113 lines
3.1 KiB
ArmAsm
113 lines
3.1 KiB
ArmAsm
/* 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 */
|