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-rw-r--r--com32/modules/chain.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/com32/modules/chain.c b/com32/modules/chain.c
index 60e3abce..b22caa14 100644
--- a/com32/modules/chain.c
+++ b/com32/modules/chain.c
@@ -132,6 +132,7 @@ static struct options {
bool swap;
bool hide;
bool sethidden;
+ bool drmk;
} opt;
struct data_area {
@@ -786,6 +787,7 @@ Options: file=<loader> Load and execute file, instead of boot sector\n\
freedos=<loader> Load FreeDOS KERNEL.SYS\n\
msdos=<loader> Load MS-DOS IO.SYS\n\
pcdos=<loader> Load PC-DOS IBMBIO.COM\n\
+ drmk=<loader> Load DRMK DELLBIO.BIN\n\
grub=<loader> Load GRUB Legacy stage2\n\
grubcfg=<filename> Set alternative config filename for GRUB Legacy\n\
grldr=<loader> Load GRUB4DOS grldr\n\
@@ -856,6 +858,11 @@ int main(int argc, char *argv[])
opt.seg = 0x70; /* MS-DOS 2.0+ wants this address */
opt.loadfile = argv[i] + 6;
opt.sethidden = true;
+ } else if (!strncmp(argv[i], "drmk=", 5)) {
+ opt.seg = 0x70; /* DRMK wants this address */
+ opt.loadfile = argv[i] + 5;
+ opt.sethidden = true;
+ opt.drmk = true;
} else if (!strncmp(argv[i], "grub=", 5)) {
opt.seg = 0x800; /* stage2 wants this address */
opt.loadfile = argv[i] + 5;
@@ -1202,6 +1209,25 @@ int main(int argc, char *argv[])
}
}
+ if (opt.drmk) {
+ /* DRMK entry is different than MS-DOS/PC-DOS */
+ /*
+ * A new size, aligned to 16 bytes to ease use of ds:[bp+28].
+ * We only really need 4 new, usable bytes at the end.
+ */
+ int tsize = (data[ndata].size + 19) & 0xfffffff0;
+ regs.ss = regs.fs = regs.gs = 0; /* Used before initialized */
+ if (!realloc(data[ndata].data, tsize)) {
+ error("Failed to realloc for DRMK\n");
+ goto bail;
+ }
+ data[ndata].size = tsize;
+ /* ds:[bp+28] must be 0x0000003f */
+ regs.ds = (tsize >> 4) + (opt.seg - 2);
+ /* "Patch" into tail of the new space */
+ *(int *)(data[ndata].data + tsize - 4) = 0x0000003f;
+ }
+
ndata++;
}