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authorThomas Gleixner <tglx@linutronix.de>2007-10-11 11:17:01 +0200
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 11:17:01 +0200
commit9a163ed8e0552fdcffe405d2ea7134819a81456e (patch)
treeb322fd2afbb812ba7ddfd22f3734aaab007c2aa5 /arch/x86/kernel/trampoline_32.S
parentf7627e2513987bb5d4e8cb13c4e0a478352141ac (diff)
i386: move kernel
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/trampoline_32.S')
-rw-r--r--arch/x86/kernel/trampoline_32.S85
1 files changed, 85 insertions, 0 deletions
diff --git a/arch/x86/kernel/trampoline_32.S b/arch/x86/kernel/trampoline_32.S
new file mode 100644
index 000000000000..f62815f8d06a
--- /dev/null
+++ b/arch/x86/kernel/trampoline_32.S
@@ -0,0 +1,85 @@
+/*
+ *
+ * Trampoline.S Derived from Setup.S by Linus Torvalds
+ *
+ * 4 Jan 1997 Michael Chastain: changed to gnu as.
+ *
+ * This is only used for booting secondary CPUs in SMP machine
+ *
+ * Entry: CS:IP point to the start of our code, we are
+ * in real mode with no stack, but the rest of the
+ * trampoline page to make our stack and everything else
+ * is a mystery.
+ *
+ * In fact we don't actually need a stack so we don't
+ * set one up.
+ *
+ * We jump into the boot/compressed/head.S code. So you'd
+ * better be running a compressed kernel image or you
+ * won't get very far.
+ *
+ * On entry to trampoline_data, the processor is in real mode
+ * with 16-bit addressing and 16-bit data. CS has some value
+ * and IP is zero. Thus, data addresses need to be absolute
+ * (no relocation) and are taken with regard to r_base.
+ *
+ * If you work on this file, check the object module with
+ * objdump --reloc to make sure there are no relocation
+ * entries except for:
+ *
+ * TYPE VALUE
+ * R_386_32 startup_32_smp
+ * R_386_32 boot_gdt
+ */
+
+#include <linux/linkage.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+
+.data
+
+/* We can free up trampoline after bootup if cpu hotplug is not supported. */
+#ifndef CONFIG_HOTPLUG_CPU
+.section ".init.data","aw",@progbits
+#endif
+
+.code16
+
+ENTRY(trampoline_data)
+r_base = .
+ wbinvd # Needed for NUMA-Q should be harmless for others
+ mov %cs, %ax # Code and data in the same place
+ mov %ax, %ds
+
+ cli # We should be safe anyway
+
+ movl $0xA5A5A5A5, trampoline_data - r_base
+ # write marker for master knows we're running
+
+ /* GDT tables in non default location kernel can be beyond 16MB and
+ * lgdt will not be able to load the address as in real mode default
+ * operand size is 16bit. Use lgdtl instead to force operand size
+ * to 32 bit.
+ */
+
+ lidtl boot_idt_descr - r_base # load idt with 0, 0
+ lgdtl boot_gdt_descr - r_base # load gdt with whatever is appropriate
+
+ xor %ax, %ax
+ inc %ax # protected mode (PE) bit
+ lmsw %ax # into protected mode
+ # flush prefetch and jump to startup_32_smp in arch/i386/kernel/head.S
+ ljmpl $__BOOT_CS, $(startup_32_smp-__PAGE_OFFSET)
+
+ # These need to be in the same 64K segment as the above;
+ # hence we don't use the boot_gdt_descr defined in head.S
+boot_gdt_descr:
+ .word __BOOT_DS + 7 # gdt limit
+ .long boot_gdt - __PAGE_OFFSET # gdt base
+
+boot_idt_descr:
+ .word 0 # idt limit = 0
+ .long 0 # idt base = 0L
+
+.globl trampoline_end
+trampoline_end: