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113 lines
3.1 KiB
113 lines
3.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* 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/msr.h> |
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#include <asm/page_types.h> |
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#include <asm/percpu.h> |
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#include <asm/unwind_hints.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_PV |
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__INIT |
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SYM_CODE_START(startup_xen) |
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UNWIND_HINT_EMPTY |
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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 initial_stack(%rip), %rsp |
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/* Set up %gs. |
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* |
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* The base of %gs always points to fixed_percpu_data. If the |
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* stack protector canary is enabled, it is located at %gs:40. |
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* Note that, on SMP, the boot cpu uses init data section until |
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* the per cpu areas are set up. |
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*/ |
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movl $MSR_GS_BASE,%ecx |
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movq $INIT_PER_CPU_VAR(fixed_percpu_data),%rax |
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cdq |
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wrmsr |
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call xen_start_kernel |
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SYM_CODE_END(startup_xen) |
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__FINIT |
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#ifdef CONFIG_XEN_PV_SMP |
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.pushsection .text |
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SYM_CODE_START(asm_cpu_bringup_and_idle) |
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UNWIND_HINT_EMPTY |
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call cpu_bringup_and_idle |
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SYM_CODE_END(asm_cpu_bringup_and_idle) |
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.popsection |
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#endif |
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#endif |
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.pushsection .text |
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.balign PAGE_SIZE |
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SYM_CODE_START(hypercall_page) |
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.rept (PAGE_SIZE / 32) |
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UNWIND_HINT_FUNC |
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.skip 31, 0x90 |
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ret |
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.endr |
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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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SYM_CODE_END(hypercall_page) |
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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 (PUD_SIZE * PTRS_PER_PUD)) |
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#endif |
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#ifdef CONFIG_XEN_PV |
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ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen) |
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#endif |
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ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page) |
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ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, |
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.ascii "!writable_page_tables|pae_pgdir_above_4gb") |
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ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES, |
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.long (1 << XENFEAT_writable_page_tables) | \ |
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(1 << XENFEAT_dom0) | \ |
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(1 << XENFEAT_linux_rsdp_unrestricted)) |
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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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