[PATCH rtems-libbsd 1/2] microblaze: Add AXI Ethernet support

[Alex White]

On Thu, Jan 20, 2022 at 12:30 AM Chris Johns <chrisj at rtems.org> wrote:
>
> On 20/1/22 2:54 pm, Alex White wrote:
> > From: Jennifer Averett <jennifer.averett at oarcorp.com>
> >  rtemsbsd/rtems/rtems-kernel-vmem.c            |   17 +
> > diff --git a/rtemsbsd/rtems/rtems-kernel-vmem.c b/rtemsbsd/rtems/rtems-kernel-vmem.c
> > index f64fbd17..70708902 100644
> > --- a/rtemsbsd/rtems/rtems-kernel-vmem.c
> > +++ b/rtemsbsd/rtems/rtems-kernel-vmem.c
> > @@ -41,6 +41,11 @@
> >
> >  static MALLOC_DEFINE(M_VMEM, "vmem", "VMEM buffers");
> >
> > +int vmem_add(vmem_t *vm, vmem_addr_t addr, vmem_size_t size, int flags)
> > +{
> > +     return 0;
> > +}
> > +
> >  int
> >  vmem_alloc(vmem_t *vm, vmem_size_t size, int flags, vmem_addr_t *addrp)
> >  {
> > @@ -48,6 +53,18 @@ vmem_alloc(vmem_t *vm, vmem_size_t size, int flags, vmem_addr_t *addrp)
> >       return 0;
> >  }
> >
> > +static int dummy_vmem;
> > +
> > +vmem_t *vmem_create(const char *name, vmem_addr_t base,
> > +    vmem_size_t size, vmem_size_t quantum, vmem_size_t qcache_max, int flags)
> > +{
> > +     return &dummy_vmem;
> > +}
> > +
> > +void vmem_destroy(vmem_t *vm)
> > +{
> > +}
> > +
> >  void
> >  vmem_free(vmem_t *vm, vmem_addr_t addr, vmem_size_t size)
> >  {
>
> What is pulling this interface in?

The added vmem functions are pulled in by freebsd/sys/dev/xdma/xdma.c

>
> Why have they been stubbed out?

They were stubbed out to provide the minimal implementation needed to get xdma working, and xdma
is ultimately used by the AXI Ethernet subsystem.

The alternatives we saw were to pull in the full FreeBSD vmem implementation (overkill) or modify
freebsd/sys/dev/xdma/xdma.c to not use vmem functions.

Alex

>
> Chris
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