diff options
| -rw-r--r-- | com32/modules/Makefile | 8 | ||||
| -rw-r--r-- | com32/modules/gpxecmd.c | 137 |
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(®, 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, ®, ®); + + 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(®, 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(®, 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, ®, ®); + + /* 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; +} |