On Mon, 22 Apr 2013 21:18:11 +0200 Alexander Graf <ag...@suse.de> wrote:
> This C file is the main driving piece of the s390 ccw firmware. It > provides a search for a workable block device, sets it as the default > to boot off of and boots from it. > > Signed-off-by: Alexander Graf <ag...@suse.de> > --- > pc-bios/s390-ccw/main.c | 56 > +++++++++++++++++++++++++++++++++++++++++++++++ > 1 files changed, 56 insertions(+), 0 deletions(-) > create mode 100644 pc-bios/s390-ccw/main.c > > diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c > new file mode 100644 > index 0000000..0913aac > --- /dev/null > +++ b/pc-bios/s390-ccw/main.c > @@ -0,0 +1,56 @@ > +/* > + * S390 virtio-ccw loading program > + * > + * Copyright (c) 2013 Alexander Graf <ag...@suse.de> > + * > + * This work is licensed under the terms of the GNU GPL, version 2 or (at > + * your option) any later version. See the COPYING file in the top-level > + * directory. > + */ > + > +#include "s390-ccw.h" > + > +struct subchannel_id blk_schid; > +char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); > + > +void virtio_panic(const char *string) > +{ > + sclp_print(string); > + while (1) { } > +} > + > +static void virtio_setup(void) > +{ > + struct irb irb; > + int i; > + int r; > + bool found = false; > + > + blk_schid.one = 1; > + > + for (i = 0; i < 0x10000; i++) { > + blk_schid.sch_no = i; > + r = tsch(blk_schid, &irb); You want to do a stsch() loop here, not a tsch() loop :) As a bonus, you can exit the loop on cc == 3. r = stsch(blk_schid, &schib); if (r == 3) { break; } > + if (r != 3) { if (schib.pmcw.dnv) { > + if (virtio_is_blk(blk_schid)) { > + found = true; > + break; > + } > + } > + } > + > + if (!found) { > + virtio_panic("No virtio-blk device found!\n"); > + } > + > + virtio_setup_block(blk_schid); The virtio_is_blk() and virtio_setup_block() functions should go into a preceding patch, no? > +} > + > +int main(void) > +{ > + sclp_setup(); > + virtio_setup(); > + if (zipl_load() < 0) > + sclp_print("Failed to load OS from hard disk\n"); > + while (1) { } > +}