Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
 */
#include <linux/mm.h>
#include <linux/module.h>
 
#include <asm/tlbflush.h>
#include <asm/set_memory.h>
 
struct page_change_data {
<------>pgprot_t set_mask;
<------>pgprot_t clear_mask;
};
 
static int change_page_range(pte_t *ptep, unsigned long addr, void *data)
{
<------>struct page_change_data *cdata = data;
<------>pte_t pte = *ptep;
 
<------>pte = clear_pte_bit(pte, cdata->clear_mask);
<------>pte = set_pte_bit(pte, cdata->set_mask);
 
<------>set_pte_ext(ptep, pte, 0);
<------>return 0;
}
 
static bool in_range(unsigned long start, unsigned long size,
<------>unsigned long range_start, unsigned long range_end)
{
<------>return start >= range_start && start < range_end &&
<------><------>size <= range_end - start;
}
 
static int change_memory_common(unsigned long addr, int numpages,
<------><------><------><------>pgprot_t set_mask, pgprot_t clear_mask)
{
<------>unsigned long start = addr & PAGE_MASK;
<------>unsigned long end = PAGE_ALIGN(addr) + numpages * PAGE_SIZE;
<------>unsigned long size = end - start;
<------>int ret;
<------>struct page_change_data data;
 
<------>WARN_ON_ONCE(start != addr);
 
<------>if (!size)
<------><------>return 0;
 
<------>if (!in_range(start, size, MODULES_VADDR, MODULES_END) &&
<------>    !in_range(start, size, VMALLOC_START, VMALLOC_END))
<------><------>return -EINVAL;
 
<------>data.set_mask = set_mask;
<------>data.clear_mask = clear_mask;
 
<------>ret = apply_to_page_range(&init_mm, start, size, change_page_range,
<------><------><------><------><------>&data);
 
<------>flush_tlb_kernel_range(start, end);
<------>return ret;
}
 
int set_memory_ro(unsigned long addr, int numpages)
{
<------>return change_memory_common(addr, numpages,
<------><------><------><------><------>__pgprot(L_PTE_RDONLY),
<------><------><------><------><------>__pgprot(0));
}
 
int set_memory_rw(unsigned long addr, int numpages)
{
<------>return change_memory_common(addr, numpages,
<------><------><------><------><------>__pgprot(0),
<------><------><------><------><------>__pgprot(L_PTE_RDONLY));
}
 
int set_memory_nx(unsigned long addr, int numpages)
{
<------>return change_memory_common(addr, numpages,
<------><------><------><------><------>__pgprot(L_PTE_XN),
<------><------><------><------><------>__pgprot(0));
}
 
int set_memory_x(unsigned long addr, int numpages)
{
<------>return change_memory_common(addr, numpages,
<------><------><------><------><------>__pgprot(0),
<------><------><------><------><------>__pgprot(L_PTE_XN));
}