mboxd: Add backend DBus interface and commandline options

Also implement a backend commandline option to mboxctl: `mboxctl
--backend ...`, to allow easy run-time switching of the backend from the
co

mboxd: Add backend DBus interface and commandline options

Also implement a backend commandline option to mboxctl: `mboxctl
--backend ...`, to allow easy run-time switching of the backend from the
commandline.

Switching between VPNOR and file backends via mboxctl was tested on
Witherspoon, and MTD and file backends on Romulus.

Change-Id: Iaf0e27ecf1d5cdd9e3a31729fb179096bbc37408
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

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mboxd: Add a backend abstraction layer to mboxd.

Introduce a backend abstraction, enabling multiple implementations to be
compiled in at once. This change formally abstracts the two existing
backend

mboxd: Add a backend abstraction layer to mboxd.

Introduce a backend abstraction, enabling multiple implementations to be
compiled in at once. This change formally abstracts the two existing
backends, mtd and vpnor.

With the backend abstraction in place, subsequent backends are easier to
implement.

This change is based of Evan's work and he retains authorship credit. I
(AJ) have reworked the patch to pass the vpnor tests, refactored some
parts to enable broader use of const structures and others to clarify
the initialisation sequences.

Due to the existing lack of abstraction the patch has unfortunately
wide-ranging impacts. I've whittled it down as much as I consider
reasonable.

Change-Id: I29984a36dae4ea86ec00b853d2a756f0b9afb3ec
Signed-off-by: Evan Lojewski <github@meklort.com>
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

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flash: Introduce flash_validate()

Clean up the protocol_negotiate_version() mess. The existing approach
came about due to viewing the vpnor implementation as an edge case in
its own right. The code

flash: Introduce flash_validate()

Clean up the protocol_negotiate_version() mess. The existing approach
came about due to viewing the vpnor implementation as an edge case in
its own right. The code becomes much neater if we consider all backends
as equal and afford them the callbacks necessary for correct behaviour.

Change-Id: Ifaeee9da459818cf22b2f137ddc5b8d0356b9be9
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

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test/flash_copy: Configure MTD device to avoid undefined behaviour

Otherwise we observe invalid memory accesses due to uninitialised
variables.

Change-Id: I8b9063ccc9a25b225a562ebe120f2a99a28788ca

test/flash_copy: Configure MTD device to avoid undefined behaviour

Otherwise we observe invalid memory accesses due to uninitialised
variables.

Change-Id: I8b9063ccc9a25b225a562ebe120f2a99a28788ca
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

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test: Add windows_equally_evictable

Tests for the condition where the minimum age is less than any window's
current age, in which case we can get a NULL dereference if the
windows_reset_all() implem

test: Add windows_equally_evictable

Tests for the condition where the minimum age is less than any window's
current age, in which case we can get a NULL dereference if the
windows_reset_all() implementation is broken.

windows.c:409:23: runtime error: member access within null pointer of type 'struct window_context'
ASAN:DEADLYSIGNAL
=================================================================
==31400==ERROR: AddressSanitizer: SEGV on unknown address 0x00000004 (pc 0x0002b658 bp 0x74c00270 sp 0x7eb7c678 T0)
==31400==The signal is caused by a WRITE memory access.
==31400==Hint: address points to the zero page.
#0 0x2b657 in window_reset windows.c:410
#1 0x2cc9b in windows_create_map windows.c:572
#2 0x1f3f3 in protocol_v1_create_window protocol.c:167
#3 0x2121b in protocol_v2_create_window protocol.c:417
#4 0x24cd7f in generic_vpnor_create_window vpnor/protocol.cpp:51
#5 0x24d053 in protocol_v2_vpnor_create_window vpnor/protocol.cpp:63
#6 0x2663b in mbox_handle_create_window transport_mbox.c:282
#7 0x276db in handle_mbox_req transport_mbox.c:568
#8 0x276db in transport_mbox_dispatch transport_mbox.c:649
#9 0x17fcb in poll_loop mboxd.c:185
#10 0x17fcb in main mboxd.c:423
#11 0x46b68517 in __libc_start_main (/lib/libc.so.6+0x46b68517)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV windows.c:410 in window_reset
==31400==ABORTING

Change-Id: I8161e2ea17953e196d4bb3ca90d19e44ec10c86d
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

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vpnor: Hijack protocol rather than transport

By hijacking the transport the changes in behaviour were limited to the
mailbox interface. Now that we have a DBus interface as well this would
lead to i

vpnor: Hijack protocol rather than transport

By hijacking the transport the changes in behaviour were limited to the
mailbox interface. Now that we have a DBus interface as well this would
lead to inconsistent behaviour dependent on the transport.

Instead of hooking the transport, push the hook down to the protocol
level where we will achieve consistent behaviour across all transports.

Change-Id: I437866a6dbda107149336c15a00ee1aa058f5875
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

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protocol: Add get_info

Change-Id: Ie3338714813bb65f5d37fcd046dd5bebc0ba21f0
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

mboxd: Rename mboxd_msg to transport_mbox

Change-Id: I0f4e206648c02a98fa938a7e582470c8d90904f1
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

mboxd: Rename windows files

Change-Id: I44e110906fd0f751f8f34b175f971e65896a7301
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

mboxd: Rename lpc source files

Change-Id: I289618c90b2df8911e362397b7eab99403c86c05
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

flash: Rename write_flash to flash_write

Change-Id: I4b41aac597299c93369d8998b03a7d3e2a128742
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

flash: Rename erase_flash to flash_erase

Change-Id: I417319aadb2fdbfa2d688bb26b5515d2f9265994
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

flash: Rename copy_flash to flash_copy

Change-Id: If449889fca3370e25a65719d2f5c5ec90258d633
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

mboxd: Rename flash files

Change-Id: Icfe9d61775a198c5a0f8227bf5d6c4b7f11aeec3
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

tests: Ensure we don't disable asserts

Change-Id: Ieede7bc3c7b9d7dadc48a41b54dbe6c2b474c555
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

vpnor: Isolate relevant code in vpnor directory

This is prepatory work for introducing more vpnor-specific behaviours to
window handling. We will be introducing more objects to link, in order
to hoo

vpnor: Isolate relevant code in vpnor directory

This is prepatory work for introducing more vpnor-specific behaviours to
window handling. We will be introducing more objects to link, in order
to hook some of the window command handlers.

This change takes the opportunity to revert back to the upstream names
for some of the original C files.

Change-Id: I6b67ae466a2695054035e65ba752881be9c32d1a
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

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test: Move related tests to vpnor directory

Change-Id: I5fe7f625ad642cef17fe53bd244dcde8fd99f3ad
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

test: Move tests to a separate Makefile fragment

Change-Id: I46d5b165ed668ace67ae237b16d65a24586dd87d
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>