| Age | Commit message (Collapse) | Author | Files | Lines | |
|---|---|---|---|---|---|
| 2019-06-11 | separate source into kernel/ user/ mkfs/ | Robert Morris | 1 | -271/+0 | |
| 2019-06-06 | gdb backtraces: -ggdb, -fno-omit-frame-pointer, BSIZE=1024 | Robert Morris | 1 | -0/+9 | |
| 2019-06-05 | push_off() and pop_off() in myproc() | Robert Morris | 1 | -1/+2 | |
| 2019-06-04 | fix exec argc | Robert Morris | 1 | -1/+1 | |
| 2019-06-04 | support read() and write() bigger than one page | Robert Morris | 1 | -5/+13 | |
| 2019-06-03 | console input and sbrk | Robert Morris | 1 | -0/+35 | |
| 2019-06-01 | first shell prints $ prompt, though no console input yet | Robert Morris | 1 | -6/+74 | |
| 2019-05-31 | fork/wait/exit work | Robert Morris | 1 | -177/+12 | |
| 2018-09-23 | Checkpoint port of xv6 to x86-64. Passed usertests on 2 processors a few times. | Frans Kaashoek | 1 | -7/+23 | |
| 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 | |||||
| 2017-08-09 | Commit to running on an SMP (perhaps with only 1 core). Remove most code | Frans Kaashoek | 1 | -1/+0 | |
| from picirq.c and remove timer.c completely. Update runoff.list. | |||||
| 2017-02-01 | A tiny bit of clean up (e.g., move code searching cpu array from lapic.c into | Frans Kaashoek | 1 | -1/+1 | |
| mycpu() in proc.c. | |||||
| 2017-02-01 | use panic | Frans Kaashoek | 1 | -1/+2 | |
| 2017-01-31 | Start of an experiment to remove the use of gs for cpu local variables. | Frans Kaashoek | 1 | -2/+2 | |
| 2016-09-11 | Replace I_BUSY with sleep locks | Frans Kaashoek | 1 | -0/+1 | |
| 2016-09-02 | Fix a few lines that runoff is complaining about that they are too long | Frans Kaashoek | 1 | -1/+2 | |
| 2016-09-02 | APIC IDs may not be consecutive and start from zero, so we cannot really use it | Frans Kaashoek | 1 | -1/+1 | |
| as a direct index into cpus. Record apicid in struct cpu and have cpunum() look for it. Replace cpu->id with cpunum() everywhere, and replace cpu->id with cpu->apicid. Thanks to Xi Wang. | |||||
| 2016-08-25 | Remove trailing white space with: | Frans Kaashoek | 1 | -4/+4 | |
| for f in *.{h,c}; do sed -i .sed 's/[[:blank:]]*$//' $f; done (Thanks to Nicolás Wolovick) | |||||
| 2015-11-15 | nits | Frans Kaashoek | 1 | -8/+6 | |
| 2015-11-15 | Remove console input.lock | Nathaniel Wesley Filardo | 1 | -10/+13 | |
| Use cons.lock for everything. This eliminates the possibility that two CPUS independently, simultaneously manipulate the CRTC in cgaputc. | |||||
| 2015-11-15 | Add sanity check panic for CRTC interactions | Nathaniel Wesley Filardo | 1 | -0/+3 | |
| 2011-09-07 | Remove unused 'state' variable that broke the build in recent gcc's | Austin Clements | 1 | -2/+1 | |
| 2011-09-02 | Fix same wonky pagebreak bug in console.c | Austin Clements | 1 | -1/+1 | |
| 2011-07-29 | Map kernel high | Frans Kaashoek | 1 | -1/+5 | |
| Very important to give qemu memory through PHYSTOP :( | |||||
| 2011-02-28 | fixes from Peter Froehlich | Russ Cox | 1 | -6/+6 | |
| 2011-01-11 | make new code like old code | Russ Cox | 1 | -2/+3 | |
| Variable declarations at top of function, separate from initialization. Use == 0 instead of ! for checking pointers. Consistent spacing around {, *, casts. Declare 0-parameter functions as (void) not (). Integer valued functions return -1 on failure, 0 on success. | |||||
| 2010-09-02 | Get consoleintr back on one page | Austin Clements | 1 | -5/+2 | |
| 2010-09-02 | Get cgaputc and consputc back on the same page | Austin Clements | 1 | -6/+2 | |
| 2010-09-01 | Space police | Austin Clements | 1 | -1/+1 | |
| 2010-09-01 | Tab police | Austin Clements | 1 | -2/+2 | |
| 2009-09-30 | Handle backspace on serial input and output better. Better solutions are ↵ | Austin Clements | 1 | -1/+7 | |
| welcome. | |||||
| 2009-09-20 | Hack to make newlines on the serial port work | Austin Clements | 1 | -0/+3 | |
| 2009-08-30 | assorted fixes: | Russ Cox | 1 | -3/+3 | |
| * rename c/cp to cpu/proc * rename cpu.context to cpu.scheduler * fix some comments * formatting for printout | |||||
| 2009-08-08 | shuffle and tweak for formatting. | Russ Cox | 1 | -116/+113 | |
| pdf has very good page breaks now. would be a good copy for fall 2009. | |||||
| 2009-05-31 | group locks into structs they protect. | rsc | 1 | -12/+15 | |
| few naming nits. | |||||
| 2009-05-31 | Add serial port input/output. | rsc | 1 | -23/+5 | |
| Delete parallel port output. Works well with qemu -nographic mode. | |||||
| 2009-03-08 | be consistent: no underscores in function names | rsc | 1 | -23/+23 | |
| 2008-10-12 | minor cleanup | kolya | 1 | -1/+1 | |
| 2008-08-22 | clean up circular buffers, so pipe can queue 512 bytes rather than 511 | kolya | 1 | -7/+7 | |
| 2008-08-21 | fix obvious printf nits after reading through code | kolya | 1 | -1/+1 | |
| 2007-09-27 | nit | rsc | 1 | -1/+1 | |
| 2007-09-27 | use console lock | rsc | 1 | -1/+1 | |
| 2007-08-30 | make new Homework 8 work | rtm | 1 | -1/+1 | |
| 2007-08-30 | oops - broke circular buffer | rsc | 1 | -4/+2 | |
| 2007-08-28 | comments; rename irq_ to pic_ | rsc | 1 | -1/+5 | |
| 2007-08-28 | spaces around else for rtm | rsc | 1 | -2/+2 | |
| 2007-08-28 | more consistent spacing | rsc | 1 | -3/+3 | |
| 2007-08-28 | nits | rsc | 1 | -4/+1 | |
| 2007-08-28 | Change dev read/write functions | rsc | 1 | -3/+8 | |
| to take inode* instead of minor number. Unlock console inode during console_read and console_write. Otherwise background processes cannot write to console while the shell is reading it waiting for input. | |||||
| 2007-08-28 | avoid double echo | rsc | 1 | -1/+0 | |
| 2007-08-28 | oops | rsc | 1 | -1/+2 | |
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index : 135e2/xv6-labs.git | |
| xv6-labs-2024-winter | 135e2 |
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