[Xen-devel] [PATCH] LBA48 support in rombios

[Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>]

INT13 LBA48 support for disks bigger than 128GB. The new limit should be
2TB.

Signed-off-by: Samuel Thibault <samuel.thibault@xxxxxxxxxx>

diff -r d048ef27cb02 tools/firmware/rombios/rombios.c
--- a/tools/firmware/rombios/rombios.c  Fri Nov 09 15:21:01 2007 +0000
+++ b/tools/firmware/rombios/rombios.c  Mon Nov 12 14:26:16 2007 +0000
@@ -2538,7 +2538,10 @@
         case ATA_TYPE_ATA:
           printf("ata%d %s: ",channel,slave?" slave":"master");
           i=0; while(c=read_byte(get_SS(),model+i++)) printf("%c",c);
-          printf(" ATA-%d Hard-Disk (%d MBytes)\n",version,(Bit16u)sizeinmb);
+          if (sizeinmb < 1UL<<16)
+            printf(" ATA-%d Hard-Disk (%04u 
MBytes)\n",version,(Bit16u)sizeinmb);
+          else
+            printf(" ATA-%d Hard-Disk (%04u 
GBytes)\n",version,(Bit16u)(sizeinmb>>10));
           break;
         case ATA_TYPE_ATAPI:
           printf("ata%d %s: ",channel,slave?" slave":"master");
@@ -2671,8 +2674,28 @@
   if (mode == ATA_MODE_PIO32) blksize>>=2;
   else blksize>>=1;
 
+  // Reset count of transferred data
+  write_word(ebda_seg, &EbdaData->ata.trsfsectors,0);
+  write_dword(ebda_seg, &EbdaData->ata.trsfbytes,0L);
+  current = 0;
+
+  status = inb(iobase1 + ATA_CB_STAT);
+  if (status & ATA_CB_STAT_BSY) return 1;
+
+  outb(iobase2 + ATA_CB_DC, ATA_CB_DC_HD15 | ATA_CB_DC_NIEN);
+
   // sector will be 0 only on lba access. Convert to lba-chs
   if (sector == 0) {
+    if ((count >= 1 << 8) || (lba + count >= 1UL << 28)) {
+      outb(iobase1 + ATA_CB_FR, 0x00);
+      outb(iobase1 + ATA_CB_SC, (count >> 8) & 0xff);
+      outb(iobase1 + ATA_CB_SN, lba >> 24);
+      outb(iobase1 + ATA_CB_CL, 0);
+      outb(iobase1 + ATA_CB_CH, 0);
+      command |= 0x04;
+      count &= (1UL << 8) - 1;
+      lba &= (1UL << 24) - 1;
+      }
     sector = (Bit16u) (lba & 0x000000ffL);
     lba >>= 8;
     cylinder = (Bit16u) (lba & 0x0000ffffL);
@@ -2680,15 +2703,6 @@
     head = ((Bit16u) (lba & 0x0000000fL)) | 0x40;
     }
 
-  // Reset count of transferred data
-  write_word(ebda_seg, &EbdaData->ata.trsfsectors,0);
-  write_dword(ebda_seg, &EbdaData->ata.trsfbytes,0L);
-  current = 0;
-
-  status = inb(iobase1 + ATA_CB_STAT);
-  if (status & ATA_CB_STAT_BSY) return 1;
-
-  outb(iobase2 + ATA_CB_DC, ATA_CB_DC_HD15 | ATA_CB_DC_NIEN);
   outb(iobase1 + ATA_CB_FR, 0x00);
   outb(iobase1 + ATA_CB_SC, count);
   outb(iobase1 + ATA_CB_SN, sector);
@@ -2814,8 +2828,28 @@
   if (mode == ATA_MODE_PIO32) blksize>>=2;
   else blksize>>=1;
 
+  // Reset count of transferred data
+  write_word(ebda_seg, &EbdaData->ata.trsfsectors,0);
+  write_dword(ebda_seg, &EbdaData->ata.trsfbytes,0L);
+  current = 0;
+
+  status = inb(iobase1 + ATA_CB_STAT);
+  if (status & ATA_CB_STAT_BSY) return 1;
+
+  outb(iobase2 + ATA_CB_DC, ATA_CB_DC_HD15 | ATA_CB_DC_NIEN);
+
   // sector will be 0 only on lba access. Convert to lba-chs
   if (sector == 0) {
+    if ((count >= 1 << 8) || (lba + count >= 1UL << 28)) {
+      outb(iobase1 + ATA_CB_FR, 0x00);
+      outb(iobase1 + ATA_CB_SC, (count >> 8) & 0xff);
+      outb(iobase1 + ATA_CB_SN, lba >> 24);
+      outb(iobase1 + ATA_CB_CL, 0);
+      outb(iobase1 + ATA_CB_CH, 0);
+      command |= 0x04;
+      count &= (1UL << 8) - 1;
+      lba &= (1UL << 24) - 1;
+      }
     sector = (Bit16u) (lba & 0x000000ffL);
     lba >>= 8;
     cylinder = (Bit16u) (lba & 0x0000ffffL);
@@ -2823,15 +2857,6 @@
     head = ((Bit16u) (lba & 0x0000000fL)) | 0x40;
     }
 
-  // Reset count of transferred data
-  write_word(ebda_seg, &EbdaData->ata.trsfsectors,0);
-  write_dword(ebda_seg, &EbdaData->ata.trsfbytes,0L);
-  current = 0;
-
-  status = inb(iobase1 + ATA_CB_STAT);
-  if (status & ATA_CB_STAT_BSY) return 1;
-
-  outb(iobase2 + ATA_CB_DC, ATA_CB_DC_HD15 | ATA_CB_DC_NIEN);
   outb(iobase1 + ATA_CB_FR, 0x00);
   outb(iobase1 + ATA_CB_SC, count);
   outb(iobase1 + ATA_CB_SN, sector);

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel