2 * linux/arch/x86_64/kernel/head.S -- start in 32bit and switch to 64bit
4 * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
5 * Copyright (C) 2000 Pavel Machek <pavel@suse.cz>
6 * Copyright (C) 2000 Karsten Keil <kkeil@suse.de>
7 * Copyright (C) 2001,2002 Andi Kleen <ak@suse.de>
9 * Jun Nakajima <jun.nakajima@intel.com>
14 #include <linux/linkage.h>
15 #include <linux/threads.h>
16 #include <linux/init.h>
17 #include <linux/elfnote.h>
19 #include <asm/segment.h>
22 #include <asm/cache.h>
24 #include <xen/interface/elfnote.h>
27 .section .bootstrap.text
29 #define VIRT_ENTRY_OFFSET 0x0
30 .org VIRT_ENTRY_OFFSET
34 movq $(init_thread_union+THREAD_SIZE-8),%rsp
35 /* zero EFLAGS after setting rsp */
39 /* rsi is pointer to startup info structure.
42 jmp x86_64_start_kernel
48 #define NEXT_PAGE(name) \
50 .org $page * 0x1000; \
51 phys_/**/name = $page * 0x1000 + __PHYSICAL_START; \
54 NEXT_PAGE(init_level4_pgt)
55 /* This gets initialized in x86_64_start_kernel */
59 * We update two pgd entries to make kernel and user pgd consistent
60 * at pgd_populate(). It can be used for kernel modules. So we place
61 * this page here for those cases to avoid memory corruption.
62 * We also use this page to establish the initiali mapping for
65 NEXT_PAGE(init_level4_user_pgt)
68 NEXT_PAGE(level3_kernel_pgt)
72 * This is used for vsyscall area mapping as we have a different
73 * level4 page table for user.
75 NEXT_PAGE(level3_user_pgt)
78 NEXT_PAGE(level2_kernel_pgt)
81 NEXT_PAGE(hypercall_page)
91 .word gdt_end-cpu_gdt_table-1
101 /* We need valid kernel segments for data and code in long mode too
102 * IRET will check the segment types kkeil 2000/10/28
103 * Also sysret mandates a special GDT layout
106 .section .data.page_aligned, "aw"
109 /* The TLS descriptors are currently at a different place compared to i386.
110 Hopefully nobody expects them at a fixed place (Wine?) */
113 .quad 0x0000000000000000 /* NULL descriptor */
114 .quad 0x0 /* unused */
115 .quad 0x00af9a000000ffff /* __KERNEL_CS */
116 .quad 0x00cf92000000ffff /* __KERNEL_DS */
117 .quad 0x00cffa000000ffff /* __USER32_CS */
118 .quad 0x00cff2000000ffff /* __USER_DS, __USER32_DS */
119 .quad 0x00affa000000ffff /* __USER_CS */
120 .quad 0x00cf9a000000ffff /* __KERNEL32_CS */
123 .quad 0,0,0 /* three TLS descriptors */
124 .quad 0x0000f40000000000 /* node/CPU stored in limit */
126 /* asm/segment.h:GDT_ENTRIES must match this */
127 /* This should be a multiple of the cache line size */
128 /* GDTs of other CPUs are now dynamically allocated */
130 /* zero the remaining page */
131 .fill PAGE_SIZE / 8 - GDT_ENTRIES,8,0
133 .section .bss, "aw", @nobits
134 .align L1_CACHE_BYTES
138 .section .bss.page_aligned, "aw", @nobits
140 ENTRY(empty_zero_page)
143 #ifdef CONFIG_XEN_COMPAT_030002
145 * __xen_guest information
148 .if (\value) < 0 || (\value) >= 0x10
149 utoh (((\value)>>4)&0x0fffffffffffffff)
151 .if ((\value) & 0xf) < 10
152 .byte '0' + ((\value) & 0xf)
154 .byte 'A' + ((\value) & 0xf) - 10
159 .ascii "GUEST_OS=linux,GUEST_VER=2.6"
160 .ascii ",XEN_VER=xen-3.0"
161 .ascii ",VIRT_BASE=0x"
162 utoh __START_KERNEL_map
163 .ascii ",ELF_PADDR_OFFSET=0x"
164 utoh __START_KERNEL_map
165 .ascii ",VIRT_ENTRY=0x"
166 utoh (__START_KERNEL_map + __PHYSICAL_START + VIRT_ENTRY_OFFSET)
167 .ascii ",HYPERCALL_PAGE=0x"
168 utoh (phys_hypercall_page >> PAGE_SHIFT)
169 .ascii ",FEATURES=writable_page_tables"
170 .ascii "|writable_descriptor_tables"
171 .ascii "|auto_translated_physmap"
172 .ascii "|supervisor_mode_kernel"
173 .ascii ",LOADER=generic"
175 #endif /* CONFIG_XEN_COMPAT_030002 */
177 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz, "linux")
178 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz, "2.6")
179 ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz, "xen-3.0")
180 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, .quad, __START_KERNEL_map)
181 #ifdef CONFIG_XEN_COMPAT_030002
182 ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, .quad, __START_KERNEL_map)
184 ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, .quad, 0)
185 #endif /* !CONFIG_XEN_COMPAT_030002 */
186 ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, .quad, startup_64)
187 ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, .quad, hypercall_page)
188 ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz, "writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel")
189 ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz, "generic")