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lib: sbi: fwft: add support for SBI_FWFT_POINTER_MASKING_PMLEN

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Add support for controlling the pointer masking mode on harts which
support the Smnpm extension. This extension can only exist on harts
where XLEN >= 64 bits. This implementation selects the mode with the
smallest PMLEN that satisfies the caller's requested lower bound.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Samuel Holland
2024-08-14 01:40:30 -07:00
committed by Anup Patel
parent ebfaf1974e
commit 1cb234b1c9
5 changed files with 76 additions and 1 deletions
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3
include/sbi/sbi_ecall_interface.h
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@@ -128,7 +128,8 @@ enum sbi_fwft_feature_t {
SBI_FWFT_SHADOW_STACK = 0x2,
SBI_FWFT_DOUBLE_TRAP = 0x3,
SBI_FWFT_PTE_AD_HW_UPDATING = 0x4,
SBI_FWFT_LOCAL_RESERVED_START = 0x5,
SBI_FWFT_POINTER_MASKING_PMLEN = 0x5,
SBI_FWFT_LOCAL_RESERVED_START = 0x6,
SBI_FWFT_LOCAL_RESERVED_END = 0x3fffffff,
SBI_FWFT_LOCAL_PLATFORM_START = 0x40000000,
SBI_FWFT_LOCAL_PLATFORM_END = 0x7fffffff,