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Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001/* 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>
Sam Ravnborg08b6d292008-01-30 13:33:25 +01007#include <linux/init.h>
Jeremy Fitzhardinge7077c332008-07-08 15:06:35 -07008
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07009#include <asm/boot.h>
Jeremy Fitzhardinge7077c332008-07-08 15:06:35 -070010#include <asm/asm.h>
Jeremy Fitzhardinge0341c142009-02-13 11:14:01 -080011#include <asm/page_types.h>
Jeremy Fitzhardinge7077c332008-07-08 15:06:35 -070012
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070013#include <xen/interface/elfnote.h>
Mukesh Rathor4e903a22013-12-31 11:16:25 -050014#include <xen/interface/features.h>
Juergen Gross526abea2015-01-21 08:49:25 +010015#include <xen/interface/xen.h>
16#include <xen/interface/xen-mca.h>
Jeremy Fitzhardinge7e0edc12008-05-31 01:33:04 +010017#include <asm/xen/interface.h>
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070018
Mukesh Rathor4e903a22013-12-31 11:16:25 -050019#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))
Adam Buchbinder6a6256f2016-02-23 15:34:30 -080029/* The XENFEAT_writable_page_tables is not stricly necessary as we set that
Mukesh Rathor4e903a22013-12-31 11:16:25 -050030 * 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
Sam Ravnborg08b6d292008-01-30 13:33:25 +010038 __INIT
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070039ENTRY(startup_xen)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070040 cld
Boris Ostrovsky04b6b4a2016-02-26 14:02:36 -050041
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
Boris Ostrovsky4478c402016-02-26 14:02:37 -050050 mov %_ASM_SI, xen_start_info
51 mov $init_thread_union+THREAD_SIZE, %_ASM_SP
52
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070053 jmp xen_start_kernel
Sam Ravnborg08b6d292008-01-30 13:33:25 +010054
55 __FINIT
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070056
Mukesh Rathora2ef5dc2014-09-10 16:36:06 -070057#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 */
68ENTRY(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
831: 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
Jeremy Fitzhardingea987b162008-06-16 15:01:56 -070092.pushsection .text
Konrad Rzeszutek Wilk7d0642b2012-07-11 15:03:18 -040093 .balign PAGE_SIZE
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070094ENTRY(hypercall_page)
Juergen Gross526abea2015-01-21 08:49:25 +010095 .skip PAGE_SIZE
Konrad Rzeszutek Wilk7d0642b2012-07-11 15:03:18 -040096
Juergen Gross526abea2015-01-21 08:49:25 +010097#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
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700103.popsection
104
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700105 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")
Jeremy Fitzhardinge8c5e5ac2008-07-08 15:06:44 -0700108#ifdef CONFIG_X86_32
Jeremy Fitzhardinge7077c332008-07-08 15:06:35 -0700109 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __PAGE_OFFSET)
Jeremy Fitzhardinge8c5e5ac2008-07-08 15:06:44 -0700110#else
111 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __START_KERNEL_map)
Juergen Gross8f5b0c62015-07-17 06:51:25 +0200112 /* Map the p2m table to a 512GB-aligned user address. */
113 ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad PGDIR_SIZE)
Jeremy Fitzhardinge8c5e5ac2008-07-08 15:06:44 -0700114#endif
Jeremy Fitzhardinge7077c332008-07-08 15:06:35 -0700115 ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen)
116 ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
Mukesh Rathor4e903a22013-12-31 11:16:25 -0500117 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))
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700121 ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes")
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700122 ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic")
Jeremy Fitzhardinge7e0edc12008-05-31 01:33:04 +0100123 ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
124 .quad _PAGE_PRESENT; .quad _PAGE_PRESENT)
125 ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1)
Juergen Grossd1e9abd2014-09-17 06:12:36 +0200126 ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN, .long 1)
Jeremy Fitzhardinge7077c332008-07-08 15:06:35 -0700127 ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, _ASM_PTR __HYPERVISOR_VIRT_START)
Jeremy Fitzhardinge8c5e5ac2008-07-08 15:06:44 -0700128 ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, _ASM_PTR 0)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700129
130#endif /*CONFIG_XEN */