1/* Xen-specific pieces of head.S, intended to be included in the right 2 place in head.S */ 3 4#ifdef CONFIG_XEN 5 6#include <linux/elfnote.h> 7#include <linux/init.h> 8 9#include <asm/boot.h> 10#include <asm/asm.h> 11#include <asm/page_types.h> 12 13#include <xen/interface/elfnote.h> 14#include <xen/interface/features.h> 15#include <xen/interface/xen.h> 16#include <xen/interface/xen-mca.h> 17#include <asm/xen/interface.h> 18 19#ifdef CONFIG_XEN_PVH 20#define PVH_FEATURES_STR "|writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel" 21/* Note the lack of 'hvm_callback_vector'. Older hypervisor will 22 * balk at this being part of XEN_ELFNOTE_FEATURES, so we put it in 23 * XEN_ELFNOTE_SUPPORTED_FEATURES which older hypervisors will ignore. 24 */ 25#define PVH_FEATURES ((1 << XENFEAT_writable_page_tables) | \ 26 (1 << XENFEAT_auto_translated_physmap) | \ 27 (1 << XENFEAT_supervisor_mode_kernel) | \ 28 (1 << XENFEAT_hvm_callback_vector)) 29/* The XENFEAT_writable_page_tables is not stricly necessary as we set that 30 * up regardless whether this CONFIG option is enabled or not, but it 31 * clarifies what the right flags need to be. 32 */ 33#else 34#define PVH_FEATURES_STR "" 35#define PVH_FEATURES (0) 36#endif 37 38 __INIT 39ENTRY(startup_xen) 40 cld 41 42 /* Clear .bss */ 43 xor %eax,%eax 44 mov $__bss_start, %_ASM_DI 45 mov $__bss_stop, %_ASM_CX 46 sub %_ASM_DI, %_ASM_CX 47 shr $__ASM_SEL(2, 3), %_ASM_CX 48 rep __ASM_SIZE(stos) 49 50 mov %_ASM_SI, xen_start_info 51 mov $init_thread_union+THREAD_SIZE, %_ASM_SP 52 53 jmp xen_start_kernel 54 55 __FINIT 56 57#ifdef CONFIG_XEN_PVH 58/* 59 * xen_pvh_early_cpu_init() - early PVH VCPU initialization 60 * @cpu: this cpu number (%rdi) 61 * @entry: true if this is a secondary vcpu coming up on this entry 62 * point, false if this is the boot CPU being initialized for 63 * the first time (%rsi) 64 * 65 * Note: This is called as a function on the boot CPU, and is the entry point 66 * on the secondary CPU. 67 */ 68ENTRY(xen_pvh_early_cpu_init) 69 mov %rsi, %r11 70 71 /* Gather features to see if NX implemented. */ 72 mov $0x80000001, %eax 73 cpuid 74 mov %edx, %esi 75 76 mov $MSR_EFER, %ecx 77 rdmsr 78 bts $_EFER_SCE, %eax 79 80 bt $20, %esi 81 jnc 1f /* No NX, skip setting it */ 82 bts $_EFER_NX, %eax 831: wrmsr 84#ifdef CONFIG_SMP 85 cmp $0, %r11b 86 jne cpu_bringup_and_idle 87#endif 88 ret 89 90#endif /* CONFIG_XEN_PVH */ 91 92.pushsection .text 93 .balign PAGE_SIZE 94ENTRY(hypercall_page) 95 .skip PAGE_SIZE 96 97#define HYPERCALL(n) \ 98 .equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \ 99 .type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32 100#include <asm/xen-hypercalls.h> 101#undef HYPERCALL 102 103.popsection 104 105 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux") 106 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6") 107 ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz "xen-3.0") 108#ifdef CONFIG_X86_32 109 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __PAGE_OFFSET) 110#else 111 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __START_KERNEL_map) 112 /* Map the p2m table to a 512GB-aligned user address. */ 113 ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad PGDIR_SIZE) 114#endif 115 ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen) 116 ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page) 117 ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .ascii "!writable_page_tables|pae_pgdir_above_4gb"; .asciz PVH_FEATURES_STR) 118 ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES, .long (PVH_FEATURES) | 119 (1 << XENFEAT_writable_page_tables) | 120 (1 << XENFEAT_dom0)) 121 ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes") 122 ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic") 123 ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, 124 .quad _PAGE_PRESENT; .quad _PAGE_PRESENT) 125 ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1) 126 ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN, .long 1) 127 ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, _ASM_PTR __HYPERVISOR_VIRT_START) 128 ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, _ASM_PTR 0) 129 130#endif /*CONFIG_XEN */ 131