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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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4
include/sbi/sbi_illegal_insn.h
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@@ -14,6 +14,10 @@
struct sbi_trap_context;
typedef int (*illegal_insn_func)(ulong insn, struct sbi_trap_regs *regs);
int truly_illegal_insn(ulong insn, struct sbi_trap_regs *regs);
int sbi_illegal_insn_handler(struct sbi_trap_context *tcntx);
#endif