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Linux kernel release 2.3.xx for the IA-64 Platform
These are the release notes for Linux version 2.3 for IA-64
platform. This document provides information specific to IA-64
ONLY, to get additional information about the Linux kernel also
read the original Linux README provided with the kernel.
INSTALLING the kernel:
- IA-64 kernel installation is the same as the other platforms, see
original README for details.
SOFTWARE REQUIREMENTS
Compiling and running this kernel requires an IA-64 compliant GCC
compiler. And various software packages also compiled with an
IA-64 compliant GCC compiler.
CONFIGURING the kernel:
Configuration is the same, see original README for details.
COMPILING the kernel:
- Compiling this kernel doesn't differ from other platform so read
the original README for details BUT make sure you have an IA-64
compliant GCC compiler.
IA-64 SPECIFICS
- Security related issues:
o mmap needs to check whether mapping would overlap with the
address-space hole in a region or whether the mapping would be
across regions. In both cases, mmap should fail.
o ptrace is a huge security hole right now as it does not reject
writing to security sensitive bits (such as the PSR!).
- General issues:
o Kernel modules aren't supported yet.
o For non-RT signals, siginfo isn't passed through from the kernel
to the point where the signal is actually delivered. Also, we
should make sure the siginfo data is compliant with the UNIX
ABI.
o Hardly any performance tuning has been done. Obvious targets
include the library routines (memcpy, IP checksum, etc.). Less
obvious targets include making sure we don't flush the TLB
needlessly, etc. Also, the TLB handlers should probably try to
do a speculative load from the virtually mapped linear page
table and only if that fails fall back on walking the page table
tree.
o Discontigous large memory support; memory above 4GB will be
discontigous since the 4GB-64MB is reserved for firmware and I/O
space.
o Correct mapping for PAL runtime code; PAL code needs to be
mapped by a TR.
o Make current IRQ/IOSAPIC handling closer to IA32 such as,
disable/enable interrupts, use of INPROGRESS flag etc.
o clone system call implementation; needs to setup proper backing
store
o SMP locks cleanup/optimization
o IA32 support. Currently experimental. It mostly works but
there are problems with some dynamically loaded programs.
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