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2019-06-06gdb backtraces: -ggdb, -fno-omit-frame-pointer, BSIZE=1024Robert Morris6-6/+47
2019-06-06fix a create()/unlink() deadlockRobert Morris1-13/+18
2019-06-06add plic.cRobert Morris1-0/+63
2019-06-06add kernelvecRobert Morris2-1/+113
2019-06-05make -O work with asm volatile(...)Robert Morris3-35/+35
2019-06-05clean up -WallRobert Morris7-60/+19
2019-06-05push_off() and pop_off() in myproc()Robert Morris2-4/+9
2019-06-05spinlocks using gcc intrinsicsRobert Morris11-104/+95
push_off() / pop_off() set up per-hart plic stuff so all harts get device interrupts
2019-06-05start at support for multiple CPUsRobert Morris21-837/+87
2019-06-04yield if timer interruptRobert Morris1-3/+11
all user tests passed
2019-06-04timer interrupts -> supervisor software interruptRobert Morris6-18/+148
2019-06-04more sbrk fixesRobert Morris5-23/+22
2019-06-04fix a problem with end. make uartputc() wait until h/w is ready.Robert Morris11-23/+32
2019-06-04check that arguments aren't more than a page in exec()Robert Morris1-1/+6
2019-06-04fix exec argcRobert Morris3-16/+16
2019-06-04support read() and write() bigger than one pageRobert Morris12-62/+95
2019-06-03console input and sbrkRobert Morris6-82/+58
2019-06-03xxRobert Morris2-3/+8
2019-06-03push/pop all registers when handling interrupt from kernelRobert Morris7-83/+48
2019-06-03xxRobert Morris1-11/+13
2019-06-03takes one uart input interrupt, then panicsRobert Morris6-6/+108
2019-06-01first shell prints $ prompt, though no console input yetRobert Morris14-164/+408
2019-05-31exec compiles but argstr() doesn't work yetRobert Morris8-66/+204
2019-05-31-initrd fs.img, ramdisk.c, file systemRobert Morris20-403/+138
2019-05-31fork/wait/exit workRobert Morris30-1859/+1094
2018-10-10No T_SYSCALLFrans Kaashoek1-3/+0
2018-10-09Change mycpu() to use %gs.Frans Kaashoek5-6/+21
2018-10-09not muchFrans Kaashoek2-2/+2
2018-10-09Separate system call path from trap path. Passes usertests on 1 and 2 cpus.Frans Kaashoek8-86/+104
2018-10-07xFrans Kaashoek1-12/+13
2018-10-04Make names line up with textFrans Kaashoek1-9/+9
2018-10-04Oops, didn't commit these changes with last commitFrans Kaashoek1-6/+6
2018-10-03xFrans Kaashoek1-4/+4
2018-10-03Names of text are better.Frans Kaashoek4-34/+34
2018-10-03use x86-64 namesFrans Kaashoek3-6/+6
2018-10-03Switch back bpmain back to mainFrans Kaashoek2-8/+8
2018-10-03don't care about bootloaderFrans Kaashoek1-4/+0
2018-10-02Remove unused typedefsFrans Kaashoek2-7/+5
2018-10-02simplify layout picFrans Kaashoek1-3/+3
2018-10-02Remove now unused PDXFrans Kaashoek1-1/+0
2018-10-02Simplify by freeing user part of addres pace in one page increments. ThisFrans Kaashoek2-6/+2
undoes commit ffe444 and 052e18, which skipped page directories, but was tailored to two-level page table. Undoing doesn't seem to affect boottime for xv6 visibly.
2018-10-02Simplify freeing page tableFrans Kaashoek2-29/+23
2018-10-02Avoid repition in walkpgdirFrans Kaashoek2-60/+24
2018-09-29xFrans Kaashoek1-2/+5
2018-09-29Make sysexit and trapret paths the same, so that forkret can return throughFrans Kaashoek3-12/+22
either path. This helped tracking down a bug: use 144 instead of 32 to find cs in trapframe so that gs is correctly saved and restored. For good measure update linker script, because newer versions of GCC sometimes places symbols passed end.
2018-09-29xFrans Kaashoek1-5/+5
2018-09-23Checkpoint port of xv6 to x86-64. Passed usertests on 2 processors a few times.Frans Kaashoek39-773/+1050
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
2018-09-02Update nameFrans Kaashoek1-3/+3
Use generic 6.828 url (without year)
2018-08-31thanks tyfkdaFrans Kaashoek4-19/+20
2018-08-31thanks Wolfgang KellerFrans Kaashoek1-1/+1
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