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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/init.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
struct page *dmw_virt_to_page(unsigned long kaddr)
{
return phys_to_page(__pa(kaddr));
}
EXPORT_SYMBOL(dmw_virt_to_page);
struct page *tlb_virt_to_page(unsigned long kaddr)
{
return phys_to_page(pfn_to_phys(pte_pfn(*virt_to_kpte(kaddr))));
}
EXPORT_SYMBOL(tlb_virt_to_page);
pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *init, *ret;
ret = __pgd_alloc(mm, 0);
if (ret) {
init = pgd_offset(&init_mm, 0UL);
pgd_init(ret);
memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}
return ret;
}
EXPORT_SYMBOL_GPL(pgd_alloc);
void pgd_init(void *addr)
{
unsigned long *p, *end;
unsigned long entry;
#if !defined(__PAGETABLE_PUD_FOLDED)
entry = (unsigned long)invalid_pud_table;
#elif !defined(__PAGETABLE_PMD_FOLDED)
entry = (unsigned long)invalid_pmd_table;
#else
entry = (unsigned long)invalid_pte_table;
#endif
p = (unsigned long *)addr;
end = p + PTRS_PER_PGD;
do {
p[0] = entry;
p[1] = entry;
p[2] = entry;
p[3] = entry;
p[4] = entry;
p += 8;
p[-3] = entry;
p[-2] = entry;
p[-1] = entry;
} while (p != end);
}
EXPORT_SYMBOL_GPL(pgd_init);
#ifndef __PAGETABLE_PMD_FOLDED
void pmd_init(void *addr)
{
unsigned long *p, *end;
unsigned long pagetable = (unsigned long)invalid_pte_table;
p = (unsigned long *)addr;
end = p + PTRS_PER_PMD;
do {
p[0] = pagetable;
p[1] = pagetable;
p[2] = pagetable;
p[3] = pagetable;
p[4] = pagetable;
p += 8;
p[-3] = pagetable;
p[-2] = pagetable;
p[-1] = pagetable;
} while (p != end);
}
EXPORT_SYMBOL_GPL(pmd_init);
#endif
#ifndef __PAGETABLE_PUD_FOLDED
void pud_init(void *addr)
{
unsigned long *p, *end;
unsigned long pagetable = (unsigned long)invalid_pmd_table;
p = (unsigned long *)addr;
end = p + PTRS_PER_PUD;
do {
p[0] = pagetable;
p[1] = pagetable;
p[2] = pagetable;
p[3] = pagetable;
p[4] = pagetable;
p += 8;
p[-3] = pagetable;
p[-2] = pagetable;
p[-1] = pagetable;
} while (p != end);
}
EXPORT_SYMBOL_GPL(pud_init);
#endif
void kernel_pte_init(void *addr)
{
unsigned long *p, *end;
p = (unsigned long *)addr;
end = p + PTRS_PER_PTE;
do {
p[0] = _PAGE_GLOBAL;
p[1] = _PAGE_GLOBAL;
p[2] = _PAGE_GLOBAL;
p[3] = _PAGE_GLOBAL;
p[4] = _PAGE_GLOBAL;
p += 8;
p[-3] = _PAGE_GLOBAL;
p[-2] = _PAGE_GLOBAL;
p[-1] = _PAGE_GLOBAL;
} while (p != end);
}
void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t pmd)
{
WRITE_ONCE(*pmdp, pmd);
flush_tlb_all();
}
void __init pagetable_init(void)
{
/* Initialize the entire pgd. */
pgd_init(swapper_pg_dir);
pgd_init(invalid_pg_dir);
#ifndef __PAGETABLE_PUD_FOLDED
pud_init(invalid_pud_table);
#endif
#ifndef __PAGETABLE_PMD_FOLDED
pmd_init(invalid_pmd_table);
#endif
}
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