X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fx86_64%2Fkernel%2Fhead-xen.S;fp=arch%2Fx86_64%2Fkernel%2Fhead-xen.S;h=17ef60775f593e8b56815c9eaf1a881b8484857e;hb=1db395853d4f30d6120458bd279ede1f882a8525;hp=0000000000000000000000000000000000000000;hpb=34a75f0025b9cf803b6a88db032e6ad6950c9313;p=linux-2.6.git

diff --git a/arch/x86_64/kernel/head-xen.S b/arch/x86_64/kernel/head-xen.S
new file mode 100644
index 000000000..17ef60775
--- /dev/null
+++ b/arch/x86_64/kernel/head-xen.S
@@ -0,0 +1,176 @@
+/*
+ *  linux/arch/x86_64/kernel/head.S -- start in 32bit and switch to 64bit
+ *
+ *  Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
+ *  Copyright (C) 2000 Pavel Machek <pavel@suse.cz>
+ *  Copyright (C) 2000 Karsten Keil <kkeil@suse.de>
+ *  Copyright (C) 2001,2002 Andi Kleen <ak@suse.de>
+ *
+ *  $Id: head.S,v 1.49 2002/03/19 17:39:25 ak Exp $
+ *
+ *  Jun Nakajima <jun.nakajima@intel.com>
+ *    Modified for Xen                                
+ */
+
+
+#include <linux/linkage.h>
+#include <linux/threads.h>
+#include <linux/init.h>
+#include <asm/desc.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/msr.h>
+#include <asm/cache.h>
+
+	.text
+	.section .bootstrap.text
+	.code64
+#define VIRT_ENTRY_OFFSET 0x0
+.org VIRT_ENTRY_OFFSET
+	.globl startup_64
+startup_64:
+ENTRY(_start)
+	movq $(init_thread_union+THREAD_SIZE-8),%rsp
+	/* zero EFLAGS after setting rsp */
+	pushq $0
+	popfq
+
+	/* rsi is pointer to startup info structure.
+	   pass it to C */
+	movq %rsi,%rdi
+	jmp x86_64_start_kernel
+
+ENTRY(stext)
+ENTRY(_stext)
+
+	$page = 0
+#define NEXT_PAGE(name) \
+	$page = $page + 1; \
+	.org $page * 0x1000; \
+	phys_/**/name = $page * 0x1000 + __PHYSICAL_START; \
+ENTRY(name)
+
+NEXT_PAGE(init_level4_pgt)
+	/* This gets initialized in x86_64_start_kernel */
+	.fill	512,8,0
+
+        /*
+         * We update two pgd entries to make kernel and user pgd consistent
+         * at pgd_populate(). It can be used for kernel modules. So we place 
+         * this page here for those cases to avoid memory corruption.
+         * We also use this page to establish the initiali mapping for
+         * vsyscall area.
+         */
+NEXT_PAGE(init_level4_user_pgt)
+	.fill	512,8,0
+
+NEXT_PAGE(level3_kernel_pgt)
+	.fill	512,8,0
+
+        /*
+         * This is used for vsyscall area mapping as we have a different
+         * level4 page table for user.
+         */
+NEXT_PAGE(level3_user_pgt)
+        .fill	512,8,0
+
+NEXT_PAGE(level2_kernel_pgt)
+	.fill	512,8,0
+
+NEXT_PAGE(hypercall_page)
+	.fill	512,8,0
+
+#undef NEXT_PAGE
+
+	.data
+
+	.align 16
+	.globl cpu_gdt_descr
+cpu_gdt_descr:
+	.word	gdt_end-cpu_gdt_table-1
+gdt:
+	.quad	cpu_gdt_table
+#ifdef CONFIG_SMP
+	.rept	NR_CPUS-1
+	.word	0
+	.quad	0
+	.endr
+#endif
+
+/* We need valid kernel segments for data and code in long mode too
+ * IRET will check the segment types  kkeil 2000/10/28
+ * Also sysret mandates a special GDT layout 
+ */
+		 		
+	.section .data.page_aligned, "aw"
+	.align PAGE_SIZE
+
+/* The TLS descriptors are currently at a different place compared to i386.
+   Hopefully nobody expects them at a fixed place (Wine?) */
+
+ENTRY(cpu_gdt_table)
+	.quad	0x0000000000000000	/* NULL descriptor */
+	.quad	0x0			/* unused */
+	.quad	0x00af9a000000ffff	/* __KERNEL_CS */
+	.quad	0x00cf92000000ffff	/* __KERNEL_DS */
+	.quad	0x00cffa000000ffff	/* __USER32_CS */
+	.quad	0x00cff2000000ffff	/* __USER_DS, __USER32_DS  */
+	.quad	0x00affa000000ffff	/* __USER_CS */
+	.quad	0x00cf9a000000ffff	/* __KERNEL32_CS */
+	.quad	0,0			/* TSS */
+	.quad	0,0			/* LDT */
+	.quad   0,0,0			/* three TLS descriptors */
+	.quad	0			/* unused */
+gdt_end:
+	/* asm/segment.h:GDT_ENTRIES must match this */
+	/* This should be a multiple of the cache line size */
+	/* GDTs of other CPUs are now dynamically allocated */
+
+	/* zero the remaining page */
+	.fill PAGE_SIZE / 8 - GDT_ENTRIES,8,0
+
+	.section .bss, "aw", @nobits
+	.align L1_CACHE_BYTES
+ENTRY(idt_table)
+	.skip 256 * 16
+
+	.section .bss.page_aligned, "aw", @nobits
+	.align PAGE_SIZE
+ENTRY(empty_zero_page)
+	.skip PAGE_SIZE
+
+/*
+ * __xen_guest information
+ */
+.macro utoh value
+ .if (\value) < 0 || (\value) >= 0x10
+	utoh (((\value)>>4)&0x0fffffffffffffff)
+ .endif
+ .if ((\value) & 0xf) < 10
+  .byte '0' + ((\value) & 0xf)
+ .else
+  .byte 'A' + ((\value) & 0xf) - 10
+ .endif
+.endm
+
+.section __xen_guest
+	.ascii	"GUEST_OS=linux,GUEST_VER=2.6"
+	.ascii	",XEN_VER=xen-3.0"
+	.ascii	",VIRT_BASE=0x"
+		utoh __START_KERNEL_map
+#ifdef CONFIG_XEN_COMPAT_030002
+	.ascii	",ELF_PADDR_OFFSET=0x"
+		utoh __START_KERNEL_map
+#else
+	.ascii	",ELF_PADDR_OFFSET=0x0"
+#endif /* !CONFIG_XEN_COMPAT_030002 */
+	.ascii	",VIRT_ENTRY=0x"
+		utoh (__START_KERNEL_map + __PHYSICAL_START + VIRT_ENTRY_OFFSET)
+	.ascii	",HYPERCALL_PAGE=0x"
+		utoh (phys_hypercall_page >> PAGE_SHIFT)
+	.ascii  ",FEATURES=writable_page_tables"
+	.ascii		 "|writable_descriptor_tables"
+	.ascii		 "|auto_translated_physmap"
+	.ascii	         "|supervisor_mode_kernel"
+	.ascii	",LOADER=generic"
+	.byte	0