10 years agoadded tcgetattr/tcsetattr for bash
Andrew Waterman [Mon, 8 Feb 2010 23:00:35 +0000 (15:00 -0800)]
added tcgetattr/tcsetattr for bash

10 years agoMerge branch 'master' of ssh://waterman@scm.millennium.berkeley.edu/project/cs/radlab...
Andrew Waterman [Sat, 6 Feb 2010 23:38:14 +0000 (15:38 -0800)]
Merge branch 'master' of ssh://waterman@scm.millennium.berkeley.edu/project/cs/radlab/src/parlab/ros

10 years agoAdded mprotect; made mmap work (dumbly) for files
Andrew Waterman [Sat, 6 Feb 2010 23:38:06 +0000 (15:38 -0800)]
Added mprotect; made mmap work (dumbly) for files

Had to add sys_pread to accomplish this

10 years agomatrix now sets up default PATH
Andrew Waterman [Sat, 6 Feb 2010 23:35:54 +0000 (15:35 -0800)]
matrix now sets up default PATH

10 years agoFixes double-free when destroying a process
Barret Rhoden [Thu, 4 Feb 2010 03:07:33 +0000 (19:07 -0800)]
Fixes double-free when destroying a process

Just free up to UVPT.  memwalking through UVPT (or VPT) will lead to
headaches and usually something other than what you want.

10 years agomon_cpuinfo takes a decimal
Barret Rhoden [Thu, 4 Feb 2010 01:21:34 +0000 (17:21 -0800)]
mon_cpuinfo takes a decimal

Instead of hex.

10 years agox86 core id reordering
Barret Rhoden [Thu, 4 Feb 2010 01:07:27 +0000 (17:07 -0800)]
x86 core id reordering

Provides support for non-contiguous hardware core ids, since x86 encodes
topological information in their lapic ids.  If you use send_ipi, you
usually will want to convert to the hardware id using

Also, if you want to send a group IPI (logical), there is a separate
function for that now.

10 years agoChanged env_user_mem_walk to use return codes
Andrew Waterman [Mon, 1 Feb 2010 06:42:35 +0000 (22:42 -0800)]
Changed env_user_mem_walk to use return codes

This way, a walk can be aborted in the middle--say, if
you found what you wanted or if you encountered an error.
Fork uses mem_walk to copy pages now.

10 years agoAdded env_user_mem_walk
Andrew Waterman [Mon, 1 Feb 2010 02:18:23 +0000 (18:18 -0800)]
Added env_user_mem_walk

..which calls a user-specified function on each resident
page in a specified range.  can be used to free memory
(env_user_mem_free was rewritten to use it), or other
neat things.

10 years agofixed a bug in kpage_alloc
Andrew Waterman [Mon, 1 Feb 2010 01:49:55 +0000 (17:49 -0800)]
fixed a bug in kpage_alloc

10 years agoSplit headers up to reduce namespace pollution
Andrew Waterman [Wed, 27 Jan 2010 21:49:55 +0000 (13:49 -0800)]
Split headers up to reduce namespace pollution

10 years agoAdded distinct user mmap and brk segments
Andrew Waterman [Wed, 27 Jan 2010 21:49:26 +0000 (13:49 -0800)]
Added distinct user mmap and brk segments

brk only works below UMMAP_START and mmap only works above it.
This is a bit of a ghetto hack but will get us out of trouble for now.

10 years agobacktrace on user fault in SPARC port
Andrew Waterman [Wed, 27 Jan 2010 21:48:07 +0000 (13:48 -0800)]
backtrace on user fault in SPARC port

10 years agoadded sparc syscalls to makefile
Andrew Waterman [Wed, 27 Jan 2010 21:47:06 +0000 (13:47 -0800)]
added sparc syscalls to makefile

10 years agoUse stdbool.h to define bool
Andrew Waterman [Wed, 27 Jan 2010 21:46:50 +0000 (13:46 -0800)]
Use stdbool.h to define bool

10 years agoSplit procinfo.h from procdata.h to reduce namespace pollution
Andrew Waterman [Wed, 27 Jan 2010 21:46:24 +0000 (13:46 -0800)]
Split procinfo.h from procdata.h to reduce namespace pollution

10 years agoMinor SPARC header file changes to make glibc compile
Andrew Waterman [Wed, 27 Jan 2010 21:45:54 +0000 (13:45 -0800)]
Minor SPARC header file changes to make glibc compile

10 years agoAdded forwarded POSIX syscalls to SPARC port
Andrew Waterman [Wed, 27 Jan 2010 21:44:54 +0000 (13:44 -0800)]
Added forwarded POSIX syscalls to SPARC port

10 years agoMoved memory-barrier macros out of arch/atomic.h
Andrew Waterman [Wed, 27 Jan 2010 21:44:15 +0000 (13:44 -0800)]
Moved memory-barrier macros out of arch/atomic.h

...just so the Xen ring buffer header doesn't have to suck in
the entire arch/atomic.h.  (The real reason is that glibc chokes
on atomic_add, so don't want it polluting the namespace...)

10 years agoI hate failed merges
Andrew Waterman [Wed, 27 Jan 2010 21:37:57 +0000 (13:37 -0800)]
I hate failed merges

10 years agoMade fork/exec slow but correct.
Andrew Waterman [Wed, 27 Jan 2010 21:32:45 +0000 (13:32 -0800)]
Made fork/exec slow but correct.

Since mmap is actually used now, we need to scan the whole
virtual address range to determine what to copy or unmap.
But this is really slow, so need to walk the pagetable for
efficiency (using env_user_mem_walk or the like)

10 years agoAdded dumb implementation of get_free_va_range.
Andrew Waterman [Wed, 27 Jan 2010 21:27:55 +0000 (13:27 -0800)]
Added dumb implementation of get_free_va_range.

Right now it just linearly scans the user's address space,
which is obviously a low-performance implementation.  But
it works...

10 years agoFixes some syscall issues, esp getpid
Barret Rhoden [Mon, 25 Jan 2010 20:17:24 +0000 (12:17 -0800)]
Fixes some syscall issues, esp getpid

Adds sys_getpid to the syscall table, provides return values for calls
like proc_yield, keeps the table entries in the order in ros/syscall.h,
and reorganizes the syscalls into groups.

10 years agoFixes multiboot memory detection for weird types
Barret Rhoden [Fri, 22 Jan 2010 19:25:51 +0000 (11:25 -0800)]
Fixes multiboot memory detection for weird types

IAW the spec, type 1 is free, all others are reserved.  Some machines
(the new nehalem) had types greater than our array of strings.

10 years agoFixes trapframes on x86
Barret Rhoden [Fri, 22 Jan 2010 19:10:07 +0000 (11:10 -0800)]
Fixes trapframes on x86

Missed the extra segmentation registers in the specialized irq handler
when implementing TLS.

10 years agoFree user memory only up to UVPT on x86
Barret Rhoden [Fri, 22 Jan 2010 06:24:57 +0000 (22:24 -0800)]
Free user memory only up to UVPT on x86

Not sure about sparc, but we don't want to free the page tables via the
UVPT or VPT mappings during user_mem_free() on x86.

10 years agoFixes set_timer() for x86
Barret Rhoden [Fri, 22 Jan 2010 01:41:24 +0000 (17:41 -0800)]
Fixes set_timer() for x86

10 years agoPrototype of env_user_mem_walk
Andrew Waterman [Fri, 22 Jan 2010 00:33:17 +0000 (16:33 -0800)]
Prototype of env_user_mem_walk

This is a general mechanism to apply some operator to
all pages mapped into a process's address space.  for
example, env_user_mem_free can be implemented using
this plus a callback that does page_decref.  it will
be useful for implementing fork/exec "right".

10 years agoImplemented syscall dispatch table
Andrew Waterman [Fri, 22 Jan 2010 00:30:28 +0000 (16:30 -0800)]
Implemented syscall dispatch table

...rather than the huge switch statement.  Also fixed a bug
in sys_brk (it's supposed to return the new break; an error
is indicated by retval != newbrk).

10 years agoadded memchr function to string.c
Andrew Waterman [Fri, 22 Jan 2010 00:28:05 +0000 (16:28 -0800)]
added memchr function to string.c

10 years agoadded memchr function to string.c
Andrew Waterman [Fri, 22 Jan 2010 00:26:28 +0000 (16:26 -0800)]
added memchr function to string.c

10 years agoenv_user_mem_free now frees procinfo/procdata pages
Andrew Waterman [Thu, 21 Jan 2010 01:18:20 +0000 (17:18 -0800)]
env_user_mem_free now frees procinfo/procdata pages

The trick is to free up to KERNBASE, not UTOP,
because the procinfo/procdata pages lie above UTOP.

10 years agoMerge branch 'master' of ssh://waterman@scm.millennium.berkeley.edu/project/cs/radlab...
Andrew Waterman [Tue, 19 Jan 2010 23:23:01 +0000 (15:23 -0800)]
Merge branch 'master' of ssh://waterman@scm.millennium.berkeley.edu/project/cs/radlab/src/parlab/ros

10 years agoSped up SPARC kernel crossings
Andrew Waterman [Tue, 19 Jan 2010 23:22:56 +0000 (15:22 -0800)]
Sped up SPARC kernel crossings

Trash the register windows on kernel->user transition,
rather than flushing them.

10 years agoAdded set_timer(usec) function
Andrew Waterman [Tue, 19 Jan 2010 23:22:24 +0000 (15:22 -0800)]
Added set_timer(usec) function

On i386, it uses lapic_set_timer; on SPARC it uses
the hacked-up RAMP interrupt timer.

10 years agoFixes procdata's ring buffers
Barret Rhoden [Mon, 11 Jan 2010 21:15:43 +0000 (13:15 -0800)]
Fixes procdata's ring buffers

Ring buffers need their space to be allocated directly after the sring

10 years agoProcdata and procinfo can be more than a page long
Barret Rhoden [Sat, 9 Jan 2010 02:47:29 +0000 (18:47 -0800)]
Procdata and procinfo can be more than a page long

These regions need to be contiguous so that the kernel can access them
via kernel addresses.

10 years agoMerge branch 'master' of ssh://waterman@scm.millennium.berkeley.edu/project/cs/radlab...
Andrew Waterman [Thu, 14 Jan 2010 20:07:20 +0000 (12:07 -0800)]
Merge branch 'master' of ssh://waterman@scm.millennium.berkeley.edu/project/cs/radlab/src/parlab/ros

10 years agoSped up fork/exec significantly
Andrew Waterman [Thu, 14 Jan 2010 20:05:51 +0000 (12:05 -0800)]
Sped up fork/exec significantly

It's still not copy on write, but it's much faster now.
Two main changes: don't have env_segment_free operate
on the entire address space, but rather just the text,
heap, data, and stack.  Also, I implemented pagecopy,
which is like memcpy but assumes a large size/alignment

10 years agoFixed issues with the RealTek network driver and the slab allocator
Paul Pearce [Tue, 12 Jan 2010 01:14:13 +0000 (20:14 -0500)]
Fixed issues with the RealTek network driver and the slab allocator

Previously the RealTek network driver would use kmalloc for allocating
the RX and TX descriptor rings. A requirement of the rings was that
they be 256 byte alligned. We had previously discussed this, and
determined that by default kmalloc would, if asked for X bytes, return
X byte aligned memory. This is no longer the case with the new
slab allocator, so the driver no longer functioned correctly

We now directly request pages, to ensure proper alignment.

10 years agoStartcore message uses printd instead of printk
Andrew Waterman [Mon, 11 Jan 2010 07:15:53 +0000 (23:15 -0800)]
Startcore message uses printd instead of printk

10 years agoMerge branch 'master' of ssh://waterman@scm.millennium.berkeley.edu/project/cs/radlab...
Andrew Waterman [Mon, 11 Jan 2010 05:59:53 +0000 (21:59 -0800)]
Merge branch 'master' of ssh://waterman@scm.millennium.berkeley.edu/project/cs/radlab/src/parlab/ros

10 years agoMade resource allocation use printd instead of printk
Andrew Waterman [Mon, 11 Jan 2010 05:59:40 +0000 (21:59 -0800)]
Made resource allocation use printd instead of printk

10 years agoMade SPARC SMP boot messages use printd instead of printk
Andrew Waterman [Mon, 11 Jan 2010 05:59:12 +0000 (21:59 -0800)]
Made SPARC SMP boot messages use printd instead of printk

10 years agoSped up memset
Andrew Waterman [Mon, 11 Jan 2010 05:58:24 +0000 (21:58 -0800)]
Sped up memset

Even if initial pointer isn't aligned, fast-forward to
use word or dword stores.  This speeds up BSS zeroing a lot.

10 years agoMatrix's behavior is less stupid
Andrew Waterman [Mon, 11 Jan 2010 05:53:12 +0000 (21:53 -0800)]
Matrix's behavior is less stupid

If you hit enter, it doesn't try to execute the current directory :-)

10 years agoMerge branch 'master' of ssh://waterman@scm.millennium.berkeley.edu/project/cs/radlab...
Andrew Waterman [Mon, 11 Jan 2010 05:52:18 +0000 (21:52 -0800)]
Merge branch 'master' of ssh://waterman@scm.millennium.berkeley.edu/project/cs/radlab/src/parlab/ros

10 years agoMade SPARC read()/write() more compliant
Andrew Waterman [Mon, 11 Jan 2010 05:52:07 +0000 (21:52 -0800)]
Made SPARC read()/write() more compliant

Attempt to do as many front-end calls as needed to
write or read an entire buffer, rather than stopping
at the end of a page.

10 years agoFixed proc state initialization
Andrew Waterman [Sun, 10 Jan 2010 02:18:41 +0000 (18:18 -0800)]
Fixed proc state initialization

10 years agoMerge branch 'master' of ssh://waterman@scm.millennium.berkeley.edu/project/cs/radlab...
Andrew Waterman [Sun, 10 Jan 2010 02:08:01 +0000 (18:08 -0800)]
Merge branch 'master' of ssh://waterman@scm.millennium.berkeley.edu/project/cs/radlab/src/parlab/ros

10 years agomade test_interrupts sparc compatible
Andrew Waterman [Sun, 10 Jan 2010 02:07:45 +0000 (18:07 -0800)]
made test_interrupts sparc compatible

10 years agoGave half of colors to global color map
Andrew Waterman [Sun, 10 Jan 2010 02:05:24 +0000 (18:05 -0800)]
Gave half of colors to global color map

10 years agoMade c99 compatibility changes
Andrew Waterman [Sun, 10 Jan 2010 02:04:06 +0000 (18:04 -0800)]
Made c99 compatibility changes

10 years agox86 thread local storage tweaks
Barret Rhoden [Sat, 9 Jan 2010 01:25:22 +0000 (17:25 -0800)]
x86 thread local storage tweaks

Pulls the actual LDT out of procdata, since the kernel doesn't need to
read/write the LDT, and allows userspace to mmap() only what it needs
based on the number of potential vcores.

10 years agoMonitor exit
Barret Rhoden [Sat, 9 Jan 2010 00:58:25 +0000 (16:58 -0800)]
Monitor exit

Can leave the monitor, which is useful when dealing with breakpoints for
debugging.  Also cleans up the x86 trap return path.

10 years agoThread local storage for x86
Barret Rhoden [Thu, 7 Jan 2010 21:53:47 +0000 (13:53 -0800)]
Thread local storage for x86

On parlib, using the TLS array.  There is no protection from
segmentation: userspace can write its own LDT (exposed via procdata),
which could also be a decent way to select different TLSs for a core
(for user threading).

This also fixes a bug where the stack_ptr_array pointer was too small
and was clobbering things next to it.

Note that procdata and procinfo are not currently contiguous, which
means if the kernel accesses them and they are more than one page long,
it is accessing random memory.

10 years agoRestored x86 compliation. Still unable to run under x86 due to no TLS
Paul Pearce [Wed, 6 Jan 2010 04:38:52 +0000 (23:38 -0500)]
Restored x86 compliation. Still unable to run under x86 due to no TLS

This commit provides various fixes, including several stubs, needed to allow
ROS to build for x86. Most of these stubs are syscalls that newlib_backend
needs to handle. I haven't decided how we should support these syscalls. Our
options are to either ship them off over the serial/network link to the
syscall server, or handle them locally.

There is an additional stub in trap.h to handle the setting of errno's
with respect to syscalls. We need to figure out how we wish to handle

NOTE: Although this compiles, attempting to run this under x86 will
result in a page fault durin proc_run. This is a result of the lack
of any thread local store support on the x86 side. Paul plans to
take a look at adding x86 tls support, next.

10 years agoonly link in roslib for i386
Andrew Waterman [Sun, 3 Jan 2010 20:41:06 +0000 (12:41 -0800)]
only link in roslib for i386

10 years agoAdded fork, exec, wait
Andrew Waterman [Sun, 3 Jan 2010 01:10:34 +0000 (17:10 -0800)]
Added fork, exec, wait

This probably deserves more explanation than I'll give here,
but here's the skinny: fork is a naive implementation that
doesn't work with mmap'd pages and doesn't use copy-on-write.

exec still takes a binary blob as an argument, like run_binary,
but unlike run_binary, it overwrites the calling process.

wait relies on a new process field called exitcode, which is
set by sys_proc_destroy() (therefore on exit()).

also added ppid to procinfo.

10 years agoinlined get_page_color
Andrew Waterman [Sun, 3 Jan 2010 01:08:17 +0000 (17:08 -0800)]
inlined get_page_color

10 years agoChanged argc/argv/envp ABI
Andrew Waterman [Sun, 3 Jan 2010 01:07:51 +0000 (17:07 -0800)]
Changed argc/argv/envp ABI

10 years agoAdded process list (ps) to monitor
Andrew Waterman [Sun, 3 Jan 2010 01:07:11 +0000 (17:07 -0800)]
Added process list (ps) to monitor

10 years agoReduced boot time
Andrew Waterman [Sun, 3 Jan 2010 01:05:23 +0000 (17:05 -0800)]
Reduced boot time

Most boot time is spent adding pages to the free list.
I inlined the function to determine the page color, and
added the assumption that there is a power of two number
of colors (true for all commercial processor caches).

10 years agoEnabled reading performance counters in user space
Andrew Waterman [Sun, 3 Jan 2010 01:03:03 +0000 (17:03 -0800)]
Enabled reading performance counters in user space

I used a fast-trap (user trap 0x89) rather than a full syscall

10 years agoAdded errno support
Andrew Waterman [Sun, 3 Jan 2010 01:02:07 +0000 (17:02 -0800)]
Added errno support

10 years agoMerged proc_init_trapframe and proc_init_trapframe_vcoreid
Andrew Waterman [Sun, 3 Jan 2010 00:49:54 +0000 (16:49 -0800)]
Merged proc_init_trapframe and proc_init_trapframe_vcoreid

10 years agoReduced SPARC kernel binary size
Andrew Waterman [Sun, 3 Jan 2010 00:48:05 +0000 (16:48 -0800)]
Reduced SPARC kernel binary size

Moved page tables out of .data into .bss

10 years agoAdded compile option to link in fewer binaries
Andrew Waterman [Sun, 3 Jan 2010 00:44:40 +0000 (16:44 -0800)]
Added compile option to link in fewer binaries

-DMINIMAL_KFS will only link in matrix (the shell)

10 years agomade augment-gcc less stupid
Andrew Waterman [Sun, 3 Jan 2010 00:43:22 +0000 (16:43 -0800)]
made augment-gcc less stupid

10 years agoAdded more syscalls
Andrew Waterman [Sun, 3 Jan 2010 00:42:39 +0000 (16:42 -0800)]
Added more syscalls

Also some ABI changes (TLS, argv, etc)

10 years agoGot the kernel's nose out of cmdline args
Andrew Waterman [Mon, 21 Dec 2009 05:40:51 +0000 (21:40 -0800)]
Got the kernel's nose out of cmdline args

10 years agofixed makefile error if no ivycc
Andrew Waterman [Mon, 21 Dec 2009 02:57:47 +0000 (18:57 -0800)]
fixed makefile error if no ivycc

10 years agoFixed run_binary and SPARC processes
Andrew Waterman [Wed, 16 Dec 2009 21:11:45 +0000 (13:11 -0800)]
Fixed run_binary and SPARC processes

10 years agoSynced up SPARC port
Andrew Waterman [Wed, 16 Dec 2009 03:52:25 +0000 (19:52 -0800)]
Synced up SPARC port

10 years agoRevised system call forwarding for multiple processes
Andrew Waterman [Wed, 16 Dec 2009 03:19:24 +0000 (19:19 -0800)]
Revised system call forwarding for multiple processes

Added arch-specific process init/destroy hooks
Moved some system call forwarding code to user space

10 years agoMerge remote branch 'origin/sparc-dev'
Barret Rhoden [Thu, 3 Dec 2009 03:14:54 +0000 (19:14 -0800)]
Merge remote branch 'origin/sparc-dev'

Still a few outstanding issues, like fully merging roslib into parlib
and sorting brk() and mmap().


11 years agoProcess reference counting
Barret Rhoden [Tue, 1 Dec 2009 07:28:11 +0000 (23:28 -0800)]
Process reference counting

This sorts out reference counting of processes.  This will keep
processes from dying while pointers are still floating around, among
other things.  Read the section in Documentation/process-internals.txt
for specifics and before you do anything that fundamentally messes with

There are still many outstanding issues: using atomics to properly
handle the reference counting (currently using the proc_lock, which has
issues), splitting core_request() up, and stacks getting annihilated
while holding references.

11 years agosped up run binary... realloc sux
Andrew Waterman [Tue, 1 Dec 2009 04:45:29 +0000 (20:45 -0800)]
sped up run binary... realloc sux

11 years agoreboot syscall added
Andrew Waterman [Tue, 1 Dec 2009 04:43:48 +0000 (20:43 -0800)]
reboot syscall added

11 years agofrontend-link code quality improvements
Andrew Waterman [Tue, 1 Dec 2009 04:32:51 +0000 (20:32 -0800)]
frontend-link code quality improvements

11 years agocleaned up harts stack allocation
Andrew Waterman [Tue, 1 Dec 2009 04:32:24 +0000 (20:32 -0800)]
cleaned up harts stack allocation

11 years agoadded reboot syscall
Andrew Waterman [Tue, 1 Dec 2009 04:31:21 +0000 (20:31 -0800)]
added reboot syscall

11 years agofixed bad spacing
Andrew Waterman [Tue, 1 Dec 2009 04:29:43 +0000 (20:29 -0800)]
fixed bad spacing

11 years agoMerge branch 'sparc-dev' of ssh://scm.millennium.berkeley.edu/project/cs/radlab/src...
Kevin Klues [Tue, 1 Dec 2009 04:27:53 +0000 (20:27 -0800)]
Merge branch 'sparc-dev' of ssh://scm.millennium.berkeley.edu/project/cs/radlab/src/parlab/ros into sparc-dev

11 years agoAdded stubs for additional newlib system calls
Kevin Klues [Tue, 1 Dec 2009 04:27:45 +0000 (20:27 -0800)]
Added stubs for additional newlib system calls

11 years agoGCC augmentation fixes
Andrew Waterman [Tue, 1 Dec 2009 04:24:26 +0000 (20:24 -0800)]
GCC augmentation fixes

11 years agoFixed GCC augmentation script
Andrew Waterman [Tue, 1 Dec 2009 04:22:40 +0000 (20:22 -0800)]
Fixed GCC augmentation script

11 years agoFixed some infrastructure stuff related to our crosscompilers
Kevin Klues [Mon, 30 Nov 2009 09:52:12 +0000 (01:52 -0800)]
Fixed some infrastructure stuff related to our crosscompilers

11 years agoTLS works in SPARC
Andrew Waterman [Mon, 30 Nov 2009 11:28:51 +0000 (03:28 -0800)]
TLS works in SPARC

11 years agoMakefile support for sparc-ros-gcc
Andrew Waterman [Mon, 30 Nov 2009 04:47:23 +0000 (20:47 -0800)]
Makefile support for sparc-ros-gcc

11 years agofixed pedantic gcc warning
Andrew Waterman [Mon, 30 Nov 2009 04:21:11 +0000 (20:21 -0800)]
fixed pedantic gcc warning

11 years agoExtern'd some harts functions
Andrew Waterman [Mon, 30 Nov 2009 04:20:25 +0000 (20:20 -0800)]
Extern'd some harts functions

11 years agoAdded external user binary support (usrbin/)
Andrew Waterman [Wed, 25 Nov 2009 00:17:22 +0000 (16:17 -0800)]
Added external user binary support (usrbin/)

Also some misc SPARC changes and minor harts change

11 years agochanged harts interface for proxykernel compat
Andrew Waterman [Tue, 24 Nov 2009 23:38:05 +0000 (15:38 -0800)]
changed harts interface for proxykernel compat

11 years agoManually spin_unlock_irqsave and a cleaner destroy
Barret Rhoden [Fri, 13 Nov 2009 00:18:57 +0000 (16:18 -0800)]
Manually spin_unlock_irqsave and a cleaner destroy

proc_destroy is no longer ghetto when it comes to decrefing, which will
help in some future commits regarding refcnts and atomic operations on
those refcnts.

11 years agoremoved user envp to fix link problems
Andrew Waterman [Wed, 11 Nov 2009 04:35:45 +0000 (20:35 -0800)]
removed user envp to fix link problems

11 years agofixed pthread_barrier_wait bug
Andrew Waterman [Wed, 11 Nov 2009 04:35:19 +0000 (20:35 -0800)]
fixed pthread_barrier_wait bug

11 years agoimproved code quality for C++ static constructor calls
Andrew Waterman [Wed, 11 Nov 2009 04:34:24 +0000 (20:34 -0800)]
improved code quality for C++ static constructor calls

11 years agoProc data structure management, env gutting
Barret Rhoden [Mon, 9 Nov 2009 19:03:11 +0000 (11:03 -0800)]
Proc data structure management, env gutting

Got rid of the static envs, uses a kmem_cache for allocating procs,
added better pid management, refactored old envs code.

There's a couple races, one on deschedule(), and another issue in
general with refcnting on any pointer acquisition.  See the comments in
__proc_free() if you're curious.

11 years agoHash table changes
Barret Rhoden [Sat, 7 Nov 2009 01:33:47 +0000 (17:33 -0800)]
Hash table changes

Changed how the hash table works, most notably that you must free your
keys on your own.  This way, you can either kfree, kmem_cache_free, or
just nothing, based on whatever is appropriate for what your key is.
(Just an int requires no freeing, but still requires a typecast).

This is a good example of packaged solutions being non-ideal, since they
make assumptions about its usage (kfree, let alone that the key is an
obkect).  I nearly ripped out the function pointers for hashing and
equality, in favor of the hashed value being passed to functions (where
needed), and the key just being a long.  It simplifies a lot and would
perform better, and I don't have an example of when I want an object for
a key where equivalence isn't the address of the object.  There may be a
case where the function pointers are nice, so I held off.

There are also generic functions for the hashfn and eqfn.  Don't call
these directly, etc.  Also, the hash entries (hentry) are now slab
allocated, instead of kmalloc'd.

NB: be warned that there is no checking for duplicate keys.

Also, another way to do these things is to embed the hash_entry in any
struct that will be hashed (like the struct proc).  You won't need
dynamic allocation of the hentry, you can check if you are hashed or
not, and the hentry doesn't need a pointer to you (can do something like
container_of()).  A downside is that concurrency can be weird - others
could temp touch your entry while walking a hash chain.  Not sure what's
best, overall.