blob: 704858be5ad0ea32362b44312ef4b560d54c2b0a (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
/* SPDX-License-Identifier: copyleft-next-0.3.1 */
/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
#ifndef KMI_RISCV_VMAP_H
#define KMI_RISCV_VMAP_H
#include "uapi.h"
/**
* @file vmem.h
* riscv64 definitions of arch-specific virtual memory data types and macros.
* Very likely VM_* should be moved to \ref include/kmi/vmem.h and made
* architecture-nonspecific, but works for now.
*/
/**
* Number of entries in one page table, depends on if we're running riscv32 or
* riscv64.
*/
#if __riscv_xlen == 64
/** When running riscv64, each page table has 512 8byte entries. */
#define RISCV_NUM_LEAVES 512
#else
/** When running riscv32, each page table has 1024 4byte entries. */
#define RISCV_NUM_LEAVES 1024
#endif
/** Memory mode of cpu. Currently only Sv39 is supported. */
enum mm_mode {
/** 48bit effective addresses on 64bit systems. */
Sv48,
/** 39bit effective addresses on 64bit systems. */
Sv39,
/** 32bit effective addresses on 32bit systems. */
Sv32,
};
/**
* Virtual memory.
*
* On riscv, all page tables are luckily identical, so we can
* use this without much trickery.
*/
struct vmem {
/** RISCV_NUM_LEAVES pointers to other page tables. */
struct vmem *leaf[RISCV_NUM_LEAVES];
};
/**
* Extract virtual memory flags (MR_XXX).
*
* @param x Flags to extract virtual memory region flags from.
* @return Virtual memory region flags.
*/
#define vm_flags(x) ((x) & ~0xff)
/**
* Extract physical memory page flags (VM_XXX).
*
* @param x Flags to extract physical memory page flags from.
* @return Physical memory page flags.
*/
#define vp_flags(x) ((x) & 0xff)
/** How many VM_XXX flags architecture has. MR_XXX are applied after them. */
#define ARCH_VP_FLAGS 8
#endif /* KMI_RISCV_VMAP_H */
|
