Linux tries to maintain a neat distinction between hardware-dependent and hardware-independent source code. To that end, both the arch and the include directories include nine subdirectories that correspond to the nine hardware platforms supported. The standard names of the platforms are:
alpha
Hewlett-Packard's Alpha workstations
arm
ARM processor-based computers and embedded devices
cris
"Code Reduced Instruction Set" CPUs used by Axis in its thin-servers, such as web cameras or development boards
i386
IBM-compatible personal computers based on 80 x 86 microprocessors
ia64
Workstations based on Intel 64-bit Itanium microprocessor
m68k
Personal computers based on Motorola MC680 x 0 microprocessors
mips
Workstations based on MIPS microprocessors
mips64
Workstations based on 64-bit MIPS microprocessors
parisc
Workstations based on Hewlett Packard HP 9000 PA-RISC microprocessors
ppc
Workstations based on Motorola-IBM PowerPC microprocessors
s390
32-bit IBM ESA/390 and zSeries mainframes
s390 x
IBM 64-bit zSeries servers
sh
SuperH embedded computers developed jointly by Hitachi and STMicroelectronics
sparc
Workstations based on Sun Microsystems SPARC microprocessors
sparc64
Workstations based on Sun Microsystems 64-bit Ultra SPARC microprocessors