x86/x86_64/mm.rst

13    from the top of the 64-bit address space. It's easier to understand the layout
17    64-bit address space (ffffffffffffffff).
20    from TB to GB and then MB/KB.
24    It also shows it nicely how incredibly large 64-bit address space is.
35 …0000800000000000 | +128    TB | ffff7fffffffffff | ~16M TB | ... huge, almost 64 bits wide hole of…
45 …ffff888000000000 | -119.5  TB | ffffc87fffffffff |   64 TB | direct mapping of all physical memory…
63    ffffffef00000000 |  -68    GB | fffffffeffffffff |   64 GB | EFI region mapping space
65 …ffffffff80000000 |   -2    GB | ffffffff9fffffff |  512 MB | kernel text mapping, mapped to physic…
66    ffffffff80000000 |-2048    MB |                  |         |
67    ffffffffa0000000 |-1536    MB | fffffffffeffffff | 1520 MB | module mapping space
68    ffffffffff000000 |  -16    MB |                  |         |
69 …FIXADDR_START | ~-11    MB | ffffffffff5fffff | ~0.5 MB | kernel-internal fixmap range, variable s…
70    ffffffffff600000 |  -10    MB | ffffffffff600fff |    4 kB | legacy vsyscall ABI
71    ffffffffffe00000 |   -2    MB | ffffffffffffffff |    2 MB | ... unused hole
81    from 0.125 PB to 64 PB. All kernel mappings shift down to the -64 PB starting
91 …0000000000000000 |    0       | 00ffffffffffffff |   64 PB | user-space virtual memory, different …
94 …0100000000000000 |  +64    PB | feffffffffffffff | ~16K PB | ... huge, still almost 64 bits wide h…
95 …          |            |                  |         |     virtual memory addresses up to the -64 PB
102 …ff00000000000000 |  -64    PB | ff0fffffffffffff |    4 PB | ... guard hole, also reserved for hyp…
122    ffffffef00000000 |  -68    GB | fffffffeffffffff |   64 GB | EFI region mapping space
124 …ffffffff80000000 |   -2    GB | ffffffff9fffffff |  512 MB | kernel text mapping, mapped to physic…
125    ffffffff80000000 |-2048    MB |                  |         |
126    ffffffffa0000000 |-1536    MB | fffffffffeffffff | 1520 MB | module mapping space
127    ffffffffff000000 |  -16    MB |                  |         |
128 …FIXADDR_START | ~-11    MB | ffffffffff5fffff | ~0.5 MB | kernel-internal fixmap range, variable s…
129    ffffffffff600000 |  -10    MB | ffffffffff600fff |    4 kB | legacy vsyscall ABI
130    ffffffffffe00000 |   -2    MB | ffffffffffffffff |    2 MB | ... unused hole
133 Architecture defines a 64-bit virtual address. Implementations can support
143 We map EFI runtime services in the 'efi_pgd' PGD in a 64GB large virtual
156 For both 4- and 5-level layouts, the STACKLEAK_POISON value in the last 2MB