131 lines
3.9 KiB
ArmAsm
131 lines
3.9 KiB
ArmAsm
/* Xen-specific pieces of head.S, intended to be included in the right
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place in head.S */
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#ifdef CONFIG_XEN
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#include <linux/elfnote.h>
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#include <linux/init.h>
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#include <asm/boot.h>
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#include <asm/asm.h>
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#include <asm/page_types.h>
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#include <xen/interface/elfnote.h>
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#include <xen/interface/features.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/xen-mca.h>
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#include <asm/xen/interface.h>
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#ifdef CONFIG_XEN_PVH
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#define PVH_FEATURES_STR "|writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel"
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/* Note the lack of 'hvm_callback_vector'. Older hypervisor will
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* balk at this being part of XEN_ELFNOTE_FEATURES, so we put it in
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* XEN_ELFNOTE_SUPPORTED_FEATURES which older hypervisors will ignore.
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*/
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#define PVH_FEATURES ((1 << XENFEAT_writable_page_tables) | \
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(1 << XENFEAT_auto_translated_physmap) | \
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(1 << XENFEAT_supervisor_mode_kernel) | \
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(1 << XENFEAT_hvm_callback_vector))
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/* The XENFEAT_writable_page_tables is not stricly necessary as we set that
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* up regardless whether this CONFIG option is enabled or not, but it
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* clarifies what the right flags need to be.
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*/
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#else
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#define PVH_FEATURES_STR ""
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#define PVH_FEATURES (0)
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#endif
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__INIT
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ENTRY(startup_xen)
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cld
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/* Clear .bss */
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xor %eax,%eax
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mov $__bss_start, %_ASM_DI
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mov $__bss_stop, %_ASM_CX
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sub %_ASM_DI, %_ASM_CX
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shr $__ASM_SEL(2, 3), %_ASM_CX
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rep __ASM_SIZE(stos)
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mov %_ASM_SI, xen_start_info
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mov $init_thread_union+THREAD_SIZE, %_ASM_SP
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jmp xen_start_kernel
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__FINIT
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#ifdef CONFIG_XEN_PVH
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/*
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* xen_pvh_early_cpu_init() - early PVH VCPU initialization
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* @cpu: this cpu number (%rdi)
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* @entry: true if this is a secondary vcpu coming up on this entry
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* point, false if this is the boot CPU being initialized for
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* the first time (%rsi)
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*
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* Note: This is called as a function on the boot CPU, and is the entry point
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* on the secondary CPU.
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*/
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ENTRY(xen_pvh_early_cpu_init)
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mov %rsi, %r11
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/* Gather features to see if NX implemented. */
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mov $0x80000001, %eax
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cpuid
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mov %edx, %esi
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mov $MSR_EFER, %ecx
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rdmsr
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bts $_EFER_SCE, %eax
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bt $20, %esi
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jnc 1f /* No NX, skip setting it */
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bts $_EFER_NX, %eax
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1: wrmsr
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#ifdef CONFIG_SMP
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cmp $0, %r11b
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jne cpu_bringup_and_idle
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#endif
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ret
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#endif /* CONFIG_XEN_PVH */
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.pushsection .text
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.balign PAGE_SIZE
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ENTRY(hypercall_page)
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.skip PAGE_SIZE
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#define HYPERCALL(n) \
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.equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \
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.type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32
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#include <asm/xen-hypercalls.h>
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#undef HYPERCALL
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.popsection
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ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux")
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ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6")
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ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz "xen-3.0")
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#ifdef CONFIG_X86_32
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ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __PAGE_OFFSET)
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#else
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ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __START_KERNEL_map)
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/* Map the p2m table to a 512GB-aligned user address. */
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ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad PGDIR_SIZE)
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#endif
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ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen)
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ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
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ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .ascii "!writable_page_tables|pae_pgdir_above_4gb"; .asciz PVH_FEATURES_STR)
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ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES, .long (PVH_FEATURES) |
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(1 << XENFEAT_writable_page_tables) |
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(1 << XENFEAT_dom0))
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ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes")
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ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic")
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ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
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.quad _PAGE_PRESENT; .quad _PAGE_PRESENT)
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ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1)
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ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN, .long 1)
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ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, _ASM_PTR __HYPERVISOR_VIRT_START)
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ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, _ASM_PTR 0)
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#endif /*CONFIG_XEN */
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