[U-Boot] [PATCH v2 32/38] x86: fsp: Save usable RAM and hob_list in the handoff area

[Bin Meng]

On Wed, Oct 2, 2019 at 10:07 PM Bin Meng <bmeng.cn at gmail.com> wrote:
>
> Hi Simon,
>
> On Wed, Sep 25, 2019 at 10:13 PM Simon Glass <sjg at chromium.org> wrote:
> >
> > The useable RAM is calculated when the RAM is inited. Save this value so
> > that it can be easily used in U-Boot proper.
> >
> > Also save a pointer to the hob list so that it is accessible (before
> > relocation only) in U-Boot proper. This avoids having to scan it in SPL,
> > for everything U-Boot proper might need later.
> >
> > Signed-off-by: Simon Glass <sjg at chromium.org>
> > ---
> >
> > Changes in v2: None
> >
> >  arch/x86/cpu/intel_common/cpu_from_spl.c |  6 ++++++
> >  arch/x86/include/asm/handoff.h           |  8 ++++++++
> >  arch/x86/lib/fsp/fsp_dram.c              | 10 ++++++++++
> >  3 files changed, 24 insertions(+)
> >
> > diff --git a/arch/x86/cpu/intel_common/cpu_from_spl.c b/arch/x86/cpu/intel_common/cpu_from_spl.c
> > index a6233c75ce2..b7bb524162f 100644
> > --- a/arch/x86/cpu/intel_common/cpu_from_spl.c
> > +++ b/arch/x86/cpu/intel_common/cpu_from_spl.c
> > @@ -6,6 +6,7 @@
> >  #include <common.h>
> >  #include <dm.h>
> >  #include <errno.h>
> > +#include <handoff.h>
> >  #include <asm/cpu_common.h>
> >  #include <asm/intel_regs.h>
> >  #include <asm/lapic.h>
> > @@ -21,6 +22,11 @@ int arch_cpu_init(void)
> >  {
> >         int ret;
> >
> > +#if CONFIG_IS_ENABLED(HANDOFF) && IS_ENABLED(CONFIG_USE_HOB)
> > +       struct spl_handoff *ho = gd->spl_handoff;
> > +
> > +       gd->arch.hob_list = ho->arch.hob_list;
>
> We should guard the access to gd->arch.hob_list with #ifdef CONFIG_USE_HOB.
>
> > +#endif
> >         ret = x86_cpu_reinit_f();
> >
> >         return ret;
> > diff --git a/arch/x86/include/asm/handoff.h b/arch/x86/include/asm/handoff.h
> > index 4d18d59efed..aec49b9b815 100644
> > --- a/arch/x86/include/asm/handoff.h
> > +++ b/arch/x86/include/asm/handoff.h
> > @@ -9,7 +9,15 @@
> >  #ifndef __x86_asm_handoff_h
> >  #define __x86_asm_handoff_h
> >
> > +/**
> > + * struct arch_spl_handoff - architecture-specific handoff info
> > + *
> > + * @usable_ram_top: Value returned by board_get_usable_ram_top() in SPL
> > + * @hob_list: Start of FSP hand-off blocks (HOBs)
> > + */
> >  struct arch_spl_handoff {
> > +       ulong usable_ram_top;
> > +       void *hob_list;
>
> ditto
>
> >  };
> >
> >  #endif
> > diff --git a/arch/x86/lib/fsp/fsp_dram.c b/arch/x86/lib/fsp/fsp_dram.c
> > index 8fe1e0bf73d..38cc25839ec 100644
> > --- a/arch/x86/lib/fsp/fsp_dram.c
> > +++ b/arch/x86/lib/fsp/fsp_dram.c
> > @@ -88,3 +88,13 @@ unsigned int install_e820_map(unsigned int max_entries,
> >
> >         return num_entries;
> >  }
> > +
> > +#if CONFIG_IS_ENABLED(HANDOFF)
> > +int handoff_arch_save(struct spl_handoff *ho)
> > +{
> > +       ho->arch.usable_ram_top = fsp_get_usable_lowmem_top(gd->arch.hob_list);
> > +       ho->arch.hob_list = gd->arch.hob_list;
>
> ditto
>
> > +
> > +       return 0;
> > +}
> > +#endif
> > --
>

I will fix the above issues when applying.

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>