| /* 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_EMPTY |
| .skip 32 |
| .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 */ |
