opensbi.git/include/sbi/sbi_scratch.h, branch master

include: sbi: Add sbi_scratch_hartindex() macro

2026-05-09T07:41:13Z

Add helper macro to extract hart index from scratch pointer. This can be used to check whether scratch pointer belongs to a particular hart or not. Signed-off-by: Anup Patel Reviewed-by: Nicholas Piggin Link: https://lore.kernel.org/r/20260425104048.2335262-2-anup.patel@oss.qualcomm.com Signed-off-by: Anup Patel

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

2026-05-09T07:29:43Z

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 Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/0a5d241fa1db03e71a3f56be24708cbbc8037e28.1778176768.git.evvoevod@tenstorrent.com Signed-off-by: Anup Patel

include: sbi_scratch: fix typo sbi_scratch -> HART id

2026-01-08T07:10:32Z

Fix "sbi_scratch" to "HART id" to better reflect its purpose. Signed-off-by: Leo Yu-Chi Liang Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20260107032602.1143819-1-ycliang@andestech.com Signed-off-by: Anup Patel

lib: sbi: Simplify structure member offset checking

2025-04-15T05:56:36Z

Add a macro assert_member_offset() to perform structure member offset checking. Signed-off-by: Xiang W Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20250319123919.505443-1-wxjstz@126.com Signed-off-by: Anup Patel

lib: sbi: Use sbi_hart_count() and sbi_for_each_hartindex()

2025-03-24T12:27:20Z

Simplify the code and improve consistency by using the new macros where possible. sbi_hart_count() obsoletes sbi_scratch_last_hartindex(). Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: sbi_scratch: Add sbi_hart_count() and for_each_hartindex()

2025-03-24T12:26:08Z

There is currently no helper for iterating through the harts in a system, and code must choose between sbi_scratch_last_hartindex() and sbi_platform_hart_count() for the loop condition. sbi_scratch_last_hartindex() has unusual semantics, leading to the likelihood of off-by-one errors, and sbi_platform_hart_count() is provided by the platform and so may not be properly bounded. Add a new helper which definitively reports the number of harts managed by this OpenSBI instance, i.e. the number of valid hart indexes, and a convenient iterator macro. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: sbi_scratch: Optimize hartid and scratch lookup

2025-03-24T12:26:05Z

The compiler generates much better code for sbi_hartindex_to_hartid() and sbi_hartindex_to_scratch() when using a constant for the bounds check. This works out nicely because the underlying arrays are already a constant size, so the only change needed is to fill the remainder of each array with the appropriate default/out-of-bounds value. The ellipsis in the designated initializer is a GCC extension (also supported by Clang), but avoids runtime initialization of the array. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

include: sbi: Fix typo error

2024-11-11T12:23:32Z

Fix typo in comments describing SBI_SCRATCH_FW_HEAP_SIZE_OFFSET. Signed-off-by: Zhang RunMin Reviewed-by: Anup Patel

include: sbi: Optimize reads of mhartid and mscratch

2024-10-28T05:21:37Z

csr_read() is marked as volatile and clobbering memory, which is generally the safe thing to do. However, these two CSRs do not have any side effects, and the values returned do not change between calls. The compiler can generate better code if we allow it to reorder calls to these functions and cache the return value. Introduce csr_read_relaxed() for this use case. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

include: sbi: Store the hart index in struct sbi_scratch

2024-09-25T06:30:47Z

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 Reviewed-by: Anup Patel