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Author SHA1 Message Date
Frans Kaashoek 899cc02660 Experiment with being more precise setting permissions for user pages. 
Growing adds R|W pages (without X).  Exec() marks the stack only R|W.

Probably could setup permissions for text and data better if we call
ld with --no-omagic instead of -N.
 2022-08-12 13:22:10 -04:00
Robert Morris c908d20132 put walk() in defs.h so it's clear students can call it 2022-08-10 07:21:50 -04:00
Robert Morris 7d8bfdcbe3 nothing much 2022-08-09 15:11:25 -04:00
OptimisticSide 1226b09dc4 Remove setproc prototype 2021-08-31 14:14:38 -04:00
Frans Kaashoek d4cecb269f kvmmake() makes a complete kernel page table, matching Figure 3.3 2020-10-14 20:28:16 -04:00
Robert Morris c61cc69413 eliminate virtio DMA into kernel stacks. 2020-10-05 19:30:27 -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 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 af9eb9114c make "echo hello > x" truncate file x. 2020-08-10 11:19:10 -04:00
Robert Morris 56583b1402 updated alarmtest 2019-10-03 15:02:19 -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 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 f37a3e3964 Make pin/unpin explicit 2019-07-30 08:54:43 -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 6507da772d argptr no longer needed, since copyin checks 2019-07-28 06:29:37 -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 b19adf79f9 purge x86 stuff from defs.h 2019-07-25 05:37:35 -04:00
Robert Morris 9a817bd134 rationalize some vm function names 2019-07-24 15:28:37 -04:00
Robert Morris a77287e924 no more PAGEBREAK 2019-07-24 13:33:43 -04:00
Robert Morris 54178ad94d simplify kernel mapping calls 2019-07-23 12:17:17 -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
Frans Kaashoek 9156632701 One way of supporting a guard page below kstack: allocate kstacks in 
procinit() and map them high up (below TRAMPOLNE) with an empty
mapping below each stack.  Never free a kernel stack.

Another way would be to allocate and map them dynamically, but then we
need to reload page table when switching processes in scheduler()
and/or have a kernel pagetable per proc (if we want k->stack to be the
same virtual address in each process).

One gotcha: kernel addresses are not equal to physical addresses for
stack addresses.  A stack address must be translated if we need its
physical address (e.g., virtio passes a stack address to the disk).
 2019-07-19 08:38:51 -04:00
Robert Morris f59c1bf1d8 try to continue from walk() failing to allocate a page-table page 2019-07-02 11:45:06 -04:00
Robert Morris abfe9999f4 have fork() fail, not panic, if not enough phys mem 2019-07-01 17:46:06 -04:00
Robert Morris de9d72c908 virtio disk driver 2019-06-13 06:49:02 -04:00
Robert Morris 5753553213 separate source into kernel/ user/ mkfs/ 2019-06-11 09:57:14 -04:00
Renamed from defs.h (Browse further)