summaryrefslogtreecommitdiff
path: root/ioapic.c
AgeCommit message (Collapse)AuthorFilesLines
2019-06-11separate source into kernel/ user/ mkfs/Robert Morris1-76/+0
2018-09-23Checkpoint port of xv6 to x86-64. Passed usertests on 2 processors a few times.Frans Kaashoek1-1/+2
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
2017-08-09Commit to running on an SMP (perhaps with only 1 core). Remove most codeFrans Kaashoek1-6/+0
from picirq.c and remove timer.c completely. Update runoff.list.
2016-08-25Remove trailing white space with:Frans Kaashoek1-1/+1
for f in *.{h,c}; do sed -i .sed 's/[[:blank:]]*$//' $f; done (Thanks to Nicolás Wolovick)
2009-07-11trap cleanupRuss Cox1-2/+2
IRQ_OFFSET -> T_IRQ0 (a trap number not an IRQ number) T_SYSCALL 0x30 -> 0x40 (move out of IRQ range)
2009-03-08be consistent: no underscores in function namesrsc1-12/+12
2007-12-20oops - wrong bit (vic zandy)rsc1-1/+1
2007-08-28comments; rename irq_ to pic_rsc1-0/+1
2007-08-27delete unnecessary #include linesrsc1-2/+0
2007-08-27Simplify MP hardware code.rsc1-50/+47
Mainly delete unused constants and code. Move mp_startthem to main.c as bootothers.
2006-09-08formatting nitsrsc1-2/+2
2006-09-08consistency.kaashoek1-34/+36
2006-09-07run without lapic and ioapic, if they are not presentkaashoek1-31/+35
if no lapic available, use 8253pit for clock now xv6 runs both on qemu (uniprocessor) and bochs (uniprocessor and MP)
2006-09-06standardize various * conventionsrsc1-7/+7
2006-09-06spacing fixes: no tabs, 2-space indents (for rtm)rsc1-3/+3
2006-09-03nitskaashoek1-2/+1
2006-08-13fix iget() bug that allocated in-use inode[] entriesrtm1-2/+0
2006-08-11fix deadlock---iput(dp) asapkaashoek1-1/+1
working unlink, but doesn't free dir blocks that become empty remove out-of-date comment in ioapic
2006-08-08fix race in holding() check in acquire()rtm1-3/+3
give cpu1 a TSS and gdt for when it enters scheduler() and a pseudo proc[] entry for each cpu cpu0 waits for each other cpu to start up read() for files
2006-08-04better interrupt plan---this one appears to workkaashoek1-0/+82
ioapic