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| author | Keir Fraser <keir.fraser@citrix.com> | 2008-06-18 09:36:47 +0100 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2008-06-18 09:36:47 +0100 |
| commit | a2c7db64f561821fd528614e68c4d92718210126 (patch) | |
| tree | 79c7e1c3ef49b5b4272fd12d36420e6fb8d23cd1 /stubdom/grub/boot-x86_32.S | |
| parent | 7074b13cee246f09b3b0a2a6da139b2e047cf4a4 (diff) | |
| download | xen-a2c7db64f561821fd528614e68c4d92718210126.tar.gz xen-a2c7db64f561821fd528614e68c4d92718210126.tar.bz2 xen-a2c7db64f561821fd528614e68c4d92718210126.zip | |
Add PV-GRUB
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>
Diffstat (limited to 'stubdom/grub/boot-x86_32.S')
| -rw-r--r-- | stubdom/grub/boot-x86_32.S | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/stubdom/grub/boot-x86_32.S b/stubdom/grub/boot-x86_32.S new file mode 100644 index 0000000000..c95fd30dd3 --- /dev/null +++ b/stubdom/grub/boot-x86_32.S @@ -0,0 +1,112 @@ +#include <os.h> +#include <arch_limits.h> +#include <xen/arch-x86_32.h> + +/* For simplicity, we keep all of this into just one data page */ +.data +.globl _boot_page +_boot_page: + .align __PAGE_SIZE + +/* + * The following data is initialized from C code + */ + +/* Pte of this page */ +.globl _boot_page_entry +_boot_page_entry: +_boot_page_entry_lo: + .long 0 +_boot_page_entry_hi: + .long 0 + +/* mmuext_op structure */ +/* Set new page directory */ +_boot_mmuext: + /* Op # */ + .long MMUEXT_NEW_BASEPTR + + /* MFN of target page table directory */ +.globl _boot_pdmfn +_boot_pdmfn: + .long 0 + + /* Unused */ + .long 0 + +/* Unpin old page directory */ + /* Op # */ + .long MMUEXT_UNPIN_TABLE + + /* MFN of old page table directory */ +.globl _boot_oldpdmfn +_boot_oldpdmfn: + .long 0 + + /* Unused */ + .long 0 + +/* Target stack address, also target virtual address of this page */ +.globl _boot_stack +_boot_stack: + .long 0 + .long __KERNEL_SS +.globl _boot_target +_boot_target: + .long 0 + +/* Target start info */ +.globl _boot_start_info +_boot_start_info: + .long 0 + +/* Target start address */ +.globl _boot_start +_boot_start: + .long 0 + +/* + * Boot target OS, does not return + */ +.globl _boot +_boot: + /* Project ourselves at the target place. */ + movl _boot_target, %ebx + movl %ebx, %ebp /* also keep it in ebp for relative addressing */ + movl _boot_page_entry_lo, %ecx + movl _boot_page_entry_hi, %edx + movl $2, %esi /* UVMF_INVLPG */ + movl $__HYPERVISOR_update_va_mapping, %eax + int $0x82 + testl %eax, %eax + jz 0f + ud2 + +0: + /* Go there. */ + movl $(0f - _boot_page), %eax + movl _boot_target, %ebx + addl %ebx, %eax + jmpl *%eax +0: + + /* Load target page table and unpin old page table. */ + /* We shouldn't have any problem since in the new page table our page is + mapped at the same place. */ + leal (_boot_mmuext-_boot_page)(%ebp), %ebx + movl $2, %ecx + xorl %edx, %edx + movl $0x7FF0, %esi /* DOMID_SELF */ + movl $__HYPERVISOR_mmuext_op, %eax + int $0x82 + testl %eax, %eax + jns 0f + ud2 + +0: + /* Initialize registers. */ + lss (_boot_stack-_boot_page)(%ebp), %esp + movl (_boot_start_info-_boot_page)(%ebp), %esi + + /* Jump! */ + jmpl *(_boot_start-_boot_page)(%ebp) |