thanks eyalz800

fix runoff complaints about pagination and long lines

Commit to running on an SMP (perhaps with only 1 core). Remove most code
from picirq.c and remove timer.c completely. Update runoff.list.

Eliminate code for gs trick to track per-cpu state. We rely on lapiccpunum()
to find a per-cpu id with which we locate a cpu's cpu struct.

Start of an experiment to remove the use of gs for cpu local variables.

Make runoff happy

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

p2v -> P2V

main comments

more comments in entryother.S

Pick up where i left off in april:
- move log into metadata part of disk, so that marking
that the log's blocks are in use falls out for free
- superblock describes the whole disk (sizes and offets)

Pick up where i left off in april:
- move log into metadata part of disk, so that marking
that the log's blocks are in use falls out for free
- superblock describes the whole disk (sizes and offets)
- sizes and offsets are computed in one place (mkfs) and
the rest of the code refers to the superblock for these values,
instead of recomputing them.

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Nice layout for a printout of the code

Remove unused argument from lapicinit (thanks to Peter Froehlich)

Use | instead of + for entrypgdir. Linker doesn't get in our way here.

eliminate enter_alloc -- use kalloc for everything

Fix layout issues for printed version

enterpgdir -> entrypgdir

Style nits; indentation and tabs

Remove sys_init syscall
Invoke initlog from forkret on first user process

Avoid "boot" in xv6

Use 4Mbyte pages during boot

Separate more clearly bootloader from xv6 by renaming multiboot.S to entry.S etc.
Maybe the string boot shouldn't appear in xv6 code?

Oops

Some comments