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Author SHA1 Message Date
Frans Kaashoek 61cb32aa9b Merge branch 'nogs' 2017-08-07 14:35:05 -04:00
Saarett 03b3086327 Free pgdir in setupkvm in case of mappages failure 
There is a potential memory leak when mappages() fails inside setupkvm().
A call to freevm() is added in this case so as to reclaim the lost mapping pages.
 2017-02-05 12:44:56 +02:00
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
Peter Froehlich 8d1f99637a Fix long-standing switchuvm() inconsistency. 
switchuvm() is supposed to switch the TSS and page table to the
process p it is passed. Alas, instead of using p to access the
kstack field, it used the global proc. This worked fine because
(a) most uses of switchuvm() pass proc anyway and (b) because in
the schedule, where we call switchuvm with the newly scheduled
process, we actually set the global proc before the call. But I
think it's still a bug, even if it never broke a test case. :-)
 2017-01-30 19:31:24 -05:00
Cody Cutler ffe444926e fix possible memory leak in deallocuvm 
when a zero PDE is encountered while searching for present PTEs to free,
resume searching at first entry of the next page table instead of the
current entry of the next page table.
 2016-09-26 12:34:08 -04:00
Robert Morris 4b2152cc2d curproc -> proc in a comment 2016-09-01 17:21:37 -04:00
Frans Kaashoek 37939f24c2 better comment 2016-08-26 08:46:13 -04:00
Frans Kaashoek aff0c8d5c7 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
 2016-08-26 08:20:11 -04:00
Frans Kaashoek 7894fcd217 Remove trailing white space with: 
for f in *.{h,c}; do sed -i .sed 's/[[:blank:]]*$//' $f; done
(Thanks to Nicolás Wolovick)
 2016-08-25 09:13:00 -04:00
Robert Morris a7c03bd914 p2v -> P2V 2016-08-24 13:40:06 -04:00
Robert Morris 9c65b32d9e nothing much 2016-08-11 15:41:53 -04:00
Robert Morris 858475e4df tiny clarifications to some gdt code. 2016-08-10 10:51:14 -04:00
Robert Morris 0a4a4230a3 shell nits 
fix Regehr complaint
 2016-08-08 13:06:38 -04:00
Frans Kaashoek 74c77da6f8 Nice layout for a printout of the code 2014-08-29 17:06:49 -04:00
Stephen Tu ff2783442e Correct a security bug in copyuvm() 
copyuvm() should not allow new copied pages to inherit more
permissions than the original pages.
 2013-03-04 16:16:54 -05:00
Robert Morris 792d83cad1 nits 2012-08-28 14:11:23 -04:00
Frans Kaashoek 3fb7eceea7 Runoff still complaints these lines are too long, but it is now ok on printout 2012-08-22 21:24:13 -04:00
Frans Kaashoek 4ce832ddd2 Remove unused argument to setupkvm (thanks to Peter Froehlich) 2012-08-22 20:19:37 -04:00
Robert Morris c092540e39 eliminate enter_alloc -- use kalloc for everything 2011-09-13 13:14:52 -04:00
Robert Morris 7e7cb106d0 more regular kmap[] and description 2011-09-13 12:28:45 -04:00
Austin Clements dd4438b4fe Nuke data.S, since we do have a custom linker script. 2011-09-02 14:51:55 -04:00
Austin Clements 6f3ca059f2 Oops, dropped a paren 2011-09-02 14:37:42 -04:00
Austin Clements 2eb214c9db clear_pte_u -> clearpteu 2011-09-02 14:37:04 -04:00
Austin Clements 91aa0f3296 Move copy_pte_u; fits vm.c in one less column and aligns proc.h 2011-09-02 14:35:58 -04:00
Austin Clements 9e4272c14e Cleanup comments and fit setupkvm on same page as kmap, which aligns lots of other things 2011-09-02 14:34:29 -04:00
Austin Clements 14835ec987 Style 2011-09-02 14:28:44 -04:00
Austin Clements cf7b670293 Make mappages fit on the page 2011-09-02 14:11:16 -04:00
Austin Clements 052e18485d Skip missing page directories in deallocuvm 
Previously, deallocuvm scanned from 0 to KERNBASE in one page
increments, which had a noticable effect on boot time.  Now it skips
over missing page directories.
 2011-09-01 21:29:09 -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
Robert Morris 62e3b8a92c Merge branch 'master' of git+ssh://amsterdam.csail.mit.edu/home/am0/6.828/xv6 
Conflicts:
	vm.c
 2011-09-01 12:03:49 -04:00
Robert Morris 5a23692444 fix usertests to correctly test what happens when you call 
exec() with arguments that don't fit on a single page.
 2011-09-01 12:02:49 -04:00
Frans Kaashoek e25b74ca80 Fix layout issues for printed version 2011-09-01 10:25:20 -04:00
Austin Clements a7061b4f97 Style nits; indentation and tabs 2011-08-29 16:12:01 -04:00
Frans Kaashoek 6f2327580f Eliminate USERTOP; no use for it. 2011-08-24 10:24:40 -04:00
Frans Kaashoek 5f069dcf2f Switch back to #define for PHYSTOP. Using the E820 to retrieve the memory map is too complicated (must be done in 16-bit real-mode, probably enlarged bootblock beyond 512 bytes, and a #define requires less explanation). 2011-08-16 20:23:17 -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 d9818bdd7d Make Austin happier 
2011
 2011-08-15 20:21:14 -04:00
Frans Kaashoek a4b213cf49 Avoid "boot" in xv6 2011-08-15 20:11:13 -04:00
Frans Kaashoek bd71a45046 Make AP processors boot using bootpgdir 
Remove device mapping from bootpgdir
Remove unnecessary vmenable
Set CPUS back to 2 in Makefile
Passes all usertests
 2011-08-11 12:25:10 -04:00
Frans Kaashoek 8a9933a200 Tiny bit of cleanup 2011-08-09 21:56:43 -04:00
Frans Kaashoek 5460667c9c x 2011-08-09 21:49:13 -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 6479766334 Adjust sbrk test for large user address spaces 
All tests pass
 2011-08-07 23:03:48 -04:00
Frans Kaashoek 547c28fc1e Don't map IO space in the user part of the address space 
Passes all tests now (but need to update usertests to allow for more than 640k)
 2011-07-31 21:27:02 -04:00
Frans Kaashoek 9aa0337dc1 Map kernel high 
Very important to give qemu memory through PHYSTOP :(
 2011-07-29 07:31:27 -04:00
Russ Cox cf4b1ad90b xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
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