Fixes and workarounds about PCI on qemu

[benpigchu]

This PR include lots of bug fix to PCI, so it now works (partially) on qemu

• device tree outputted by dm dump list PCI devices correctly
• lsblk outputs the blocks in the AHCI disk correctly
• gpt init gpt dump gpt add gpt edit works, new partition is created, the fuchsia-data type is added successfully. (a kernal panic caused by user space page fault occurs after the gpt edit)
• mkfs with minfs completes without errors. However if we reboot the machine after that, the fshost will try to mount the filesystem on the disk as minfs, but it will fail since the magic bytes in the journal superblock is not correct.

We used commands from #53 for testing.

Also, the PR added proc name and thread name to the output when the kernal panic on a unhandled user exception. And as a workaround to a page fault caused by a message sent from virtual-console to sysmem driver, we disabled virtual-console in kernal cmdline.

The shell will be usable after this on debug version of zCore on qemu.

[coveralls]

Pull Request Test Coverage Report for Build 134942584

• 0 of 41 (0.0%) changed or added relevant lines in 8 files are covered.
• 16 unchanged lines in 6 files lost coverage.
• Overall coverage decreased (-0.06%) to 20.13%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
zircon-object/src/dev/pci/mod.rs	0	1	0.0%
zircon-object/src/dev/pci/bus.rs	0	2	0.0%
zircon-syscall/src/object.rs	0	2	0.0%
zircon-syscall/src/pci.rs	0	2	0.0%
zircon-object/src/dev/pci/caps.rs	0	5	0.0%
zircon-object/src/dev/pci/nodes.rs	0	5	0.0%
kernel-hal-bare/src/arch/x86_64/interrupt.rs	0	8	0.0%
zircon-object/src/dev/pci/config.rs	0	16	0.0%

Files with Coverage Reduction	New Missed Lines	%
kernel-hal-bare/src/arch/x86_64/interrupt.rs	1	0%
zircon-object/src/dev/pci/bus.rs	1	0%
zircon-object/src/dev/pci/nodes.rs	1	0%
zircon-object/src/dev/pci/config.rs	2	0%
../../../../../usr/share/rust/.cargo/registry/src/github.com-1ecc6299db9ec823/numeric-enum-macro-0.2.0/src/lib.rs	4	0%
zircon-object/src/dev/pci/mod.rs	7	0%

Totals
Change from base Build 133046386:	-0.06%
Covered Lines:	2040
Relevant Lines:	10134

---

💛 - Coveralls

[wangrunji0408]

Orz!

[coveralls]

Pull Request Test Coverage Report for Build 134940005

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 41 (0.0%) changed or added relevant lines in 8 files are covered.
• 46 unchanged lines in 6 files lost coverage.
• Overall coverage decreased (-0.06%) to 20.132%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
zircon-object/src/dev/pci/mod.rs	0	1	0.0%
zircon-object/src/dev/pci/bus.rs	0	2	0.0%
zircon-syscall/src/object.rs	0	2	0.0%
zircon-syscall/src/pci.rs	0	2	0.0%
zircon-object/src/dev/pci/caps.rs	0	5	0.0%
zircon-object/src/dev/pci/nodes.rs	0	5	0.0%
kernel-hal-bare/src/arch/x86_64/interrupt.rs	0	8	0.0%
zircon-object/src/dev/pci/config.rs	0	16	0.0%

Files with Coverage Reduction	New Missed Lines	%
zircon-object/src/dev/pci/bus.rs	1	0.0%
zircon-object/src/dev/pci/nodes.rs	1	0.0%
zircon-object/src/dev/pci/config.rs	2	0.0%
../../../../../usr/share/rust/.cargo/registry/src/github.com-1ecc6299db9ec823/numeric-enum-macro-0.2.0/src/lib.rs	4	0.0%
zircon-object/src/dev/pci/mod.rs	7	0.0%
kernel-hal-bare/src/arch/x86_64/interrupt.rs	31	0.0%

Totals
Change from base Build 133046386:	-0.06%
Covered Lines:	2040
Relevant Lines:	10133

---

💛 - Coveralls