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authorIngo Molnar <mingo@elte.hu>2008-03-21 14:23:19 (GMT)
committerIngo Molnar <mingo@elte.hu>2008-04-17 15:41:37 (GMT)
commit77ad386e596c6b0930cc2e09e3cce485e3ee7f72 (patch)
tree5c4a9b664c8ecf8147996a32eae35ff7e7350f89 /arch/x86/kernel/trampoline.c
parente44b7b7525ad9d43163ab5e60c784325419e0ea6 (diff)
downloadlinux-77ad386e596c6b0930cc2e09e3cce485e3ee7f72.tar.xz
x86: standalone trampoline code
move the trampoline setup code out of smpboot.c - UP kernels can have suspend support too. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/trampoline.c')
-rw-r--r--arch/x86/kernel/trampoline.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/kernel/trampoline.c b/arch/x86/kernel/trampoline.c
new file mode 100644
index 0000000..abbf199
--- /dev/null
+++ b/arch/x86/kernel/trampoline.c
@@ -0,0 +1,18 @@
+#include <linux/io.h>
+
+#include <asm/trampoline.h>
+
+/* ready for x86_64, no harm for x86, since it will overwrite after alloc */
+unsigned char *trampoline_base = __va(TRAMPOLINE_BASE);
+
+/*
+ * Currently trivial. Write the real->protected mode
+ * bootstrap into the page concerned. The caller
+ * has made sure it's suitably aligned.
+ */
+unsigned long setup_trampoline(void)
+{
+ memcpy(trampoline_base, trampoline_data,
+ trampoline_end - trampoline_data);
+ return virt_to_phys(trampoline_base);
+}