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[Qemu-block] [SeaBIOS] [PATCH v2 1/5] geometry: Read LCHS from fw_cfg
From: |
Sam Eiderman |
Subject: |
[Qemu-block] [SeaBIOS] [PATCH v2 1/5] geometry: Read LCHS from fw_cfg |
Date: |
Mon, 17 Jun 2019 18:04:15 +0300 |
Read bios geometry for boot devices from fw_cfg.
By receiving LCHS values directly from QEMU through fw_cfg we will be
able to support logical geometries which can not be inferred by SeaBIOS
itself.
(For instance: A 8GB virtio-blk hard drive which was originally created
as an IDE and must report LCHS of */32/63 for its operating system to
function will always break under SeaBIOS since a LARGE/LBA translation
will be used, causing the number of reported logical heads to be > 32.)
The only LCHS paravirtual interface available at the moment is for IDE
disks (rtc_read() in get_translation()) and it's limited to a maximum
of 4 disks (this code existed in SeaBIOS's translation function before
SCSI and VirtIO were even introduced).
This is why we create a new interface which allows passing LCHS
information per hdd.
Boot device information is serialized in the following way:
* device path (sz string)
* device lchs
...
* device path (sz string)
* device lchs
Device path is a null terminated string in the "Open Firmware" device
path format, the same path as used in bootorder.
Reviewed-by: Karl Heubaum <address@hidden>
Reviewed-by: Arbel Moshe <address@hidden>
Signed-off-by: Sam Eiderman <address@hidden>
---
src/boot.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 79 insertions(+)
diff --git a/src/boot.c b/src/boot.c
index 5acf94fe..b4382041 100644
--- a/src/boot.c
+++ b/src/boot.c
@@ -24,6 +24,84 @@
/****************************************************************
+ * Boot device logical geometry
+ ****************************************************************/
+
+typedef struct BootDeviceLCHSSerialized {
+ u32 lcyls;
+ u32 lheads;
+ u32 lsecs;
+} PACKED BootDeviceLCHSSerialized;
+
+typedef struct BootDeviceLCHS {
+ char *name;
+ u32 lcyls;
+ u32 lheads;
+ u32 lsecs;
+} BootDeviceLCHS;
+
+static BootDeviceLCHS *BiosGeometry VARVERIFY32INIT;
+static int BiosGeometryCount;
+
+static void
+loadBiosGeometry(void)
+{
+ BiosGeometryCount = 0;
+ int fsize;
+ char *f = romfile_loadfile("bios-geometry", &fsize);
+ if (!f)
+ return;
+
+ u32 struct_size = sizeof(BootDeviceLCHSSerialized);
+
+ int i;
+ int str_found = 0;
+
+ for (i = 0; i < fsize; i++) {
+ if (f[i] != '\0')
+ str_found = 1;
+ else if (f[i] == '\0' && str_found) {
+ str_found = 0;
+ i++;
+ if (i + struct_size > fsize)
+ break;
+ i += struct_size - 1;
+ BiosGeometryCount++;
+ } else
+ break;
+ }
+
+ BiosGeometry = malloc_tmphigh(BiosGeometryCount * sizeof(BootDeviceLCHS));
+ if (!BiosGeometry) {
+ warn_noalloc();
+ free(f);
+ BiosGeometryCount = 0;
+ return;
+ }
+
+ dprintf(1, "bios geometry:\n");
+
+ BootDeviceLCHSSerialized *blk;
+ BootDeviceLCHS *d;
+
+ for (i = 0; i < BiosGeometryCount; i++) {
+ d = &BiosGeometry[i];
+ d->name = f;
+ f += strlen(f) + 1;
+
+ blk = (BootDeviceLCHSSerialized *)f;
+ d->lcyls = blk->lcyls;
+ d->lheads = blk->lheads;
+ d->lsecs = blk->lsecs;
+ f += struct_size;
+
+ dprintf(1, "%s: (%u, %u, %u)\n",
+ d->name, d->lcyls, d->lheads, d->lsecs);
+ }
+}
+
+
+/****************************************************************
* Boot priority ordering
****************************************************************/
@@ -288,6 +366,7 @@ boot_init(void)
BootRetryTime = romfile_loadint("etc/boot-fail-wait", 60*1000);
loadBootOrder();
+ loadBiosGeometry();
}
--
2.13.3