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authorH. Peter Anvin <hpa@zytor.com>2009-06-26 17:44:22 -0700
committerH. Peter Anvin <hpa@zytor.com>2009-06-26 17:44:22 -0700
commitb1deeb181382bad22846f9c467b64fbda6665e8f (patch)
treedab19a181948aab07de5d0be28dec020f556757d /dosutil
parent621eb2d9deb094d78001f841f3aadcf0f63f2477 (diff)
downloadsyslinux.git-b1deeb181382bad22846f9c467b64fbda6665e8f.tar.gz
syslinux.git-b1deeb181382bad22846f9c467b64fbda6665e8f.tar.xz
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Create a dosutil subdirectory and move mdiskchk there
DOS utilities aren't really "samples". Create a dedicated "dosutil" directory, and move mdiskchk there for now. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'dosutil')
-rw-r--r--dosutil/mdiskchk.c146
-rwxr-xr-xdosutil/mdiskchk.combin0 -> 9680 bytes
2 files changed, 146 insertions, 0 deletions
diff --git a/dosutil/mdiskchk.c b/dosutil/mdiskchk.c
new file mode 100644
index 00000000..eec5be40
--- /dev/null
+++ b/dosutil/mdiskchk.c
@@ -0,0 +1,146 @@
+/* -*- c -*- ------------------------------------------------------------- *
+ *
+ * Copyright 2003-2008 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., 53 Temple Place Ste 330,
+ * Boston MA 02111-1307, USA; either version 2 of the License, or
+ * (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * mdiskchk.c
+ *
+ * DOS program to check for the existence of a memdisk.
+ *
+ * This program can be compiled for DOS with the OpenWatcom compiler
+ * (http://www.openwatcom.org/):
+ *
+ * wcl -3 -osx -mt mdiskchk.c
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <i86.h> /* For MK_FP() */
+
+typedef unsigned long uint32_t;
+typedef unsigned short uint16_t;
+typedef unsigned char uint8_t;
+
+struct memdiskinfo {
+ uint16_t bytes; /* Bytes from memdisk */
+ uint16_t version; /* Memdisk version */
+ uint32_t base; /* Base of disk in high memory */
+ uint32_t size; /* Size of disk in sectors */
+ char far *cmdline; /* Command line */
+ void far *oldint13; /* Old INT 13h */
+ void far *oldint15; /* Old INT 15h */
+ uint16_t olddosmem;
+ uint8_t bootloaderid;
+
+ uint8_t _pad;
+
+ /* We add our own fields at the end */
+ int cylinders;
+ int heads;
+ int sectors;
+};
+
+struct memdiskinfo *query_memdisk(int drive)
+{
+ static struct memdiskinfo mm;
+ uint32_t _eax, _ebx, _ecx, _edx;
+ uint16_t _es, _di;
+ unsigned char _dl = drive;
+ uint16_t bytes;
+
+ __asm {
+ .386;
+ mov eax, 454 d0800h;
+ mov ecx, 444 d0000h;
+ mov edx, 53490000 h;
+ mov dl, _dl;
+ mov ebx, 3f 4 b0000h;
+ int 13 h;
+ mov _eax, eax;
+ mov _ecx, ecx;
+ mov _edx, edx;
+ mov _ebx, ebx;
+ mov _es, es;
+ mov _di, di;
+ }
+
+ if (_eax >> 16 != 0x4d21 ||
+ _ecx >> 16 != 0x4d45 || _edx >> 16 != 0x4944 || _ebx >> 16 != 0x4b53)
+ return NULL;
+
+ memset(&mm, 0, sizeof mm);
+
+ bytes = *(uint16_t far *) MK_FP(_es, _di);
+
+ /* 27 is the most we know how to handle */
+ if (bytes > 27)
+ bytes = 27;
+
+ _fmemcpy((void far *)&mm, (void far *)MK_FP(_es, _di), bytes);
+
+ mm.cylinders = ((_ecx >> 8) & 0xff) + ((_ecx & 0xc0) << 2) + 1;
+ mm.heads = ((_edx >> 8) & 0xff) + 1;
+ mm.sectors = (_ecx & 0x3f);
+
+ return &mm;
+}
+
+const char *bootloadername(uint8_t id)
+{
+ static const struct {
+ uint8_t id, mask;
+ const char *name;
+ } *lp, list[] = {
+ {
+ 0x00, 0xf0, "LILO"}, {
+ 0x10, 0xf0, "LOADLIN"}, {
+ 0x31, 0xff, "SYSLINUX"}, {
+ 0x32, 0xff, "PXELINUX"}, {
+ 0x33, 0xff, "ISOLINUX"}, {
+ 0x34, 0xff, "EXTLINUX"}, {
+ 0x30, 0xf0, "SYSLINUX family"}, {
+ 0x40, 0xf0, "Etherboot"}, {
+ 0x50, 0xf0, "ELILO"}, {
+ 0x70, 0xf0, "GrUB"}, {
+ 0x80, 0xf0, "U-Boot"}, {
+ 0xA0, 0xf0, "Gujin"}, {
+ 0xB0, 0xf0, "Qemu"}, {
+ 0x00, 0x00, "unknown"}
+ };
+
+ for (lp = list;; lp++) {
+ if (((id ^ lp->id) & lp->mask) == 0)
+ return lp->name;
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ int d;
+ int found = 0;
+ struct memdiskinfo *m;
+
+ for (d = 0; d <= 0xff; d++) {
+ if ((m = query_memdisk(d)) != NULL) {
+ printf("Drive %02X is MEMDISK %u.%02u:\n"
+ "\tAddress = 0x%08lx, len = %lu sectors, chs = %u/%u/%u,\n"
+ "\tloader = 0x%02x (%s),\n"
+ "\tcmdline = %Fs\n",
+ d, m->version >> 8, m->version & 0xff,
+ m->base, m->size, m->cylinders, m->heads, m->sectors,
+ m->bootloaderid, bootloadername(m->bootloaderid),
+ m->cmdline);
+ found++;
+ }
+ }
+
+ return found;
+}
diff --git a/dosutil/mdiskchk.com b/dosutil/mdiskchk.com
new file mode 100755
index 00000000..07e1471b
--- /dev/null
+++ b/dosutil/mdiskchk.com
Binary files differ