Move retry loop/sleep/wakeup in bio.c into sleeping locks

Straight replacement of B_BUSY with a sleeping lock.

x

use asm() for lock release, not a C assignment

this might fix the reported deadlock, though I can't reproduce it.

Be a bit more explicit what kind of suggestions are are interested.

Make runoff happy

Fix a few lines that runoff is complaining about that they are too long

ack xi

APIC IDs may not be consecutive and start from zero, so we cannot really use it
as a direct index into cpus. Record apicid in struct cpu and have cpunum() look
for it. Replace cpu->id with cpunum()

APIC IDs may not be consecutive and start from zero, so we cannot really use it
as a direct index into cpus. Record apicid in struct cpu and have cpunum() look
for it. Replace cpu->id with cpunum() everywhere, and replace cpu->id with cpu->apicid.
Thanks to Xi Wang.

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comment about sched() saving/restoring cpu->intena

curproc -> proc in a comment

better comment

ack

set iomb to forbid i/o instructions from user space
add to test that they indeed trap in user space
thanks to pablogventura@gmail.com and nwolovick@gmail.com

x

Remove trailing white space with:
for f in *.{h,c}; do sed -i .sed 's/[[:blank:]]*$//' $f; done
(Thanks to Nicolás Wolovick)

ack mikecat

add check for wrapping of address + size in exec()

add alignment check of virtual address to exec()

p2v -> P2V

x

Coding style (thanks to phf).

Fixed QEMU command line avoids raw image warning.

It will be for 2016