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authorIsaku Yamahata <yamahata@valinux.co.jp>2008-10-16 22:17:58 -0400
committerTony Luck <tony.luck@intel.com>2008-10-17 13:02:21 -0400
commit080104cd0f708b6bb5a121922801867a29ad63fc (patch)
tree119f220c954dc731322ff759fcfb5ae0a8836a75 /arch/ia64/xen/xensetup.S
parentc7fdaf338679f5e0343bfdfa7ae1e2fdb41ff0b1 (diff)
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>
Diffstat (limited to 'arch/ia64/xen/xensetup.S')
-rw-r--r--arch/ia64/xen/xensetup.S83
1 files changed, 83 insertions, 0 deletions
diff --git a/arch/ia64/xen/xensetup.S b/arch/ia64/xen/xensetup.S
new file mode 100644
index 000000000000..28fed1fcc079
--- /dev/null
+++ b/arch/ia64/xen/xensetup.S
@@ -0,0 +1,83 @@
1/*
2 * Support routines for Xen
3 *
4 * Copyright (C) 2005 Dan Magenheimer <dan.magenheimer@hp.com>
5 */
6
7#include <asm/processor.h>
8#include <asm/asmmacro.h>
9#include <asm/pgtable.h>
10#include <asm/system.h>
11#include <asm/paravirt.h>
12#include <asm/xen/privop.h>
13#include <linux/elfnote.h>
14#include <linux/init.h>
15#include <xen/interface/elfnote.h>
16
17 .section .data.read_mostly
18 .align 8
19 .global xen_domain_type
20xen_domain_type:
21 data4 XEN_NATIVE_ASM
22 .previous
23
24 __INIT
25ENTRY(startup_xen)
26 // Calculate load offset.
27 // The constant, LOAD_OFFSET, can't be used because the boot
28 // loader doesn't always load to the LMA specified by the vmlinux.lds.
29 mov r9=ip // must be the first instruction to make sure
30 // that r9 = the physical address of startup_xen.
31 // Usually r9 = startup_xen - LOAD_OFFSET
32 movl r8=startup_xen
33 ;;
34 sub r9=r9,r8 // Usually r9 = -LOAD_OFFSET.
35
36 mov r10=PARAVIRT_HYPERVISOR_TYPE_XEN
37 movl r11=_start
38 ;;
39 add r11=r11,r9
40 movl r8=hypervisor_type
41 ;;
42 add r8=r8,r9
43 mov b0=r11
44 ;;
45 st8 [r8]=r10
46 br.cond.sptk.many b0
47 ;;
48END(startup_xen)
49
50 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux")
51 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6")
52 ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz "xen-3.0")
53 ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, data8.ua startup_xen - LOAD_OFFSET)
54
55#define isBP p3 // are we the Bootstrap Processor?
56
57 .text
58
59GLOBAL_ENTRY(xen_setup_hook)
60 mov r8=XEN_PV_DOMAIN_ASM
61(isBP) movl r9=xen_domain_type;;
62(isBP) st4 [r9]=r8
63 movl r10=xen_ivt;;
64
65 mov cr.iva=r10
66
67 /* Set xsi base. */
68#define FW_HYPERCALL_SET_SHARED_INFO_VA 0x600
69(isBP) mov r2=FW_HYPERCALL_SET_SHARED_INFO_VA
70(isBP) movl r28=XSI_BASE;;
71(isBP) break 0x1000;;
72
73 /* setup pv_ops */
74(isBP) mov r4=rp
75 ;;
76(isBP) br.call.sptk.many rp=xen_setup_pv_ops
77 ;;
78(isBP) mov rp=r4
79 ;;
80
81 br.ret.sptk.many rp
82 ;;
83END(xen_setup_hook)