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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_pte_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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