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Re: [RFC 15/15] target/riscv: rvb: support and turn on B-extension from


From: Frank Chang
Subject: Re: [RFC 15/15] target/riscv: rvb: support and turn on B-extension from command line
Date: Mon, 23 Nov 2020 09:22:15 +0800

On Sat, Nov 21, 2020 at 12:24 AM Alistair Francis <alistair23@gmail.com> wrote:


On 19/11/2020 7:02 pm, Kito Cheng wrote:
>> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
>> index 0bbfd7f4574..bc29e118c6d 100644
>> --- a/target/riscv/cpu.c
>> +++ b/target/riscv/cpu.c
>> @@ -438,6 +438,9 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp)
>>           if (cpu->cfg.ext_h) {
>>               target_misa |= RVH;
>>           }
>> +        if (cpu->cfg.ext_b) {
>> +            target_misa |= RVB;
>> +        }
>>           if (cpu->cfg.ext_v) {
>>               target_misa |= RVV;
>>               if (!is_power_of_2(cpu->cfg.vlen)) {
>> @@ -515,6 +518,7 @@ static Property riscv_cpu_properties[] = {
>>       DEFINE_PROP_BOOL("s", RISCVCPU, cfg.ext_s, true),
>>       DEFINE_PROP_BOOL("u", RISCVCPU, cfg.ext_u, true),
>>       /* This is experimental so mark with 'x-' */
>> +    DEFINE_PROP_BOOL("x-b", RISCVCPU, cfg.ext_b, true),
>
> I think the default value should be false?

Good catch, I missed that.

Yes it should be false.

Alistair

Thanks, I'll fix it in my next patchset.

Frank Chang
 

>
>>       DEFINE_PROP_BOOL("x-h", RISCVCPU, cfg.ext_h, false),
>>       DEFINE_PROP_BOOL("x-v", RISCVCPU, cfg.ext_v, false),
>>       DEFINE_PROP_BOOL("Counters", RISCVCPU, cfg.ext_counters, true),
>

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