mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 10:20:49 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
25 lines
960 B
Plaintext
25 lines
960 B
Plaintext
|
|
<previous description obsolete, deleted>
|
|
|
|
Virtual memory map with 4 level page tables:
|
|
|
|
0000000000000000 - 00007fffffffffff (=47bits) user space, different per mm
|
|
hole caused by [48:63] sign extension
|
|
ffff800000000000 - ffff80ffffffffff (=40bits) guard hole
|
|
ffff810000000000 - ffffc0ffffffffff (=46bits) direct mapping of phys. memory
|
|
ffffc10000000000 - ffffc1ffffffffff (=40bits) hole
|
|
ffffc20000000000 - ffffe1ffffffffff (=45bits) vmalloc/ioremap space
|
|
... unused hole ...
|
|
ffffffff80000000 - ffffffff82800000 (=40MB) kernel text mapping, from phys 0
|
|
... unused hole ...
|
|
ffffffff88000000 - fffffffffff00000 (=1919MB) module mapping space
|
|
|
|
vmalloc space is lazily synchronized into the different PML4 pages of
|
|
the processes using the page fault handler, with init_level4_pgt as
|
|
reference.
|
|
|
|
Current X86-64 implementations only support 40 bit of address space,
|
|
but we support upto 46bits. This expands into MBZ space in the page tables.
|
|
|
|
-Andi Kleen, Jul 2004
|