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 <[email protected]>
Signed-off-by: Kevin O'Connor <[email protected]>
(cherry picked from commit bc82fa4)

If there are extra primary root buses, scanning the bus's 0
subtree is not enough. Scan all the range.

Signed-off-by: Marcel Apfelbaum <[email protected]>
Signed-off-by: Gerd Hoffmann <[email protected]>
(cherry picked from commit 5cc7eec)

For resource sizing and mapping purposes treat devices on extra root
buses as if they are on the default root bus (bus 0).

Signed-off-by: Kevin O'Connor <[email protected]>
Signed-off-by: Marcel Apfelbaum <[email protected]>
Signed-off-by: Gerd Hoffmann <[email protected]>
(cherry picked from commit 0fe4c9e)

In 0673b78 the QEMU SMP init code was changed to run in 32bit mode.
Unfortunately, the transition32 assembler function is not
multi-processor safe, because it modifies the global RTC index
register.  This race condition led to sporadic failures when emulating
machines with a large number of processors.

This patch changes the entry_smp code to use a variant of transition32
that does not touch the RTC registers.

Signed-off-by: Kevin O'Connor <[email protected]>
(cherry picked from commit 5ae3dd6)

Add a kconfig build option (CONFIG_VGA_FIXUP_ASM) to allow users to
build the vgabios without the complex assembler fixups that work
around emulator bugs.

Signed-off-by: Kevin O'Connor <[email protected]>
(cherry picked from commit 799b20b)

Emulate the "leal" instruction so that the vgabios can run on older
versions of x86emu.  (This removes the previous "leal" trap.)

Signed-off-by: Kevin O'Connor <[email protected]>
(cherry picked from commit 0b2165d)

At least AHCI on Intel on some machines claim to support only 6 ports
while in fact higher port numbers are present and work.
This is needed to access CD-ROM on PackardBell MS2290.
Both GRUB and Linux have a similar workaround.

Signed-off-by: Vladimir Serbinenko <[email protected]>
(cherry picked from commit 40dfc0e)

Add a build option to explicitly set the version information compiled
into the seabios and seavgabios binaries.  This may assist in
reproducible builds or to better link builds to distribution packages.
If the new "VERSION=" parameter is not provided then the default build
version remains unchanged.

Signed-off-by: Kevin O'Connor <[email protected]>
(cherry picked from commit 624e812)

Unlike planned earlier virtio-vga will be compatible with
the qemu stdvga, with the framebuffer in bar 0.  Drop the
virtio-vga chunk, update comment accordingly.

Signed-off-by: Gerd Hoffmann <[email protected]>
(cherry picked from commit 87f848e)

Bits 16-31 of the SMM revision ID are feature bits.  We only need to
check that SMBASE relocation is supported, but do not care about other
features.  In particular, this allows the SMM I/O instruction restart
feature to be present.

Signed-off-by: Paolo Bonzini <[email protected]>
(cherry picked from commit 92f9b91)

Add the dependency to CONFIG_VGA_FIXUP_ASM so the menu option only
appears when appropriate.

Signed-off-by: Kevin O'Connor <[email protected]>
(cherry picked from commit f24eb2f)

When restoring a saved state, make sure to remove any flags from the
video mode prior to searching for that mode.

Signed-off-by: Kevin O'Connor <[email protected]>