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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | /* 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> #ifdef CONFIG_XEN_PV __INIT SYM_CODE_START(startup_xen) UNWIND_HINT_EMPTY cld /* Clear .bss */ xor %eax,%eax mov $__bss_start, %_ASM_DI mov $__bss_stop, %_ASM_CX sub %_ASM_DI, %_ASM_CX shr $__ASM_SEL(2, 3), %_ASM_CX rep __ASM_SIZE(stos) mov %_ASM_SI, xen_start_info 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 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 call cpu_bringup_and_idle SYM_CODE_END(asm_cpu_bringup_and_idle) .popsection #endif #endif .pushsection .text .balign PAGE_SIZE SYM_CODE_START(hypercall_page) .rept (PAGE_SIZE / 32) UNWIND_HINT_FUNC ANNOTATE_UNRET_SAFE ret .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 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 */ |