Commit | Line | Data |
---|---|---|
5ead97c8 JF |
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> | |
08b6d290 | 7 | #include <linux/init.h> |
7077c33d | 8 | |
5ead97c8 | 9 | #include <asm/boot.h> |
7077c33d | 10 | #include <asm/asm.h> |
0341c14d | 11 | #include <asm/page_types.h> |
7077c33d | 12 | |
5ead97c8 | 13 | #include <xen/interface/elfnote.h> |
4e903a20 | 14 | #include <xen/interface/features.h> |
526abeae JG |
15 | #include <xen/interface/xen.h> |
16 | #include <xen/interface/xen-mca.h> | |
7e0edc1b | 17 | #include <asm/xen/interface.h> |
5ead97c8 | 18 | |
4e903a20 MR |
19 | #ifdef CONFIG_XEN_PVH |
20 | #define PVH_FEATURES_STR "|writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel" | |
21 | /* Note the lack of 'hvm_callback_vector'. Older hypervisor will | |
22 | * balk at this being part of XEN_ELFNOTE_FEATURES, so we put it in | |
23 | * XEN_ELFNOTE_SUPPORTED_FEATURES which older hypervisors will ignore. | |
24 | */ | |
25 | #define PVH_FEATURES ((1 << XENFEAT_writable_page_tables) | \ | |
26 | (1 << XENFEAT_auto_translated_physmap) | \ | |
27 | (1 << XENFEAT_supervisor_mode_kernel) | \ | |
28 | (1 << XENFEAT_hvm_callback_vector)) | |
6a6256f9 | 29 | /* The XENFEAT_writable_page_tables is not stricly necessary as we set that |
4e903a20 MR |
30 | * up regardless whether this CONFIG option is enabled or not, but it |
31 | * clarifies what the right flags need to be. | |
32 | */ | |
33 | #else | |
34 | #define PVH_FEATURES_STR "" | |
35 | #define PVH_FEATURES (0) | |
36 | #endif | |
37 | ||
08b6d290 | 38 | __INIT |
5ead97c8 | 39 | ENTRY(startup_xen) |
5ead97c8 | 40 | cld |
04b6b4a5 BO |
41 | |
42 | /* Clear .bss */ | |
43 | xor %eax,%eax | |
44 | mov $__bss_start, %_ASM_DI | |
45 | mov $__bss_stop, %_ASM_CX | |
46 | sub %_ASM_DI, %_ASM_CX | |
47 | shr $__ASM_SEL(2, 3), %_ASM_CX | |
48 | rep __ASM_SIZE(stos) | |
49 | ||
4478c407 BO |
50 | mov %_ASM_SI, xen_start_info |
51 | mov $init_thread_union+THREAD_SIZE, %_ASM_SP | |
52 | ||
5ead97c8 | 53 | jmp xen_start_kernel |
08b6d290 SR |
54 | |
55 | __FINIT | |
5ead97c8 | 56 | |
a2ef5dc2 MR |
57 | #ifdef CONFIG_XEN_PVH |
58 | /* | |
59 | * xen_pvh_early_cpu_init() - early PVH VCPU initialization | |
60 | * @cpu: this cpu number (%rdi) | |
61 | * @entry: true if this is a secondary vcpu coming up on this entry | |
62 | * point, false if this is the boot CPU being initialized for | |
63 | * the first time (%rsi) | |
64 | * | |
65 | * Note: This is called as a function on the boot CPU, and is the entry point | |
66 | * on the secondary CPU. | |
67 | */ | |
68 | ENTRY(xen_pvh_early_cpu_init) | |
69 | mov %rsi, %r11 | |
70 | ||
71 | /* Gather features to see if NX implemented. */ | |
72 | mov $0x80000001, %eax | |
73 | cpuid | |
74 | mov %edx, %esi | |
75 | ||
76 | mov $MSR_EFER, %ecx | |
77 | rdmsr | |
78 | bts $_EFER_SCE, %eax | |
79 | ||
80 | bt $20, %esi | |
81 | jnc 1f /* No NX, skip setting it */ | |
82 | bts $_EFER_NX, %eax | |
83 | 1: wrmsr | |
84 | #ifdef CONFIG_SMP | |
85 | cmp $0, %r11b | |
86 | jne cpu_bringup_and_idle | |
87 | #endif | |
88 | ret | |
89 | ||
90 | #endif /* CONFIG_XEN_PVH */ | |
91 | ||
a987b16c | 92 | .pushsection .text |
7d0642b9 | 93 | .balign PAGE_SIZE |
5ead97c8 | 94 | ENTRY(hypercall_page) |
526abeae JG |
95 | .skip PAGE_SIZE |
96 | ||
97 | #define HYPERCALL(n) \ | |
98 | .equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \ | |
99 | .type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32 | |
100 | #include <asm/xen-hypercalls.h> | |
101 | #undef HYPERCALL | |
102 | ||
5ead97c8 JF |
103 | .popsection |
104 | ||
105 | ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux") | |
106 | ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6") | |
107 | ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz "xen-3.0") | |
8c5e5ac3 | 108 | #ifdef CONFIG_X86_32 |
7077c33d | 109 | ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __PAGE_OFFSET) |
8c5e5ac3 JF |
110 | #else |
111 | ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __START_KERNEL_map) | |
8f5b0c63 JG |
112 | /* Map the p2m table to a 512GB-aligned user address. */ |
113 | ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad PGDIR_SIZE) | |
8c5e5ac3 | 114 | #endif |
7077c33d JF |
115 | ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen) |
116 | ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page) | |
4e903a20 MR |
117 | ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .ascii "!writable_page_tables|pae_pgdir_above_4gb"; .asciz PVH_FEATURES_STR) |
118 | ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES, .long (PVH_FEATURES) | | |
119 | (1 << XENFEAT_writable_page_tables) | | |
120 | (1 << XENFEAT_dom0)) | |
5ead97c8 | 121 | ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes") |
5ead97c8 | 122 | ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic") |
7e0edc1b JF |
123 | ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, |
124 | .quad _PAGE_PRESENT; .quad _PAGE_PRESENT) | |
125 | ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1) | |
d1e9abd6 | 126 | ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN, .long 1) |
7077c33d | 127 | ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, _ASM_PTR __HYPERVISOR_VIRT_START) |
8c5e5ac3 | 128 | ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, _ASM_PTR 0) |
5ead97c8 JF |
129 | |
130 | #endif /*CONFIG_XEN */ |