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/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#ifndef __ASM_CSKY_PGALLOC_H
#define __ASM_CSKY_PGALLOC_H
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/sched.h>
#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */
static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
pte_t *pte)
{
set_pmd(pmd, __pmd(__pa(pte)));
}
static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
pgtable_t pte)
{
set_pmd(pmd, __pmd(__pa(page_address(pte))));
}
#define pmd_pgtable(pmd) pmd_page(pmd)
extern void pgd_init(unsigned long *p);
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
{
pte_t *pte;
unsigned long i;
pte = (pte_t *) __get_free_page(GFP_KERNEL);
if (!pte)
return NULL;
for (i = 0; i < PAGE_SIZE/sizeof(pte_t); i++)
(pte + i)->pte_low = _PAGE_GLOBAL;
return pte;
}
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
free_pages((unsigned long)pgd, PGD_ORDER);
}
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *ret;
pgd_t *init;
ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
if (ret) {
init = pgd_offset(&init_mm, 0UL);
pgd_init((unsigned long *)ret);
memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
/* prevent out of order excute */
smp_mb();
#ifdef CONFIG_CPU_NEED_TLBSYNC
dcache_wb_range((unsigned int)ret,
(unsigned int)(ret + PTRS_PER_PGD));
#endif
}
return ret;
}
#define __pte_free_tlb(tlb, pte, address) \
do { \
pgtable_page_dtor(pte); \
tlb_remove_page(tlb, pte); \
} while (0)
extern void pagetable_init(void);
extern void pre_mmu_init(void);
extern void pre_trap_init(void);
#endif /* __ASM_CSKY_PGALLOC_H */
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