On 10.01.2018 22:53, David Hildenbrand wrote:
> Unfortunately, there is no easy way to simply read out the amount
> of installed memory. We have to probe (via TEST PROTECTION) for installed
> memory in a given range.
>
> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
> ---
> lib/s390x/asm/arch_def.h | 12 +++++++++++
> lib/s390x/io.c | 1 +
> lib/s390x/sclp.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
> lib/s390x/sclp.h | 1 +
> s390x/Makefile | 1 +
> 5 files changed, 67 insertions(+)
> create mode 100644 lib/s390x/sclp.c
>
> diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h
> index 72e5c60..ae27ab2 100644
> --- a/lib/s390x/asm/arch_def.h
> +++ b/lib/s390x/asm/arch_def.h
> @@ -151,4 +151,16 @@ struct cpuid {
> uint64_t reserved : 15;
> };
>
> +static inline int tprot(unsigned long addr)
> +{
> + int cc;
> +
> + asm volatile(
> + " tprot %1,0\n"
> + " ipm %0\n"
> + " srl %0,28\n"
> + : "=d" (cc) : "Q" (addr) : "cc");
> + return cc;
> +}
> +
> #endif
> diff --git a/lib/s390x/io.c b/lib/s390x/io.c
> index 3121a78..eb4d171 100644
> --- a/lib/s390x/io.c
> +++ b/lib/s390x/io.c
> @@ -43,6 +43,7 @@ void setup()
> setup_args_progname(ipl_args);
> setup_facilities();
> sclp_ascii_setup();
> + sclp_memory_setup();
> }
>
> void exit(int code)
> diff --git a/lib/s390x/sclp.c b/lib/s390x/sclp.c
> new file mode 100644
> index 0000000..ee56820
> --- /dev/null
> +++ b/lib/s390x/sclp.c
> @@ -0,0 +1,52 @@
> +/*
> + * s390x SCLP driver
> + *
> + * Copyright (c) 2017 Red Hat Inc
> + *
> + * Authors:
> + * David Hildenbrand <david@xxxxxxxxxx>
> + *
> + * This code is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU Library General Public License version 2.
> + */
> +
> +#include <libcflat.h>
> +#include <asm/page.h>
> +#include <asm/arch_def.h>
> +#include "sclp.h"
> +
> +static char _sccb[PAGE_SIZE] __attribute__((__aligned__(4096)));
Could we maybe re-use the sccb buffer from sclp-write.c ?
Maybe it would also make sense to merge sclp-write.c with sclp.c ?
Thomas
