Re: [PATCH] hw/intc: Fix incorrect calculation of core in liointc_read() and liointc_write()

[Jiaxun Yang <jiaxun.yang@flygoat.com>]

在 2020/11/3 17:32, AlexChen 写道:
> According to the loongson spec
> (http://www.loongson.cn/uploadfile/cpu/3B1500/Loongson_3B1500_cpu_user_1.pdf)
> and the macro definition(#define R_PERCORE_ISR(x) (0x40 + 0x8 * x)), we know
> that the ISR size of per CORE is 8, so here we need to divide
> (addr - R_PERCORE_ISR(0)) by 8, not 4.
Hi Alex

Thanks!

That was my fault.. Per Core ISA is rarely used by kernel..

Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
> Reported-by: Euler Robot <euler.robot@huawei.com>
Btw:
How can you discover this by robot?
Huawei owns real artifical intelligence technology lol :-）


- Jiaxun
> Signed-off-by: Alex Chen <alex.chen@huawei.com>
> ---
>   hw/intc/loongson_liointc.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/hw/intc/loongson_liointc.c b/hw/intc/loongson_liointc.c
> index 30fb375b72..fbbfb57ee9 100644
> --- a/hw/intc/loongson_liointc.c
> +++ b/hw/intc/loongson_liointc.c
> @@ -130,7 +130,7 @@ liointc_read(void *opaque, hwaddr addr, unsigned int size)
>
>       if (addr >= R_PERCORE_ISR(0) &&
>           addr < R_PERCORE_ISR(NUM_CORES)) {
> -        int core = (addr - R_PERCORE_ISR(0)) / 4;
> +        int core = (addr - R_PERCORE_ISR(0)) / 8;
>           r = p->per_core_isr[core];
>           goto out;
>       }
> @@ -173,7 +173,7 @@ liointc_write(void *opaque, hwaddr addr,
>
>       if (addr >= R_PERCORE_ISR(0) &&
>           addr < R_PERCORE_ISR(NUM_CORES)) {
> -        int core = (addr - R_PERCORE_ISR(0)) / 4;
> +        int core = (addr - R_PERCORE_ISR(0)) / 8;
>           p->per_core_isr[core] = value;
>           goto out;
>       }