This patch enables elf note based xen startup for IA-64, which gives the
kernel an early hint for running on xen like x86 case.
In order to avoid the multi entry point, presumably extending booting
protocol(i.e. extending struct ia64_boot_param) would be necessary.
It probably means that elilo also needs modification.
Signed-off-by: Qing He <qing.he@xxxxxxxxx>
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
arch/ia64/kernel/asm-offsets.c | 4 ++
arch/ia64/xen/Makefile | 3 +-
arch/ia64/xen/xen_pv_ops.c | 65 +++++++++++++++++++++++++++++++
arch/ia64/xen/xensetup.S | 83 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 154 insertions(+), 1 deletions(-)
create mode 100644 arch/ia64/xen/xen_pv_ops.c
create mode 100644 arch/ia64/xen/xensetup.S
diff --git a/arch/ia64/kernel/asm-offsets.c b/arch/ia64/kernel/asm-offsets.c
index eaa988b..742dbb1 100644
--- a/arch/ia64/kernel/asm-offsets.c
+++ b/arch/ia64/kernel/asm-offsets.c
@@ -17,6 +17,7 @@
#include <asm/mca.h>
#include <asm/xen/interface.h>
+#include <asm/xen/hypervisor.h>
#include "../kernel/sigframe.h"
#include "../kernel/fsyscall_gtod_data.h"
@@ -292,6 +293,9 @@ void foo(void)
#ifdef CONFIG_XEN
BLANK();
+ DEFINE(XEN_NATIVE_ASM, XEN_NATIVE);
+ DEFINE(XEN_PV_DOMAIN_ASM, XEN_PV_DOMAIN);
+
#define DEFINE_MAPPED_REG_OFS(sym, field) \
DEFINE(sym, (XMAPPEDREGS_OFS + offsetof(struct mapped_regs, field)))
diff --git a/arch/ia64/xen/Makefile b/arch/ia64/xen/Makefile
index eb59563..abc356f 100644
--- a/arch/ia64/xen/Makefile
+++ b/arch/ia64/xen/Makefile
@@ -2,4 +2,5 @@
# Makefile for Xen components
#
-obj-y := hypercall.o xencomm.o xcom_hcall.o grant-table.o
+obj-y := hypercall.o xensetup.o xen_pv_ops.o \
+ xencomm.o xcom_hcall.o grant-table.o
diff --git a/arch/ia64/xen/xen_pv_ops.c b/arch/ia64/xen/xen_pv_ops.c
new file mode 100644
index 0000000..77db214
--- /dev/null
+++ b/arch/ia64/xen/xen_pv_ops.c
@@ -0,0 +1,65 @@
+/******************************************************************************
+ * arch/ia64/xen/xen_pv_ops.c
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ * VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/console.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/pm.h>
+
+#include <asm/xen/hypervisor.h>
+#include <asm/xen/xencomm.h>
+#include <asm/xen/privop.h>
+
+/***************************************************************************
+ * general info
+ */
+static struct pv_info xen_info __initdata = {
+ .kernel_rpl = 2, /* or 1: determin at runtime */
+ .paravirt_enabled = 1,
+ .name = "Xen/ia64",
+};
+
+#define IA64_RSC_PL_SHIFT 2
+#define IA64_RSC_PL_BIT_SIZE 2
+#define IA64_RSC_PL_MASK \
+ (((1UL << IA64_RSC_PL_BIT_SIZE) - 1) << IA64_RSC_PL_SHIFT)
+
+static void __init
+xen_info_init(void)
+{
+ /* Xenified Linux/ia64 may run on pl = 1 or 2.
+ * determin at run time. */
+ unsigned long rsc = ia64_getreg(_IA64_REG_AR_RSC);
+ unsigned int rpl = (rsc & IA64_RSC_PL_MASK) >> IA64_RSC_PL_SHIFT;
+ xen_info.kernel_rpl = rpl;
+}
+
+/***************************************************************************
+ * pv_ops initialization
+ */
+
+void __init
+xen_setup_pv_ops(void)
+{
+ xen_info_init();
+ pv_info = xen_info;
+}
diff --git a/arch/ia64/xen/xensetup.S b/arch/ia64/xen/xensetup.S
new file mode 100644
index 0000000..28fed1f
--- /dev/null
+++ b/arch/ia64/xen/xensetup.S
@@ -0,0 +1,83 @@
+/*
+ * Support routines for Xen
+ *
+ * Copyright (C) 2005 Dan Magenheimer <dan.magenheimer@xxxxxx>
+ */
+
+#include <asm/processor.h>
+#include <asm/asmmacro.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/paravirt.h>
+#include <asm/xen/privop.h>
+#include <linux/elfnote.h>
+#include <linux/init.h>
+#include <xen/interface/elfnote.h>
+
+ .section .data.read_mostly
+ .align 8
+ .global xen_domain_type
+xen_domain_type:
+ data4 XEN_NATIVE_ASM
+ .previous
+
+ __INIT
+ENTRY(startup_xen)
+ // Calculate load offset.
+ // The constant, LOAD_OFFSET, can't be used because the boot
+ // loader doesn't always load to the LMA specified by the vmlinux.lds.
+ mov r9=ip // must be the first instruction to make sure
+ // that r9 = the physical address of startup_xen.
+ // Usually r9 = startup_xen - LOAD_OFFSET
+ movl r8=startup_xen
+ ;;
+ sub r9=r9,r8 // Usually r9 = -LOAD_OFFSET.
+
+ mov r10=PARAVIRT_HYPERVISOR_TYPE_XEN
+ movl r11=_start
+ ;;
+ add r11=r11,r9
+ movl r8=hypervisor_type
+ ;;
+ add r8=r8,r9
+ mov b0=r11
+ ;;
+ st8 [r8]=r10
+ br.cond.sptk.many b0
+ ;;
+END(startup_xen)
+
+ ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux")
+ ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6")
+ ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz "xen-3.0")
+ ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, data8.ua startup_xen -
LOAD_OFFSET)
+
+#define isBP p3 // are we the Bootstrap Processor?
+
+ .text
+
+GLOBAL_ENTRY(xen_setup_hook)
+ mov r8=XEN_PV_DOMAIN_ASM
+(isBP) movl r9=xen_domain_type;;
+(isBP) st4 [r9]=r8
+ movl r10=xen_ivt;;
+
+ mov cr.iva=r10
+
+ /* Set xsi base. */
+#define FW_HYPERCALL_SET_SHARED_INFO_VA 0x600
+(isBP) mov r2=FW_HYPERCALL_SET_SHARED_INFO_VA
+(isBP) movl r28=XSI_BASE;;
+(isBP) break 0x1000;;
+
+ /* setup pv_ops */
+(isBP) mov r4=rp
+ ;;
+(isBP) br.call.sptk.many rp=xen_setup_pv_ops
+ ;;
+(isBP) mov rp=r4
+ ;;
+
+ br.ret.sptk.many rp
+ ;;
+END(xen_setup_hook)
--
1.6.0.rc0.42.g186458
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