more trivial cleanup

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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copyout() copies data to a va in a pagetable, for exec() &c
usertest that passes too many arguments, break exec

change some comments, maybe more informative
delete most comments from bootother.S (since copy of bootasm.S)
ksegment() -> seginit()
move more stuff from main() to mainc()

Consistent style in defs.h

Simplify allocuvm/deallocuvm to operate in a contiguous memory model. This makes their interface match up better with proc->sz and also simplifies the callers (it even gets the main body of exec on

Simplify allocuvm/deallocuvm to operate in a contiguous memory model. This makes their interface match up better with proc->sz and also simplifies the callers (it even gets the main body of exec on one page).

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Simplify inituvm and userinit by assuming initcode fits on a page

Oops. Broke the build when I rearranged proc.c

no more pminit, or ELF header at 0x10000
kinit() knows about end and PHYSTOP
map all of kernel read/write (rather than r/o instructions)
thanks, austin

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

xx

uptime() sys call for benchmarking
increase PHYSTOP

allow sbrk(-x) to de-allocate user memory

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

move jkstack to main.c
replace jstack with asm()s

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

kill TLB shoot down code

some cleanup

Checkpoint page-table version for SMP
Includes code for TLB shootdown (which actually seems unnecessary for xv6)

nits

Initial version of single-cpu xv6 with page tables

Remove memcpy prototypes at Russ' request to prevent code from calling
memcpy directly.

Provide memcpy for compatibility with older versions of gcc

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