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205 commits

Author SHA1 Message Date
Frans Kaashoek 6750608824 When either_copyin/out fails, return an error from write/read 
Add a test to check that read/write return an error
 2020-10-03 16:36:20 -04:00
Matt Harvey 6781ac0036
Corrects order of UART RX/TX interrupt enable bits 
(per http://byterunner.com/16550.html and manually tested in qemu bare metal echo)
 2020-09-14 14:49:57 -07:00
Robert Morris 490f91ab53 move panicked check to uart.c 2020-08-28 09:00:41 -04:00
Robert Morris 748809e1b3 suppress write() output after panic() 2020-08-28 09:00:41 -04:00
Frans Kaashoek 0bb2533f73 Adjust a few prototypes to be explicit that they don't take arguments 2020-08-21 11:00:45 -04:00
Robert Morris 5860dcd07d usertest for exec() out of memory recovery 
and fix a few exec() bugs
 2020-08-21 11:00:45 -04:00
Robert Morris 95dad4c061 x 2020-08-17 08:18:23 -04:00
Robert Morris f2ec6777bd fix a bug in the out-of-memory handling code in exec 2020-08-17 08:18:23 -04:00
Robert Morris 8dc71a257d handle another out-of-memory in fork(). the policy here is not consistent, 
since other calls (e.g. exec()) panic on out of memory.
 2020-08-17 08:18:23 -04:00
Robert Morris bc51626aab try to handle a few of the possible out-of-memory errors in fork() 2020-08-17 08:18:23 -04:00
Robert Morris a8dd44cf59 modify uvmunmap() to be in aligned pages 
fix a bug in fork() recovering from out of memory
 2020-08-17 08:18:23 -04:00
Robert Morris e283514ad0 pa isn't needed in the uvmunmap() loop 2020-08-17 08:18:23 -04:00
Frans Kaashoek 5dace67371 Typo (thanks yt <jaichenhengjie@qq.com>) 2020-08-10 16:43:33 -04:00
Frans Kaashoek 0502342335
Merge pull request #9 from d0iasm/riscv 
update initcode to avoid using the compressed extension
 2020-08-10 13:54:58 -04:00
Frans Kaashoek 93ca5550b8
Merge pull request #10 from takahirox/VirtioInterruptAck 
Write virtio interrupt ack register in virtio_disk_intr()
 2020-08-10 13:24:57 -04:00
Frans Kaashoek d28c5d9837
Merge pull request #6 from jrrk2/riscv 
Update ramdisk.c
 2020-08-10 13:14:14 -04:00
Frans Kaashoek c31d35d803
Merge branch 'riscv' into riscv 2020-08-10 13:05:17 -04:00
Robert Morris e3b7058907 streamline copyin/copyout code in usertests 
fix bugs in read/write return values when there's an error
 2020-08-10 11:19:10 -04:00
Frans Kaashoek 1f555198d6 Change tf -> trapframe in a few comments 2020-08-10 11:19:10 -04:00
Robert Morris 7f35d7a14e modify each page in usertests countfree() 
get rid of static for walk() and freewalk()
 2020-08-10 11:19:10 -04:00
Robert Morris 2ae9c8e272 defines for UART register bits 2020-08-10 11:19:10 -04:00
Robert Morris 0f50e9527c fix printf() in interrupts 2020-08-10 11:19:10 -04:00
Robert Morris 27057bc9b4 interrupt-driven uart output, hopefully a nice example for teaching. 2020-08-10 11:19:10 -04:00
Robert Morris 1e72d5ca08 cpu->scheduler -> cpu->context to reduce confusion 2020-08-10 11:19:10 -04:00
Robert Morris 5494c91705 rename p->tf to p->trapframe, for consistency with p->context 2020-08-10 11:19:10 -04:00
Robert Morris af9eb9114c make "echo hello > x" truncate file x. 2020-08-10 11:19:10 -04:00
Takahiro 7a5fcb28b3 Write interrupt ack register in virtio_disk_intr() 2020-04-18 14:49:54 -07:00
Asami Doi 8b052656a0 update initcode to avoid using the compressed extension 2020-03-20 12:33:32 +09:00
Jonathan Kimmitt 2b040aa379
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
 2020-01-16 15:05:27 +00:00
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
Fumiya Shigemitsu 90eb90b5e2 Fix minor typos 2019-10-21 21:01:07 +09:00
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
Robert Morris 4de161f973 don't panic if a program frees all its memory with sbrk(). 
if a program sbrk()'s to a non-page-boundary, don't free that page.
corresponding usertests.
 2019-09-20 11:35:27 -04:00
Robert Morris ca30cac702 more incorrect cast to uint 2019-09-20 10:27:03 -04:00
Robert Morris 402e7b5605 fix a potential kernel crash 
add a regression test for it
 2019-09-20 09:41:03 -04:00
Robert Morris 57e40a0204 nits 2019-09-20 06:02:47 -04:00
Robert Morris 2df42355f7 all of PTE_FLAGS 2019-09-17 06:07:58 -04:00
Robert Morris 036b5edf12 set architecture riscv:rv64 -- fix gdb trampoline disassembly, thanks jonathan 2019-09-12 10:48:48 -04:00
Frans Kaashoek 7e6c37e67e Support exit status for exit/wait 
One test case for returning a exit status
Passes usertests, but haven't used it to simplify tests
 2019-09-10 12:30:10 -04:00
Frans Kaashoek 035cca95fe Make the end variable be really at the end of bss, and delete + 4096 in freerange() 2019-09-08 15:19:19 -04:00
Robert Morris e5b7fa62cc thanks to Anthony Coulter 2019-09-08 06:51:58 -04:00
Robert Morris 25e113138d sfence.vma in trampoline as well 2019-09-03 16:29:48 -04:00
Robert Morris 9b9e2dd0f2 fix sfence_vma comment 2019-09-03 16:25:11 -04:00
Robert Morris 86a1d4b295 sfence_vma after satp 2019-09-03 15:45:07 -04:00
Frans Kaashoek 510bcde894 Add major/minor/mkdev 
Maybe apply this change to master
 2019-08-23 19:41:53 -04:00
Frans Kaashoek d98ddadd79 Also release buffer on failed copyout 2019-08-20 12:46:56 -04:00
Frans Kaashoek 6005ef5a1c Release buffer also when copyin fails 2019-08-20 11:57:24 -04:00
Frans Kaashoek d9818b89e1 512 -> BSIZE 2019-08-20 11:56:56 -04:00
Frans Kaashoek a825f22cf8 Merge remote-tracking branch 'origin/master' into riscv 2019-08-19 19:27:29 -04:00
Frans Kaashoek 21ad8c76bc A few now unused DOC 2019-08-19 18:12:19 -04:00
Frans Kaashoek e10f797762 Merge remote-tracking branch 'origin/master' into riscv 2019-08-19 13:35:47 -04:00
Frans Kaashoek 2501560cd6 Cosmetic cleanup: fsinit reads sb and calls loginit. initialize icache 
in main.c and don't make it disk specific; the icache is shared.  This
doesn't matter since we have only one disk, but conceptually cleaner
and maybe helpful to students for mount lab.
 2019-08-18 14:35:11 -04:00
Frans Kaashoek e398a9815c Wrap state of disk driver in a struct so that it is easier to support 
several disks (e.g., in a mount lab).
 2019-08-12 07:20:32 -04:00
Robert Morris 0c10cbe829 syscall lab nits 2019-08-02 11:55:26 -04:00
Frans Kaashoek 62ece4b09e Merge branch 'riscv-bcache' into riscv 2019-08-01 15:46:50 -04:00
Robert Morris fb8a0099d4 fences for starting 2019-08-01 14:59:20 -04:00
Robert Morris d600026c3f cut ramdisk 2019-07-30 16:06:00 -04:00
Frans Kaashoek 848d1906e8 Track in buf if disk "owns" buffer 2019-07-30 12:53:19 -04:00
Frans Kaashoek f37a3e3964 Make pin/unpin explicit 2019-07-30 08:54:43 -04:00
Frans Kaashoek f1bb53c690 The driver should free descriptors, not interrupt handler. This 
avoids handler freeing descriptors before driver sees that the request
has completed.
 2019-07-30 08:13:03 -04:00
Frans Kaashoek 5304310452 Remove B_DIRTY 
Use refcnt to pin blocks into the cache
Replace flags/B_VALID with a boolean field valid
Use info[id].status to signal completion of disk interrupt
Pass a read/write flag to virtio_disk_rw
 2019-07-29 17:33:16 -04:00
Robert Morris 47b9cfee49 separate out timer init code for clarity 2019-07-28 13:16:49 -04:00
Robert Morris 1ec50c5848 xxx 2019-07-28 07:43:22 -04:00
Robert Morris 6507da772d argptr no longer needed, since copyin checks 2019-07-28 06:29:37 -04:00
Robert Morris 629faafa36 cleaner UART register interface 2019-07-27 06:44:24 -04:00
Robert Morris a33f60fea3 console/uart tweaks 2019-07-27 05:47:19 -04:00
Robert Morris cf48b24c03 beautify console.c 2019-07-27 04:15:06 -04:00
Robert Morris 281d450a08 split printf into a separate file, to make console.c more like a driver 2019-07-27 03:49:03 -04:00
Robert Morris cc1a303d09 fetchint isn't used any more 2019-07-26 12:34:06 -04:00
Robert Morris f0987d82dc ??? 2019-07-26 11:09:54 -04:00
Robert Morris c714e3e35c machinevec -> timervec 2019-07-26 10:17:02 -04:00
Robert Morris fa2e2e3c81 uservec before userret in trampoline, to match book and kernelvec 2019-07-26 09:38:22 -04:00
Robert Morris 8d30e21b59 Merge branch 'riscv' of g.csail.mit.edu:xv6-dev into riscv 2019-07-26 04:53:59 -04:00
Robert Morris ea95a6654c trampin -> uservec 
trampout -> userret
 2019-07-26 04:53:46 -04:00
Frans Kaashoek 47c9721d78 a few name changes in panic msg 2019-07-25 06:59:07 -04:00
Robert Morris 4e62de64cd fix an exit/exit deadlock -> one more locking protocol violation 
increase timer rate from 1/second to 10/second
 2019-07-25 06:30:49 -04:00
Robert Morris b19adf79f9 purge x86 stuff from defs.h 2019-07-25 05:37:35 -04:00
Robert Morris 5d5e4e065f comments for timer setup 2019-07-25 05:35:03 -04:00
Robert Morris 9a817bd134 rationalize some vm function names 2019-07-24 15:28:37 -04:00
Robert Morris da898a11b6 ??? 2019-07-24 14:40:13 -04:00
Robert Morris a77287e924 no more PAGEBREAK 2019-07-24 13:33:43 -04:00
Robert Morris b4f89bb529 ping-pong exercise 2019-07-24 10:39:05 -04:00
Robert Morris 8f6865d1f1 display assembly instructions, to help with first.tex exercise 2019-07-24 10:15:45 -04:00
Robert Morris 936afc6e1a mstart -> start 2019-07-23 14:31:12 -04:00
Robert Morris 54178ad94d simplify kernel mapping calls 2019-07-23 12:17:17 -04:00
Robert Morris 55bc96d419 a few core -> CPU 
get rid of PDF generating support
 2019-07-23 11:14:10 -04:00
Frans Kaashoek b8a31c494c one more TRAMPOLINE 2019-07-23 07:30:23 -04:00
Frans Kaashoek 6c78af4a57 fix mapkstack 2019-07-22 20:58:15 -04:00
Frans Kaashoek b2e9c8eea5 Clear U bit for second stack page so that it functions as a guard page 2019-07-22 15:38:08 -04:00