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- /* SPDX-License-Identifier: GPL-2.0 */
- /* Xen-specific pieces of head.S, intended to be included in the right
- place in head.S */
- #ifdef CONFIG_XEN
- #include <linux/elfnote.h>
- #include <linux/init.h>
- #include <asm/boot.h>
- #include <asm/asm.h>
- #include <asm/msr.h>
- #include <asm/page_types.h>
- #include <asm/percpu.h>
- #include <asm/unwind_hints.h>
- #include <xen/interface/elfnote.h>
- #include <xen/interface/features.h>
- #include <xen/interface/xen.h>
- #include <xen/interface/xen-mca.h>
- #include <asm/xen/interface.h>
- .pushsection .noinstr.text, "ax"
- .balign PAGE_SIZE
- SYM_CODE_START(hypercall_page)
- .rept (PAGE_SIZE / 32)
- UNWIND_HINT_FUNC
- ANNOTATE_NOENDBR
- ANNOTATE_UNRET_SAFE
- ret
- /*
- * Xen will write the hypercall page, and sort out ENDBR.
- */
- .skip 31, 0xcc
- .endr
- #define HYPERCALL(n) \
- .equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \
- .type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32
- #include <asm/xen-hypercalls.h>
- #undef HYPERCALL
- SYM_CODE_END(hypercall_page)
- .popsection
- #ifdef CONFIG_XEN_PV
- __INIT
- SYM_CODE_START(startup_xen)
- UNWIND_HINT_EMPTY
- ANNOTATE_NOENDBR
- cld
- mov initial_stack(%rip), %rsp
- /* Set up %gs.
- *
- * The base of %gs always points to fixed_percpu_data. If the
- * stack protector canary is enabled, it is located at %gs:40.
- * Note that, on SMP, the boot cpu uses init data section until
- * the per cpu areas are set up.
- */
- movl $MSR_GS_BASE,%ecx
- movq $INIT_PER_CPU_VAR(fixed_percpu_data),%rax
- cdq
- wrmsr
- mov %rsi, %rdi
- call xen_start_kernel
- SYM_CODE_END(startup_xen)
- __FINIT
- #ifdef CONFIG_XEN_PV_SMP
- .pushsection .text
- SYM_CODE_START(asm_cpu_bringup_and_idle)
- UNWIND_HINT_EMPTY
- ENDBR
- call cpu_bringup_and_idle
- SYM_CODE_END(asm_cpu_bringup_and_idle)
- .popsection
- #endif
- #endif
- ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux")
- ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6")
- ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz "xen-3.0")
- #ifdef CONFIG_X86_32
- ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __PAGE_OFFSET)
- #else
- ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __START_KERNEL_map)
- /* Map the p2m table to a 512GB-aligned user address. */
- ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad (PUD_SIZE * PTRS_PER_PUD))
- #endif
- #ifdef CONFIG_XEN_PV
- ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen)
- #endif
- ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
- ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,
- .ascii "!writable_page_tables|pae_pgdir_above_4gb")
- ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES,
- .long (1 << XENFEAT_writable_page_tables) | \
- (1 << XENFEAT_dom0) | \
- (1 << XENFEAT_linux_rsdp_unrestricted))
- ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes")
- ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic")
- ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
- .quad _PAGE_PRESENT; .quad _PAGE_PRESENT)
- ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1)
- ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN, .long 1)
- ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, _ASM_PTR __HYPERVISOR_VIRT_START)
- ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, _ASM_PTR 0)
- #endif /*CONFIG_XEN */
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