mirror of https://gitee.com/openkylin/linux.git
126 lines
3.8 KiB
ArmAsm
126 lines
3.8 KiB
ArmAsm
/* 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)
|
|
/* Map the p2m table to a 512GB-aligned user address. */
|
|
ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad PGDIR_SIZE)
|
|
#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 */
|