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Current hart ISA ("riscv,isa") parser don't correctly parse:
1. Multi-letter extensions
2. Version numbers
All ISA extensions ratified recently has multi-letter extensions
(except 'H'). The current "riscv,isa" parser that is easily confused
by multi-letter extensions and "p" in version numbers can be a huge
problem for adding new extensions through the device tree.
Leaving it would create incompatible hacks and would make "riscv,isa"
value unreliable.
This commit implements minimal parser for "riscv,isa" strings. With this,
we can safely ignore multi-letter extensions and version numbers.
[Improved commit text and fixed a bug around 's' in base extension]
Signed-off-by: Atish Patra <atishp@rivosinc.com>
[Fixed workaround for QEMU]
Signed-off-by: Tsukasa OI <research_trasio@irq.a4lg.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2a31c54be0