diff options
Diffstat (limited to 'kernel/arch/x86/xen/xen-head.S')
| -rw-r--r-- | kernel/arch/x86/xen/xen-head.S | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/kernel/arch/x86/xen/xen-head.S b/kernel/arch/x86/xen/xen-head.S new file mode 100644 index 000000000..8afdfccf6 --- /dev/null +++ b/kernel/arch/x86/xen/xen-head.S @@ -0,0 +1,123 @@ +/* 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/page_types.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_PVH +#define PVH_FEATURES_STR "|writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel" +/* Note the lack of 'hvm_callback_vector'. Older hypervisor will + * balk at this being part of XEN_ELFNOTE_FEATURES, so we put it in + * XEN_ELFNOTE_SUPPORTED_FEATURES which older hypervisors will ignore. + */ +#define PVH_FEATURES ((1 << XENFEAT_writable_page_tables) | \ + (1 << XENFEAT_auto_translated_physmap) | \ + (1 << XENFEAT_supervisor_mode_kernel) | \ + (1 << XENFEAT_hvm_callback_vector)) +/* The XENFEAT_writable_page_tables is not stricly neccessary as we set that + * up regardless whether this CONFIG option is enabled or not, but it + * clarifies what the right flags need to be. + */ +#else +#define PVH_FEATURES_STR "" +#define PVH_FEATURES (0) +#endif + + __INIT +ENTRY(startup_xen) + cld +#ifdef CONFIG_X86_32 + mov %esi,xen_start_info + mov $init_thread_union+THREAD_SIZE,%esp +#else + mov %rsi,xen_start_info + mov $init_thread_union+THREAD_SIZE,%rsp +#endif + jmp xen_start_kernel + + __FINIT + +#ifdef CONFIG_XEN_PVH +/* + * xen_pvh_early_cpu_init() - early PVH VCPU initialization + * @cpu: this cpu number (%rdi) + * @entry: true if this is a secondary vcpu coming up on this entry + * point, false if this is the boot CPU being initialized for + * the first time (%rsi) + * + * Note: This is called as a function on the boot CPU, and is the entry point + * on the secondary CPU. + */ +ENTRY(xen_pvh_early_cpu_init) + mov %rsi, %r11 + + /* Gather features to see if NX implemented. */ + mov $0x80000001, %eax + cpuid + mov %edx, %esi + + mov $MSR_EFER, %ecx + rdmsr + bts $_EFER_SCE, %eax + + bt $20, %esi + jnc 1f /* No NX, skip setting it */ + bts $_EFER_NX, %eax +1: wrmsr +#ifdef CONFIG_SMP + cmp $0, %r11b + jne cpu_bringup_and_idle +#endif + ret + +#endif /* CONFIG_XEN_PVH */ + +.pushsection .text + .balign PAGE_SIZE +ENTRY(hypercall_page) + .skip PAGE_SIZE + +#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 + +.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) +#endif + ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen) + ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page) + ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .ascii "!writable_page_tables|pae_pgdir_above_4gb"; .asciz PVH_FEATURES_STR) + ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES, .long (PVH_FEATURES) | + (1 << XENFEAT_writable_page_tables) | + (1 << XENFEAT_dom0)) + 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 */ |