to the current pcb.
Remove interrupt global defines; they use PCPU_REG now.
Move ATOMIC_INC_INT here from exception.s, add ATOMIC_DEC_INT.
Add a KASSERT macro for use in assembler.
substantial fraction of the number of entries of tte's in the tsb
would need to be looked up, traverse the tsb instead. This is crucial
in some places, e.g. when swapping out a process, where a certain
pmap_remove() call would take very long time to complete without this.
2. Implement pmap_qenter_flags(), which will become used later
3. Reactivate the instruction cache flush done when mapping as executable.
This is required e.g. when executing files via NFS, but is known to
cause problems on UltraSPARC-IIe CPU's. If you have such a CPU, you
will need to comment this call out for now.
Submitted by: jake (3)
struct ofw_nexus_reg. Implement UPA device memory management in the
nexus driver.
Adapt the psycho driver to these changes, and do some minor cleanup work
while being there.
for certain user pages, stores to kernel pages would not update the
affected cache lines, which would sometimes cause the wrong data to be
returned for loads from kernel pages. This was especially fatal when
the addresses affected held the kernel stack pointer, and a random
value was loaded into it.
Fix a harmless off by one error in a dcache_inval_phys call.
Fix a potential race in setting up the per-cpu pointer if the special
restore fails on return to user mode fails and we need to trap back
into the kernel to fault in more stack.
Remove debug code.
an efficient way for the kernel to bounce certain mundane traps back to
userland for handling there. A user trap handler returns directly to the
trapping user code, rather than going through the kernel again. Only a
handful of instructions are actually executed in kernel mode.
Implement sysarch(SPARC_UTRAP_INSTALL).
Add code to handle sharing of the user trap table across forks and unsharing
at exec.
This can be used to implement efficient tracking of floating point register
usage in userland, fe by a thread library, and to handle alignment fault
fixups and instruction emulation in userland, for which the code may need
to be different for 32bit and 64bit binaries.
something wrong with the kernel stack.
Add code to check the kernel stack pointer in various important places
and try hard not to go down in flames if its wrong.
Add fields to md_page for tracking virtual page color, and pv entry
lists.
Fix pmap_track_modified to work for non-kernel pmaps. This is due to
kernel virtual addresses potentially overlapping with userland addresses.
much less magic, fragile, broken. Use ttes rather than sttes.
We still use the replacement scheme used by the original code, which
is pretty cool.
Many crucial bug fixes from: tmm
of sttes. Also removes many differences between this and the other pmaps.
Reserve the kva space used by the openfirmware translations.
Use physical addresses directly in pmap_zero_page and pmap_copy_page, now
that we have the cache line shooting support.
Add code to track the virtual cachability of mapped pages. The dmmu
requires that multiple mappings of the same phsyical address have the
save virtual address bits up to a colour boundary. Violating this
requires all mappings to be mapped uncacheable. We do not yet handle
the case of a badly aliased mapping becoming cachable again.
Many crucial bug fixes from: tmm
the registers so we don't uselessly save them over and over again for
each context switch until another floating point instruction is executed.
Use a non-specific tlb slot for the tsb, which needs to have a locked
entry.
Remove overly verbose traces.
Add macros to atomically increment an integer variable in the data
section and to atomically set a bit in a tte. Note that the latter
does not return the new value.
Rewrite RESUME_SPILLFILL_MAGIC to use more sensical calculations, and
to preserve all alternate globals religiously. Must now be called on
alternate globals.
Defer switching to the kernel stack until inside the syscall, trap,
interrupt wrappers. Splitting the windows is all that's really urgent.
Adapt to new trap types.
Add %xcc where appropriate in order to not use v8 opcodes inadvertantly
(which work fine).
Modify the low level tlb fault handlers to operate on a tsb made up of
ttes, not sttes. This effectively makes the tsb twice as large.
After atomically updating tte bits in memory, also set the bit in the
register that holds the data which will be loaded into the tlb. The
macro returns the old value.
Use the preloaded mmu global which holds the address of the current
user tsb.
Add back a low level protection fault handler instead of just punting
into the vm system. This effectively saves a soft fault per COW fault.
Add a trace to intr_enqueue.
Pass arguments to the trap, interrupt, syscall wrappers in the out
registers instead of some on the stack, some in registers.
Use the preloaded alternate global pcb register.
2. Make trap_pfault more like it is on other architectures.
3. Fix a bug in syscall() which caused system calls with more than
six arguments that are called through the wild card syscall to
have their arguments scrambled. This affected mmap due to the
(bogus) wrapper in libc.
Submitted by: tmm (3)
Add some traces that can be useful but are also very loud.
Use defines for offsets into jmpbuf instead of magic numbers.
Fix a style bug.
Fixup comments.
specified by the sparc abi. We use numerically higher values for all
internal kernel types.
Remove soft trap types which need to be exposed to userland. They will
move to utrap.h.
their duration. This is still only effective as long as they are
only used in the static kernel. Code in modules may cause instruction
faults which makes these break in different ways anyway.
2. Add a load bearing membar #Sync.
3. Add an inline for demapping an entire context.
Submitted by: tmm (1, 2)
Bloat trapframe with many extra fields so we don't need extra structures.
Use small data types where possible.
Remove second copy of TF_DONE.
Remove mmuframe.
- The MD functions critical_enter/exit are renamed to start with a cpu_
prefix.
- MI wrapper functions critical_enter/exit maintain a per-thread nesting
count and a per-thread critical section saved state set when entering
a critical section while at nesting level 0 and restored when exiting
to nesting level 0. This moves the saved state out of spin mutexes so
that interlocking spin mutexes works properly.
- Most low-level MD code that used critical_enter/exit now use
cpu_critical_enter/exit. MI code such as device drivers and spin
mutexes use the MI wrappers. Note that since the MI wrappers store
the state in the current thread, they do not have any return values or
arguments.
- mtx_intr_enable() is replaced with a constant CRITICAL_FORK which is
assigned to curthread->td_savecrit during fork_exit().
Tested on: i386, alpha
- The MI portions of struct globaldata have been consolidated into a MI
struct pcpu. The MD per-CPU data are specified via a macro defined in
machine/pcpu.h. A macro was chosen over a struct mdpcpu so that the
interface would be cleaner (PCPU_GET(my_md_field) vs.
PCPU_GET(md.md_my_md_field)).
- All references to globaldata are changed to pcpu instead. In a UP kernel,
this data was stored as global variables which is where the original name
came from. In an SMP world this data is per-CPU and ideally private to each
CPU outside of the context of debuggers. This also included combining
machine/globaldata.h and machine/globals.h into machine/pcpu.h.
- The pointer to the thread using the FPU on i386 was renamed from
npxthread to fpcurthread to be identical with other architectures.
- Make the show pcpu ddb command MI with a MD callout to display MD
fields.
- The globaldata_register() function was renamed to pcpu_init() and now
init's MI fields of a struct pcpu in addition to registering it with
the internal array and list.
- A pcpu_destroy() function was added to remove a struct pcpu from the
internal array and list.
Tested on: alpha, i386
Reviewed by: peter, jake
o Hide nonstandard functions and types in <netinet/in.h> when
_POSIX_SOURCE is defined.
o Add some missing types (required by POSIX.1-200x) to <netinet/in.h>.
o Restore vendor ID from Rev 1.1 in <netinet/in.h> and make use of new
__FBSDID() macro.
o Fix some miscellaneous issues in <arpa/inet.h>.
o Correct final argument for the inet_ntop() function (POSIX.1-200x).
o Get rid of the namespace pollution from <sys/types.h> in
<arpa/inet.h>.
Reviewed by: fenner
Partially submitted by: bde
in asm files.
2. Temporarily cause subnormal operands in floating point operations
to be treated as zeros so that comlpetion of the operation does not
need to be emulated.
3. Catch fp_exception_other and correctly skip over the unfinished
instruction, but basically ignore them. Emulating the instruction
is not yet supported.
4. Zero td_retval[1] as well in syscall().
Submitted by: tmm (2, 3)
2. Add a TF_DONE macro, which fiddles a trapframe to make the retry on
return from traps act like a done (advance past the trapping
instruction instead of re-executing).
3. Flush the windows before entering the debugger, since it is no
longer done in the breakpoint trap vector.
4. Print a warning if trace <pid> is attempted, it is not yet implemented.
5. Print traps better and decode system calls in traces.
Submitted by: rwatson (4)
to determine if a process is using floating point. in order to avoid
sign extending a 13 bit immediate.
2. We don't need to context switch cwp anymore, it is better to just
fiddle the save tstate on return from traps. See exception.s 1.10
and 1.12.
3. Completely remove pcb_cwp.
4. Implement vmapbuf, vunmapbuf and vm_fault_quick. Completely remove
TODOs from vm_machdep.c (yay!).
Submitted by: tmm (1, 3, 4)
Obtained from: existing archs (4)
space from kernel space and from an alternate address space to kernel
space.
2. Remove the unused and unprototyped physcopy() and physzero() and replace
with the more versatile ascopy() and aszero(), inspired by the above.
These can be used to copy and zero physical pages of memory without mapping
them into kernel space first.
3. Use magic numbers for the offsets in the jmpbuf structure like other
platforms.
4. Use SET.
Submitted by: tmm (1, 4)
in the window trap vectors were mixed up. All this did is cause unnecesary
traps and look wierd in traces. Superfluous traps happen a lot in normal
operation, so we are rather good at recovering from them.
2. Store the arguments for a ktr trace in the right place.
3. Use a generic trap vector for breakpoints. It should not be special.
4. Save the frame pointer in the trap frame for kernel traps if DDB is compiled
in, otherwsie we don't save the out registers for kernel traps and stack
traces can't go through nested traps.
5. Apply the same fix to the return from kernel mode trap code as for user
mode traps. Ensure that the window we're returning to is the same one
that we restore to by fiddling the cwp in the saved tstate. This requires
that we transfer the values loaded from the trap frame into alternate
globals before restore-ing, but doing so is not very expensive and not
worth worrying about. Not changing the saved cwp can result in the register
values magically changing on return from traps if we happen to have slept
and the windows don't work out exactly the same. Fix the trace just before
the retry to account for different register usage.
6. Use a SET macro for loading address constants rather than a variation of
set and setx. set only works for 32 bit constants, while setx works for
64 bit constants as well, but produces bloated code when unnecessary.
Gas always generates the canonical 2 register, 6 instruction form, even
when it could be optimized; set uses 1 register and 2 instructions. At
the moment we assume that the kernel binary is below 4GB so set is
always sufficient, but the macro allows it to be configured. Note that
this has nothing to do with 32 vs. 64 bit address space, it only applies
to addresses of symbols which are known at compile/link time.
Submitted by: tmm (6)
