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lib: Emulate AMO instructions when Zaamo is not available

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The AMO instructions are very critical for Linux so allow low-end
RISC-V implementations without Zaamo to boot Linux by emulating AMO
instructions using Zalrsc when OpenSBI is compiled without Zaamo.

Signed-off-by: Chao-ying Fu <cfu@mips.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Link: https://lore.kernel.org/r/20250519121207.976949-1-apatel@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Chao-ying Fu
2025-05-19 17:42:06 +05:30
committed by Anup Patel
parent 017a161788
commit 8a3071222a
6 changed files with 709 additions and 18 deletions
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lib/sbi/objects.mk
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@@ -79,6 +79,7 @@ libsbi-objs-y += sbi_heap.o
libsbi-objs-y += sbi_math.o
libsbi-objs-y += sbi_hfence.o
libsbi-objs-y += sbi_hsm.o
libsbi-objs-y += sbi_illegal_atomic.o
libsbi-objs-y += sbi_illegal_insn.o
libsbi-objs-y += sbi_init.o
libsbi-objs-y += sbi_ipi.o