Commit graph

163 commits

Author SHA1 Message Date
Frans Kaashoek 3c25112f38 Delete some obselete stuff 2020-08-21 11:00:45 -04:00
Frans Kaashoek 96a20b0c0f Generate initcode without compressed extensions 2020-08-10 13:55:46 -04:00
Robert Morris 82981fab6b drop QEMUEXTRA 2020-08-10 11:19:10 -04:00
rtm 897f6f34dd yet another toolchain name 2020-08-10 11:19:10 -04:00
Robert Morris 20f1dd9409 more grind 2019-11-07 06:44:23 -05:00
Robert Morris 16b3b63f06 grind: run parallel system calls forever 2019-11-06 11:18:43 -05:00
Robert Morris d9160fb4b9 nits 2019-10-27 08:03:19 -04:00
Anish Athalye d441674477 Make QEMU memory size match PHYSTOP 2019-09-30 20:32:57 -04:00
Robert Morris 57e40a0204 nits 2019-09-20 06:02:47 -04:00
Xi Wang b150908354 add `-bios none' to silence qemu
QEMU 4.1+ emits warnings if -bios is not given, as newer versions
will load the OpenSBI firmware in this case.  Pass `-bios none' to
avoid this issue.
2019-09-13 17:23:36 -04:00
Frans Kaashoek a3f6d9fd1e cow moved to xv6-riscv-fall19 2019-08-26 21:16:33 -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 55bc96d419 a few core -> CPU
get rid of PDF generating support
2019-07-23 11:14:10 -04:00
Robert Morris 6b379e4707 -MD and TRAPFRAME 2019-07-22 14:54:40 -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 4adf016925 eliminate ramdisk 2019-06-13 06:57:38 -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
Robert Morris 91ba81110a gdb backtraces: -ggdb, -fno-omit-frame-pointer, BSIZE=1024 2019-06-06 13:54:03 -04:00
Robert Morris b05bcce939 add kernelvec 2019-06-06 05:19:35 -04:00
Robert Morris dff7ab3f8f make -O work with asm volatile(...) 2019-06-05 15:05:56 -04:00
Robert Morris 5684556c19 clean up -Wall 2019-06-05 14:31:13 -04:00
Robert Morris 3113643768 spinlocks using gcc intrinsics
push_off() / pop_off()
set up per-hart plic stuff so all harts get device interrupts
2019-06-05 14:05:46 -04:00
Robert Morris f1a727b971 start at support for multiple CPUs 2019-06-05 11:42:03 -04:00
Robert Morris 6eae1be755 push/pop all registers when handling interrupt from kernel 2019-06-03 15:23:12 -04:00
Robert Morris 7fd1f1eb0a exec compiles but argstr() doesn't work yet 2019-05-31 12:43:20 -04:00
Robert Morris 5d34fa2a48 -initrd fs.img, ramdisk.c, file system 2019-05-31 11:45:42 -04:00
Robert Morris 2ec1959fd1 fork/wait/exit work 2019-05-31 09:45:59 -04:00
Frans Kaashoek ab0db651af Checkpoint port of xv6 to x86-64. Passed usertests on 2 processors a few times.
The x86-64 doesn't just add two levels to page tables to support 64 bit
addresses, but is a different processor. For example, calling conventions,
system calls, and segmentation are different from 32-bit x86. Segmentation is
basically gone, but gs/fs in combination with MSRs can be used to hold a
per-core pointer. In general, x86-64 is more straightforward than 32-bit
x86. The port uses code from sv6 and the xv6 "rsc-amd64" branch.

A summary of the changes is as follows:

- Booting: switch to grub instead of xv6's bootloader (pass -kernel to qemu),
because xv6's boot loader doesn't understand 64bit ELF files.  And, we don't
care anymore about booting.

- Makefile: use -m64 instead of -m32 flag for gcc, delete boot loader, xv6.img,
bochs, and memfs. For now dont' use -O2, since usertests with -O2 is bigger than
MAXFILE!

- Update gdb.tmpl to be for i386 or x86-64

- Console/printf: use stdarg.h and treat 64-bit addresses different from ints
  (32-bit)

- Update elfhdr to be 64 bit

- entry.S/entryother.S: add code to switch to 64-bit mode: build a simple page
table in 32-bit mode before switching to 64-bit mode, share code for entering
boot processor and APs, and tweak boot gdt.  The boot gdt is the gdt that the
kernel proper also uses. (In 64-bit mode, the gdt/segmentation and task state
mostly disappear.)

- exec.c: fix passing argv (64-bit now instead of 32-bit).

- initcode.c: use syscall instead of int.

- kernel.ld: load kernel very high, in top terabyte.  64 bits is a lot of
address space!

- proc.c: initial return is through new syscall path instead of trapret.

- proc.h: update struct cpu to have some scratch space since syscall saves less
state than int, update struct context to reflect x86-64 calling conventions.

- swtch: simplify for x86-64 calling conventions.

- syscall: add fetcharg to handle x86-64 calling convetions (6 arguments are
passed through registers), and fetchaddr to read a 64-bit value from user space.

- sysfile: update to handle pointers from user space (e.g., sys_exec), which are
64 bits.

- trap.c: no special trap vector for sys calls, because x86-64 has a different
plan for system calls.

- trapasm: one plan for syscalls and one plan for traps (interrupt and
exceptions). On x86-64, the kernel is responsible for switching user/kernel
stacks. To do, xv6 keeps some scratch space in the cpu structure, and uses MSR
GS_KERN_BASE to point to the core's cpu structure (using swapgs).

- types.h: add uint64, and change pde_t to uint64

- usertests: exit() when fork fails, which helped in tracking down one of the
bugs in the switch from 32-bit to 64-bit

- vectors: update to make them 64 bits

- vm.c: use bootgdt in kernel too, program MSRs for syscalls and core-local
state (for swapgs), walk 4 levels in walkpgdir, add DEVSPACETOP, use task
segment to set kernel stack for interrupts (but simpler than in 32-bit mode),
add an extra argument to freevm (size of user part of address space) to avoid
checking all entries till KERNBASE (there are MANY TB before the top 1TB).

- x86: update trapframe to have 64-bit entries, which is what the processor
pushes on syscalls and traps.  simplify lgdt and lidt, using struct desctr,
which needs the gcc directives packed and aligned.

TODO:
- use int32 instead of int?
- simplify curproc(). xv6 has per-cpu state again, but this time it must have it.
- avoid repetition in walkpgdir
- fix validateint() in usertests.c
- fix bugs (e.g., observed one a case of entering kernel with invalid gs or proc
2018-09-23 08:35:30 -04:00
Frans Kaashoek 76d4005f9e thanks mtasm 2018-08-30 14:10:27 -04:00
Frans Kaashoek 8f63beaacb vectors.pl is executable and asks shell for perl 2018-08-30 13:36:07 -04:00
Frans Kaashoek 26108a3b99 thanks tyfkda 2018-08-30 13:27:57 -04:00
Frans Kaashoek 7f3528bcb3 x 2018-08-30 13:25:54 -04:00
Frans Kaashoek 0b6f4c08b9 x 2018-08-30 11:42:10 -04:00
Frans Kaashoek 4f14d8d1e5 Commit to running on an SMP (perhaps with only 1 core). Remove most code
from picirq.c and remove timer.c completely.  Update runoff.list.
2017-08-09 07:44:51 -04:00
Frans Kaashoek d57d37eb87 Thanks to Wolfgang Keller <nubok@users.noreply.github.com> 2017-01-30 20:09:54 -05:00
Antonio Gutierrez 1772853d39 Add support for qemu-system-x86_64 in 64bit hosts
As x86-64 is a superset of x86, we can use qemu-system-x86_64 to run
the OS image.

Signed-off-by: Antonio Gutierrez <chibby0ne@gmail.com>
2017-01-30 20:03:45 -05:00
Icenowy Zheng 91fd3470b0 Fixed broken build on newer gold linker with NaCl support
On platforms with NaCl support, ld.gold -V will return a "elf_i386_nacl" in
addition to "elf_i386", which will make the build fail.
2016-09-26 08:25:17 -04:00
Frans Kaashoek 6670d3b5e0 Straight replacement of B_BUSY with a sleeping lock. 2016-09-11 17:24:04 -04:00
Peter H. Froehlich 5faed8ba64 Fixed QEMU command line avoids raw image warning. 2016-08-18 14:30:30 -04:00
Peter H. Froehlich 216fdf846f Again, QEMU command line to avoid image warning. 2016-08-18 11:20:43 -04:00
Robert Morris 19f65413bd hold ptable.lock for the entire process creation
however, processes still modify their own p->* without locking
2016-08-13 03:44:13 -04:00
Frans Kaashoek ecb40fb19d coding style (per Jeremías Feltan <jeremias.feltan@gmail.com>) 2015-06-30 16:23:56 -04:00
Austin Clements 41f16c2183 Increase VM memory when running qemu-memfs
Presumably because of the pre-loaded file system, the default RAM is
insufficient when running kernelmemfs
2014-10-03 09:44:26 -04:00
Austin Clements 8e54196355 Make kernelmemfs depend on kernel.ld 2014-10-03 09:43:44 -04:00
Austin Clements 0dd991dd20 Fix kernelmemfs linking
Commit 9aa0337d introduced a linker script for linking the kernel image,
but only changed the kernel target to use it.  kernelmemfs was still
using the old linker command line arguments, which weren't sufficient.
2014-10-03 09:39:09 -04:00
Frans Kaashoek 053082fbed ggdb -> gdwarf-2 for gcc4.8 2014-09-23 07:39:32 -04:00
Frans Kaashoek 75dee1219f Oops (thanks David Lawrence) 2014-09-08 18:00:53 -04:00
Frans Kaashoek 86188d9d49 newer versions of qemu have different binary names (per Joel Nider <joel@nider.org>) 2014-07-31 11:15:15 -04:00
Cam Tenny 241c068066 Prevent extra rebuild of fs.img by keeping intermediate object files. 2012-10-24 18:52:40 -04:00