- make IPI takes two arguments.
- add IPI event counters per-CPU.
- implement IPI functions which were missing or broken.
- insert DELAY while halting primary CPU in IPI handler.
This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.
TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.
NOTES:
pmppc was removed as an arch, and moved to a evbppc target.
from doc/BRANCHES:
idle lwp, and some changes depending on it.
1. separate context switching and thread scheduling.
(cf. gmcgarry_ctxsw)
2. implement idle lwp.
3. clean up related MD/MI interfaces.
4. make scheduler(s) modular.
is still not working.)
cpu.h:
- add a pointer for DDB regs in SMP environment to struct cpu_info
- remove the #defines for mp_pause_cpus() and mp_resume_cpus()
cpuset.h:
- remove CPUSET_ALL() and rename CPUSET_ALL_BUT() to CPUSET_EXCEPT()
from petrov.
db_machdep.h:
- rename the members of db_regs_t to be the same as sparc
- change "db_regs_t ddb_regs" to "db_regs_t *ddb_regp" and change
all references to suit
- redo DDB_REGS to no longer be a pointer to a fixed data structure
but to one allocated per-cpu when ddb is entered
- move a bunch of prototypes in here
intr.h:
- remove SPARC64_IPI_* macros, no longer used
db_interface.c:
- change "db_regs_t ddb_regs" to "db_regs_t *ddb_regp" and change
all references to suit
- make "nil" a 64 bit entity
- change the ddb register access methods to work in multiprocessor
environment, it is now very much like sparc does it
- in kdb_trap() avoid accessing ddb_regp when it is NULL
- update several messages to include the cpu number
- unpause other cpus much later when resuming from ddb
- rename db_lock() to db_lock_cmd(), as the sparc-like code has
db_lock as a simple lock
- remove "mach cpus" command, and replace it with "mach cpu" (which
does the same) and also implement "mach cpu N" to switch to
another cpus saved trapframe
db_trace.c:
- update for the ddb_regs -> ddb_regp change
genassym.cf:
- add TF_KSTACK as offsetof(struct trapframe64, tf_kstack)
ipifuncs.c:
- overhaul extensively
- remove all normal interrupt handlers as IPI's, we now handle
them all specially in locore.s:interrupt_vector
- add a simplelock around all ipi functions - it's not safe for
multiple cpus to be sending IPI's to each other right now
- rename sparc64_ipi_pause() to sparc64_ipi_pause_thiscpu() and,
if DDB is configured, enable it to save the passed-in trapframe
to a db_regs_t for this cpu's saved DDB registers.
- remove the "ipimask" system (SPARC64_IPI_* macros) and instead
pass functions directly
- in sparc64_send_ipi() always set the interrupt arguments to 0,
the address and argument of the to be called function. (the
argument right now is the address of ipi_tlb_args variable, and
part of the reason why only one CPU can send IPI's at a time.)
don't wait forever for an IPI to complete. some of this is
from petrov.
- rename sparc64_ipi_{halt,pause,resume}_cpus() to
mp_{halt,pause,resume}_cpus()
- new function mp_cpu_is_paused() used to avoid access missing
saved DDB registers
- actually broadcast the flush in smp_tlb_flush_pte(),
smp_tlb_flush_ctx() and smp_tlb_flush_all(). the other end may
not do anything yet in the pte/ctx cases yet...
kgdb_machdep.c:
- rework for changed member names in db_regs_t.
locore.s:
- shave an instruction from syscall_setup() (set + ld -> sethi + ld)
- remove some old dead debug code
- add new sparc64_ipi_halt IPI entry point, it just calls the C
vector to shutdown.
- add new sparc64_ipi_pause IPI entry point, which just traps into
the debugger using the normal breakpoint trap. these cpus usually
lose the race in db_interface.c:db_suspend_others() and end up
calling the C vector sparc64_ipi_pause_thiscpu().
- add #if 0'ed code to sparc64_ipi_flush_{pte,ctx}() IPI entry
points to call the sp_ version of these functions.
- in rft_kernel (return from trap, kernel), check to see if the
%tpc is at the sparc64_ipi_pause_trap_point and if so, call
"done" not "retry"
- rework cpu_switch slightly: save the passed-in lwp instead of
using the one in curlwp
- in cpu_loadproc(), save the new lwp not the old lwp, to curlwp
- in cpu_initialize(), set %tl to zero as well. from petrov.
- in cpu_exit(), fix a load register confusion. from petrov.
- change some "set" in delay branch to "mov".
machdep.c:
- deal with function renames
pmap.c:
- remove a spurious space
trap.c:
- remove unused "trapstats" variable
- add cpu number to a couple of messages
- Accept bootinfo structure passed down from ofwboot v1.9
- Drop kernel re-mapping code
- Use permanent 4MB mappings provided by the loader instead
- Change kernel entry address to point directly at the code instead of pointing
at the trap table's first slot. This allows the bootloader to detect
those kernels which are aware of the new boot scheme
- Due to the changes in kernel mapping code, alter secondary CPU bootstrap
code to use trampoline just like FreeBSD does (some FreeBSD code is used
here as well)
process context ('reaper').
From within the exiting process context:
* deactivate pmap and free vmspace while we can still block
* introduce MD cpu_lwp_free() - this cleans all MD-specific context (such
as FPU state), and is the last potentially blocking operation;
all of cpu_wait(), and most of cpu_exit(), is now folded into cpu_lwp_free()
* process is now immediatelly marked as zombie and made available for pickup
by parent; the remaining last lwp continues the exit as fully detached
* MI (rather than MD) code bumps uvmexp.swtch, cpu_exit() is now same
for both 'process' and 'lwp' exit
uvm_lwp_exit() is modified to never block; the u-area memory is now
always just linked to the list of available u-areas. Introduce (blocking)
uvm_uarea_drain(), which is called to release the excessive u-area memory;
this is called by parent within wait4(), or by pagedaemon on memory shortage.
uvm_uarea_free() is now private function within uvm_glue.c.
MD process/lwp exit code now always calls lwp_exit2() immediatelly after
switching away from the exiting lwp.
g/c now unneeded routines and variables, including the reaper kernel thread
This is derived from alpha/microtime.c and i386/tsc_microtime.c,
and will share with both ports.
This should fix PR port-sparc64/18452.
(approved by martin)
