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[v2,01/18] include: sbi_scratch: Add helper macros to access data type

Message ID 20230605113749.230696-2-apatel@ventanamicro.com
State Accepted
Headers show
Series Introduce and use simple heap allocator | expand

Commit Message

Anup Patel June 5, 2023, 11:37 a.m. UTC 
Reading and writing a data type in scratch space is a very common
use-case so let us add related helper macros in sbi_scratch.h.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
 include/sbi/sbi_scratch.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
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Patch

diff --git a/include/sbi/sbi_scratch.h b/include/sbi/sbi_scratch.h
index 2966188..58f2d06 100644
--- a/include/sbi/sbi_scratch.h
+++ b/include/sbi/sbi_scratch.h
@@ -174,6 +174,23 @@  void sbi_scratch_free_offset(unsigned long offset);
 #define sbi_scratch_thishart_offset_ptr(offset)	\
 	(void *)((char *)sbi_scratch_thishart_ptr() + (offset))
 
+/** Allocate offset for a data type in sbi_scratch */
+#define sbi_scratch_alloc_type_offset(__type)				\
+	sbi_scratch_alloc_offset(sizeof(__type))
+
+/** Read a data type from sbi_scratch at given offset */
+#define sbi_scratch_read_type(__scratch, __type, __offset)		\
+({									\
+	*((__type *)sbi_scratch_offset_ptr((__scratch), (__offset)));	\
+})
+
+/** Write a data type to sbi_scratch at given offset */
+#define sbi_scratch_write_type(__scratch, __type, __offset, __ptr)	\
+do {									\
+	*((__type *)sbi_scratch_offset_ptr((__scratch), (__offset)))	\
+					= (__type)(__ptr);		\
+} while (0)
+
 /** HART id to scratch table */
 extern struct sbi_scratch *hartid_to_scratch_table[];