Subject: Obtain EDD info from Xen
Taken from our 2.6.22-rc4 tree and made apply - without further testing.
The patch contains the necessary adjustment to the public headers - if
that's being pushed to the linux tree automatically, the respective hunk
must be removed before applying.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Index: head-2007-05-31/arch/i386/kernel/setup-xen.c
===================================================================
--- head-2007-05-31.orig/arch/i386/kernel/setup-xen.c 2007-06-04
14:09:07.000000000 +0200
+++ head-2007-05-31/arch/i386/kernel/setup-xen.c 2007-06-01
16:59:22.000000000 +0200
@@ -66,6 +66,7 @@
#include <xen/interface/physdev.h>
#include <xen/interface/memory.h>
#include <xen/features.h>
+#include <xen/firmware.h>
#include <xen/xencons.h>
#include <setup_arch.h>
#include <bios_ebda.h>
@@ -170,6 +171,7 @@ struct edd edd;
#ifdef CONFIG_EDD_MODULE
EXPORT_SYMBOL(edd);
#endif
+#ifndef CONFIG_XEN
/**
* copy_edd() - Copy the BIOS EDD information
* from boot_params into a safe place.
@@ -182,6 +184,7 @@ static inline void copy_edd(void)
edd.mbr_signature_nr = EDD_MBR_SIG_NR;
edd.edd_info_nr = EDD_NR;
}
+#endif
#else
static inline void copy_edd(void)
{
Index: head-2007-05-31/arch/x86_64/kernel/setup-xen.c
===================================================================
--- head-2007-05-31.orig/arch/x86_64/kernel/setup-xen.c 2007-06-04
14:09:07.000000000 +0200
+++ head-2007-05-31/arch/x86_64/kernel/setup-xen.c 2007-06-01
16:59:22.000000000 +0200
@@ -71,6 +71,7 @@
#include <asm/hypervisor.h>
#include <xen/interface/nmi.h>
#include <xen/features.h>
+#include <xen/firmware.h>
#include <xen/xencons.h>
#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
#define PFN_PHYS(x) ((x) << PAGE_SHIFT)
@@ -225,6 +226,7 @@ struct edd edd;
#ifdef CONFIG_EDD_MODULE
EXPORT_SYMBOL(edd);
#endif
+#ifndef CONFIG_XEN
/**
* copy_edd() - Copy the BIOS EDD information
* from boot_params into a safe place.
@@ -237,6 +239,7 @@ static inline void copy_edd(void)
edd.mbr_signature_nr = EDD_MBR_SIG_NR;
edd.edd_info_nr = EDD_NR;
}
+#endif
#else
static inline void copy_edd(void)
{
Index: head-2007-05-31/drivers/firmware/Kconfig
===================================================================
--- head-2007-05-31.orig/drivers/firmware/Kconfig 2007-06-04
14:09:07.000000000 +0200
+++ head-2007-05-31/drivers/firmware/Kconfig 2007-06-01 16:59:22.000000000
+0200
@@ -8,7 +8,6 @@ menu "Firmware Drivers"
config EDD
tristate "BIOS Enhanced Disk Drive calls determine boot disk"
depends on !IA64
- depends on !XEN
help
Say Y or M here if you want to enable BIOS Enhanced Disk Drive
Services real mode BIOS calls to determine which disk
Index: head-2007-05-31/drivers/xen/core/Makefile
===================================================================
--- head-2007-05-31.orig/drivers/xen/core/Makefile 2007-06-04
14:09:07.000000000 +0200
+++ head-2007-05-31/drivers/xen/core/Makefile 2007-06-04 14:09:17.000000000
+0200
@@ -2,7 +2,7 @@
# Makefile for the linux kernel.
#
-obj-y := evtchn.o gnttab.o features.o reboot.o machine_reboot.o
+obj-y := evtchn.o gnttab.o features.o reboot.o machine_reboot.o firmware.o
obj-$(CONFIG_PROC_FS) += xen_proc.o
obj-$(CONFIG_SYSFS) += hypervisor_sysfs.o
Index: head-2007-05-31/drivers/xen/core/firmware.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ head-2007-05-31/drivers/xen/core/firmware.c 2007-06-01 16:59:22.000000000
+0200
@@ -0,0 +1,61 @@
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/edd.h>
+#include <xen/interface/platform.h>
+#include <asm/hypervisor.h>
+
+#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
+void __init copy_edd(void)
+{
+ int ret;
+ xen_platform_op_t op;
+
+ if (!is_initial_xendomain())
+ return;
+
+ op.cmd = XENPF_firmware_info;
+
+ for (op.u.firmware_info.index = 0, ret = 0;
+ ret != -ESRCH && ret != -ENOSYS && edd.edd_info_nr < EDDMAXNR;
+ ++op.u.firmware_info.index) {
+ struct edd_info *info = edd.edd_info + edd.edd_info_nr;
+
+ op.u.firmware_info.type = XEN_FW_EDD_INFO;
+ ret = HYPERVISOR_platform_op(&op);
+ if (ret)
+ continue;
+ info->device = op.u.firmware_info.u.edd_info.device;
+ info->version = op.u.firmware_info.u.edd_info.version;
+ info->interface_support =
op.u.firmware_info.u.edd_info.interface;
+
+ op.u.firmware_info.type = XEN_FW_DISK_INFO;
+ ret = HYPERVISOR_platform_op(&op);
+ if (ret)
+ continue;
+ info->legacy_max_cylinder =
op.u.firmware_info.u.disk_info.max_cylinder;
+ info->legacy_max_head =
op.u.firmware_info.u.disk_info.max_head;
+ info->legacy_sectors_per_track =
op.u.firmware_info.u.disk_info.sectors_per_track;
+
+ op.u.firmware_info.type = XEN_FW_EDD_PARAMS;
+ info->params.length = sizeof(info->params);
+ set_xen_guest_handle(op.u.firmware_info.u.edd_params,
&info->params);
+ ret = HYPERVISOR_platform_op(&op);
+ if (ret)
+ continue;
+
+ ++edd.edd_info_nr;
+ }
+
+ op.u.firmware_info.type = XEN_FW_MBR_SIGNATURE;
+ for (op.u.firmware_info.index = 0, ret = 0;
+ ret != -ESRCH && ret != -ENOSYS && edd.mbr_signature_nr <
EDD_MBR_SIG_MAX;
+ ++op.u.firmware_info.index) {
+
+ ret = HYPERVISOR_platform_op(&op);
+ if (ret)
+ continue;
+ edd.mbr_signature[edd.mbr_signature_nr++] =
op.u.firmware_info.u.mbr_signature;
+ }
+}
+#endif
Index: head-2007-05-31/include/xen/firmware.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ head-2007-05-31/include/xen/firmware.h 2007-06-01 16:59:22.000000000
+0200
@@ -0,0 +1,6 @@
+#ifndef __XEN_FIRMWARE_H__
+#define __XEN_FIRMWARE_H__
+
+void copy_edd(void);
+
+#endif /* __XEN_FIRMWARE_H__ */
Index: head-2007-05-31/include/xen/interface/platform.h
===================================================================
--- head-2007-05-31.orig/include/xen/interface/platform.h 2007-06-04
14:09:07.000000000 +0200
+++ head-2007-05-31/include/xen/interface/platform.h 2007-06-01
16:59:22.000000000 +0200
@@ -114,6 +114,35 @@ struct xenpf_platform_quirk {
typedef struct xenpf_platform_quirk xenpf_platform_quirk_t;
DEFINE_XEN_GUEST_HANDLE(xenpf_platform_quirk_t);
+#define XENPF_firmware_info 50
+#define XEN_FW_DISK_INFO 1 /* from int 13 AH=08 */
+#define XEN_FW_EDD_INFO 2 /* from int 13 AH=41 */
+#define XEN_FW_EDD_PARAMS 3 /* from int 13 AH=48 */
+#define XEN_FW_MBR_SIGNATURE 4
+struct xenpf_firmware_info {
+ /* IN variables. */
+ uint32_t type;
+ uint32_t index;
+ /* OUT variables. */
+ union {
+ struct {
+ uint16_t max_cylinder;
+ uint8_t max_head;
+ uint8_t sectors_per_track;
+ } disk_info;
+ struct {
+ uint8_t device;
+ uint8_t version;
+ uint16_t interface;
+ } edd_info;
+ /* first uint16_t of buffer must be set to buffer size */
+ XEN_GUEST_HANDLE(void) edd_params;
+ uint32_t mbr_signature;
+ } u;
+};
+typedef struct xenpf_firmware_info xenpf_firmware_info_t;
+DEFINE_XEN_GUEST_HANDLE(xenpf_firmware_info_t);
+
struct xen_platform_op {
uint32_t cmd;
uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
@@ -124,6 +153,7 @@ struct xen_platform_op {
struct xenpf_read_memtype read_memtype;
struct xenpf_microcode_update microcode;
struct xenpf_platform_quirk platform_quirk;
+ struct xenpf_firmware_info firmware_info;
uint8_t pad[128];
} u;
};
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