37794e42b67dcfc3e5afb25d53cfa0afb2fcbf77
[muen/linux.git] / arch / x86 / xen / xen-head.S
1 /* Xen-specific pieces of head.S, intended to be included in the right
2         place in head.S */
3
4 #ifdef CONFIG_XEN
5
6 #include <linux/elfnote.h>
7 #include <linux/init.h>
8
9 #include <asm/boot.h>
10 #include <asm/asm.h>
11 #include <asm/page_types.h>
12
13 #include <xen/interface/elfnote.h>
14 #include <xen/interface/features.h>
15 #include <xen/interface/xen.h>
16 #include <xen/interface/xen-mca.h>
17 #include <asm/xen/interface.h>
18
19         __INIT
20 ENTRY(startup_xen)
21         cld
22
23         /* Clear .bss */
24         xor %eax,%eax
25         mov $__bss_start, %_ASM_DI
26         mov $__bss_stop, %_ASM_CX
27         sub %_ASM_DI, %_ASM_CX
28         shr $__ASM_SEL(2, 3), %_ASM_CX
29         rep __ASM_SIZE(stos)
30
31         mov %_ASM_SI, xen_start_info
32         mov $init_thread_union+THREAD_SIZE, %_ASM_SP
33
34         jmp xen_start_kernel
35
36         __FINIT
37
38 .pushsection .text
39         .balign PAGE_SIZE
40 ENTRY(hypercall_page)
41         .skip PAGE_SIZE
42
43 #define HYPERCALL(n) \
44         .equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \
45         .type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32
46 #include <asm/xen-hypercalls.h>
47 #undef HYPERCALL
48
49 .popsection
50
51         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS,       .asciz "linux")
52         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION,  .asciz "2.6")
53         ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION,    .asciz "xen-3.0")
54 #ifdef CONFIG_X86_32
55         ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE,      _ASM_PTR __PAGE_OFFSET)
56 #else
57         ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE,      _ASM_PTR __START_KERNEL_map)
58         /* Map the p2m table to a 512GB-aligned user address. */
59         ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M,       .quad PGDIR_SIZE)
60 #endif
61         ELFNOTE(Xen, XEN_ELFNOTE_ENTRY,          _ASM_PTR startup_xen)
62         ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
63         ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,
64                 .ascii "!writable_page_tables|pae_pgdir_above_4gb")
65         ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES,
66                 .long (1 << XENFEAT_writable_page_tables) | (1 << XENFEAT_dom0))
67         ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE,       .asciz "yes")
68         ELFNOTE(Xen, XEN_ELFNOTE_LOADER,         .asciz "generic")
69         ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
70                 .quad _PAGE_PRESENT; .quad _PAGE_PRESENT)
71         ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1)
72         ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN,  .long 1)
73         ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW,   _ASM_PTR __HYPERVISOR_VIRT_START)
74         ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET,   _ASM_PTR 0)
75
76 #endif /*CONFIG_XEN */