Commit graph

170 commits

Author SHA1 Message Date
Jan Kobler
29fe671680 arm: clear highly mapped kernel bss
. added bss range values for the high (paged) kernel and
	  clear it in pre_init
	. this changes the meaning of the current _edata end _end in the
	  pre_init phase to mean: highly mapped bss; and the new symbols
	  _kern_unpaged_edata ... _kern_unpaged_edata to mean directly
	  mapped (pre_init) bss. This was previously _edata and _end.
	. added a sanity check in kmain (ben@)

The values can be verified by:

${CROSS_TOOLS}/arm-elf32-minix-objdump -xD ${OBJ}/kernel/kernel

Signed-off-by: Jan Kobler <eng1@koblersystems.de>
2014-07-28 17:05:55 +02:00
Ben Gras
be9fe09e97 x86 multiboot.h
Change-Id: I245564a98fb9e2572b88f8feb7411ad6800a543c
2014-03-03 20:47:05 +01:00
Gerard
78da142dab Replaced common u64.h functions with operators.
Change-Id: I71b7b4879209eeff89ce5748d67102afebf871dc
2014-03-02 12:28:32 +01:00
Ben Gras
a06e2ab395 big <utmp.h>-inspired netbsd switch
import/switch of:
init, getty, reboot, halt, shutdown, wall, last

changes:
	. change reboot() call to netbsd prototype and args
	. allows pristine <utmp.h>
	. use clean <sys/reboot.h> instead of <minix/reboot.h>
	. implement TIOCSCTTY for use by getty so getty can get
	  controlling terminal from init's child(ren)
	. allow NULL envp for exec

Change-Id: I5ca02cb4230857140c08794bbfeba7df982c58a3
2014-03-01 09:05:02 +01:00
Thomas Cort
f5dbfe789e uname: normalize release and version
Most systems provide the full version number in the
'release' field and the kernel version in 'version'.
Minix used to split the full version number between
release and version which caused problems for pkgsrc
and other applications. This patch brings Minix's
uname in line with other systems such as NetBSD.
It also brings the getty banner in line with NetBSD.

Old Minix uname:
	sysname->Minix
	nodename->10.0.2.15
	release->3
	version->2.1
	machine->i686

New Minix uname:
	sysname->Minix
	nodename->10.0.2.15
	release->3.2.1
	version->Minix 3.2.1 (GENERIC)
	machine->i686

Change-Id: I966633dfdcf2f9485966bb0d0d042afc45bbeb7d
2014-03-01 09:04:55 +01:00
Lionel Sambuc
9fab85c2de Replacing timer_t by netbsd's timer_t
* Renamed struct timer to struct minix_timer
 * Renamed timer_t to minix_timer_t
 * Ensured all the code uses the minix_timer_t typedef
 * Removed ifdef around _BSD_TIMER_T
 * Removed include/timers.h and merged it into include/minix/timers.h
 * Resolved prototype conflict by renaming kernel's (re)set_timer
   to (re)set_kernel_timer.

Change-Id: I56f0f30dfed96e1a0575d92492294cf9a06468a5
2014-03-01 09:04:54 +01:00
Kees Jongenburger
7e11828c6e arm:create SoC specific bsp directory and move code to there.
Created a new directory called bsp (board support package) to hold
board or system on chip specific code. The idea is the following.

Change-Id: Ica5886806940facae2fa5492fcc938b3c2b989be
2014-02-07 11:14:39 +01:00
Kees Jongenburger
3a2fb1ae8c arm:determine board_id using bootargs.board_name
On startup determine the board_id based on the board name
passed from u-boot. This code also export "board" for use
by  userland using sysenv.

Change-Id: I1064a49497c82b06f50d98650132bc0a7f543568
2013-12-17 11:32:38 +01:00
Kees Jongenburger
4127817d7b arm:add board_id to machine to enable runtime configuration.
Modified the machine struct in include/minix/type.h to have an
additional field called board_id. This fields can be read out
by userland and drivers at runtime to enable automatic
configuration. The board_id field contains information about
the hardware architecture / board and such.

Change-Id: Ib12bc0d43fc9dbdb80ee0751c721ee516de1d2d6
2013-12-03 09:19:25 +01:00
Thomas Cort
9f23acf410 kernel: spelling fixes
Change-Id: I73c759bdef98be35be77130895ae0ec497e1b954
2013-10-09 20:24:17 -04:00
Ben Gras
c8f3b10909 fix a few more minix specific warnings
. also disable stack protection feature for gcc,
	  causes build errors for pkgsrc gcc on minix

Change-Id: I1c6e2bcb4d948098d642543d7b2711284ee55c72
2013-08-27 16:16:03 +00:00
Lukasz Hryniuk
06154a34a4 Some more 64bit function eradication.
. Replace 64bit funcions with operators in arch_clock.c
  . Replace 64bit funcions with operators in proc.c
  . Replace 64bit funcions with operators in vbox.c
  . Replace 64bit funcions with operators in driver.c
  . Eradicates is_zero64, make_zero64, neg64

Change-Id: Ie4e1242a73534f114725271b2e2365b2004cb7b9
2013-08-07 12:35:53 +00:00
Antoine Leca
da82f9b2e8 <a.out.h>, MINIX style: remove as obsolete
Change-Id: Icc8b7210d60a93ac9cc4610d676dcba270756410
2013-08-06 11:43:35 +02:00
Kees Jongenburger
571ea5b4d7 arm:remove hardcoded base address for the in kernel serial.
Removed hardcoded base address for in kernel serial. This will ease
porting to different boards and allow us to remap i/o at later stage.

Change-Id: I4a4e00ed2aa2f94dfe928dc43a6816d3b94576b7
2013-05-24 11:17:52 +02:00
Thomas Cort
5142b1f388 kernel: rename realtime to monotonic, add realtime
Old realtime was used for both timers (where an accurate count of
all ticks is needed) and the system time. In order to implement
adjtime(2), these duties must be separated as changing the time
of day by a small amount shouldn't affect timers in any way nor
should it change the boot time.

Following the naming of the clocks used by clock_gettime(2). The
clock named 'realtime' will represent the best guess at the
current wall clock time, and the clock named 'monotonic' will
represent the absolute time the system has been running.
Use monotonic for timers in kernel and in drivers. Use realtime
for determining time of day, dates, etc.

This commit simply renames realtime to monotonic and adds a new
tick counter named realtime. There are no functional changes in
this commit. It just lays the foundation for future work.
2013-04-04 15:04:52 +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
Thomas Veerman
fcdf1f4a55 Kernel: remove compile warnings 2013-03-06 09:20:00 +00:00
Thomas Veerman
e232e0cbf0 Kernel: make shutdown more verbose
Change-Id: Iab5fed4cb617a9dbce164ff81c7dedf408e9fd98
2013-03-04 10:13:50 +00:00
Lionel Sambuc
f14fb60209 Libraries updates and cleanup
* Updating common/lib
 * Updating lib/csu
 * Updating lib/libc
 * Updating libexec/ld.elf_so
 * Corrected test on __minix in featuretest to actually follow the
   meaning of the comment.
 * Cleaned up _REENTRANT-related defintions.
 * Disabled -D_REENTRANT for libfetch
 * Removing some unneeded __NBSD_LIBC defines and tests

Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
2013-01-14 11:36:26 +01:00
Erik van der Kouwe
57c748b968 Remove ability to pass commands to bootloader 2012-11-22 19:16:17 +01:00
Ben Gras
ba05f39d1e kernel: some boottime sanitychecks
. Check if we have the right number of boot modules
	. Check if the ELF parsing of VM actually succeeded

Both these are root causes of less-than-obvious other
errors/asserts a little further down the line; uncovered
while experimenting with booting by iPXE, specifically
(a) iPXE having a 8-multiboot-modules limit and
(b) trying to boot a gzipped VM.
2012-11-08 11:40:35 +01:00
Ben Gras
2d72cbec41 SYSENTER/SYSCALL support
. add cpufeature detection of both
	. use it for both ipc and kernelcall traps, using a register
	  for call number
	. SYSENTER/SYSCALL does not save any context, therefore userland
	  has to save it
	. to accomodate multiple kernel entry/exit types, the entry
	  type is recorded in the process struct. hitherto all types
	  were interrupt (soft int, exception, hard int); now SYSENTER/SYSCALL
	  is new, with the difference that context is not fully restored
	  from proc struct when running the process again. this can't be
	  done as some information is missing.
	. complication: cases in which the kernel has to fully change
	  process context (i.e. sigreturn). in that case the exit type
	  is changed from SYSENTER/SYSEXIT to soft-int (i.e. iret) and
	  context is fully restored from the proc struct. this does mean
	  the PC and SP must change, as the sysenter/sysexit userland code
	  will otherwise try to restore its own context. this is true in the
	  sigreturn case.
	. override all usage by setting libc_ipc=1
2012-09-24 15:53:43 +02:00
David van Moolenbroek
cf9a4ec79b Kernel: clean up include statements a bit
Coverity was flagging a recursive include between kernel.h and
cpulocals.h. As cpulocals.h also included proc.h, we can move that
include statement into kernel.h, and clean up the source files'
include statements accordingly.
2012-08-14 16:29:05 +00:00
David van Moolenbroek
6ded58b510 kernel: give kernel tasks their process name back 2012-07-26 14:35:08 +00:00
Ben Gras
cbcdb838f1 various coverity-inspired fixes
. some strncpy/strcpy to strlcpy conversions
	. new <minix/param.h> to avoid including other minix headers
	  that have colliding definitions with library and commands code,
	  causing parse warnings
	. removed some dead code / assignments
2012-07-16 14:00:56 +02:00
Ben Gras
1d48c0148e segmentless smp fixes
adjust the smp booting procedure for segmentless operation. changes are
mostly due to gdt/idt being dependent on paging, because of the high
location, and paging being on much sooner because of that too.

also smaller fixes: redefine DESC_SIZE, fix kernel makefile variable name
(crosscompiling), some null pointer checks that trap now because of a
sparser pagetable, acpi sanity checking
2012-07-15 22:47:20 +02:00
Ben Gras
50e2064049 No more intel/minix segments.
This commit removes all traces of Minix segments (the text/data/stack
memory map abstraction in the kernel) and significance of Intel segments
(hardware segments like CS, DS that add offsets to all addressing before
page table translation). This ultimately simplifies the memory layout
and addressing and makes the same layout possible on non-Intel
architectures.

There are only two types of addresses in the world now: virtual
and physical; even the kernel and processes have the same virtual
address space. Kernel and user processes can be distinguished at a
glance as processes won't use 0xF0000000 and above.

No static pre-allocated memory sizes exist any more.

Changes to booting:
        . The pre_init.c leaves the kernel and modules exactly as
          they were left by the bootloader in physical memory
        . The kernel starts running using physical addressing,
          loaded at a fixed location given in its linker script by the
          bootloader.  All code and data in this phase are linked to
          this fixed low location.
        . It makes a bootstrap pagetable to map itself to a
          fixed high location (also in linker script) and jumps to
          the high address. All code and data then use this high addressing.
        . All code/data symbols linked at the low addresses is prefixed by
          an objcopy step with __k_unpaged_*, so that that code cannot
          reference highly-linked symbols (which aren't valid yet) or vice
          versa (symbols that aren't valid any more).
        . The two addressing modes are separated in the linker script by
          collecting the unpaged_*.o objects and linking them with low
          addresses, and linking the rest high. Some objects are linked
          twice, once low and once high.
        . The bootstrap phase passes a lot of information (e.g. free memory
          list, physical location of the modules, etc.) using the kinfo
          struct.
        . After this bootstrap the low-linked part is freed.
        . The kernel maps in VM into the bootstrap page table so that VM can
          begin executing. Its first job is to make page tables for all other
          boot processes. So VM runs before RS, and RS gets a fully dynamic,
          VM-managed address space. VM gets its privilege info from RS as usual
          but that happens after RS starts running.
        . Both the kernel loading VM and VM organizing boot processes happen
	  using the libexec logic. This removes the last reason for VM to
	  still know much about exec() and vm/exec.c is gone.

Further Implementation:
        . All segments are based at 0 and have a 4 GB limit.
        . The kernel is mapped in at the top of the virtual address
          space so as not to constrain the user processes.
        . Processes do not use segments from the LDT at all; there are
          no segments in the LDT any more, so no LLDT is needed.
        . The Minix segments T/D/S are gone and so none of the
          user-space or in-kernel copy functions use them. The copy
          functions use a process endpoint of NONE to realize it's
          a physical address, virtual otherwise.
        . The umap call only makes sense to translate a virtual address
          to a physical address now.
        . Segments-related calls like newmap and alloc_segments are gone.
        . All segments-related translation in VM is gone (vir2map etc).
        . Initialization in VM is simpler as no moving around is necessary.
        . VM and all other boot processes can be linked wherever they wish
          and will be mapped in at the right location by the kernel and VM
          respectively.

Other changes:
        . The multiboot code is less special: it does not use mb_print
          for its diagnostics any more but uses printf() as normal, saving
          the output into the diagnostics buffer, only printing to the
          screen using the direct print functions if a panic() occurs.
        . The multiboot code uses the flexible 'free memory map list'
          style to receive the list of free memory if available.
        . The kernel determines the memory layout of the processes to
          a degree: it tells VM where the kernel starts and ends and
          where the kernel wants the top of the process to be. VM then
          uses this entire range, i.e. the stack is right at the top,
          and mmap()ped bits of memory are placed below that downwards,
          and the break grows upwards.

Other Consequences:
        . Every process gets its own page table as address spaces
          can't be separated any more by segments.
        . As all segments are 0-based, there is no distinction between
          virtual and linear addresses, nor between userspace and
          kernel addresses.
        . Less work is done when context switching, leading to a net
          performance increase. (8% faster on my machine for 'make servers'.)
	. The layout and configuration of the GDT makes sysenter and syscall
	  possible.
2012-07-15 22:30:15 +02:00
Ben Gras
7336a67dfe retire PUBLIC, PRIVATE and FORWARD 2012-03-25 21:58:14 +02:00
Ben Gras
6a73e85ad1 retire _PROTOTYPE
. only good for obsolete K&R support
	. also remove a stray ansi.h and the proto cmd
2012-03-25 16:17:10 +02:00
Arun Thomas
1f0bfa8519 kernel: Update copyright date 2012-02-22 16:36:26 +01:00
Antoine Leca
3fb8cb760c More cleaning up 2012-02-15 19:04:58 +00:00
Arun Thomas
1a8cf59d04 Add MKWATCHDOG option 2011-07-29 20:37:39 +02:00
Erik van der Kouwe
35b203fdb1 Initialize NMI watchdog only once, after enabling paging 2011-06-22 17:56:57 +02:00
Ben Gras
a77c2973b3 fix clang warnings -R in kernel/ and servers/ 2011-06-09 16:09:13 +02:00
Arun Thomas
350b60661a ELF multiboot support 2011-05-04 18:51:43 +02:00
Arun Thomas
6e86430130 Remove code for kernel task stack initialization
We no longer have kernel tasks, so this code is unnecessary
2011-01-27 12:18:33 +00:00
David van Moolenbroek
a7285dfabc Kernel/RS: fix permission computation with 32+ system processes 2010-12-07 10:32:42 +00:00
Arun Thomas
f0ab18377d GCC/clang: int64 routines in C 2010-11-12 18:38:10 +00:00
Ben Gras
fd2b22474f update for releases with git. 2010-11-11 02:00:12 +00:00
Tomas Hruby
c9bfb13cdb Kernel keeps information about each cpu
- kernel maintains a cpu_info array which contains various
  information about each cpu as filled when each cpu boots

- the information contains idetification, features etc.
2010-10-26 21:07:27 +00:00
Tomas Hruby
a665ae3de1 Userspace scheduling - exporting stats
- contributed by Bjorn Swift

- adds process accounting, for example counting the number of messages
  sent, how often the process was preemted and how much time it spent
  in the run queue. These statistics, along with the current cpu load,
  are sent back to the user-space scheduler in the Out Of Quantum
  message.

- the user-space scheduler may choose to make use of these statistics
  when making scheduling decisions. For isntance the cpu load becomes
  especially useful when scheduling on multiple cores.
2010-09-19 15:52:12 +00:00
Tomas Hruby
5b8b623765 SMP - lazy FPU
- when a process is migrated to a different CPU it may have an active
  FPU context in the processor registers. We must save it and migrate
  it together with the process.
2010-09-15 14:11:25 +00:00
Tomas Hruby
e2701da5a9 SMP - Single shot local timer
- APIC timer always reprogrammed if expired

- timer tick never happens when in kernel => never immediate return
  from userspace to kernel because of a buffered interrupt

- renamed argument to lapic_set_timer_one_shot()

- removed arch_ prefix from timer functions
2010-09-15 14:11:06 +00:00
Tomas Hruby
387e1835d1 SMP - BSP halts APs before shutting down 2010-09-15 14:10:54 +00:00
Tomas Hruby
1e273f640e SMP - Scheduler can assign process to a cpu
- machine information contains the number of cpus and the bsp id

- a dummy SMP scheduler which keeps all system processes on BSP and
  all other process on APs. The scheduler remembers how many processes
  are assigned to each CPU and always picks the one with the least
  processes for a new process.
2010-09-15 14:10:33 +00:00
Tomas Hruby
67f039540c SMP - proc_ptr and bill_ptr initialization
- they should point somewhere
2010-09-15 14:10:24 +00:00
Tomas Hruby
fac5fbfdbf SMP - CPU local run queues
- each CPU has its own runqueues

- processes on BSP are put on the runqueues later after a switch to
  the final stack when cpuid works to avoid special cases

- enqueue() and dequeue() use the run queues of the cpu the process is
  assigned to

- pick_proc() uses the local run queues

- printing of per-CPU run queues ('2') on serial console
2010-09-15 14:10:18 +00:00
Tomas Hruby
85cca7096f SMP - The slave CPUs turn paging on
- APs wait until BSP turns paging on, it is not possible to safely
  execute any code on APs until we can turn paging on as well as it
  must be done synchronously everywhere

- APs turn paging on but do not continue and wait
2010-09-15 14:10:07 +00:00
Tomas Hruby
6aa26565e6 SMP - Big kernel lock (BKL)
- to isolate execution inside kernel we use a big kernel lock
  implemented as a spinlock

- the lock is acquired asap after entering kernel mode and released as
  late as possible. Only one CPU as a time can execute the core kernel
  code

- measurement son real hw show that the overhead of this lock is close
  to 0% of kernel time for the currnet system

- the overhead of this lock may be as high as 45% of kernel time in
  virtual machines depending on the ratio between physical CPUs
  available and emulated CPUs. The performance degradation is
  significant
2010-09-15 14:10:03 +00:00
Tomas Hruby
62c666566e SMP - We boot APs
- kernel detects CPUs by searching ACPI tables for local apic nodes

- each CPU has its own TSS that points to its own stack. All cpus boot
  on the same boot stack (in sequence) but switch to its private stack
  as soon as they can.

- final booting code in main() placed in bsp_finish_booting() which is
  executed only after the BSP switches to its final stack

- apic functions to send startup interrupts

- assembler functions to handle CPU features not needed for single cpu
  mode like memory barries, HT detection etc.

- new files kernel/smp.[ch], kernel/arch/i386/arch_smp.c and
  kernel/arch/i386/include/arch_smp.h

- 16-bit trampoline code for the APs. It is executed by each AP after
  receiving startup IPIs it brings up the CPUs to 32bit mode and let
  them spin in an infinite loop so they don't do any damage.

- implementation of kernel spinlock

- CONFIG_SMP and CONFIG_MAX_CPUS set by the build system
2010-09-15 14:09:52 +00:00