linux/arch/ia64/xen/xensetup.S
Isaku Yamahata 080104cd0f ia64/pv_ops/xen: elf note based xen startup.
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>
2008-10-17 10:02:21 -07:00

84 lines
1.8 KiB
ArmAsm

/*
* 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)