| Age | Commit message (Collapse) | Author | Files | Lines | |
|---|---|---|---|---|---|
| 2018-10-04 | Make names line up with text | Frans Kaashoek | 1 | -9/+9 | |
| 2018-10-04 | Oops, didn't commit these changes with last commit | Frans Kaashoek | 1 | -6/+6 | |
| 2018-10-03 | x | Frans Kaashoek | 1 | -4/+4 | |
| 2018-10-03 | Names of text are better. | Frans Kaashoek | 4 | -34/+34 | |
| 2018-10-03 | use x86-64 names | Frans Kaashoek | 3 | -6/+6 | |
| 2018-10-03 | Switch back bpmain back to main | Frans Kaashoek | 2 | -8/+8 | |
| 2018-10-03 | don't care about bootloader | Frans Kaashoek | 1 | -4/+0 | |
| 2018-10-02 | Remove unused typedefs | Frans Kaashoek | 2 | -7/+5 | |
| 2018-10-02 | simplify layout pic | Frans Kaashoek | 1 | -3/+3 | |
| 2018-10-02 | Remove now unused PDX | Frans Kaashoek | 1 | -1/+0 | |
| 2018-10-02 | Simplify by freeing user part of addres pace in one page increments. This | Frans Kaashoek | 2 | -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. | |||||
| 2018-10-02 | Simplify freeing page table | Frans Kaashoek | 2 | -29/+23 | |
| 2018-10-02 | Avoid repition in walkpgdir | Frans Kaashoek | 2 | -60/+24 | |
| 2018-09-29 | x | Frans Kaashoek | 1 | -2/+5 | |
| 2018-09-29 | Make sysexit and trapret paths the same, so that forkret can return through | Frans Kaashoek | 3 | -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. | |||||
| 2018-09-29 | x | Frans Kaashoek | 1 | -5/+5 | |
| 2018-09-23 | Checkpoint port of xv6 to x86-64. Passed usertests on 2 processors a few times. | Frans Kaashoek | 39 | -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 | |||||
| 2018-09-02 | Update name | Frans Kaashoek | 1 | -3/+3 | |
| Use generic 6.828 url (without year) | |||||
| 2018-08-31 | thanks tyfkda | Frans Kaashoek | 4 | -19/+20 | |
| 2018-08-31 | thanks Wolfgang Keller | Frans Kaashoek | 1 | -1/+1 | |
| 2018-08-30 | x | Frans Kaashoek | 1 | -1/+1 | |
| 2018-08-30 | Allow holding to be called with interrupts enabled (for Mark Morrissey). | Frans Kaashoek | 1 | -1/+5 | |
| 2018-08-30 | Delete a patch | Frans Kaashoek | 3 | -154/+4 | |
| Adjust typesetting of code | |||||
| 2018-08-30 | x | Frans Kaashoek | 1 | -3/+6 | |
| 2018-08-30 | x | Frans Kaashoek | 1 | -8/+9 | |
| 2018-08-30 | thanks mtasm | Frans Kaashoek | 3 | -2/+10 | |
| 2018-08-30 | thanks wxdao | Frans Kaashoek | 1 | -2/+2 | |
| 2018-08-30 | thanks eyalz800 | Frans Kaashoek | 2 | -2/+2 | |
| 2018-08-30 | vectors.pl is executable and asks shell for perl | Frans Kaashoek | 1 | -1/+2 | |
| 2018-08-30 | thanks mataness | Frans Kaashoek | 1 | -1/+3 | |
| 2018-08-30 | thanks tyfkda | Frans Kaashoek | 1 | -2/+2 | |
| 2018-08-30 | x | Frans Kaashoek | 1 | -1/+1 | |
| 2018-08-30 | Remove unused flags (thanks Wolfgang Keller) | Frans Kaashoek | 2 | -50/+4 | |
| 2018-08-30 | x | Frans Kaashoek | 1 | -1/+1 | |
| 2018-08-30 | x | Frans Kaashoek | 1 | -4/+4 | |
| 2018-08-30 | Because sleeplocks replaced B_BUSY the holding test can | Frans Kaashoek | 1 | -1/+1 | |
| be more specific (thanks Mark Morrissey) | |||||
| 2018-08-30 | x | Frans Kaashoek | 1 | -1/+0 | |
| 2017-10-24 | stricter log consumption by write() | Robert Morris | 1 | -1/+1 | |
| 2017-10-08 | improve swtch comment | Robert Morris | 1 | -2/+3 | |
| 2017-08-29 | fix runoff complaints about pagination and long lines | Robert Morris | 11 | -33/+25 | |
| 2017-08-10 | thx | Frans Kaashoek | 1 | -6/+8 | |
| 2017-08-09 | Update comment to reflect xv6 doesn't have per-cpu segments anymore | Frans Kaashoek | 1 | -1/+1 | |
| 2017-08-09 | nothing much | Robert Morris | 3 | -3/+5 | |
| 2017-08-09 | Commit to running on an SMP (perhaps with only 1 core). Remove most code | Frans Kaashoek | 10 | -125/+6 | |
| from picirq.c and remove timer.c completely. Update runoff.list. | |||||
| 2017-08-09 | comment fixes | Robert Morris | 2 | -9/+12 | |
| 2017-08-08 | Thanks Anton Burtsev <[email protected]> | Frans Kaashoek | 1 | -0/+1 | |
| 2017-08-08 | fix iput() to more obviously avoid deadlock | Robert Morris | 1 | -7/+9 | |
| 2017-08-08 | a little more lock documentation | Robert Morris | 1 | -0/+13 | |
| 2017-08-08 | protect ip->valid and ip->nlink with sleep lock in iput() | Robert Morris | 2 | -10/+12 | |
| 2017-08-08 | change ip->flags&I_VALID to ip->valid | Robert Morris | 2 | -12/+11 | |
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index : 135e2/xv6-labs.git | |
| xv6-labs-2024-winter | 135e2 |
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