mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-20 02:34:23 +08:00
07037db5d4
This patch contains code to manage the RISC-V MMU, including definitions of the page tables and the page walking code. Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/*
|
|
* Copyright (C) 2012 Regents of the University of California
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation, version 2.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#ifndef _ASM_RISCV_MMU_CONTEXT_H
|
|
#define _ASM_RISCV_MMU_CONTEXT_H
|
|
|
|
#include <asm-generic/mm_hooks.h>
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
static inline void enter_lazy_tlb(struct mm_struct *mm,
|
|
struct task_struct *task)
|
|
{
|
|
}
|
|
|
|
/* Initialize context-related info for a new mm_struct */
|
|
static inline int init_new_context(struct task_struct *task,
|
|
struct mm_struct *mm)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void destroy_context(struct mm_struct *mm)
|
|
{
|
|
}
|
|
|
|
static inline pgd_t *current_pgdir(void)
|
|
{
|
|
return pfn_to_virt(csr_read(sptbr) & SPTBR_PPN);
|
|
}
|
|
|
|
static inline void set_pgdir(pgd_t *pgd)
|
|
{
|
|
csr_write(sptbr, virt_to_pfn(pgd) | SPTBR_MODE);
|
|
}
|
|
|
|
static inline void switch_mm(struct mm_struct *prev,
|
|
struct mm_struct *next, struct task_struct *task)
|
|
{
|
|
if (likely(prev != next)) {
|
|
set_pgdir(next->pgd);
|
|
local_flush_tlb_all();
|
|
}
|
|
}
|
|
|
|
static inline void activate_mm(struct mm_struct *prev,
|
|
struct mm_struct *next)
|
|
{
|
|
switch_mm(prev, next, NULL);
|
|
}
|
|
|
|
static inline void deactivate_mm(struct task_struct *task,
|
|
struct mm_struct *mm)
|
|
{
|
|
}
|
|
|
|
#endif /* _ASM_RISCV_MMU_CONTEXT_H */
|