On Thu, 2009-03-12 at 11:58 -0500, William Pitcock wrote: > On Wed, 2009-03-11 at 07:57 +0000, Ian Campbell wrote: > > Oh, hang, on, you aren't trying to load a bzImage dom0 kernel are you? > > Yes, I am. But, we need to make sure that squeeze ships with support for > this.
Given the timescales involved it certainly will since Xen 3.4 is due
fairly soon (a matter of months I guess).
> I suppose I could feed the hypervisor the raw vmlinux binary on a
> production-like machine in the meantime. That should work. At least,
> that's what we do for non-pvops kernels.
Yes, you could even strip+gzip it, which is all the 2.6.18-xen build
system does. Or the attached bzexplode.c will even extract the necessary
bits from a bzImage for you if that's all you have.
Ian.
--
Ian Campbell
Since we're all here, we must not be all there.
-- Bob "Mountain" Beck
#include <stdio.h>
#include <fcntl.h>
#include <stdint.h>
#include <unistd.h>
#include <inttypes.h>
#include <err.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
int main(int argc, char **argv)
{
int fd;
struct stat sb;
void *p;
uint8_t *hdr;
int setup_sectors;
uint32_t compressed_payload_offset;
uint32_t compressed_payload_length;
if (argc != 2)
errx(1, "usage: bzexplode <bzImage>");
fd = open(argv[1], O_RDONLY);
if (fd < 0)
err(1, "open");
if (fstat(fd, &sb) < 0)
err(1, "fstat");
p = mmap(0, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (p == MAP_FAILED)
err(1, "mmap");
hdr = p;
setup_sectors = hdr[0x1f1];
compressed_payload_offset = *(uint32_t*)&hdr[0x248];
fprintf(stderr, "setup sectors %d\n", setup_sectors);
compressed_payload_offset += (setup_sectors+1) * 512;
//compressed_payload_length = *(uint32_t*)(p + compressed_payload_offset - 4);
compressed_payload_length = *(uint32_t*)&hdr[0x24c];
fprintf(stderr, "compressed_payload_offset %"PRIx32" (abs)\n",
compressed_payload_offset);
fprintf(stderr, "compressed_payload_length %"PRIx32"\n",
compressed_payload_length);
write(1,
p + compressed_payload_offset,
compressed_payload_length);
return 0;
}
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