPACE_OFFSET		(15 * __SIZEOF_POINTER__)
 /** Maximum size of sbi_scratch (4KB) */
 #define SBI_SCRATCH_SIZE			(0x1000)
 
@@ -83,6 +85,8 @@  struct sbi_scratch {
 	unsigned long tmp0;
 	/** Options for OpenSBI library */
 	unsigned long options;
+	/** Index of the hart */
+	unsigned long hartindex;
 };
 
 /**
@@ -202,6 +206,10 @@  do {									\
 					= (__type)(__ptr);		\
 } while (0)
 
+/** Get the hart index of the current hart */
+#define current_hartindex() \
+	(sbi_scratch_thishart_ptr()->hartindex)
+
 /** Last HART index having a sbi_scratch pointer */
 extern u32 last_hartindex_having_scratch;