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x86/xen: populate boot_params with EDD data

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During early setup of a dom0 kernel, populate boot_params with the
Enhanced Disk Drive (EDD) and MBR signature data.  This makes
information on the BIOS boot device available in /sys/firmware/edd/.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
David Vrabel 2013-04-03 17:31:50 +01:00 committed by Konrad Rzeszutek Wilk
parent 31880c37c1
commit 96f28bc66a
1 changed files with 52 additions and 0 deletions
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52
arch/x86/xen/enlighten.c
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@ -31,6 +31,7 @@
#include <linux/pci.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <linux/edd.h>
#include <xen/xen.h>
#include <xen/events.h>
@ -1306,6 +1307,55 @@ static const struct machine_ops xen_machine_ops __initconst = {
.emergency_restart = xen_emergency_restart,
};
static void __init xen_boot_params_init_edd(void)
{
#if IS_ENABLED(CONFIG_EDD)
struct xen_platform_op op;
struct edd_info *edd_info;
u32 *mbr_signature;
unsigned nr;
int ret;
edd_info = boot_params.eddbuf;
mbr_signature = boot_params.edd_mbr_sig_buffer;
op.cmd = XENPF_firmware_info;
op.u.firmware_info.type = XEN_FW_DISK_INFO;
for (nr = 0; nr < EDDMAXNR; nr++) {
struct edd_info *info = edd_info + nr;
op.u.firmware_info.index = nr;
info->params.length = sizeof(info->params);
set_xen_guest_handle(op.u.firmware_info.u.disk_info.edd_params,
&info->params);
ret = HYPERVISOR_dom0_op(&op);
if (ret)
break;
#define C(x) info->x = op.u.firmware_info.u.disk_info.x
C(device);
C(version);
C(interface_support);
C(legacy_max_cylinder);
C(legacy_max_head);
C(legacy_sectors_per_track);
#undef C
}
boot_params.eddbuf_entries = nr;
op.u.firmware_info.type = XEN_FW_DISK_MBR_SIGNATURE;
for (nr = 0; nr < EDD_MBR_SIG_MAX; nr++) {
op.u.firmware_info.index = nr;
ret = HYPERVISOR_dom0_op(&op);
if (ret)
break;
mbr_signature[nr] = op.u.firmware_info.u.disk_mbr_signature.mbr_signature;
}
boot_params.edd_mbr_sig_buf_entries = nr;
#endif
}
/*
* Set up the GDT and segment registers for -fstack-protector. Until
* we do this, we have to be careful not to call any stack-protected
@ -1508,6 +1558,8 @@ asmlinkage void __init xen_start_kernel(void)
/* Avoid searching for BIOS MP tables */
x86_init.mpparse.find_smp_config = x86_init_noop;
x86_init.mpparse.get_smp_config = x86_init_uint_noop;
xen_boot_params_init_edd();
}
#ifdef CONFIG_PCI
/* PCI BIOS service won't work from a PV guest. */