ldlinux: Add support for Auxillary Data Vector

Move all the code for the ADV into ldlinux so that it doesn't have any
dependencies on other modules.

We also need a way to initialize the ADV from ldlinux, so add another
vector to the comboot API.

Signed-off-by: Matt Fleming <matt.fleming@linux.intel.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/com32/elflink/ldlinux/advwrite.c b/com32/elflink/ldlinux/advwrite.c
new file mode 100644
index 00000000..4152eea5
--- /dev/null
+++ b/com32/elflink/ldlinux/advwrite.c
@@ -0,0 +1,45 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2007-2008 H. Peter Anvin - All Rights Reserved
+ *
+ *   Permission is hereby granted, free of charge, to any person
+ *   obtaining a copy of this software and associated documentation
+ *   files (the "Software"), to deal in the Software without
+ *   restriction, including without limitation the rights to use,
+ *   copy, modify, merge, publish, distribute, sublicense, and/or
+ *   sell copies of the Software, and to permit persons to whom
+ *   the Software is furnished to do so, subject to the following
+ *   conditions:
+ *
+ *   The above copyright notice and this permission notice shall
+ *   be included in all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *   OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * syslinux/advwrite.c
+ *
+ * Write back the ADV
+ */
+
+#include <syslinux/adv.h>
+#include <klibc/compiler.h>
+#include <com32.h>
+
+int syslinux_adv_write(void)
+{
+    static com32sys_t reg;
+
+    reg.eax.w[0] = 0x001d;
+    __intcall(0x22, &reg, &reg);
+    return (reg.eflags.l & EFLAGS_CF) ? -1 : 0;
+}