1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Xen-specific pieces of head.S, intended to be included in the right
7 #include <linux/elfnote.h>
8 #include <linux/init.h>
13 #include <asm/page_types.h>
14 #include <asm/percpu.h>
15 #include <asm/unwind_hints.h>
17 #include <xen/interface/elfnote.h>
18 #include <xen/interface/features.h>
19 #include <xen/interface/xen.h>
20 #include <xen/interface/xen-mca.h>
21 #include <asm/xen/interface.h>
25 SYM_CODE_START(startup_xen)
31 mov $__bss_start, %_ASM_DI
32 mov $__bss_stop, %_ASM_CX
33 sub %_ASM_DI, %_ASM_CX
34 shr $__ASM_SEL(2, 3), %_ASM_CX
37 mov %_ASM_SI, xen_start_info
38 mov initial_stack(%rip), %rsp
42 * The base of %gs always points to fixed_percpu_data. If the
43 * stack protector canary is enabled, it is located at %gs:40.
44 * Note that, on SMP, the boot cpu uses init data section until
45 * the per cpu areas are set up.
47 movl $MSR_GS_BASE,%ecx
48 movq $INIT_PER_CPU_VAR(fixed_percpu_data),%rax
53 SYM_CODE_END(startup_xen)
56 #ifdef CONFIG_XEN_PV_SMP
58 SYM_CODE_START(asm_cpu_bringup_and_idle)
61 call cpu_bringup_and_idle
62 SYM_CODE_END(asm_cpu_bringup_and_idle)
69 SYM_CODE_START(hypercall_page)
70 .rept (PAGE_SIZE / 32)
76 #define HYPERCALL(n) \
77 .equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \
78 .type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32
79 #include <asm/xen-hypercalls.h>
81 SYM_CODE_END(hypercall_page)
84 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux")
85 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6")
86 ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz "xen-3.0")
88 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __PAGE_OFFSET)
90 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __START_KERNEL_map)
91 /* Map the p2m table to a 512GB-aligned user address. */
92 ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad (PUD_SIZE * PTRS_PER_PUD))
95 ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen)
97 ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
98 ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,
99 .ascii "!writable_page_tables|pae_pgdir_above_4gb")
100 ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES,
101 .long (1 << XENFEAT_writable_page_tables) | \
102 (1 << XENFEAT_dom0) | \
103 (1 << XENFEAT_linux_rsdp_unrestricted))
104 ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes")
105 ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic")
106 ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
107 .quad _PAGE_PRESENT; .quad _PAGE_PRESENT)
108 ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1)
109 ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN, .long 1)
110 ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, _ASM_PTR __HYPERVISOR_VIRT_START)
111 ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, _ASM_PTR 0)
113 #endif /*CONFIG_XEN */