1/* SPDX-License-Identifier: GPL-2.0 */ 2/* Xen-specific pieces of head.S, intended to be included in the right 3 place in head.S */ 4 5#ifdef CONFIG_XEN 6 7#include <linux/elfnote.h> 8#include <linux/init.h> 9 10#include <asm/boot.h> 11#include <asm/asm.h> 12#include <asm/msr.h> 13#include <asm/page_types.h> 14#include <asm/percpu.h> 15#include <asm/unwind_hints.h> 16 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> 22 23.pushsection .noinstr.text, "ax" 24 .balign PAGE_SIZE 25SYM_CODE_START(hypercall_page) 26 .rept (PAGE_SIZE / 32) 27 UNWIND_HINT_FUNC 28 ANNOTATE_NOENDBR 29 ret 30 /* 31 * Xen will write the hypercall page, and sort out ENDBR. 32 */ 33 .skip 31, 0xcc 34 .endr 35 36#define HYPERCALL(n) \ 37 .equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \ 38 .type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32 39#include <asm/xen-hypercalls.h> 40#undef HYPERCALL 41SYM_CODE_END(hypercall_page) 42.popsection 43 44#ifdef CONFIG_XEN_PV 45 __INIT 46SYM_CODE_START(startup_xen) 47 UNWIND_HINT_EMPTY 48 cld 49 50 /* Clear .bss */ 51 xor %eax,%eax 52 mov $__bss_start, %rdi 53 mov $__bss_stop, %rcx 54 sub %rdi, %rcx 55 shr $3, %rcx 56 rep stosq 57 58 mov %rsi, xen_start_info 59 mov initial_stack(%rip), %rsp 60 61 /* Set up %gs. 62 * 63 * The base of %gs always points to fixed_percpu_data. If the 64 * stack protector canary is enabled, it is located at %gs:40. 65 * Note that, on SMP, the boot cpu uses init data section until 66 * the per cpu areas are set up. 67 */ 68 movl $MSR_GS_BASE,%ecx 69 movq $INIT_PER_CPU_VAR(fixed_percpu_data),%rax 70 cdq 71 wrmsr 72 73 call xen_start_kernel 74SYM_CODE_END(startup_xen) 75 __FINIT 76 77#ifdef CONFIG_XEN_PV_SMP 78.pushsection .text 79SYM_CODE_START(asm_cpu_bringup_and_idle) 80 UNWIND_HINT_EMPTY 81 ENDBR 82 83 call cpu_bringup_and_idle 84SYM_CODE_END(asm_cpu_bringup_and_idle) 85.popsection 86#endif 87#endif 88 89 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux") 90 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6") 91 ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz "xen-3.0") 92#ifdef CONFIG_X86_32 93 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __PAGE_OFFSET) 94#else 95 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __START_KERNEL_map) 96 /* Map the p2m table to a 512GB-aligned user address. */ 97 ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad (PUD_SIZE * PTRS_PER_PUD)) 98#endif 99#ifdef CONFIG_XEN_PV 100 ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen) 101#endif 102 ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page) 103 ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, 104 .ascii "!writable_page_tables|pae_pgdir_above_4gb") 105 ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES, 106 .long (1 << XENFEAT_writable_page_tables) | \ 107 (1 << XENFEAT_dom0) | \ 108 (1 << XENFEAT_linux_rsdp_unrestricted)) 109 ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes") 110 ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic") 111 ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, 112 .quad _PAGE_PRESENT; .quad _PAGE_PRESENT) 113 ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1) 114 ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN, .long 1) 115 ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, _ASM_PTR __HYPERVISOR_VIRT_START) 116 ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, _ASM_PTR 0) 117 118#endif /*CONFIG_XEN */ 119