1 files changed, 96 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/lib/syslinux/pxe_get_cached.c b/contrib/syslinux-4.02/com32/lib/syslinux/pxe_get_cached.c
new file mode 100644
index 0000000..4704037
--- /dev/null
+++ b/contrib/syslinux-4.02/com32/lib/syslinux/pxe_get_cached.c
@@ -0,0 +1,96 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * pxe_get_cached.c
+ *
+ * PXE call "get cached info"
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <com32.h>
+
+#include <syslinux/pxe.h>
+
+/* Returns the status code from PXE (0 on success),
+   or -1 on invocation failure */
+int pxe_get_cached_info(int level, void **buf, size_t * len)
+{
+    const int max_dhcp_packet = 2048;
+    com32sys_t regs;
+    t_PXENV_GET_CACHED_INFO *gci;
+    void *bbuf, *nbuf;
+    int err;
+
+    gci = lmalloc(sizeof *gci + max_dhcp_packet);
+    if (!gci)
+	return -1;
+
+    memset(&regs, 0, sizeof regs);
+    regs.eax.w[0] = 0x0009;
+    regs.ebx.w[0] = PXENV_GET_CACHED_INFO;
+    regs.es = SEG(gci);
+    /* regs.edi.w[0] = OFFS(gci); */
+
+    bbuf = &gci[1];
+
+    gci->Status = PXENV_STATUS_FAILURE;
+    gci->PacketType = level;
+    gci->BufferSize = gci->BufferLimit = max_dhcp_packet;
+    gci->Buffer.seg = SEG(bbuf);
+    gci->Buffer.offs = OFFS(bbuf);
+
+    __intcall(0x22, &regs, &regs);
+
+    if (regs.eflags.l & EFLAGS_CF) {
+	err = -1;
+	goto exit;
+    }
+
+    if (gci->Status) {
+	err = gci->Status;
+	goto exit;
+    }
+
+    nbuf = malloc(gci->BufferSize);
+    if (!nbuf) {
+	err = -1;
+	goto exit;
+    }
+
+    memcpy(nbuf, bbuf, gci->BufferSize);
+
+    *buf = nbuf;
+    *len = gci->BufferSize;
+    err = 0;
+
+exit:
+    lfree(gci);
+    return err;
+}