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powerpc/mm: dump segment registers on book3s/32
This patch creates a debugfs file to see content of
segment registers
# cat /sys/kernel/debug/segment_registers
---[ User Segments ]---
0x00000000-0x0fffffff Kern key 1 User key 1 VSID 0xade2b0
0x10000000-0x1fffffff Kern key 1 User key 1 VSID 0xade3c1
0x20000000-0x2fffffff Kern key 1 User key 1 VSID 0xade4d2
0x30000000-0x3fffffff Kern key 1 User key 1 VSID 0xade5e3
0x40000000-0x4fffffff Kern key 1 User key 1 VSID 0xade6f4
0x50000000-0x5fffffff Kern key 1 User key 1 VSID 0xade805
0x60000000-0x6fffffff Kern key 1 User key 1 VSID 0xade916
0x70000000-0x7fffffff Kern key 1 User key 1 VSID 0xadea27
0x80000000-0x8fffffff Kern key 1 User key 1 VSID 0xadeb38
0x90000000-0x9fffffff Kern key 1 User key 1 VSID 0xadec49
0xa0000000-0xafffffff Kern key 1 User key 1 VSID 0xaded5a
0xb0000000-0xbfffffff Kern key 1 User key 1 VSID 0xadee6b
---[ Kernel Segments ]---
0xc0000000-0xcfffffff Kern key 0 User key 1 VSID 0x000ccc
0xd0000000-0xdfffffff Kern key 0 User key 1 VSID 0x000ddd
0xe0000000-0xefffffff Kern key 0 User key 1 VSID 0x000eee
0xf0000000-0xffffffff Kern key 0 User key 1 VSID 0x000fff
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: Move it under /sys/kernel/debug/powerpc, make sr_init() __init]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>