Delete a patch
Adjust typesetting of code

thanks mtasm

Remove unused flags (thanks Wolfgang Keller)

fix runoff complaints about pagination and long lines

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.

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

tiny clarifications to some gdt code.

Correct a security bug in copyuvm()

copyuvm() should not allow new copied pages to inherit more
permissions than the original pages.

Fix layout issues for printed version

Style nits; indentation and tabs

Clean up memlayout.h
Get rid of last instances of linear address and "la"
Get ready for detecting physical memory dynamically

Use 4Mbyte pages during boot

One definition of several macros and constants

Map kernel high
Very important to give qemu memory through PHYSTOP :(

make new code like old code

Variable declarations at top of function,
separate from initialization.

Use == 0 instead of ! for checking pointers.

Consistent spacing around {, *, casts.

Declare 0-p

make new code like old code

Variable declarations at top of function,
separate from initialization.

Use == 0 instead of ! for checking pointers.

Consistent spacing around {, *, casts.

Declare 0-parameter functions as (void) not ().

Integer valued functions return -1 on failure, 0 on success.

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Page breaking of mmu.h

Start PDE defs on new page

kalloc/kfree now only a page at a time
do not keep sorted contiguous free list

fix corner cases in exec of ELF
put an invalid page below the stack
have fork() handle invalid pages

remove some unused vm #defines
fix corner cases with alignment when mapping kernel ELF file

fix allocuvm() to handle sbrk() with non-page-granularity argument
(maybe this never worked, but it works now)

some cleanup

Initial version of single-cpu xv6 with page tables

assorted fixes:
* rename c/cp to cpu/proc
* rename cpu.context to cpu.scheduler
* fix some comments
* formatting for printout

mmu.h: unused SEG_NULL