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lib: sbi_scratch: Apply bounds check to platform hart_count

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The internal limit on the number of harts is SBI_HARTMASK_MAX_BITS, as
this value determines the size of various bitmaps and arrays (including
hartindex_to_hartid_table and hartindex_to_scratch_table). Clamp the
value provided by the platform, and drop the extra array element.

Update the documentation to indicate that hart_index2id must be sized
based on hart_count, and that hart indexes must be contiguous. As of
commit 5e90e54a1a ("lib: utils:Check that hartid is valid"), there is
no restriction on the valid hart ID values.

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 10:42:27 -08:00
committed by Anup Patel
parent 86c01a73ff
commit ef4ed2dda7
2 changed files with 12 additions and 13 deletions
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11
include/sbi/sbi_platform.h
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@@ -169,7 +169,7 @@ struct sbi_platform {
char name[64];
/** Supported features */
u64 features;
/** Total number of HARTs */
/** Total number of HARTs (at most SBI_HARTMASK_MAX_BITS) */
u32 hart_count;
/** Per-HART stack size for exception/interrupt handling */
u32 hart_stack_size;
@@ -184,17 +184,12 @@ struct sbi_platform {
/**
* HART index to HART id table
*
* For used HART index <abc>:
* If hart_index2id != NULL then the table must contain a mapping
* for each HART index 0 <= <abc> < hart_count:
* hart_index2id[<abc>] = some HART id
* For unused HART index <abc>:
* hart_index2id[<abc>] = -1U
*
* If hart_index2id == NULL then we assume identity mapping
* hart_index2id[<abc>] = <abc>
*
* We have only two restrictions:
* 1. HART index < sbi_platform hart_count
* 2. HART id < SBI_HARTMASK_MAX_BITS
*/
const u32 *hart_index2id;
};