Imbus/xv6-riscv-kernel
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74 commits

Author SHA1 Message Date
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
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
a9183883b8 map kernel instructions r/o 2010-09-20 06:00:22 -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
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
9a4670a138 Comment inituvm and loaduvm 2010-09-02 16:39:55 -04:00
Austin Clements
93a1e4cb07 Fix comment capitalization 2010-09-02 16:36:38 -04:00