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 ANNOTATE_NOENDBR 49 cld 50 51 /* Clear .bss */ 52 xor %eax,%eax 53 mov $__bss_start, %rdi 54 mov $__bss_stop, %rcx 55 sub %rdi, %rcx 56 shr $3, %rcx 57 rep stosq 58 59 mov %rsi, xen_start_info 60 mov initial_stack(%rip), %rsp 61 62 /* Set up %gs. 63 * 64 * The base of %gs always points to fixed_percpu_data. If the 65 * stack protector canary is enabled, it is located at %gs:40. 66 * Note that, on SMP, the boot cpu uses init data section until 67 * the per cpu areas are set up. 68 */ 69 movl $MSR_GS_BASE,%ecx 70 movq $INIT_PER_CPU_VAR(fixed_percpu_data),%rax 71 cdq 72 wrmsr 73 74 call xen_start_kernel 75SYM_CODE_END(startup_xen) 76 __FINIT 77 78#ifdef CONFIG_XEN_PV_SMP 79.pushsection .text 80SYM_CODE_START(asm_cpu_bringup_and_idle) 81 UNWIND_HINT_EMPTY 82 ENDBR 83 84 call cpu_bringup_and_idle 85SYM_CODE_END(asm_cpu_bringup_and_idle) 86.popsection 87#endif 88#endif 89 90 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux") 91 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6") 92 ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz "xen-3.0") 93#ifdef CONFIG_X86_32 94 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __PAGE_OFFSET) 95#else 96 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __START_KERNEL_map) 97 /* Map the p2m table to a 512GB-aligned user address. */ 98 ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad (PUD_SIZE * PTRS_PER_PUD)) 99#endif 100#ifdef CONFIG_XEN_PV 101 ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen) 102#endif 103 ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page) 104 ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, 105 .ascii "!writable_page_tables|pae_pgdir_above_4gb") 106 ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES, 107 .long (1 << XENFEAT_writable_page_tables) | \ 108 (1 << XENFEAT_dom0) | \ 109 (1 << XENFEAT_linux_rsdp_unrestricted)) 110 ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes") 111 ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic") 112 ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, 113 .quad _PAGE_PRESENT; .quad _PAGE_PRESENT) 114 ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1) 115 ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN, .long 1) 116 ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, _ASM_PTR __HYPERVISOR_VIRT_START) 117 ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, _ASM_PTR 0) 118 119#endif /*CONFIG_XEN */ 120