Laurent Vivier wrote:
This patch allows to select and boot from an option ROM
with a Boot Connection Vector (BCV) entry.
The BIOS detects the BCV option ROM and adds it to the IPL table, and then
you are able to select it to boot.
This patch has been tested with Bochs BIOS version from the KVM source tree
and a gPXE ROM modified to be a BCV one.
Any plans to convert extboot into a compatible option rom?
Signed-off-by: Laurent Vivier <[EMAIL PROTECTED]>
---
bios/rombios.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++-----
1 files changed, 64 insertions(+), 7 deletions(-)
diff --git a/bios/rombios.c b/bios/rombios.c
index 9a1cdd6..70b3584 100644
--- a/bios/rombios.c
+++ b/bios/rombios.c
@@ -180,7 +180,11 @@
might as well also add
#define IPL_TYPE_RESERVED 0x00
#define IPL_TYPE_FLOPPY 0x01
#define IPL_TYPE_HARDDISK 0x02
#define IPL_TYPE_CDROM 0x03
+#define IPL_TYPE_PCMCIA 0x04
+#define IPL_TYPE_USBDEVICE 0x05
+#define IPL_TYPE_NETWORK 0x06
Should this be somehow marked as embedded network? Maybe a comment.
#define IPL_TYPE_BEV 0x80
+#define IPL_TYPE_UNKNOWN 0xff
// Sanity Checks
#if BX_USE_ATADRV && BX_CPU<3
@@ -2009,6 +2013,31 @@ Bit16u i; ipl_entry_t *e;
return 1;
}
+static Bit8u
+get_bootdrv(i)
+Bit16u i;
+{
+ Bit16u count;
+ Bit16u type;
+ Bit16u curr_type;
+ Bit16u curr;
+ Bit16u drv;
+ /* Get the count of boot devices, and refuse to overrun the array */
+ count = read_word(IPL_SEG, IPL_COUNT_OFFSET);
+ if (i >= count) return 0;
Add a comment that we return "floppy" on overrun?
+ type = read_word(IPL_SEG, IPL_TABLE_OFFSET + i * sizeof (ipl_entry_t),
+ sizeof(Bit16u));
+ if (type != IPL_TYPE_HARDDISK)
+ return 0;
+ for (curr = 0, drv = 0; curr < i; curr++) {
+ curr_type = read_word(IPL_SEG,
+ IPL_TABLE_OFFSET + curr * sizeof (ipl_entry_t),
+ sizeof(Bit16u));
+ if (type == curr_type) drv++;
+ }
+ return 0x80 + drv;
+}
+
#if BX_ELTORITO_BOOT
void
interactive_bootkey()
@@ -2047,8 +2076,15 @@ interactive_bootkey()
case IPL_TYPE_FLOPPY:
case IPL_TYPE_HARDDISK:
case IPL_TYPE_CDROM:
- printf("%s\n", drivetypes[e.type]);
- break;
+ printf("%s", drivetypes[e.type]);
+ if (e.description != 0)
+ {
+ memcpyb(ss, &description, (Bit16u)(e.description >> 16),
(Bit16u)(e.description & 0xffff), 32);
+ description[32] = 0;
+ printf(" [%S]", ss, description);
+ }
+ printf("\n");
+ break;
case IPL_TYPE_BEV:
printf("%s", drivetypes[4]);
if (e.description != 0)
@@ -8045,7 +8081,7 @@ Bit16u seq_nr;
case IPL_TYPE_FLOPPY: /* FDD */
case IPL_TYPE_HARDDISK: /* HDD */
- bootdrv = (e.type == IPL_TYPE_HARDDISK) ? 0x80 : 0x00;
+ bootdrv = get_bootdrv(bootdev);
bootseg = 0x07c0;
status = 0;
@@ -10245,10 +10281,11 @@ block_count_rounded:
mov bx, 0x001a ;; 0x1A is the offset into ROM header that contains...
mov ax, [bx] ;; the offset of PnP expansion header, where...
cmp ax, #0x5024 ;; we look for signature "$PnP"
- jne no_bev
+ jne no_pnp
mov ax, 2[bx]
cmp ax, #0x506e
- jne no_bev
+ jne no_pnp
+ ;; Look for the Bootstrap Entry Vector (BEV)
mov ax, 0x1a[bx] ;; 0x1A is also the offset into the expansion header of...
cmp ax, #0x0000 ;; the Bootstrap Entry Vector, or zero if there is none.
je no_bev
@@ -10259,9 +10296,29 @@ block_count_rounded:
mov ds, bx
mov bx, IPL_COUNT_OFFSET ;; Read the number of entries so far
cmp bx, #IPL_TABLE_ENTRIES
- je no_bev ;; Get out if the table is full
+ je no_pnp ;; Get out if the table is full
shl bx, #0x4 ;; Turn count into offset (entries are 16 bytes)
mov 0[bx], #IPL_TYPE_BEV ;; This entry is a BEV device
+ jmp add_ipl
+
+no_bev:
+ ;; Look for the Boot Connection Vector (BCV)
+ mov ax, 0x16[bx] ;; 0x16 is also the offset into the expansion header of...
"also" is wrong in this comment
+ cmp ax, #0x0000 ;; the Boots Entry Vector, or zero if there is none.
Boot Connection Vector
+ je no_pnp
+
+ ;; Found a device that thinks it can boot the system.
+ mov di, 0x10[bx] ;; Pointer to the product name string or zero
if none
+ mov bx, #IPL_SEG ;; Go to the segment where the IPL table lives
+ mov ds, bx
+ mov bx, IPL_COUNT_OFFSET ;; Read the number of entries so far
+ cmp bx, #IPL_TABLE_ENTRIES
+ je no_pnp ;; Get out if the table is full
+ shl bx, #0x4 ;; Turn count into offset (entries are 16 bytes)
+ mov 0[bx], #IPL_TYPE_HARDDISK ;; This entry is a BEV device
BCV device
+
+add_ipl:
+
mov 6[bx], cx ;; Build a far pointer from the segment...
mov 4[bx], ax ;; and the offset
cmp di, #0x0000
@@ -10273,7 +10330,7 @@ no_prod_str:
inc bx ;; We have one more entry now
mov IPL_COUNT_OFFSET, bx ;; Remember that.
-no_bev:
+no_pnp:
pop di ;; Restore DI
pop ax ;; Restore AX
rom_scan_increment:
--
- Sebastian
--
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