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/page_types.h> 13#include <asm/unwind_hints.h> 14 15#include <xen/interface/elfnote.h> 16#include <xen/interface/features.h> 17#include <xen/interface/xen.h> 18#include <xen/interface/xen-mca.h> 19#include <asm/xen/interface.h> 20 21#ifdef CONFIG_XEN_PV 22 __INIT 23ENTRY(startup_xen) 24 UNWIND_HINT_EMPTY 25 cld 26 27 /* Clear .bss */ 28 xor %eax,%eax 29 mov $__bss_start, %_ASM_DI 30 mov $__bss_stop, %_ASM_CX 31 sub %_ASM_DI, %_ASM_CX 32 shr $__ASM_SEL(2, 3), %_ASM_CX 33 rep __ASM_SIZE(stos) 34 35 mov %_ASM_SI, xen_start_info 36 mov $init_thread_union+THREAD_SIZE, %_ASM_SP 37 38 jmp xen_start_kernel 39END(startup_xen) 40 __FINIT 41#endif 42 43.pushsection .text 44 .balign PAGE_SIZE 45ENTRY(hypercall_page) 46 .rept (PAGE_SIZE / 32) 47 UNWIND_HINT_EMPTY 48 .skip 32 49 .endr 50 51#define HYPERCALL(n) \ 52 .equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \ 53 .type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32 54#include <asm/xen-hypercalls.h> 55#undef HYPERCALL 56END(hypercall_page) 57.popsection 58 59 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux") 60 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6") 61 ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz "xen-3.0") 62#ifdef CONFIG_X86_32 63 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __PAGE_OFFSET) 64#else 65 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __START_KERNEL_map) 66 /* Map the p2m table to a 512GB-aligned user address. */ 67 ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad (PUD_SIZE * PTRS_PER_PUD)) 68#endif 69#ifdef CONFIG_XEN_PV 70 ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen) 71#endif 72 ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page) 73 ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, 74 .ascii "!writable_page_tables|pae_pgdir_above_4gb") 75 ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES, 76 .long (1 << XENFEAT_writable_page_tables) | (1 << XENFEAT_dom0)) 77 ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes") 78 ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic") 79 ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, 80 .quad _PAGE_PRESENT; .quad _PAGE_PRESENT) 81 ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1) 82 ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN, .long 1) 83 ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, _ASM_PTR __HYPERVISOR_VIRT_START) 84 ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, _ASM_PTR 0) 85 86#endif /*CONFIG_XEN */ 87