[SeaBIOS] [PATCH v2 00/19] SeaBIOS as Compatibility Support Module for UEFI/OVMF

Fri Feb 8 15:50:35 CET 2013

On Fri, 2013-02-08 at 14:45 +0000, Ian Campbell wrote:
> 
> I don't see this with rel-1.7.2. Bisecting fingers
>         commit 6ca0460fbb8ecfa5d42c8928b7ee71f20d0cffdb
>         Author: Kevin O'Connor <kevin at koconnor.net>
>         Date:   Mon Jan 21 11:38:49 2013 -0500
>         
>             POST: Reorganize post entry and "preinit" functions.
>         
> But it doesn't look like this changes the order of anything, 

Except Xen is entering via handle_post not handle_elf, so it does change
something, specifically xen_preinit() isn't called before
make_bios_writable so the usingXen in there doesn't trigger. Xen
(actually hvmloader) launches SeaBIOS with "ljmp $0xf000,$0xfff0" so I
think handle_post is the expected landing point.

The patch below fixes this issue for me, however even with that and
CONFIG_DEBUG_LEVEL=2 I still don't see the expected "Using pmtimer"
message. Full messages are below, SeaBIOS starts at "Invoking
SeaBIOS ..."

Linux does see the PM-Timer:
        ACPI: PM-Timer IO Port: 0xb008
Although it doesn't use it because it prefers the Xen virtual timers.

The patch:

diff --git a/src/post.c b/src/post.c
index ae5e923..78ef4b1 100644
--- a/src/post.c
+++ b/src/post.c
@@ -315,9 +315,6 @@ dopost(void)
     // Make sure legacy DMA isn't running.
     dma_preinit();
 
-    // Check if we are running under Xen.
-    xen_preinit();
-
     // Detect ram and setup internal malloc.
     qemu_cfg_preinit();
     if (CONFIG_COREBOOT)
@@ -357,6 +354,9 @@ handle_post(void)
 {
     debug_splash();
 
+    // Check if we are running under Xen.
+    xen_preinit();
+
     // Allow writes to modify bios area (0xf0000)
     make_bios_writable();
 
Logs:

(XEN) HVM164: HVM Loader
(XEN) HVM164: Detected Xen v4.3-unstable
(XEN) HVM164: Xenbus rings @0xfeffc000, event channel 4
(XEN) HVM164: System requested SeaBIOS
(XEN) HVM164: CPU speed is 2400 MHz
(XEN) HVM164: PCI-ISA link 0 routed to IRQ5
(XEN) HVM164: PCI-ISA link 1 routed to IRQ10
(XEN) HVM164: PCI-ISA link 2 routed to IRQ11
(XEN) HVM164: PCI-ISA link 3 routed to IRQ5
(XEN) HVM164: pci dev 01:3 INTA->IRQ10
(XEN) HVM164: pci dev 03:0 INTA->IRQ5
(XEN) HVM164: pci dev 04:0 INTA->IRQ5
(XEN) HVM164: pci dev 02:0 bar 10 size lx: 02000000
(XEN) HVM164: pci dev 03:0 bar 14 size lx: 01000000
(XEN) HVM164: pci dev 04:0 bar 10 size lx: 00020000
(XEN) HVM164: pci dev 04:0 bar 30 size lx: 00020000
(XEN) HVM164: pci dev 02:0 bar 30 size lx: 00010000
(XEN) HVM164: pci dev 02:0 bar 14 size lx: 00001000
(XEN) HVM164: pci dev 03:0 bar 10 size lx: 00000100
(XEN) HVM164: pci dev 04:0 bar 14 size lx: 00000040
(XEN) HVM164: pci dev 01:1 bar 20 size lx: 00000010
(XEN) HVM164: Multiprocessor initialisation:
(XEN) HVM164:  - CPU0 ... 36-bit phys ... fixed MTRRs ... var MTRRs [2/8] ... done.
(XEN) HVM164:  - CPU1 ... 36-bit phys ... fixed MTRRs ... var MTRRs [2/8] ... done.
(XEN) HVM164: Testing HVM environment:
(XEN) HVM164:  - REP INSB across page boundaries ... passed
(XEN) HVM164:  - GS base MSRs and SWAPGS ... passed
(XEN) HVM164: Passed 2 of 2 tests
(XEN) HVM164: Writing SMBIOS tables ...
(XEN) HVM164: Loading SeaBIOS ...
(XEN) HVM164: Creating MP tables ...
(XEN) HVM164: Loading ACPI ...
(XEN) HVM164: vm86 TSS at fc00a080
(XEN) HVM164: BIOS map:
(XEN) HVM164:  10000-100d3: Scratch space
(XEN) HVM164:  e0000-fffff: Main BIOS
(XEN) HVM164: E820 table:
(XEN) HVM164:  [00]: 00000000:00000000 - 00000000:000a0000: RAM
(XEN) HVM164:  HOLE: 00000000:000a0000 - 00000000:000e0000
(XEN) HVM164:  [01]: 00000000:000e0000 - 00000000:00100000: RESERVED
(XEN) HVM164:  [02]: 00000000:00100000 - 00000000:07800000: RAM
(XEN) HVM164:  HOLE: 00000000:07800000 - 00000000:fc000000
(XEN) HVM164:  [03]: 00000000:fc000000 - 00000001:00000000: RESERVED
(XEN) HVM164: Invoking SeaBIOS ...
(XEN) HVM164: SeaBIOS (version rel-1.7.2-18-g6ca0460-dirty-20130208_144531-cosworth)
(XEN) HVM164: 
(XEN) HVM164: Found Xen hypervisor signature at 40000000
(XEN) HVM164: xen: copy e820...
(XEN) HVM164: Ram Size=0x07800000 (0x0000000000000000 high)
(XEN) HVM164: Relocating low data from 0x000e1b60 to 0x000ef740 (size 2164)
(XEN) HVM164: Relocating init from 0x000e23d4 to 0x077e22f0 (size 56296)
(XEN) HVM164: CPU Mhz=2402
(XEN) HVM164: Found 7 PCI devices (max PCI bus is 00)
(XEN) HVM164: Allocated Xen hypercall page at 77ff000
(XEN) HVM164: Detected Xen v4.3-unstable
(XEN) HVM164: Found 2 cpu(s) max supported 2 cpu(s)
(XEN) HVM164: xen: copy BIOS tables...
(XEN) HVM164: Copying SMBIOS entry point from 0x00010010 to 0x000fdb10
(XEN) HVM164: Copying MPTABLE from 0xfc001170/fc001180 to 0x000fda10
(XEN) HVM164: Copying PIR from 0x00010030 to 0x000fd990
(XEN) HVM164: Copying ACPI RSDP from 0x000100b0 to 0x000fd960
(XEN) HVM164: Scan for VGA option rom
(XEN) HVM164: Running option rom at c000:0003
(XEN) HVM164: Turning on vga text mode console
(XEN) HVM164: SeaBIOS (version rel-1.7.2-18-g6ca0460-dirty-20130208_144531-cosworth)
(XEN) HVM164: Machine UUID 5f1a6b33-97ac-4503-b38a-5ee17030e4fd
(XEN) HVM164: /077e0000\ Start thread
(XEN) HVM164: Found 1 lpt ports
(XEN) HVM164: Found 1 serial ports
(XEN) HVM164: Searching bootorder for: /pci at i0cf8/isa at 1/fdc at 03f0/floppy at 0
(XEN) HVM164: ATA controller 1 at 1f0/3f4/c140 (irq 14 dev 9)
(XEN) HVM164: /077df000\ Start thread
(XEN) HVM164: ATA controller 2 at 170/374/c148 (irq 15 dev 9)
(XEN) HVM164: /077de000\ Start thread
(XEN) HVM164: |077df000| ata0-0: QEMU HARDDISK ATA-7 Hard-Disk (8192 MiBytes)
(XEN) HVM164: |077df000| Searching bootorder for: /pci at i0cf8/*@1,1/drive at 0/disk at 0
(XEN) HVM164: \077df000/ End thread
(XEN) HVM164: |077de000| DVD/CD [ata1-0: QEMU DVD-ROM ATAPI-4 DVD/CD]
(XEN) HVM164: |077de000| Searching bootorder for: /pci at i0cf8/*@1,1/drive at 1/disk at 0
(XEN) HVM164: \077de000/ End thread
(XEN) HVM164: |077e0000| PS2 keyboard initialized
(XEN) HVM164: \077e0000/ End thread
(XEN) HVM164: All threads complete.
(XEN) HVM164: Scan for option roms
(XEN) HVM164: Running option rom at c900:0003
(XEN) HVM164: pmm call arg1=1
(XEN) HVM164: pmm call arg1=0
(XEN) HVM164: pmm call arg1=1
(XEN) HVM164: pmm call arg1=0
(XEN) HVM164: Searching bootorder for: /pci at i0cf8/*@4
(XEN) HVM164: 
(XEN) HVM164: Press F12 for boot menu.
(XEN) HVM164: 
(XEN) HVM164: Searching bootorder for: HALT
(XEN) HVM164: drive 0x000fd8e0: PCHS=16383/16/63 translation=lba LCHS=1024/255/63 s=16777216
(XEN) HVM164: 
(XEN) HVM164: Space available for UMB: 000ca000-000ee800
(XEN) HVM164: Returned 61440 bytes of ZoneHigh
(XEN) HVM164: e820 map has 6 items:
(XEN) HVM164:   0: 0000000000000000 - 000000000009fc00 = 1 RAM
(XEN) HVM164:   1: 000000000009fc00 - 00000000000a0000 = 2 RESERVED
(XEN) HVM164:   2: 00000000000f0000 - 0000000000100000 = 2 RESERVED
(XEN) HVM164:   3: 0000000000100000 - 00000000077ff000 = 1 RAM
(XEN) HVM164:   4: 00000000077ff000 - 0000000007800000 = 2 RESERVED
(XEN) HVM164:   5: 00000000fc000000 - 0000000100000000 = 2 RESERVED
(XEN) HVM164: enter handle_19:
(XEN) HVM164:   NULL
(XEN) HVM164: Booting from ROM...
(XEN) HVM164: Booting from c900:0372
(XEN) HVM164: enter handle_12:
(XEN) HVM164:    a=dced0200  b=00000030  c=00030000  d=00090027 ds=0000 es=0000 ss=9cf2
(XEN) HVM164:   si=00002e10 di=0000b7b6 bp=00032ca2 sp=00002ca2 cs=0000 ip=7eef  f=0246
(XEN) HVM164: unimplemented handle_16XX:231:
(XEN) HVM164:    a=00000305  b=00000000  c=00000000  d=00000000 ds=3000 es=3000 ss=3000
(XEN) HVM164:   si=00000000 di=00000000 bp=00000000 sp=0000f70c cs=3000 ip=05f0  f=0003
(XEN) HVM164: unimplemented handle_15XX:338:
(XEN) HVM164:    a=0000e980  b=00000000  c=00000000  d=47534943 ds=3000 es=3000 ss=3000
(XEN) HVM164:   si=00000000 di=00000000 bp=00000000 sp=0000f70c cs=3000 ip=05f0  f=0003

-- 
Ian Campbell
Current Noise: Chthonic - Root Regeneration

Q:	How many Zen masters does it take to screw in a light bulb?
A:	None.  The Universe spins the bulb, and the Zen master stays out
	of the way.


