mirror of
https://github.com/xen-project/xen.git
synced 2026-10-28 02:01:24 +01:00
Keir Fraser
a2c7db64f5
This fetches GRUB1 sources, applies the {graphical, print function,
save default, and ext3_256byte} patches from debian, and applies a
patch to make it work on x86_64 and port it to Mini-OS. By using
libxc, PV-GRUB can then "kexec" the loaded kernel from inside the
domain itself, hence permitting to avoid the security-concerned
pygrub.
Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
109 lines
2.3 KiB
ArmAsm
109 lines
2.3 KiB
ArmAsm
#include <os.h>
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#include <arch_limits.h>
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#include <xen/arch-x86_64.h>
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/* For simplicity, we keep all of this into just one data page */
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.data
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.globl _boot_page
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_boot_page:
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.align __PAGE_SIZE
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/*
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* The following data is initialized from C code
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*/
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/* Pte of this page */
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.globl _boot_page_entry
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_boot_page_entry:
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.quad 0
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/* mmuext_op structure */
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/* Set new page directory */
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_boot_mmuext:
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/* Op # */
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.long MMUEXT_NEW_BASEPTR
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.long 0 /* pad */
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/* MFN of target page table directory */
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.globl _boot_pdmfn
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_boot_pdmfn:
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.quad 0
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/* Unused */
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.quad 0
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/* Unpin old page directory */
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/* Op # */
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.long MMUEXT_UNPIN_TABLE
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.long 0 /* pad */
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/* MFN of old page table directory */
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.globl _boot_oldpdmfn
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_boot_oldpdmfn:
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.quad 0
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/* Unused */
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.quad 0
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/* Target stack address, also target virtual address of this page */
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.globl _boot_stack
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_boot_stack:
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.quad 0
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.globl _boot_target
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_boot_target:
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.quad 0
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/* Target start info */
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.globl _boot_start_info
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_boot_start_info:
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.quad 0
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/* Target start address */
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.globl _boot_start
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_boot_start:
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.quad 0
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/*
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* Boot target OS, does not return
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*/
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.globl _boot
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_boot:
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/* Project ourselves at the target place. */
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movq _boot_target, %rdi
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movq _boot_page_entry, %rsi
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movq $2, %rdx /* UVMF_INVLPG */
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movq $__HYPERVISOR_update_va_mapping, %rax
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syscall
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testq %rax, %rax
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jz 0f
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ud2
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0:
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/* Go there. */
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movq $(0f - _boot_page), %rax
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movq _boot_target, %rbx
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addq %rbx, %rax
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jmpq *%rax
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0:
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/* Load target page table and unpin old page table. */
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/* We shouldn't have any problem since in the new page table our page is
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mapped at the same place. */
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leaq _boot_mmuext(%rip), %rdi
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movq $2, %rsi
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xorq %rdx, %rdx
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movq $0x7FF0, %r10 /* DOMID_SELF */
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movq $__HYPERVISOR_mmuext_op, %rax
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syscall
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testq %rax, %rax
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jns 0f
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ud2
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0:
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/* Initialize registers. */
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movq _boot_stack(%rip), %rsp
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movq _boot_start_info(%rip), %rsi
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/* Jump! */
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jmpq *_boot_start(%rip)
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