12 commits

Author	SHA1	Message	Date
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)