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

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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 <samuel.holland@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Samuel Holland
2025-02-20 10:42:29 -08:00
committed by Anup Patel
parent 6b97950cf5
commit 757f7acafd
2 changed files with 16 additions and 13 deletions
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16
include/sbi/sbi_scratch.h
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@@ -210,15 +210,21 @@ do { \
#define current_hartindex() \
(sbi_scratch_thishart_ptr()->hartindex)
/** Last HART index having a sbi_scratch pointer */
extern u32 last_hartindex_having_scratch;
/** Number of harts managed by this OpenSBI instance */
extern u32 sbi_scratch_hart_count;
/** Get the number of harts managed by this OpenSBI instance */
#define sbi_hart_count() sbi_scratch_hart_count
/** Iterate over the harts managed by this OpenSBI instance */
#define sbi_for_each_hartindex(__var) \
for (u32 __var = 0; __var < sbi_hart_count(); ++__var)
/** Get last HART index having a sbi_scratch pointer */
#define sbi_scratch_last_hartindex() last_hartindex_having_scratch
#define sbi_scratch_last_hartindex() (sbi_hart_count() - 1)
/** Check whether a particular HART index is valid or not */
#define sbi_hartindex_valid(__hartindex) \
(((__hartindex) <= sbi_scratch_last_hartindex()) ? true : false)
#define sbi_hartindex_valid(__hartindex) ((__hartindex) < sbi_hart_count())
/** HART index to HART id table */
extern u32 hartindex_to_hartid_table[];