- Initial checkin of the freebios2 tree

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@784 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 27 insertions, 0 deletions

diff --git a/src/cpu/i386/reset16.inc b/src/cpu/i386/reset16.inc
new file mode 100644
index 0000000000..7c911d9ff2
--- /dev/null
+++ b/src/cpu/i386/reset16.inc
@@ -0,0 +1,27 @@
+	.section ".reset"
+	.code16
+.globl	EXT(reset_vector)
+EXT(reset_vector):
+#if _ROMBASE >= 0xffff0000
+	/* Hmm.
+	 * _start_offset is the low 16 bits of _start.
+	 * Theoretically we should have problems but it compiles
+	 * and links properly with binutils 2.9.5 & 2.10.90
+	 * This is probably a case that needs fixing in binutils.
+	 * And then we can just use _start.
+	 * We also need something like the assume directive in
+	 * other assemblers to tell it where the segment registers
+	 * are pointing in memory right now.
+	 */
+	jmp	EXT(_start_offset)
+#elif (_ROMBASE < 0x100000)
+	ljmp	$((_ROMBASE & 0xf0000)>>4),$EXT(_start_offset);
+#else
+#error	_ROMBASE is an unsupported value
+#endif
+
+	. = 0x8;
+	.code32
+	jmp	EXT(protected_start)
+
+	.previous