aboutsummaryrefslogtreecommitdiffstats
path: root/com32/modules
diff options
context:
space:
mode:
authorH. Peter Anvin <hpa@zytor.com>2009-09-10 14:25:14 -0700
committerH. Peter Anvin <hpa@zytor.com>2009-09-10 14:25:14 -0700
commit08d95ca91f87a0c8ec452bb17e837e845738d530 (patch)
tree698101452bb0850e0784b8d0f791db8d31c72e63 /com32/modules
parent03ae23accc283e673c5bce8b89c5c1b6e177bcb2 (diff)
downloadsyslinux.git-08d95ca91f87a0c8ec452bb17e837e845738d530.tar.gz
syslinux.git-08d95ca91f87a0c8ec452bb17e837e845738d530.tar.xz
syslinux.git-08d95ca91f87a0c8ec452bb17e837e845738d530.zip
gpxecmd: module to send an arbitrary command to gPXEsyslinux-3.83-pre11
Simple module to send an arbitrary command to gPXE, assuming the gPXE CLI API is available. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'com32/modules')
-rw-r--r--com32/modules/Makefile8
-rw-r--r--com32/modules/gpxecmd.c137
2 files changed, 141 insertions, 4 deletions
diff --git a/com32/modules/Makefile b/com32/modules/Makefile
index c93d3afc..52327b61 100644
--- a/com32/modules/Makefile
+++ b/com32/modules/Makefile
@@ -18,10 +18,10 @@
topdir = ../..
include ../MCONFIG
-MODULES = chain.c32 config.c32 ethersel.c32 dmitest.c32 cpuidtest.c32 disk.c32 \
- pcitest.c32 elf.c32 linux.c32 reboot.c32 pmload.c32 meminfo.c32 \
- sdi.c32 sanboot.c32 ifcpu64.c32 vesainfo.c32 kbdmap.c32 cmd.c32 \
- vpdtest.c32
+MODULES = chain.c32 config.c32 ethersel.c32 dmitest.c32 cpuidtest.c32 \
+ disk.c32 pcitest.c32 elf.c32 linux.c32 reboot.c32 pmload.c32 \
+ meminfo.c32 sdi.c32 sanboot.c32 ifcpu64.c32 vesainfo.c32 \
+ kbdmap.c32 cmd.c32 vpdtest.c32 gpxecmd.c32
TESTFILES =
diff --git a/com32/modules/gpxecmd.c b/com32/modules/gpxecmd.c
new file mode 100644
index 00000000..de6ffb21
--- /dev/null
+++ b/com32/modules/gpxecmd.c
@@ -0,0 +1,137 @@
+/* ----------------------------------------------------------------------- *
+ *
+ * Copyright 2008 H. Peter Anvin - All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston MA 02110-1301, USA; either version 2 of the License, or
+ * (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * gpxecmd.c
+ *
+ * Invoke an arbitrary gPXE command, if available.
+ */
+
+#include <alloca.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <console.h>
+#include <com32.h>
+#include <stdbool.h>
+#include <string.h>
+#include <syslinux/config.h>
+
+struct segoff16 {
+ uint16_t offs, seg;
+};
+
+struct s_PXENV_FILE_CHECK_API {
+ uint16_t Status;
+ uint16_t Size;
+ uint32_t Magic;
+ uint32_t Provider;
+ uint32_t APIMask;
+ uint32_t Flags;
+};
+
+static bool is_gpxe(void)
+{
+ const struct syslinux_version *sv;
+ com32sys_t reg;
+ struct s_PXENV_FILE_CHECK_API *fca;
+
+ sv = syslinux_version();
+ if (sv->filesystem != SYSLINUX_FS_PXELINUX)
+ return false; /* Not PXELINUX */
+
+ fca = __com32.cs_bounce;
+ memset(fca, 0, sizeof *fca);
+ fca->Size = sizeof *fca;
+ fca->Magic = 0x91d447b2;
+
+ memset(&reg, 0, sizeof reg);
+ reg.eax.w[0] = 0x0009;
+ reg.ebx.w[0] = 0x00e6; /* PXENV_FILE_API_CHECK */
+ reg.edi.w[0] = OFFS(fca);
+ reg.es = SEG(fca);
+
+ __intcall(0x22, &reg, &reg);
+
+ if (reg.eflags.l & EFLAGS_CF)
+ return false; /* Cannot invoke PXE stack */
+
+ if (reg.eax.w[0] || fca->Status)
+ return false; /* PXE failure */
+
+ if (fca->Magic != 0xe9c17b20)
+ return false; /* Incorrect magic */
+
+ if (fca->Size < sizeof *fca)
+ return false; /* Short return */
+
+ if (!(fca->APIMask & (1 << 5)))
+ return false; /* No FILE EXEC */
+
+ return true;
+}
+
+struct s_PXENV_FILE_EXEC {
+ uint16_t Status;
+ struct segoff16 Command;
+};
+
+static void gpxecmd(const char **args)
+{
+ char *q;
+ struct s_PXENV_FILE_EXEC *fx;
+ com32sys_t reg;
+
+ memset(&reg, 0, sizeof reg);
+
+ fx = __com32.cs_bounce;
+ q = (char *)(fx + 1);
+
+ fx->Status = 1;
+ fx->Command.offs = OFFS(q);
+ fx->Command.seg = SEG(q);
+
+ while (*args) {
+ q = stpcpy(q, *args);
+ *q++ = ' ';
+ args++;
+ }
+ *--q = '\0';
+
+ memset(&reg, 0, sizeof reg);
+ reg.eax.w[0] = 0x0009;
+ reg.ebx.w[0] = 0x00e5; /* PXENV_FILE_EXEC */
+ reg.edi.w[0] = OFFS(fx);
+ reg.es = SEG(fx);
+
+ __intcall(0x22, &reg, &reg);
+
+ /* This should not return... */
+}
+
+int main(int argc, const char *argv[])
+{
+ openconsole(&dev_null_r, &dev_stdcon_w);
+
+ if (argc < 2) {
+ printf("Usage: gpxecmd command...\n");
+ return 1;
+ }
+
+ if (!is_gpxe()) {
+ printf("gpxecmd: gPXE API not detected\n");
+ return 1;
+ }
+
+ gpxecmd(argv + 1);
+
+ return 0;
+}