kernels, at the same time getting rid of up to 3 conditional branches and a
bit over one cacheline fetch (for the 68060; the saving is a bit smaller for
040 and yet smaller for the 020/30).
While we're here, also get rid of an redundant lea (using SP-relative
addressing) and of two redundant pushes.
While we're here, also fix a panic which would tear us down on 68060 machines
if a branch prediction error ever occured.
<horimoto@cs-aoi.cs.sist.ac.jp> in PR #3641. I changed the code slightly.
Instead of clearing 13 registers (d1-d7,a1-a6) and zeroing 512 bytes per
loop iteration, I clear 8 registers (d1-d7,a1) and zero 256 bytes. This
reduces the size and complexity of the function.
On the '020, the simpler code is less than 1% slower. Surprisingly, it
is ~3% faster on the '040.
- ENTRY_NOPROFILE() and ASENTRY_NOPROFILE(), similar to ENTRY() and
ASENTRY(), but without the profiling prologue.
- GLOBAL()/ASGLOBAL() and LOCAL()/ASLOCAL(), for defining global and
local variables with C and ASM labels.
- BSS()/ASBSS(), for defining items in the BSS segment, with C or
ASM labels.
- PANIC("panic message") - shorthand for calling panic() from assembly code.
- VECTOR(), ASVECTOR(), VECTOR_UNUSED - shorthand for defining entries
in the vector table.
Also, change RCSID() to pad out the string to even boundary.
Some of the stuff (e.g., rarpd, bootpd, dhcpd etc., libsa) still will
only support Ethernet. Tcpdump itself should be ok, but libpcap needs
lot of work.
For the detailed change history, look at the commit log entries for
the is-newarp branch.
area. These functions are designed to improve performance of large
copyin/copyout operations by mapping the user page in to the kernel
address space and using bcopy(), rather then copying across protection
boundaries.
XXX This doesn't work yet -- the way it's called doesn't obey C calling
XXX conventions. That will be fixed soon.
scottr