Lines Matching +full:risc +full:- +full:v
1 .. SPDX-License-Identifier: GPL-2.0
4 Virtual Memory Layout on RISC-V Linux
10 This document describes the virtual memory layout used by the RISC-V Linux
13 RISC-V Linux Kernel 32bit
16 RISC-V Linux Kernel SV32
17 ------------------------
21 RISC-V Linux Kernel 64bit
24 The RISC-V privileged architecture document states that the 64bit addresses
25 "must have bits 63–48 all equal to bit 47, or else a page-fault exception will
28 the RISC-V Linux Kernel resides.
30 RISC-V Linux Kernel SV39
31 ------------------------
39 …0000000000000000 | 0 | 0000003fffffffff | 256 GB | user-space virtual memory, different …
42 …000 | +256 GB | ffffffbfffffffff | ~16M TB | ... huge, almost 64 bits wide hole of non-canonical
43 … | | | | virtual memory addresses up to the -256 GB
47 … | Kernel-space virtual memory, shared between all processes:
50 ffffffc6fee00000 | -228 GB | ffffffc6feffffff | 2 MB | fixmap
51 ffffffc6ff000000 | -228 GB | ffffffc6ffffffff | 16 MB | PCI io
52 ffffffc700000000 | -228 GB | ffffffc7ffffffff | 4 GB | vmemmap
53 ffffffc800000000 | -224 GB | ffffffd7ffffffff | 64 GB | vmalloc/ioremap space
54 … ffffffd800000000 | -160 GB | fffffff6ffffffff | 124 GB | direct mapping of all physical memory
55 fffffff700000000 | -36 GB | fffffffeffffffff | 32 GB | kasan
61 ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF
62 ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel
66 RISC-V Linux Kernel SV48
67 ------------------------
75 …0000000000000000 | 0 | 00007fffffffffff | 128 TB | user-space virtual memory, different …
78 …000 | +128 TB | ffff7fffffffffff | ~16M TB | ... huge, almost 64 bits wide hole of non-canonical
79 … | | | | virtual memory addresses up to the -128 TB
83 … | Kernel-space virtual memory, shared between all processes:
86 ffff8d7ffee00000 | -114.5 TB | ffff8d7ffeffffff | 2 MB | fixmap
87 ffff8d7fff000000 | -114.5 TB | ffff8d7fffffffff | 16 MB | PCI io
88 ffff8d8000000000 | -114.5 TB | ffff8f7fffffffff | 2 TB | vmemmap
89 ffff8f8000000000 | -112.5 TB | ffffaf7fffffffff | 32 TB | vmalloc/ioremap space
90 … ffffaf8000000000 | -80.5 TB | ffffef7fffffffff | 64 TB | direct mapping of all physical memory
91 ffffef8000000000 | -16.5 TB | fffffffeffffffff | 16.5 TB | kasan
94 … | Identical layout to the 39-bit one from here on:
97 ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF
98 ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel