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/* SPDX-License-Identifier: GPL-3.0-or-later */
/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
#ifndef KMI_RISCV_VMAP_H
#define KMI_RISCV_VMAP_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.
*/
#include <kmi/types.h>
#include <kmi/attrs.h>
/**
* 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
/** Page is active. */
#define VM_V (1 << 0)
/** Page is readable. */
#define VM_R (1 << 1)
/** Page is writable. */
#define VM_W (1 << 2)
/** Page is executable. */
#define VM_X (1 << 3)
/** Page is user-accessible. */
#define VM_U (1 << 4)
/** Page is global. */
#define VM_G (1 << 5)
/** Page has been accessed. */
#define VM_A (1 << 6)
/** Page is dirty. */
#define VM_D (1 << 7)
/** 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];
};
#endif /* KMI_RISCV_VMAP_H */
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