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Date: Fri, 10 Aug 2018 00:38:16 -0300
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Subject: Re: [Qemu-devel] [Qemu-arm] [PATCH v4 2/6] target/arm: add
 "cortex-m0" CPU model
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To: Stefan Hajnoczi <stefanha@redhat.com>, qemu-devel@nongnu.org
Cc: Peter Maydell <peter.maydell@linaro.org>, jim@groklearning.com, mail@steffen-goertz.de, Su Hang <suhang16@mails.ucas.ac.cn>, ilg@livius.net, Alistair Francis <alistair@alistair23.me>, Subbaraya Sundeep <sundeep.lkml@gmail.com>, Steffen Gortz <qemu.ml@steffen-goertz.de>, qemu-arm@nongnu.org, Joel Stanley <joel@jms.id.au>, jusual@mail.ru

On 08/03/2018 11:47 AM, Stefan Hajnoczi wrote:
> Define a "cortex-m0" ARMv6-M CPU model.
> 
> Most of the register reset values set by other CPU models are not
> relevant for the cut-down ARMv6-M architecture.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

> ---
>  target/arm/cpu.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/target/arm/cpu.c b/target/arm/cpu.c
> index 3848ef46aa..7e477c0d23 100644
> --- a/target/arm/cpu.c
> +++ b/target/arm/cpu.c
> @@ -1255,6 +1255,15 @@ static void arm11mpcore_initfn(Object *obj)
>      cpu->reset_auxcr = 1;
>  }
>  
> +static void cortex_m0_initfn(Object *obj)
> +{
> +    ARMCPU *cpu = ARM_CPU(obj);
> +    set_feature(&cpu->env, ARM_FEATURE_V6);
> +    set_feature(&cpu->env, ARM_FEATURE_M);
> +
> +    cpu->midr = 0x410cc200;
> +}
> +
>  static void cortex_m3_initfn(Object *obj)
>  {
>      ARMCPU *cpu = ARM_CPU(obj);
> @@ -1845,6 +1854,8 @@ static const ARMCPUInfo arm_cpus[] = {
>      { .name = "arm1136",     .initfn = arm1136_initfn },
>      { .name = "arm1176",     .initfn = arm1176_initfn },
>      { .name = "arm11mpcore", .initfn = arm11mpcore_initfn },
> +    { .name = "cortex-m0",   .initfn = cortex_m0_initfn,
> +                             .class_init = arm_v7m_class_init },
>      { .name = "cortex-m3",   .initfn = cortex_m3_initfn,
>                               .class_init = arm_v7m_class_init },
>      { .name = "cortex-m4",   .initfn = cortex_m4_initfn,
>