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 ffffffc4fea00000 | -236 GB | ffffffc4feffffff | 6 MB | fixmap
51 ffffffc4ff000000 | -236 GB | ffffffc4ffffffff | 16 MB | PCI io
52 ffffffc500000000 | -236 GB | ffffffc5ffffffff | 4 GB | vmemmap
53 ffffffc600000000 | -232 GB | ffffffd5ffffffff | 64 GB | vmalloc/ioremap space
54 … ffffffd600000000 | -168 GB | fffffff5ffffffff | 128 GB | direct mapping of all physical memory
56 fffffff700000000 | -36 GB | fffffffeffffffff | 32 GB | kasan
62 ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF
63 ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel
67 RISC-V Linux Kernel SV48
68 ------------------------
76 …0000000000000000 | 0 | 00007fffffffffff | 128 TB | user-space virtual memory, different …
79 …000 | +128 TB | ffff7fffffffffff | ~16M TB | ... huge, almost 64 bits wide hole of non-canonical
80 … | | | | virtual memory addresses up to the -128 TB
84 … | Kernel-space virtual memory, shared between all processes:
87 ffff8d7ffea00000 | -114.5 TB | ffff8d7ffeffffff | 6 MB | fixmap
88 ffff8d7fff000000 | -114.5 TB | ffff8d7fffffffff | 16 MB | PCI io
89 ffff8d8000000000 | -114.5 TB | ffff8f7fffffffff | 2 TB | vmemmap
90 ffff8f8000000000 | -112.5 TB | ffffaf7fffffffff | 32 TB | vmalloc/ioremap space
91 … ffffaf8000000000 | -80.5 TB | ffffef7fffffffff | 64 TB | direct mapping of all physical memory
92 ffffef8000000000 | -16.5 TB | fffffffeffffffff | 16.5 TB | kasan
95 … | Identical layout to the 39-bit one from here on:
98 ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF
99 ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel
103 RISC-V Linux Kernel SV57
104 ------------------------
112 …0000000000000000 | 0 | 00ffffffffffffff | 64 PB | user-space virtual memory, different …
115 …000 | +64 PB | feffffffffffffff | ~16K PB | ... huge, almost 64 bits wide hole of non-canonical
116 … | | | | virtual memory addresses up to the -64 PB
120 … | Kernel-space virtual memory, shared between all processes:
123 ff1bfffffea00000 | -57 PB | ff1bfffffeffffff | 6 MB | fixmap
124 ff1bffffff000000 | -57 PB | ff1bffffffffffff | 16 MB | PCI io
125 ff1c000000000000 | -57 PB | ff1fffffffffffff | 1 PB | vmemmap
126 ff20000000000000 | -56 PB | ff5fffffffffffff | 16 PB | vmalloc/ioremap space
127 … ff60000000000000 | -40 PB | ffdeffffffffffff | 32 PB | direct mapping of all physical memory
128 ffdf000000000000 | -8 PB | fffffffeffffffff | 8 PB | kasan
131 … | Identical layout to the 39-bit one from here on:
134 ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF
135 ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel