chain.c32: prepare for loading DRMK

diff --git a/com32/modules/chain.c b/com32/modules/chain.c
index a5f6401..c32da11 100644 (file)
--- a/com32/modules/chain.c
+++ b/com32/modules/chain.c
@@ -133,6 +133,7 @@ static struct options {
     bool swap;
     bool hide;
     bool sethidden;
+    bool drmk;
 } opt;
 
 struct data_area {
@@ -1351,6 +1352,11 @@ 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] + 6;
+           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;
@@ -1697,6 +1703,31 @@ int main(int argc, char *argv[])
            }
        }
 
+       if (opt.drmk) {
+           /* DRMK entry is different */
+           /*
+            * A new size, aligned to 16 bytes, with one full extra row to
+            * guarantee the needed space and ease other values.
+            */
+           int tsize = (data[ndata].size + 31) & 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) - 2;
+           
+           /* loadfile(opt.loadfile, &data[ndata].data, &data[ndata].size) */
+
+       }
+// dl=drive    bp=0    cs=0x0070       ss=0
+// ds=0x2000 old code segment
+// bx=bytes of whole blocks(1024) loaded of file: fileSize & 0xFC00    probably just garbage remnants
+// fs,gs: zero so unlikely
+
+
        ndata++;
     }