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ia64/pv_ops/xen: elf note based xen startup.

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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@intel.com>
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Isaku Yamahata 2008-10-17 11:17:58 +09:00 committed by Tony Luck
parent c7fdaf3386
commit 080104cd0f
4 changed files with 154 additions and 1 deletions
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4
arch/ia64/kernel/asm-offsets.c
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@ -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)))

3
arch/ia64/xen/Makefile
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@ -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

65
arch/ia64/xen/xen_pv_ops.c Normal file
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@ -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;
}

83
arch/ia64/xen/xensetup.S Normal file
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@ -0,0 +1,83 @@
/*
* Support routines for Xen
*
* Copyright (C) 2005 Dan Magenheimer <dan.magenheimer@hp.com>
*/
#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)