[RFC patch 2/4] riscv: Get CPU manufacturer information

[Vincent Chen]

> > +void riscv_fill_cpu_manufacturer_info(void)
> > +{
> > +#ifndef CONFIG_RISCV_M_MODE
> > +       cpu_mfr_info.vendor_id = sbi_get_vendorid();
> > +       cpu_mfr_info.arch_id = sbi_get_archid();
> > +       cpu_mfr_info.imp_id = sbi_get_impid();
> > +#else
> > +       cpu_mfr_info.vendor_id = csr_read(CSR_MVENDORID);
> > +       cpu_mfr_info.arch_id = csr_read(CSR_MARCHID);
> > +       cpu_mfr_info.imp_id = csr_read(CSR_MIMPID);
> > +#endif
> How about let opensbi emulate csr_read(CSR_MXXX) for S mode, then we
> needn't to define new sbi call.
>
Hi Guo Ren,
The SBI spec has defined 3 SBI calls for S-mode to get vendorid,
archid, and impid, so I do not define new SBI calls here. The 3
functions ( sbi_get_vendorid(), sbi_get_archid(), and sbi_get_impid())
are the new kernel API to issue these 3 SBI calls.


> > +}
> > diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> > index e85bacff1b50..03621ce9092c 100644
> > --- a/arch/riscv/kernel/setup.c
> > +++ b/arch/riscv/kernel/setup.c
> > @@ -278,6 +278,8 @@ void __init setup_arch(char **cmdline_p)
> >  #endif
> >
> >         riscv_fill_hwcap();
> > +
> > +       riscv_fill_cpu_manufacturer_info();
> >  }
> >
> >  static int __init topology_init(void)
> > diff --git a/arch/riscv/kernel/soc.c b/arch/riscv/kernel/soc.c
> > index a0516172a33c..58f6fd91743a 100644
> > --- a/arch/riscv/kernel/soc.c
> > +++ b/arch/riscv/kernel/soc.c
> > @@ -6,6 +6,7 @@
> >  #include <linux/libfdt.h>
> >  #include <linux/pgtable.h>
> >  #include <asm/soc.h>
> > +#include <asm/hwcap.h>
> >
> >  /*
> >   * This is called extremly early, before parse_dtb(), to allow initializing
> > --
> > 2.7.4
> >
> How
>
> --
> Best Regards
>  Guo Ren
>
> ML: https://lore.kernel.org/linux-csky/