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Author SHA1 Message Date
Frans Kaashoek c9fa90f7e5 A tiny bit of clean up (e.g., move code searching cpu array from lapic.c into 
mycpu() in proc.c.
 2017-02-01 20:36:41 -05:00
Frans Kaashoek ed396c068b 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.
 2017-02-01 18:04:13 -05:00
Frans Kaashoek fbb4c09444 Read curproc from cpu structure, but be careful because after a schedule event 
myproc() points to a different thread.

   myproc();
   sched();
   myproc();  // this proc maybe different than the one before sched

Thus, in a function that operates on one thread better to retrieve the
current process once at the start of the function.
 2017-01-31 20:21:14 -05:00
Frans Kaashoek abf847a083 Start of an experiment to remove the use of gs for cpu local variables. 2017-01-31 17:47:16 -05:00
Frans Kaashoek c383612a7d Thanks to Wolfgang Keller <nubok@users.noreply.github.com> 2017-01-30 20:07:42 -05:00
Frans Kaashoek 2adb7c21dc Move retry loop/sleep/wakeup in bio.c into sleeping locks 2016-09-11 20:17:22 -04:00
Frans Kaashoek 6670d3b5e0 Straight replacement of B_BUSY with a sleeping lock. 2016-09-11 17:24:04 -04:00
Peter H. Froehlich 2c60b7f31f Removed useless function and prototypes. 2016-08-18 11:09:04 -04:00
Frans Kaashoek 8320d61be5 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.
 2015-06-27 12:39:13 -04:00
Cody Cutler aae4e7490f cmosgetdate() for system-call homework 
the day of reckoning has come for the debug port "Shutdown" hack.

instead of mucking with ACPI or using a new hack, the student will now write
sys_date() using the cmosgetdate() helper.
 2014-09-12 18:09:51 -04:00
Robert Morris 71453f72f2 a start at concurrent FS system calls 2014-08-27 17:15:30 -04:00
Frans Kaashoek 432acbaf9e Merge branch 'master' of git+ssh://amsterdam.csail.mit.edu/home/am0/6.828/xv6 2012-08-22 20:20:17 -04:00
Frans Kaashoek 4ce832ddd2 Remove unused argument to setupkvm (thanks to Peter Froehlich) 2012-08-22 20:19:37 -04:00
Frans Kaashoek 70c555574a Remove unused argument from lapicinit (thanks to Peter Froehlich) 2012-08-22 20:13:43 -04:00
Austin Clements 9d59eb0151 Make fetchint and fetchstr use proc instead of taking a struct proc 
Previously, these were inconsistent: they used their struct proc
argument for bounds checking, but always copied the argument from the
current address space (and hence the current process).  Drop the
struct proc argument and always use the current proc.

Suggested by Carmi Merimovich.
 2012-02-17 23:20:13 -05:00
Robert Morris c092540e39 eliminate enter_alloc -- use kalloc for everything 2011-09-13 13:14:52 -04:00
Austin Clements 2eb214c9db clear_pte_u -> clearpteu 2011-09-02 14:37:04 -04:00
Robert Morris 371ab7fa96 inaccessible page under the user stack page, to help exec deal w/ too-large args 2011-09-01 13:25:34 -04:00
Frans Kaashoek 1ddfbbb194 Revert "Introduce and use sleeplocks instead of BUSY flags" 
My changes have a race with re-used bufs and the code doesn't seem to get shorter
Keep the changes that fixed ip->off race

This reverts commit 3a5fa7ed90.

Conflicts:

	defs.h
	file.c
	file.h
 2011-08-29 17:18:40 -04:00
Austin Clements a7061b4f97 Style nits; indentation and tabs 2011-08-29 16:12:01 -04:00
Frans Kaashoek 3a5fa7ed90 Introduce and use sleeplocks instead of BUSY flags 
Remove I_BUSY, B_BUSY, and intrans defs and usages
One spinlock per buf to avoid ugly loop in bget
fix race in filewrite (don't update f->off after releasing lock)
 2011-08-26 10:08:29 -04:00
Frans Kaashoek c3dcf47966 Clean up memlayout.h 
Get rid of last instances of linear address and "la"
Get ready for detecting physical memory dynamically
 2011-08-16 15:47:22 -04:00
Frans Kaashoek a4b213cf49 Avoid "boot" in xv6 2011-08-15 20:11:13 -04:00
Frans Kaashoek 66ba8079c7 Use static page table for boot, mapping first 4Mbyte; no more segment trick 
Allocate proper kernel page table immediately in main using boot allocator
Remove pginit
Simplify address space layout a tiny bit
More to come (e.g., superpages to simplify static table)
 2011-08-09 21:37:35 -04:00
Frans Kaashoek 9aa0337dc1 Map kernel high 
Very important to give qemu memory through PHYSTOP :(
 2011-07-29 07:31:27 -04:00
Frans Kaashoek 13a96baefc Dirt simple logging 
Passes usertests and stressfs
Seems to recover correctly in a number of simple cases
 2011-07-27 20:35:46 -04:00
Russ Cox 417c37115e more trivial cleanup 2011-01-11 13:51:40 -05:00
Russ Cox 1a81e38b17 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.
 2011-01-11 13:01:13 -05:00
Robert Morris 4655d42e3b copyout() copies data to a va in a pagetable, for exec() &c 
usertest that passes too many arguments, break exec
 2010-09-27 16:14:33 -04:00
Robert Morris faad047ab2 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()
 2010-09-13 15:34:44 -04:00
Austin Clements 588644f472 Consistent style in defs.h 2010-09-02 19:01:25 -04:00
Austin Clements 79cd8b3eed 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). 2010-09-02 18:28:36 -04:00
Austin Clements f53e6110be Simplify inituvm and userinit by assuming initcode fits on a page 2010-09-02 15:42:25 -04:00
Austin Clements c7c21467c3 Oops. Broke the build when I rearranged proc.c 2010-09-02 14:30:06 -04:00
Robert Morris 8d774afb2d 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
 2010-08-31 15:39:25 -04:00
Robert Morris 7d7dc9331b kalloc/kfree now only a page at a time 
do not keep sorted contiguous free list
 2010-08-31 12:54:47 -04:00
Robert Morris ac090078c6 xx 2010-08-30 10:13:49 -04:00
Robert Morris 789b508d53 uptime() sys call for benchmarking 
increase PHYSTOP
 2010-08-11 14:34:45 -04:00
Robert Morris 83d2db91f7 allow sbrk(-x) to de-allocate user memory 2010-08-10 17:08:41 -04:00
Robert Morris c4cc10da7e fix corner cases in exec of ELF 
put an invalid page below the stack
have fork() handle invalid pages
 2010-08-06 11:12:18 -04:00
Robert Morris c99599784e remove some unused vm #defines 
fix corner cases with alignment when mapping kernel ELF file
 2010-08-05 16:00:59 -04:00
Robert Morris 2cf6b32d4d move jkstack to main.c 
replace jstack with asm()s
 2010-08-05 14:15:03 -04:00
Robert Morris eb18645f17 fix allocuvm() to handle sbrk() with non-page-granularity argument 
(maybe this never worked, but it works now)
 2010-08-05 12:10:54 -04:00
Frans Kaashoek b738a4f1a2 kill TLB shoot down code 2010-07-28 14:38:05 -04:00
Frans Kaashoek 30f5bf0548 some cleanup 2010-07-25 20:30:21 -04:00
Frans Kaashoek 4714c20521 Checkpoint page-table version for SMP 
Includes code for TLB shootdown (which actually seems unnecessary for xv6)
 2010-07-23 07:41:13 -04:00
Frans Kaashoek 74c82bc158 nits 2010-07-02 17:45:37 -04:00
Frans Kaashoek 40889627ba Initial version of single-cpu xv6 with page tables 2010-07-02 14:51:53 -04:00
Austin Clements 2c536bff67 Remove memcpy prototypes at Russ' request to prevent code from calling 
memcpy directly.
 2009-10-07 13:06:55 -04:00
Austin Clements 6639ce56d9 Provide memcpy for compatibility with older versions of gcc 2009-10-07 12:05:56 -04:00