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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Tested-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
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The A20 setting is almost always enabled - only issue an outb() if the
A20 is actually changing. This reduces the number of outb() calls.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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SDM[*1] says that if there are CPUs with APIC ID
greater than 254, BIOS is to pass control to OS
in x2APIC mode. Use the fact that QEMU passes in
"etc/max-cpus" max possible "APIC ID + 1" to
detect need for x2APIC mode. Also instead of
CMOS_BIOS_SMP_COUNT which is limited to 256 CPUs
use a new rom file "etc/boot-cpus" that QEMU
supporting more than 256 CPUs will provide.
*1) SDM: Volume 3: EXTENDED XAPIC (X2APIC):
Initialization by System Software
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
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Move PAGE_SHIFT / virt_to_phys() to memmap.h and smp_[rw]mb() to
x86.h.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Always enable caching at start of 32bit code and always make sure the
paging flag is off. Because this alters the cr0 register, perform a
backup and restore of it when using call32().
Also, rename get/setcr0() to cr0_read/write() to more closely match
other register access functions.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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This patch implements the TCG BIOS interrupt handler 1ah. It is for
example used by trusted grub.
This patch adds an implementation of SHA1 (following NIST specs., IETF RFC 3147
and Wikipedia) for speeding up measurements of code. Trusted Grub for example
makes use of this interface and measures (calculates SHA1) of the Linux kernel
and initrd. Those files can be rather large and hunting their bytes through
the TIS interface as part of the int handler commands invoked by trusted grub
does take quite some time due to the many vmexits the interface is creating
(one per byte).
There is also a threshold for the size of data to hash (100k) below which
the TPM is used and above the internal faster SHA1 algorithm is used.
This patch for example enables trusted grub to interact with the TPM
and take additional measurements.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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If the last mode set (while not in vm86 mode) was done from a VBE mode
set call then disable the extra stack. This works under the premise
that only a modern OS would invoke the VBE mode changing facilities
and a modern OS would always call the vgabios with sufficient stack
space.
This is an ugly hack to work around a problem Windows Vista (and
possibly later Windows releases) has with the VGA BIOS using a stack
in the e-segment.
Reported-by: Richard Laager <rlaager@wiktel.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Use barrier() for memory mapped IO functions.
This fixes pvscsi driver to boot on QEMU's pvscsi controller.
Test command:
qemu -m 512 --enable-kvm -device pvscsi,id=pvscsi0
-device scsi-disk,bus=pvscsi0.0,drive=drive0
-drive id=drive0,if=none,file=ubuntu1410.img,if=none
-bios seabios/out/bios.bin
Signed-off-by: Ameya Palande <2ameya@gmail.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Although the a20 functionality was originally implemented in the ps2
controller, that is just a historical artifact. It's a core feature
of modern x86 cpus and the code is better located in the x86.h header.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Move the inb(), insb(), etc. code from ioport.h to x86.h. Move the
PORT_* definitions to their appropriate hardware files.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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