opensbi.git/lib/sbi/sbi_illegal_atomic.c, branch master

lib: atomics: fix AMO test macros

2025-12-28T15:14:03Z

The "RISC-V C API" [1] defines architecture extension test macros says naming rule for the test macros is __riscv_, where is all lower-case. Three extensions dealing with atomics implementation are: "zaamo" consists of AMO instructions, "zalrsc" - LR/SC, "a" extension means both "zaamo" and "zalrsc" Built-in test macros are __riscv_a, __riscv_zaamo and __riscv_zalrsc. Alternative to the __riscv_a macro name, __riscv_atomic, is deprecated. Use correct test macro __riscv_zaamo for the AMO variant of atomics. It used to be __riscv_atomic that is both deprecated and incorrect because it tests for the "a" extension; i.e. both "zaamo" and "zalrsc" If ISA enables only zaamo but not zalrsc, code as it was would not compile. Older toolchains may have neither __riscv_zaamo nor __riscv_zalrsc, so query __riscv_atomic - it should be treated as both __riscv_zaamo and __riscv_zalrsc, in all present cases __riscv_zaamo is more favorable so take is as alternative for __riscv_zaamo [1] https://github.com/riscv-non-isa/riscv-c-api-doc Signed-off-by: Vladimir Kondratiev Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20251228073321.1533844-1-vladimir.kondratiev@mobileye.com Signed-off-by: Anup Patel

lib: sbi: Remove redundant call to sbi_hart_expected_trap_addr()

2025-07-20T15:24:34Z

The variable "sbi_hart_expected_trap" has already been extern variable. Therefore, the program can directly refer to it instead of calling sbi_hart_expected_trap_addr(). Signed-off-by: Alvin Chang Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20250703151957.2545958-2-alvinga@andestech.com Signed-off-by: Anup Patel

lib: Emulate AMO instructions when Zaamo is not available

2025-05-20T03:48:03Z

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 Signed-off-by: Anup Patel Link: https://lore.kernel.org/r/20250519121207.976949-1-apatel@ventanamicro.com Signed-off-by: Anup Patel