Mailing List Archive

ChangeSet 1.1449, 2005/05/18 16:11:20+01:00, kaf24@firebug.cl.cam.ac.uk

Fix x86/64 bootstrap.
Signed-off-by: Keir Fraser <keir@xensource.com>



x86_64.S | 45 ++++++++++++++++++++++++---------------------
1 files changed, 24 insertions(+), 21 deletions(-)


diff -Nru a/xen/arch/x86/boot/x86_64.S b/xen/arch/x86/boot/x86_64.S
--- a/xen/arch/x86/boot/x86_64.S 2005-05-18 12:05:07 -04:00
+++ b/xen/arch/x86/boot/x86_64.S 2005-05-18 12:05:07 -04:00
@@ -46,13 +46,13 @@
mov $7,%al
stosb # Write an attribute to the VGA framebuffer
jmp 1b
-
+
__start:
cld
cli

/* Set up a few descriptors: on entry only CS is guaranteed good. */
- lgdt %cs:0x100400
+ lgdt %cs:0x100306 # nopaging_gdt_descr
mov $(__HYPERVISOR_DS32),%ecx
mov %ecx,%ds
mov %ecx,%es
@@ -65,7 +65,7 @@
jne not_multiboot

/* Save the Multiboot info structure for later use. */
- mov %ebx,0x100300
+ mov %ebx,0x100300 # multiboot_ptr

/* We begin by interrogating the CPU for the presence of long mode. */
mov $0x80000000,%eax
@@ -87,7 +87,7 @@
mov %ecx,%cr4

/* Load pagetable base register. */
- mov $0x101000,%eax /* idle_pg_table */
+ mov $0x102000,%eax /* idle_pg_table */
mov %eax,%cr3

/* Set up EFER (Extended Feature Enable Register). */
@@ -168,9 +168,8 @@
loop 1b

/* Pass off the Multiboot info structure to C land. */
- mov 0x100300,%edi
- lea start(%rip),%rax
- sub $0x100000,%rax
+ mov multiboot_ptr(%rip),%edi
+ lea start-0x100000(%rip),%rax
add %rax,%rdi
call __start_xen
ud2 /* Force a panic (invalid opcode). */
@@ -184,26 +183,30 @@
call printf
1: jmp 1b

- .code32

- .org 0x300
-
/*** DESCRIPTOR TABLES ***/

.globl idt
-.globl gdt
+.globl gdt
+
+ .org 0x300
+ .code32
+
+multiboot_ptr: /* 0x300 */
+ .long 0

- .org 0x400
- .word LAST_RESERVED_GDT_BYTE
- .long 0x101000 - FIRST_RESERVED_GDT_BYTE
-
.word 0
+nopaging_gdt_descr: /* 0x306 */
+ .word LAST_RESERVED_GDT_BYTE
+ .quad gdt_table - FIRST_RESERVED_GDT_BYTE - __PAGE_OFFSET
+
+ .word 0,0,0
gdt_descr:
.word LAST_RESERVED_GDT_BYTE
-gdt:
+gdt:
.quad gdt_table - FIRST_RESERVED_GDT_BYTE

- .word 0
+ .word 0,0,0
idt_descr:
.word 256*16-1
idt:
@@ -214,7 +217,7 @@

high_start:
.quad __high_start
-
+
.org 0x1000
ENTRY(gdt_table)
.quad 0x0000000000000000 /* unused */
@@ -231,14 +234,14 @@
.org 0x2000
ENTRY(idle_pg_table)
ENTRY(idle_pg_table_4)
- .quad 0x0000000000102007 # PML4[0]
+ .quad idle_pg_table_l3 - __PAGE_OFFSET + 7 # PML4[0]
.fill 261,8,0
- .quad 0x0000000000102007 # PML4[262]
+ .quad idle_pg_table_l3 - __PAGE_OFFSET + 7 # PML4[262]

/* Initial PDP -- level-3 page table */
.org 0x3000
ENTRY(idle_pg_table_l3)
- .quad 0x0000000000103007
+ .quad idle_pg_table_l2 - __PAGE_OFFSET + 7

/* Initial PDE -- level-2 page table. */
.org 0x4000

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