Commit graph

25 commits

Author SHA1 Message Date
Ben Gras
d12d57dcd8 arm: recognize instruction fetch pagefault
. an instruction fetch pagefault generates a prefetch
	  abort exception, this should also be a source of
	  a pagefault event
	. the saved_lr argument to the C exception handler was
	  sometimes an address, sometimes a pointer to that address;
	  the kernel sometimes dereferences it, so it should always be
	  an in-kernel address, never a userspace address. fix in mpx.S
	  makes it always a pointer.
	. move dumping of all processes over serial out of
	  the arch-specific arch_system.c
2013-05-21 15:05:06 +02:00
Kees Jongenburger
1e1ff96aea arm:vm caching fix.
Improve reliability by using write trough cache.
2013-05-16 20:39:20 +02:00
Kees Jongenburger
b9cb8251bc arm:make no assumptions about TRE and AFE
The bootloader can leave the system control register
in at state that doesn't match our setup. make no assumptions
and configure TRE and AFE.
2013-05-16 20:39:19 +02:00
Kees Jongenburger
e6bac75a8b ARM:Rename ARM_BIG_PAGE to ARM_SECTION.
The natural term to use when talking about MINIX big pages on ARM
is SECTION. A section is a level 1 page table entry pointing to
a 1MB area.

Change-Id: I9bd27ca99bc772126c31c27a537b1415db20c4a6
2013-04-29 11:42:26 +02:00
Ben Gras
0cfff08e56 libexec: mmap support, prealloc variants
In libexec, split the memory allocation method into cleared and
non-cleared. Cleared gives zeroed memory, non-cleared gives 'junk'
memory (that will be overwritten anyway, and so needn't be cleared)
that is faster to get.

Also introduce the 'memmap' method that can be used, if available,
to map code and data from executables into a process using the
third-party mmap() mode.

Change-Id: I26694fd3c21deb8b97e01ed675dfc14719b0672b
2013-04-24 10:18:16 +00:00
Kees Jongenburger
390f852bd1 arm:cleanup remove special case memory handling.
We used to load the memory driver above the other modules to allow
the memory driver (ramdisk) to grow. We no longer want or need this
this as we have a working mmc driver.
2013-04-12 20:52:57 +02:00
David van Moolenbroek
50e46307de Move MINIX reboot definitions into minix/reboot.h
Also fix a buffer overflow in commands/reboot/sh_wall.c.

Change-Id: I3a61057c4f0221d1700e14d44520b4ad17f1dbe1
2013-03-20 16:50:01 +00:00
Ben Gras
5acaa0814f kernel, ramdisk: some boot unification
To use the new SD building script, Linux has to be configured with
loop.max_part=15 on the command line (or set at module load time)
to make the loopback device see the partitions.

This commit removes a lot of differences between the ARM and x86
boot ramdisk and rc scripts. It changes the ARM build from running
from ramdisk to requiring a full filesystem on the SD image and
booting into it.

	. ramdisk: remove some arm-only utilities only used for running
	  from the shell
	. remove ARM-only rc.arm, proto.arm.small, ttys and mylogin.sh
	  boot-time ramdisk files
	. change kernel to add "arch" variable so userland knows what
	  we're running on from sysenv
	. make ARM use the regular ramdisk rc file, changed to distinguish
	  i386-only and ARM-only drivers; requires rootdevname to be set
	. change /etc/rc and /usr/etc/rc to start i386-only drivers only on
	  i386 systems
	. change the kernel/arm to have a special case for the memory
	  driver to load it higher so it can be bigger
	. add uEnv.txt, cmdline.txt and a for now highly linux-dependent
	  SD preparation script arm_sdimage.sh to the git repository in
	  releasetools/

Change-Id: I68910ba4e96ee80f7a12b65e48b5d39b43ca6397
2013-03-07 14:29:27 +00:00
Ben Gras
2aa82a9c7b ARM: kernel: fix sanity check for copying
. phys_copy() (taken from memcpy) can legitimately
	  cause pagefaults below the source/dest address due
	  to word-alignment

Change-Id: Ibee8f069781d16caea671246c021fb17a2a892b1
2013-02-20 20:34:40 +01:00
Kees Jongenburger
d47f512a13 kernel:handle improper svc calls gracefully.
Change-Id: Id0f694dd2a8c5981900601fcdb2112ee266d0d76
2013-02-19 17:02:29 +01:00
Ben Gras
b18224051a kernel: more stack for vm 2013-02-19 13:53:56 +01:00
Lionel Sambuc
e4fa9802cb ARM: Enable caches
First round, some more optimizations are possible and should be
activated.

Change-Id: I3b7dee7c82fbffd823a08bec1c5d5ebcf769f92f
2013-02-18 09:08:26 +01:00
Lionel Sambuc
b36292e232 ARM: Fix interrupt management
Interrupts where not correctly masked while in kernel, which
breaks one of the current main assumptions.

Also remove some duplication on ARM asm files, and add a function
to check the status of ARM irqs (not compiled by default)

Change-Id: I3c25d2b388f93fd8fe423998b94b3c4f140ba831
2013-02-18 09:07:55 +01:00
Kees Jongenburger
eff37b8a8b kernel:enable trace on arm.
Change-Id: Iabe6dfd758e8f1cdb4a18e2f2ab8f8ca988f3c86
2013-02-17 08:40:38 +01:00
Ben Gras
3bc6d7df06 impove memory accounting
. the total amount of memory in the system didn't include the memory
	  used by the boot-time modules and some dynamic allocation by the
	  kernel at boot time (to map in VM). especially apparent on our
	  ARM board with 'only' 512MB of memory and a huge ramdisk.
	. also: *add* the VM loaded module to the freelist after it has
	  been allocated for & mapped in instead of cutting it *out* of the
	  freelist! so we get a few more MB free..

Change-Id: If37ac32b21c9d38610830e21421264da4f20bc4f
2013-02-11 19:31:57 +01:00
Ben Gras
5a0585359d ARM divsi3.S: raise(SIGFPE) when called for
. raise(SIGFPE) for modulo-0/divide-0 operations in
	  internal int division functions
	. gcc: do not link with -lgcc anywhere so these internal
	  functions are always used from libc instead of (sometimes)
	  masked by -lgcc
	. together fixes test53 on ARM

Change-Id: I31ec19dfdd68b8a92695595da901874e63106f9d
2013-02-09 22:24:59 +01:00
Ben Gras
298b41b523 libexec: detect short files
if an exec() fails partway through reading in the sections, the target
process is already gone and a defunct process remains. sanity checking
the binary beforehand helps that.

test10 mutilates binaries and exec()s them on purpose; making an exec()
fail cleanly in such cases seems like acceptable behaviour.

fixes test10 on ARM.

Change-Id: I1ed9bb200ce469d4d349073cadccad5503b2fcb0
2013-02-04 12:04:35 +01:00
Ben Gras
8ea66915f2 kernel: scheduling fix for ARM
. make read_tsc_64 use the free-running clock, significantly
	  improving scheduling behaviour

Change-Id: Idf6a12f6e26be7fe3b3664c278cae846d8b2a442
2013-02-03 22:49:05 +01:00
Thomas Veerman
db8c1ee9d0 ARM: provide free running clock to replace ccnt
The Cycle CouNTer on ARM cannot be used reliably as it wraps around
rather quickly and can be altered by user space (on Minix). Furthermore,
it's buggy when wrapping and is not implemented at all on the Linaro
Beagleboard emulator.

This patch programs GPTIMER10 as a free running clock at 1.625 MHz (it
doesn't generate interrupts). It's memory mapped into every process,
which enables libsys to provide micro_delay().

Change-Id: Iba004c6c62976762fe154ea390d69e518eec1531
2013-01-31 15:19:11 +00:00
Ben Gras
e3e5cf6d34 arm: make signal handlers work
A few kernel and calling convention adjustments to make sigsend and
sigreturn work for arm.

	. provide a arch_proc_setcontext for earm in kernel
	. set LR in context of signal handler to provide a proper
	  return address (to __sigreturn)
	. change __sigreturn to retrieve the sigcontext pointer
	  from the sigframe struct and pass it to _sigreturn() in r0

Change-Id: Icd135a70595382c79d11d8dd9876f6a6f1df41f8
2013-01-30 04:10:12 +00:00
Thomas Veerman
df0c35f0f5 Kernel/ARM: faster context save 2013-01-25 17:07:02 +00:00
Thomas Veerman
fb4b3da7da Kernel/ARM: use modern srsdb invocation 2013-01-25 17:07:02 +00:00
Thomas Veerman
1a60a84cb7 ARM: clear BSS upon boot 2013-01-25 17:07:01 +00:00
Thomas Veerman
c96cd5e1a0 ARM: provide means to pass boot cmdline 2013-01-25 17:07:01 +00:00
Lionel Sambuc
b1c4ba4ab6 ARM updates
Due to the ABI we are using we have to use the earm architecture
moniker for the build system to behave correctly. This involves
then some headers to move around.

There is also a few related Makefile updates as well as minor
source code corrections.
2013-01-17 10:03:58 +01:00