Commit graph

10 commits

Author SHA1 Message Date
cinap_lenrek e4ce6aadac kernel: handle tos and per process pcycle counters in port/
we might as well handle the per process cycle
counter in the portable part instead of duplicating the code
in every arch and have inconsistent implementations.

we now have a portable kenter() and kexit() function,
that is ment to be used in trap/syscall from user,
which updates the counters.

some kernels missed initializing Mach.cyclefreq.
2020-12-20 22:34:41 +01:00
cinap_lenrek 1d93a5628a pc, pc64, xen: rewrite interrupt handling code
This implements proper intrdisable() support for all
interrupt controllers.

For enable, (*arch->intrassign)(Vctl*) fills in the
Vctl.enable and Vctl.disable pointers with the
appropriate routines and returns the assigned
vector number.

Once the Vctl struct has been linked to its vector
chain, Vctl.enable(Vctl*, shared) gets called with a
flag if the vector has been already enabled (shared).

This order is important here as enabling the interrupt
on the controller before we have linked the chain can
cause spurious interrupts, expecially on mp system
where the interrupt can target a different cpu than
the caller of intrenable().

The intrdisable() case is the other way around.
We first disable the interrupt on the controller
and after that unlink the Vctl from the chain.
On a multiprocessor, the xfree() of the Vctl struct
is delayed to avoid freeing it while it is still
in use by another cpu.

The xen port now also uses pc/irq.c which has been
made generic enougth to handle xen's irq scheme.
Also, archgeneric is now a separate file to avoid
pulling in dependencies from the 8259 interrupt
controller code.
2020-11-29 17:43:22 +01:00
cinap_lenrek 8d51e7fa1a kernel: implement portable userinit() and simplify process creation
replace machine specific userinit() by a portable
implemntation that uses kproc() to create the first
process. the initcode text is mapped using kmap(),
so there is no need for machine specific tmpmap()
functions.

initcode stack preparation should be done in init0()
where the stack is mapped and can be accessed directly.

replacing the machine specific userinit() allows some
big simplifications as sysrfork() and kproc() are now
the only callers of newproc() and we can avoid initializing
fields that we know are being initialized by these
callers.

rename autogenerated init.h and reboot.h headers.
the initcode[] and rebootcode[] blobs are now in *.i
files and hex generation was moved to portmkfile. the
machine specific mkfile only needs to specify how to
build rebootcode.out and initcode.out.
2020-01-26 19:01:36 +01:00
cinap_lenrek 2149600d12 kernel: catch execution read fault on SG_NOEXEC segment
fault() now has an additional pc argument that is
used to detect fault on a non-executable segment.
that is, we check on read fault if the segment
has the SG_NOEXEC attribute and the program counter
is within faulting page.
2019-08-27 03:47:18 +02:00
cinap_lenrek 24057fd4f4 kernel: introduce per process FPU struct (PFPU) for more flexible machine specific fpu handling
introducing the PFPU structue which allows the machine specific
code some flexibility on how to handle the FPU process state.

for example, in the pc and pc64 kernel, the FPsave structure is
arround 512 bytes. with avx512, it could grow up to 2K. instead
of embedding that into the Proc strucutre, it is more effective
to allocate it on first use of the fpu, as most processes do not
use simd or floating point in the first place. also, the FPsave
structure has special 16 byte alignment constraint, which further
favours dynamic allocation.

this gets rid of the memmoves in pc/pc64 kernels for the aligment.

there is also devproc, which is now checking if the fpsave area
is actually valid before reading it, avoiding debuggers to see
garbage data.

the Notsave structure is gone now, as it was not used on any
machine.
2017-11-04 20:08:22 +01:00
cinap_lenrek 41383ad012 kernel: change active.machs from bitmap to char array to support up to 64 cpus on pc64 2016-01-05 05:32:40 +01:00
cinap_lenrek 3ab80c9fe0 pc, pc64, xen: change return type of intrdisable() to void
intrdisable() will always be able to unregister the interrupt
now, so there is no reason to have it return an error value.

all drivers except uart8250 already assumed it to never fail
and theres no need to maintain that complexity.
2014-12-22 16:56:04 +01:00
cinap_lenrek 515893dda6 pc, pc64, xen: simplify #P/irqalloc 2014-12-22 10:49:52 +01:00
cinap_lenrek b18a641397 kernel: remove implicit Proc* argument from procctl()
procctl() is always called with up and it would not
work correctly if passed a different process, so
remove the Proc* argument and use up directly.
2014-11-09 08:19:28 +01:00
mischief 5ba95fdb07 import xen 32 bit paravirtual kernel from /n/sources/xen. 2014-06-24 18:02:25 -07:00