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162 commits

Author SHA1 Message Date
Frans Kaashoek c64aa44d7b kvmmake() makes a complete kernel page table, matching Figure 3.3 2020-10-14 20:03:14 -04:00
Robert Morris 6c16759503 more explicable scratch area size for machine-mode timer interrupts 2020-10-05 15:28:01 -04:00
Frans Kaashoek 0c55849d28 Don't map the CLINT, since it never used in the kernel in supervisor mode 2020-10-05 09:18:23 -04:00
Robert Morris a9b3dd457c eliminate virtio DMA into kernel stacks. 2020-10-05 06:59:33 -04:00
Robert Morris 271d89ae30 improve virtio_disk comments; bring it closer to wording in the spec 2020-10-05 06:26:58 -04:00
Robert Morris da002a48fb don't unpin if recovering -- the resulting negative refcnt suppresses next unpin 2020-10-04 13:29:04 -04:00
Robert Morris 792d60e912 avoid deadlock by disk intr acking interrupt first, then processing ring 2020-10-04 09:21:03 -04:00
Matt Harvey b9359c3533 Corrects order of UART RX/TX interrupt enable bits 
(per http://byterunner.com/16550.html and manually tested in qemu bare metal echo)
 2020-10-03 16:35:47 -04:00
Fumiya Shigemitsu b96547403d Fix minor typos 2020-10-03 16:35:45 -04:00
Frans Kaashoek 1c4b582fc7 Clarify CLINT and PLIC acronym 2020-10-03 10:21:04 -04:00
Frans Kaashoek 05074badc4 When either_copyin/out fails, return an error from write/read 
Add a test to check that read/write return an error
 2020-09-24 13:18:54 -04:00
Robert Morris ffb2ee074a move panicked check to uart.c 2020-08-28 05:51:48 -04:00
Robert Morris db067d24da suppress write() output after panic() 2020-08-28 05:44:09 -04:00
Frans Kaashoek efaa7b8e2a Adjust a few prototypes to be explicit that they don't take arguments 2020-08-21 10:56:27 -04:00
Robert Morris aefa2697d7 usertest for exec() out of memory recovery 
and fix a few exec() bugs
 2020-08-19 12:35:14 -04:00
Robert Morris b154cf091c x 2020-08-15 05:46:32 -04:00
Robert Morris 4a87a0ae8b fix a bug in the out-of-memory handling code in exec 2020-08-13 14:10:58 -04:00
Robert Morris adee82c3e7 handle another out-of-memory in fork(). the policy here is not consistent, 
since other calls (e.g. exec()) panic on out of memory.
 2020-08-13 10:22:07 -04:00
Robert Morris 4c22c54480 try to handle a few of the possible out-of-memory errors in fork() 2020-08-13 09:19:23 -04:00
Robert Morris 70c6fe861e modify uvmunmap() to be in aligned pages 
fix a bug in fork() recovering from out of memory
 2020-08-13 08:46:28 -04:00
Robert Morris e1a2cd59fa Merge branch 'riscv' of g.csail.mit.edu:xv6-dev into riscv 2020-08-13 08:05:13 -04:00
Robert Morris d32eac366f pa isn't needed in the uvmunmap() loop 2020-08-13 08:04:56 -04:00
Frans Kaashoek 2db95f08b1 Typo (thanks yt <jaichenhengjie@qq.com>) 2020-08-10 16:27:26 -04:00
Asami Doi c24844714b update initcode to avoid using the compressed extension 2020-08-10 13:59:40 -04:00
Takahiro 9eff4b0871 Write interrupt ack register in virtio_disk_intr() 2020-08-10 13:59:40 -04:00
Jonathan Kimmitt b557e7c32e Update ramdisk.c 
The qemu syntax for a ram disk was documented incorrectly. The documented syntax is here:
https://qemu.weilnetz.de/doc/qemu-doc.html
 2020-08-10 13:59:40 -04:00
Fumiya Shigemitsu ffcb883adf Fix minor typos 2020-08-10 13:59:38 -04:00
Robert Morris 354adfdafc streamline copyin/copyout code in usertests 
fix bugs in read/write return values when there's an error
 2020-08-07 15:06:43 -04:00
Robert Morris e4b9346679 Merge branch 'riscv' of g.csail.mit.edu:xv6-dev into riscv 2020-08-07 05:33:23 -04:00
Robert Morris 8b9b799937 modify each page in usertests countfree() 
get rid of static for walk() and freewalk()
 2020-08-07 05:32:48 -04:00
Frans Kaashoek 6c3099d314 Change tf -> trapframe in a few comments 2020-08-06 20:31:19 -04:00
Robert Morris 050a69610a defines for UART register bits 2020-07-23 06:27:20 -04:00
Robert Morris db0f092ae4 fix printf() in interrupts 2020-07-22 10:31:46 -04:00
Robert Morris 823864099d interrupt-driven uart output, hopefully a nice example for teaching. 2020-07-20 06:59:26 -04:00
Robert Morris 3b053f5d58 cpu->scheduler -> cpu->context to reduce confusion 2020-07-17 16:40:57 -04:00
Robert Morris d6dad42aaf rename p->tf to p->trapframe, for consistency with p->context 2020-07-17 16:29:52 -04:00
Robert Morris f3979b7212 make "echo hello > x" truncate file x. 2020-07-16 11:38:08 -04:00
Robert Morris 028af27646 mention LRU list a bit more in comments. 2019-10-29 04:32:55 -04:00
Robert Morris e7ffb74ad1 fix a potential memory leak 2019-10-27 13:36:46 -04:00
Robert Morris d9160fb4b9 nits 2019-10-27 08:03:19 -04:00
Anish Athalye f2ab0eb644 Clean up linker script 
This patch does the following:

- Add .text.* to the .text section in the output
- Add an assertion that the trampoline does not overflow a page
- Add the .rodata section
- Make .sdata and .sdata.* (which is for small data) be absorbed into
  the .data section, because we don't need to distinguish between them;
  this prevents .sdata from appearing in the output
- Make the analogous change for .srodata and .sbss
- Make all the data sections 16-byte aligned

This patch also updates the .editorconfig for *.ld files.
 2019-10-21 22:27:18 -04:00
Robert Morris 2821d43cc9 nits 2019-10-16 12:27:08 -04:00
Robert Morris 56583b1402 updated alarmtest 2019-10-03 15:02:19 -04:00
Robert Morris deaff5d8a6 no buf->qnext 2019-09-24 14:41:51 -04:00
Xi Wang 9ead904afe fix major validation 
fileread/filewrite should validate major to avoid buffer overflows
or bogus function pointers.
 2019-09-23 20:01:56 -04:00
Robert Morris 37df68e5de story is more complex than I thought. 2019-09-23 07:24:41 -04:00
Robert Morris d175beadf5 bug fix: reparent() sometimes deadlocked 
bug fix: exit() sometimes released a different parent lock than it acquired
usertests
 2019-09-23 06:50:25 -04:00
Robert Morris d940fd122d don't leak memory if exec() arguments are invalid. 2019-09-21 04:54:25 -04:00
Robert Morris 7c7ed20822 don't leak a file system block if the buf argument to write is invalid 
and a usertest
 2019-09-20 13:09:26 -04:00
Robert Morris e1a37303c8 yet another sbrk() bug fix, and usertest 2019-09-20 12:13:57 -04:00