respond to MSG_GLOBAL_REQUEST with MSG_REQUEST_FAILURE
as stated by rfc4254 when server wants a reply.
failing todo so breaks some proprietary keep-alive schemes.
coproc.c generated the instrucitons anew each time,
requiering a i+d cache flush for each operation.
instead, we can speed this up like this:
given that the coprocessor registers are per cpu, we can
assume that interrupts have already been disabled by
the caller to prevent a process switch to another cpu.
we cache the instructions generated in a static append
only buffer and maintain separate end pointers for each
cpu.
the cache flushes only need to be done when new
operations have been added to the buffer.
- make frame base pointer variable
- in rwreg(), save/restore the interpreter state and allocate a Frame* on the stack
- add overflow checks for frame base pointer to xec() and amleval()
- gc() scans the whole stack from FP to the *real* bottom F0
reference: https://github.com/raspberrypi/firmware/issues/542
procsave(Proc* p)
{
uvlong t;
cycles(&t);
p->pcycles += t;
// TODO: save and restore VFPv3 FP state once 5[cal] know the new registers.
fpuprocsave(p);
/*
* Prevent the following scenario:
* pX sleeps on cpuA, leaving its page tables in mmul1
* pX wakes up on cpuB, and exits, freeing its page tables
* pY on cpuB allocates a freed page table page and overwrites with data
* cpuA takes an interrupt, and is now running with bad page tables
* In theory this shouldn't hurt because only user address space tables
* are affected, and mmuswitch will clear mmul1 before a user process is
* dispatched. But empirically it correlates with weird problems, eg
* resetting of the core clock at 0x4000001C which confuses local timers.
*/
if(conf.nmach > 1)
mmuswitch(nil);
}
- clean dcache before turning off caches and mmu (rebootcode.s)
- use WFE and inter-core mailboxes for cpu startup (rebootcode.s)
- disable SMP during dcache invalidation before enabling caches and mmu (in armv7.s)
- synchronize rebootcode installation
- handle the 1MB identity map in mmu.c (mmuinit1())
- do not overlap CONFADDR with rebootcode, the non boot
processors are parked there.
- make REBOOTADDR physical address
- disable local clock on interrupt to prevent accidents when reenabling
- always regitster local clock interrupt handler, even for cpu0
- simplify microdelay()
- don't mess with watchdog
revert last change, which used games/wadfs to expose genmidi and music lumps.
replacements from patch wads were never seen that way. instead, write genmidi
and music lumps to /tmp and play them from there.
