Boot environment option 'bios_remap_first'. Thios option remaps the first
BIOS drive to d7, the second BIOS drive to d0, the third to d1, etc. This useful for CD-ROM hardisk emulation.
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@ -36,7 +36,7 @@
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#define ERR (-1) /* general error */
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/* Parameters for the disk drive. */
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#define MAX_DRIVES 4 /* this driver supports 4 drives (d0 - d3)*/
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#define MAX_DRIVES 8 /* this driver supports 8 drives (d0 - d7)*/
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#define MAX_SECS 255 /* bios can transfer this many sectors */
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#define NR_MINORS (MAX_DRIVES * DEV_PER_DRIVE)
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#define SUB_PER_DRIVE (NR_PARTITIONS * NR_PARTITIONS)
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@ -50,16 +50,18 @@ PRIVATE struct wini { /* main drive struct, one entry per drive */
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unsigned heads; /* number of heads */
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unsigned sectors; /* number of sectors per track */
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unsigned open_ct; /* in-use count */
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int drive_id; /* Drive ID at BIOS level */
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int present; /* Valid drive */
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int int13ext; /* IBM/MS INT 13 extensions supported? */
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struct device part[DEV_PER_DRIVE]; /* disks and partitions */
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struct device subpart[SUB_PER_DRIVE]; /* subpartitions */
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} wini[MAX_DRIVES], *w_wn;
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PRIVATE int nr_drives = MAX_DRIVES; /* Number of drives */
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PRIVATE int w_drive; /* selected drive */
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PRIVATE struct device *w_dv; /* device's base and size */
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PRIVATE vir_bytes bios_buf_vir, bios_buf_size;
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PRIVATE phys_bytes bios_buf_phys;
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PRIVATE int remap_first = 0; /* Remap drives for CD HD emulation */
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_PROTOTYPE(int main, (void) );
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FORWARD _PROTOTYPE( struct device *w_prepare, (int device) );
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@ -95,6 +97,12 @@ PRIVATE struct driver w_dtab = {
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*===========================================================================*/
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PUBLIC int main()
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{
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long v;
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v= 0;
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env_parse("bios_remap_first", "d", 0, &v, 0, 1);
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remap_first= v;
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/* Set special disk parameters then call the generic main loop. */
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driver_task(&w_dtab);
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}
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@ -120,7 +128,9 @@ int device;
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} else {
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return(NIL_DEV);
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}
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return(w_drive < nr_drives ? w_dv : NIL_DEV);
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if (w_drive >= MAX_DRIVES || !w_wn->present)
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return NIL_DEV;
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return(w_dv);
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}
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@ -228,7 +238,7 @@ unsigned nr_req; /* length of request vector */
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/* Set up an extended read or write BIOS call. */
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reg86.u.b.intno = 0x13;
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reg86.u.w.ax = opcode == DEV_SCATTER ? 0x4300 : 0x4200;
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reg86.u.b.dl = 0x80 + w_drive;
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reg86.u.b.dl = wn->drive_id;
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reg86.u.w.si = (bios_buf_phys + i13e_rw_off) % HCLICK_SIZE;
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reg86.u.w.ds = (bios_buf_phys + i13e_rw_off) / HCLICK_SIZE;
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} else {
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@ -245,7 +255,7 @@ unsigned nr_req; /* length of request vector */
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reg86.u.b.ch = cylinder & 0xFF;
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reg86.u.b.cl = sector | ((cylinder & 0x300) >> 2);
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reg86.u.b.dh = head;
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reg86.u.b.dl = 0x80 + w_drive;
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reg86.u.b.dl = wn->drive_id;
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}
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r= sys_int86(®86);
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@ -345,7 +355,7 @@ PRIVATE void w_init()
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{
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/* This routine is called at startup to initialize the drive parameters. */
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int r, drive;
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int r, drive, drive_id, nr_drives;
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struct wini *wn;
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unsigned long capacity;
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struct int13ext_params {
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@ -376,19 +386,31 @@ PRIVATE void w_init()
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#endif
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/* Get the geometry of the drives */
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for (drive = 0; drive < nr_drives; drive++) {
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for (drive = 0; drive < MAX_DRIVES; drive++) {
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if (remap_first)
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{
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if (drive == 7)
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drive_id= 0x80;
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else
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drive_id= 0x80 + drive + 1;
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}
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else
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drive_id= 0x80 + drive;
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(void) w_prepare(drive * DEV_PER_DRIVE);
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wn = w_wn;
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wn->drive_id= drive_id;
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reg86.u.b.intno = 0x13;
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reg86.u.b.ah = 0x08; /* Get drive parameters. */
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reg86.u.b.dl = 0x80 + drive;
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reg86.u.b.dl = drive_id;
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r= sys_int86(®86);
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if (r != OK)
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panic(ME, "BIOS call failed", r);
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nr_drives = !(reg86.u.w.f & 0x0001) ? reg86.u.b.dl : drive;
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if (nr_drives > MAX_DRIVES) nr_drives = MAX_DRIVES;
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if (drive >= nr_drives) break;
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if (drive_id >= 0x80 + nr_drives) continue;
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wn->present= 1;
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wn->heads = reg86.u.b.dh + 1;
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wn->sectors = reg86.u.b.cl & 0x3F;
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@ -399,7 +421,7 @@ PRIVATE void w_init()
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reg86.u.b.intno = 0x13;
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reg86.u.b.ah = 0x41; /* INT 13 Extensions - Installation check */
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reg86.u.w.bx = 0x55AA;
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reg86.u.b.dl = 0x80 + drive;
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reg86.u.b.dl = drive_id;
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if (pc_at) {
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r= sys_int86(®86);
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@ -418,7 +440,7 @@ PRIVATE void w_init()
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panic(ME, "sys_vircopy failed\n", r);
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reg86.u.b.intno = 0x13;
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reg86.u.b.ah = 0x48; /* Ext. Get drive parameters. */
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reg86.u.b.dl = 0x80 + drive;
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reg86.u.b.dl = drive_id;
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reg86.u.w.si = bios_buf_phys % HCLICK_SIZE;
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reg86.u.w.ds = bios_buf_phys / HCLICK_SIZE;
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