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annotate stubdom/grub/boot-x86_32.S @ 22848:6341fe0f4e5a

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Added tag 4.1.0-rc2 for changeset 9dca60d88c63
author Keir Fraser <keir@xen.org>
date Tue Jan 25 14:06:55 2011 +0000 (2011-01-25)
parents c8d9ade45781
children
rev   line source
keir@17909 1 #include <os.h>
keir@17909 2 #include <arch_limits.h>
keir@17909 3 #include <xen/arch-x86_32.h>
keir@17909 4
keir@17909 5 /* For simplicity, we keep all of this into just one data page */
keir@17909 6 .data
keir@17909 7 .globl _boot_page
keir@17909 8 _boot_page:
keir@17909 9 .align __PAGE_SIZE
keir@17909 10
keir@17909 11 /*
keir@17909 12 * The following data is initialized from C code
keir@17909 13 */
keir@17909 14
keir@17909 15 /* Pte of this page */
keir@17909 16 .globl _boot_page_entry
keir@17909 17 _boot_page_entry:
keir@17909 18 _boot_page_entry_lo:
keir@17909 19 .long 0
keir@17909 20 _boot_page_entry_hi:
keir@17909 21 .long 0
keir@17909 22
keir@17909 23 /* mmuext_op structure */
keir@17909 24 /* Set new page directory */
keir@17909 25 _boot_mmuext:
keir@17909 26 /* Op # */
keir@17909 27 .long MMUEXT_NEW_BASEPTR
keir@17909 28
keir@17909 29 /* MFN of target page table directory */
keir@17909 30 .globl _boot_pdmfn
keir@17909 31 _boot_pdmfn:
keir@17909 32 .long 0
keir@17909 33
keir@17909 34 /* Unused */
keir@17909 35 .long 0
keir@17909 36
keir@17909 37 /* Unpin old page directory */
keir@17909 38 /* Op # */
keir@17909 39 .long MMUEXT_UNPIN_TABLE
keir@17909 40
keir@17909 41 /* MFN of old page table directory */
keir@17909 42 .globl _boot_oldpdmfn
keir@17909 43 _boot_oldpdmfn:
keir@17909 44 .long 0
keir@17909 45
keir@17909 46 /* Unused */
keir@17909 47 .long 0
keir@17909 48
keir@17909 49 /* Target stack address, also target virtual address of this page */
keir@17909 50 .globl _boot_stack
keir@17909 51 _boot_stack:
keir@17909 52 .long 0
keir@17909 53 .long __KERNEL_SS
keir@17909 54 .globl _boot_target
keir@17909 55 _boot_target:
keir@17909 56 .long 0
keir@17909 57
keir@17909 58 /* Target start info */
keir@17909 59 .globl _boot_start_info
keir@17909 60 _boot_start_info:
keir@17909 61 .long 0
keir@17909 62
keir@17909 63 /* Target start address */
keir@17909 64 .globl _boot_start
keir@17909 65 _boot_start:
keir@17909 66 .long 0
keir@17909 67
keir@17909 68 /*
keir@17909 69 * Boot target OS, does not return
keir@17909 70 */
keir@17909 71 .globl _boot
keir@17909 72 _boot:
keir@17909 73 /* Project ourselves at the target place. */
keir@17909 74 movl _boot_target, %ebx
keir@17909 75 movl %ebx, %ebp /* also keep it in ebp for relative addressing */
keir@17909 76 movl _boot_page_entry_lo, %ecx
keir@17909 77 movl _boot_page_entry_hi, %edx
keir@17909 78 movl $2, %esi /* UVMF_INVLPG */
keir@17909 79 movl $__HYPERVISOR_update_va_mapping, %eax
keir@17909 80 int $0x82
keir@17909 81 testl %eax, %eax
keir@17909 82 jz 0f
keir@17909 83 ud2
keir@17909 84
keir@17909 85 0:
keir@17909 86 /* Go there. */
keir@17909 87 movl $(0f - _boot_page), %eax
keir@17909 88 movl _boot_target, %ebx
keir@17909 89 addl %ebx, %eax
keir@17909 90 jmpl *%eax
keir@17909 91 0:
keir@17909 92
keir@17909 93 /* Load target page table and unpin old page table. */
keir@17909 94 /* We shouldn't have any problem since in the new page table our page is
keir@17909 95 mapped at the same place. */
keir@17909 96 leal (_boot_mmuext-_boot_page)(%ebp), %ebx
keir@17909 97 movl $2, %ecx
keir@17909 98 xorl %edx, %edx
keir@17909 99 movl $0x7FF0, %esi /* DOMID_SELF */
keir@17909 100 movl $__HYPERVISOR_mmuext_op, %eax
keir@17909 101 int $0x82
keir@17909 102 testl %eax, %eax
keir@17909 103 jns 0f
keir@17909 104 ud2
keir@17909 105
keir@17909 106 0:
keir@17909 107 /* Initialize registers. */
keir@17909 108 lss (_boot_stack-_boot_page)(%ebp), %esp
keir@17909 109 movl (_boot_start_info-_boot_page)(%ebp), %esi
keir@17909 110
keir@17909 111 /* Jump! */
keir@17909 112 jmpl *(_boot_start-_boot_page)(%ebp)