Virtual address spaces per architecture

amd64

48-bit VAS

0xffff800000000000	128TiB	kernel non-identity
0x0000800000000000	16776960TiB	VA hole
0x0000000000000000	128TiB	kernel non-identity

mips32

0xe0000000	512MiB		kernel non-identity	kseg3
0xc0000000	512MiB	kernel non-identity	ksseg
0xa0000000	512MiB	spec	kseg1	(maps to physical 0 uncached)
0x80000000	512MiB	kernel identity	kseg0	(maps to physical 0 cacheable)
0x00000000	2GiB	uspace non-identity	kuseg

sparc64

UltraSPARC I, II, IIi

44-bit VAS

0xfffff80000000000	8TiB	kernel non-identity
0x0000080000000000	16777200TiB	VA hole	no code within 4GiB reach of the VA hole on I and II
0x0000000000000000	8TiB	kernel non-identity

UltraSPARC III, IIIi, IV and IV+

64-bit VAS

0x0000000000000000

16EiB

kernel non-identity

UltraSPARC T1, T2

48-bit VAS

0xffff800000000000	128TiB	kernel non-identity
0x0000800000000000	16776960TiB	VA hole	no code within 4GiB reach of the VA hole on T1, no code below 8KiB on T2
0x0000000000000000	128TiB	kernel non-identity