X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fi386%2Fkernel%2Fhead-xen.S;fp=arch%2Fi386%2Fkernel%2Fhead-xen.S;h=25ce03247b21fbdb8169d68bb9c0ba2976cfc594;hb=1db395853d4f30d6120458bd279ede1f882a8525;hp=0000000000000000000000000000000000000000;hpb=34a75f0025b9cf803b6a88db032e6ad6950c9313;p=linux-2.6.git

diff --git a/arch/i386/kernel/head-xen.S b/arch/i386/kernel/head-xen.S
new file mode 100644
index 000000000..25ce03247
--- /dev/null
+++ b/arch/i386/kernel/head-xen.S
@@ -0,0 +1,181 @@
+
+
+.text
+#include <linux/config.h>
+#include <linux/threads.h>
+#include <linux/linkage.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/thread_info.h>
+#include <asm/asm-offsets.h>
+#include <xen/interface/arch-x86_32.h>
+
+/*
+ * References to members of the new_cpu_data structure.
+ */
+
+#define X86		new_cpu_data+CPUINFO_x86
+#define X86_VENDOR	new_cpu_data+CPUINFO_x86_vendor
+#define X86_MODEL	new_cpu_data+CPUINFO_x86_model
+#define X86_MASK	new_cpu_data+CPUINFO_x86_mask
+#define X86_HARD_MATH	new_cpu_data+CPUINFO_hard_math
+#define X86_CPUID	new_cpu_data+CPUINFO_cpuid_level
+#define X86_CAPABILITY	new_cpu_data+CPUINFO_x86_capability
+#define X86_VENDOR_ID	new_cpu_data+CPUINFO_x86_vendor_id
+
+#define VIRT_ENTRY_OFFSET 0x0
+.org VIRT_ENTRY_OFFSET
+ENTRY(startup_32)
+	movl %esi,xen_start_info
+	cld
+
+	/* Set up the stack pointer */
+	movl $(init_thread_union+THREAD_SIZE),%esp
+
+	/* get vendor info */
+	xorl %eax,%eax			# call CPUID with 0 -> return vendor ID
+	XEN_CPUID
+	movl %eax,X86_CPUID		# save CPUID level
+	movl %ebx,X86_VENDOR_ID		# lo 4 chars
+	movl %edx,X86_VENDOR_ID+4	# next 4 chars
+	movl %ecx,X86_VENDOR_ID+8	# last 4 chars
+
+	movl $1,%eax		# Use the CPUID instruction to get CPU type
+	XEN_CPUID
+	movb %al,%cl		# save reg for future use
+	andb $0x0f,%ah		# mask processor family
+	movb %ah,X86
+	andb $0xf0,%al		# mask model
+	shrb $4,%al
+	movb %al,X86_MODEL
+	andb $0x0f,%cl		# mask mask revision
+	movb %cl,X86_MASK
+	movl %edx,X86_CAPABILITY
+
+	movb $1,X86_HARD_MATH
+
+	xorl %eax,%eax			# Clear FS/GS and LDT
+	movl %eax,%fs
+	movl %eax,%gs
+	cld			# gcc2 wants the direction flag cleared at all times
+
+	call start_kernel
+L6:
+	jmp L6			# main should never return here, but
+				# just in case, we know what happens.
+
+#define HYPERCALL_PAGE_OFFSET 0x1000
+.org HYPERCALL_PAGE_OFFSET
+ENTRY(hypercall_page)
+.skip 0x1000
+
+/*
+ * Real beginning of normal "text" segment
+ */
+ENTRY(stext)
+ENTRY(_stext)
+
+/*
+ * BSS section
+ */
+.section ".bss.page_aligned","w"
+ENTRY(empty_zero_page)
+	.fill 4096,1,0
+
+/*
+ * This starts the data section.
+ */
+.data
+
+/*
+ * The Global Descriptor Table contains 28 quadwords, per-CPU.
+ */
+ENTRY(cpu_gdt_table)
+	.quad 0x0000000000000000	/* NULL descriptor */
+	.quad 0x0000000000000000	/* 0x0b reserved */
+	.quad 0x0000000000000000	/* 0x13 reserved */
+	.quad 0x0000000000000000	/* 0x1b reserved */
+	.quad 0x0000000000000000	/* 0x20 unused */
+	.quad 0x0000000000000000	/* 0x28 unused */
+	.quad 0x0000000000000000	/* 0x33 TLS entry 1 */
+	.quad 0x0000000000000000	/* 0x3b TLS entry 2 */
+	.quad 0x0000000000000000	/* 0x43 TLS entry 3 */
+	.quad 0x0000000000000000	/* 0x4b reserved */
+	.quad 0x0000000000000000	/* 0x53 reserved */
+	.quad 0x0000000000000000	/* 0x5b reserved */
+
+	.quad 0x00cf9a000000ffff	/* 0x60 kernel 4GB code at 0x00000000 */
+	.quad 0x00cf92000000ffff	/* 0x68 kernel 4GB data at 0x00000000 */
+	.quad 0x00cffa000000ffff	/* 0x73 user 4GB code at 0x00000000 */
+	.quad 0x00cff2000000ffff	/* 0x7b user 4GB data at 0x00000000 */
+
+	.quad 0x0000000000000000	/* 0x80 TSS descriptor */
+	.quad 0x0000000000000000	/* 0x88 LDT descriptor */
+
+	/*
+	 * Segments used for calling PnP BIOS have byte granularity.
+	 * They code segments and data segments have fixed 64k limits,
+	 * the transfer segment sizes are set at run time.
+	 */
+	.quad 0x0000000000000000	/* 0x90 32-bit code */
+	.quad 0x0000000000000000	/* 0x98 16-bit code */
+	.quad 0x0000000000000000	/* 0xa0 16-bit data */
+	.quad 0x0000000000000000	/* 0xa8 16-bit data */
+	.quad 0x0000000000000000	/* 0xb0 16-bit data */
+
+	/*
+	 * The APM segments have byte granularity and their bases
+	 * are set at run time.  All have 64k limits.
+	 */
+	.quad 0x0000000000000000	/* 0xb8 APM CS    code */
+	.quad 0x0000000000000000	/* 0xc0 APM CS 16 code (16 bit) */
+	.quad 0x0000000000000000	/* 0xc8 APM DS    data */
+
+	.quad 0x0000000000000000	/* 0xd0 - ESPFIX 16-bit SS */
+	.quad 0x0000000000000000	/* 0xd8 - unused */
+	.quad 0x0000000000000000	/* 0xe0 - unused */
+	.quad 0x0000000000000000	/* 0xe8 - unused */
+	.quad 0x0000000000000000	/* 0xf0 - unused */
+	.quad 0x0000000000000000	/* 0xf8 - GDT entry 31: double-fault TSS */
+
+/*
+ * __xen_guest information
+ */
+.macro utoa value
+ .if (\value) < 0 || (\value) >= 0x10
+	utoa (((\value)>>4)&0x0fffffff)
+ .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"
+		utoa __PAGE_OFFSET
+#ifdef CONFIG_XEN_COMPAT_030002
+	.ascii	",ELF_PADDR_OFFSET=0x"
+		utoa __PAGE_OFFSET
+#else
+	.ascii	",ELF_PADDR_OFFSET=0x0"
+#endif /* !CONFIG_XEN_COMPAT_030002 */
+	.ascii	",VIRT_ENTRY=0x"
+		utoa (__PAGE_OFFSET + __PHYSICAL_START + VIRT_ENTRY_OFFSET)
+	.ascii	",HYPERCALL_PAGE=0x"
+		utoa ((__PHYSICAL_START+HYPERCALL_PAGE_OFFSET)>>PAGE_SHIFT)
+	.ascii  ",FEATURES=writable_page_tables"
+	.ascii	         "|writable_descriptor_tables"
+	.ascii	         "|auto_translated_physmap"
+	.ascii	         "|pae_pgdir_above_4gb"
+	.ascii	         "|supervisor_mode_kernel"
+#ifdef CONFIG_X86_PAE
+	.ascii	",PAE=yes[extended-cr3]"
+#else
+	.ascii	",PAE=no"
+#endif
+	.ascii	",LOADER=generic"
+	.byte	0