Commit graph

2630 commits

Author SHA1 Message Date
Ben Gras
c9fee544b6 sysvipc dir 2009-09-21 14:42:13 +00:00
Ben Gras
da8360c0a3 change startup code to call munmap()/munmap_text() to map out
own 0-pages.
2009-09-21 14:41:47 +00:00
Ben Gras
1c217d038c new sysv ipc call stubs 2009-09-21 14:41:03 +00:00
Ben Gras
8c2bece89f - remove unused kmalloc
- initial implementation of _read_host_time_ns, a function to retrieve
   real-time in ns in vmware virtual machines
2009-09-21 14:39:15 +00:00
Ben Gras
cd8b915ed9 Primary goal for these changes is:
- no longer have kernel have its own page table that is loaded
    on every kernel entry (trap, interrupt, exception). the primary
    purpose is to reduce the number of required reloads.
Result:
  - kernel can only access memory of process that was running when
    kernel was entered
  - kernel must be mapped into every process page table, so traps to
    kernel keep working
Problem:
  - kernel must often access memory of arbitrary processes (e.g. send
    arbitrary processes messages); this can't happen directly any more;
    usually because that process' page table isn't loaded at all, sometimes
    because that memory isn't mapped in at all, sometimes because it isn't
    mapped in read-write.
So:
  - kernel must be able to map in memory of any process, in its own
    address space.
Implementation:
  - VM and kernel share a range of memory in which addresses of
    all page tables of all processes are available. This has two purposes:
      . Kernel has to know what data to copy in order to map in a range
      . Kernel has to know where to write the data in order to map it in
    That last point is because kernel has to write in the currently loaded
    page table.
  - Processes and kernel are separated through segments; kernel segments
    haven't changed.
  - The kernel keeps the process whose page table is currently loaded
    in 'ptproc.'
  - If it wants to map in a range of memory, it writes the value of the
    page directory entry for that range into the page directory entry
    in the currently loaded map. There is a slot reserved for such
    purposes. The kernel can then access this memory directly.
  - In order to do this, its segment has been increased (and the
    segments of processes start where it ends).
  - In the pagefault handler, detect if the kernel is doing
    'trappable' memory access (i.e. a pagefault isn't a fatal
     error) and if so,
       - set the saved instruction pointer to phys_copy_fault,
	 breaking out of phys_copy
       - set the saved eax register to the address of the page
	 fault, both for sanity checking and for checking in
	 which of the two ranges that phys_copy was called
	 with the fault occured
  - Some boot-time processes do not have their own page table,
    and are mapped in with the kernel, and separated with
    segments. The kernel detects this using HASPT. If such a
    process has to be scheduled, any page table will work and
    no page table switch is done.

Major changes in kernel are
  - When accessing user processes memory, kernel no longer
    explicitly checks before it does so if that memory is OK.
    It simply makes the mapping (if necessary), tries to do the
    operation, and traps the pagefault if that memory isn't present;
    if that happens, the copy function returns EFAULT.
    So all of the CHECKRANGE_OR_SUSPEND macros are gone.
  - Kernel no longer has to copy/read and parse page tables.
  - A message copying optimisation: when messages are copied, and
    the recipient isn't mapped in, they are copied into a buffer
    in the kernel. This is done in QueueMess. The next time
    the recipient is scheduled, this message is copied into
    its memory. This happens in schedcheck().
    This eliminates the mapping/copying step for messages, and makes
    it easier to deliver messages. This eliminates soft_notify.
  - Kernel no longer creates a page table at all, so the vm_setbuf
    and pagetable writing in memory.c is gone.

Minor changes in kernel are
  - ipc_stats thrown out, wasn't used
  - misc flags all renamed to MF_*
  - NOREC_* macros to enter and leave functions that should not
    be called recursively; just sanity checks really
  - code to fully decode segment selectors and descriptors
    to print on exceptions
  - lots of vmassert()s added, only executed if DEBUG_VMASSERT is 1
2009-09-21 14:31:52 +00:00
Ben Gras
f5b04e1881 minor change to panic code 2009-09-21 14:28:16 +00:00
Ben Gras
ad4fc01b7b - new entry for bios_wini and ipc
- start ipc server on botting
2009-09-21 14:26:20 +00:00
Ben Gras
89bf7bae27 - tty: only report unrecognized scancodes once; forget about
remembering the origin and cursor position as that feature didn't
   really work properly anyway
 - tty: map in video and font memory using a vm call, access it from C,
   thereby eliminating pesky weird segment calls and assembly to access it,
   and unbreaks loadfont (Roman Ignatov)
 - bios_wini: fix bios_wini by allocating a <1MB buffers for it
 - memory: preallocate ramdisk, makes it a bit faster (and doesn't
   fail halfway if you allocate a huge one)
 - floppy: use <1MB buffer
 - ramdisk proto: because of the 2x1 page reservations, binaries
   got a little fatter and didn't fit on the ramdisk any more.
   increase it.
2009-09-21 14:25:54 +00:00
Ben Gras
36e935fe0f - added 'datasizes' script that shows you the size allocated
for each symbol, usually answering those "why is does my binary have
   such a lot of BSS" questions.
 - stop binpackage looking in /var/spool for package files.
 - let makewhatis recognize .Sh as heading name
 - setup, fsck, df: allow >4kB block sizes painlessly
 - mkfs: new #-of-inodes heuristic that depends on kb, not
   on blocks; i've run out of inodes on my /usr
 - asmconv: don't silently truncate .aligns to 16 bytes
 - ipc* commands for shared memory support
2009-09-21 14:24:29 +00:00
Ben Gras
ba91b3b7d2 - remove unused bootdelay feauture
- only print a line for every boot process if 'verbose' variable set to
   nonzero; reason: with serial output, the long output
   significantly slows down frequent reboots, and causes 'scroll damage'
   that in some cases is pretty bad. also the verbose output doesn't tell
   you the one thing you might want to know about a process: how much memory
   is it using? or how much memory is everything using?
 - short format does print out total memory allocated for processes
2009-09-21 14:23:47 +00:00
Ben Gras
8a54d267f0 - VM_KERN_NOPAGEZERO feature is gone
- sys_getbiosbuffer feature is gone (from kernel; available from vm)
- bump version number because munmap() calls that newly compiled binaries
  will do trigger an ugly (but harmless) error message in older VM's
- some new VM calls and flags, the new IPC calls
- some new CR0 register bits
- added files for shared memory
2009-09-21 14:23:10 +00:00
David van Moolenbroek
0a27cf279e test31 fix 2009-09-20 18:15:24 +00:00
David van Moolenbroek
1fe1b219c9 test32 fix 2009-09-20 16:47:57 +00:00
David van Moolenbroek
f2def7d360 Kernel: correct a few SYSTEM source documentation comments 2009-09-17 20:51:34 +00:00
Tomas Hruby
db56801ddc Some clean up of the segment selectors macros
- [ABCD]_INDEX are not used anywhere

- value of *_SELECTOR is now calculated using the *_INDEX value so changing the
  index does not break the selector

- TSS is now the last of the global selectors. There will be TSS per CPU on SMP
  and the number will vary depending on the maximal supported number of CPUs
  configured
2009-09-15 10:01:06 +00:00
Tomas Hruby
71077d1228 iskernelp() and isuserp() test pointers
- we may test even not fully initialized entries, e.g. during boot
  crash

- is we know the process number we should use iskerneln
  and isusern
2009-09-15 09:58:46 +00:00
Tomas Hruby
78793f4f38 pproc_addr unused and removed 2009-09-15 09:57:54 +00:00
Tomas Hruby
4fd433694f proc_addr() returns address based on location in proc array
- pproc_addr is not neccessary to get the address of a process if we know its
  number

- local proc variables in system calls implementation (sys_task) conflicts with
  the global proc array of all process, therefore the variable were renamed to
  proc_nr as they hold the process number
2009-09-15 09:57:22 +00:00
Erik van der Kouwe
3615d93383 Handle SIGSTOP more consistently and according to POSIX rules; it can no longer be ignored 2009-09-13 12:24:23 +00:00
David van Moolenbroek
ba83b7663d PM: some tiny fixes 2009-09-12 18:36:07 +00:00
David van Moolenbroek
c72487dc9f remove unused NEW_KSIG definition 2009-09-07 22:12:50 +00:00
David van Moolenbroek
e538509508 Kernel: remove unused CHECK_DEADLOCK definition 2009-09-07 20:23:31 +00:00
David van Moolenbroek
18ae423990 it's/its 2009-09-06 17:13:08 +00:00
David van Moolenbroek
9c19233879 Kernel: do_[sv]devio.c header corrections 2009-09-06 15:54:15 +00:00
David van Moolenbroek
8ef6c9b063 cleanup: sys_irqrmpolicy does not need IRQ vector 2009-09-06 14:24:44 +00:00
David van Moolenbroek
9b417d616f remove unused IRQ_ENDPT definition 2009-09-06 14:14:03 +00:00
David van Moolenbroek
979bcfc195 - sys_privctl: don't mix message types
- sys_privctl: remove CTL_MM_PRIV (third parameter)
- remove obsolete sys_svrctl.c library file
2009-09-06 12:37:13 +00:00
David van Moolenbroek
32b2758ba8 syslib: make sys_nice use field aliases 2009-09-05 12:51:00 +00:00
Erik van der Kouwe
f92e0dafb5 Disabled check in test 28 which hard links a directory; this is nott required by POSIX and not supported (currently) by MINIX. Also corrected total number of tests. 2009-09-04 20:23:25 +00:00
Erik van der Kouwe
141e5531ad Now all tests except for 28 succeed in root mode 2009-09-04 14:14:49 +00:00
Erik van der Kouwe
9dda815067 Remove redundant line from previous patch 2009-09-04 13:36:43 +00:00
Erik van der Kouwe
e1e4d6649f Allow setuid tests 11 and 33 to run. The former still fails (but now with a meaningful error) while the latter succeeds. Only 2 tests are left borken on default MINIX, namely 11 and 28. 2009-09-04 13:18:49 +00:00
Erik van der Kouwe
ec4b567894 Avoid alarm to prevent the setitimer interval from being reset 2009-09-03 20:35:22 +00:00
Thomas Veerman
360dc9104c - Added netconf script which makes it a lot easier to change network settings.
- Modified the setup script to use the netconf script for the network
   configuration:
    - Moved step 2 to step 8 and renamed the steps in between.
    - Autopart adapted to print step 3 instead of step 4.
2009-09-03 09:38:27 +00:00
David van Moolenbroek
8aeb17c75e typo 2009-09-02 21:55:26 +00:00
Ben Gras
3d3e12f50f postgresql services entry. 2009-09-02 13:23:22 +00:00
David van Moolenbroek
7e9e0ce9bc FXP: support for 8086/1064 (reported and tested by Jose Luis Sanchez) 2009-08-30 16:13:46 +00:00
David van Moolenbroek
a57fbb11cd Fix time(1) for custom system HZ values (reported by Jose Luis Sanchez 2009-08-30 16:06:59 +00:00
Tomas Hruby
2e293ce7c0 system_init() renamed to arch_init()
- a better name for architecture specific init function

- some of x86 init code must execute in protected mode

- prot_init() removed from this function and still called in cstart() Imho this
  should be called from the architecture specific assembly not cstart. cstart
  perform Minix monitor specific tasks and will be touched once another
  bootloader is in use, e.g. booting via tftp, therefore we keep it as is for
  now.

- this is a backport from the SMP code which requires this. Merging will be simpler
2009-08-30 14:55:30 +00:00
Tomas Hruby
b1aaee6dcc Printing the trap info even if kernel crashes is handy. 2009-08-29 19:38:11 +00:00
Tomas Hruby
50473107c2 saved_proc in exception() may be NULL
If an exception happens in kernel while the kernel is booting and no processes
are running yet, saved_proc == NULL and priting any process related information
results in dumping rubish.

This check is mostly useful when debugging kernel stuff. Should _never_ happen
on a production kernel.
2009-08-29 19:26:46 +00:00
David van Moolenbroek
42f0bf7dda VFS: fetch_name() buffer underflow (reported by John Peace, bug #305) 2009-08-29 08:22:50 +00:00
Tomas Hruby
4903a734b8 IDT is initialized in idt_init() not in prot_init()
This is a backport form the SMP branch. Not required here, it only makes life
for SMP easier. And future merging too.

- filling the IDT is removed from prot_init()

- struct gate_table_s is a public type

- gate_table_pic is a global array as it is used by APIC code too

- idt_copy_vectors() is also global and used by idt_init() as well as
  apic_idt_init()

- idt_init() is called right after prot_init() in system_init()
2009-08-28 15:55:30 +00:00
Erik van der Kouwe
1162806940 Re-disable complete_bars, it was not needed for PRO/100 despite the error message 2009-08-27 07:10:03 +00:00
Erik van der Kouwe
ada4859302 Extend Intel PRO/100 support 2009-08-26 21:01:46 +00:00
David van Moolenbroek
d84472dfc8 urlget: broken ftpget call, reported by Charles Littlefield 2009-08-23 13:53:03 +00:00
David van Moolenbroek
47e6506d7b support for TCP sockets in send/sendto/recv/recvfrom 2009-08-21 09:59:09 +00:00
Erik van der Kouwe
5cdd995dc5 Use su to allow tests 3, 6, 17, 18, 19, 21 and 25 to work as root, making testing easier 2009-08-18 19:58:34 +00:00
Erik van der Kouwe
192c0be4a8 Fix HUGE_VAL warnings 2009-08-18 19:10:48 +00:00
Erik van der Kouwe
d81563a9b1 Fix HUGE_VAL warnings 2009-08-18 19:10:20 +00:00