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/*
* Xen domain builder -- ARM zImage bits
*
* Parse and load ARM zImage kernel images.
*
* Copyright (C) 2012, Citrix Systems.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include "xg_private.h"
#include "xc_dom.h"
#include <arpa/inet.h> /* XXX ntohl is not the right function... */
/*
* Guest virtual RAM starts here. This must be consistent with the DTB
* appended to the guest kernel.
*/
#define GUEST_RAM_BASE 0x80000000
#define ZIMAGE_MAGIC_OFFSET 0x24
#define ZIMAGE_START_OFFSET 0x28
#define ZIMAGE_END_OFFSET 0x2c
#define ZIMAGE_MAGIC 0x016f2818
struct minimal_dtb_header {
uint32_t magic;
uint32_t total_size;
/* There are other fields but we don't use them yet. */
};
#define DTB_MAGIC 0xd00dfeed
static int xc_dom_probe_zimage_kernel(struct xc_dom_image *dom)
{
uint32_t *zimage;
uint32_t end;
if ( dom->kernel_blob == NULL )
{
xc_dom_panic(dom->xch, XC_INTERNAL_ERROR,
"%s: no kernel image loaded", __FUNCTION__);
return -EINVAL;
}
if ( dom->kernel_size < 0x30 /*sizeof(struct setup_header)*/ )
{
xc_dom_printf(dom->xch, "%s: kernel image too small", __FUNCTION__);
return -EINVAL;
}
zimage = (uint32_t *)dom->kernel_blob;
if ( zimage[ZIMAGE_MAGIC_OFFSET/4] != ZIMAGE_MAGIC )
{
xc_dom_printf(dom->xch, "%s: kernel is not a bzImage", __FUNCTION__);
return -EINVAL;
}
end = zimage[ZIMAGE_END_OFFSET/4];
/*
* Check for an appended DTB.
*/
if ( end + sizeof(struct minimal_dtb_header) < dom->kernel_size ) {
struct minimal_dtb_header *dtb_hdr;
dtb_hdr = (struct minimal_dtb_header *)(dom->kernel_blob + end);
if (ntohl/*be32_to_cpu*/(dtb_hdr->magic) == DTB_MAGIC) {
xc_dom_printf(dom->xch, "%s: found an appended DTB", __FUNCTION__);
end += ntohl/*be32_to_cpu*/(dtb_hdr->total_size);
}
}
dom->kernel_size = end;
return 0;
}
static int xc_dom_parse_zimage_kernel(struct xc_dom_image *dom)
{
uint32_t *zimage;
uint32_t start, entry_addr;
uint64_t v_start, v_end;
uint64_t rambase = GUEST_RAM_BASE;
DOMPRINTF_CALLED(dom->xch);
zimage = (uint32_t *)dom->kernel_blob;
dom->rambase_pfn = rambase >> XC_PAGE_SHIFT;
/* Do not load kernel at the very first RAM address */
v_start = rambase + 0x8000;
v_end = v_start + dom->kernel_size;
start = zimage[ZIMAGE_START_OFFSET/4];
if (start == 0)
entry_addr = v_start;
else
entry_addr = start;
/* find kernel segment */
dom->kernel_seg.vstart = v_start;
dom->kernel_seg.vend = v_end;
dom->parms.virt_entry = entry_addr;
dom->parms.virt_base = rambase;
dom->guest_type = "xen-3.0-armv7l";
DOMPRINTF("%s: %s: RAM starts at %"PRI_xen_pfn,
__FUNCTION__, dom->guest_type, dom->rambase_pfn);
DOMPRINTF("%s: %s: 0x%" PRIx64 " -> 0x%" PRIx64 "",
__FUNCTION__, dom->guest_type,
dom->kernel_seg.vstart, dom->kernel_seg.vend);
return 0;
}
static int xc_dom_load_zimage_kernel(struct xc_dom_image *dom)
{
void *dst;
DOMPRINTF_CALLED(dom->xch);
dst = xc_dom_seg_to_ptr(dom, &dom->kernel_seg);
if ( dst == NULL )
{
DOMPRINTF("%s: xc_dom_seg_to_ptr(dom, &dom->kernel_seg) => NULL",
__func__);
return -1;
}
DOMPRINTF("%s: kernel sed %#"PRIx64"-%#"PRIx64,
__func__, dom->kernel_seg.vstart, dom->kernel_seg.vend);
DOMPRINTF("%s: copy %zd bytes from blob %p to dst %p",
__func__, dom->kernel_size, dom->kernel_blob, dst);
memcpy(dst, dom->kernel_blob, dom->kernel_size);
return 0;
}
static struct xc_dom_loader zimage_loader = {
.name = "Linux zImage (ARM)",
.probe = xc_dom_probe_zimage_kernel,
.parser = xc_dom_parse_zimage_kernel,
.loader = xc_dom_load_zimage_kernel,
};
static void __init register_loader(void)
{
xc_dom_register_loader(&zimage_loader);
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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