| /* 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) |
| |
| #define check_pgt_cache() do {} while (0) |
| |
| extern void pagetable_init(void); |
| extern void pre_mmu_init(void); |
| extern void pre_trap_init(void); |
| |
| #endif /* __ASM_CSKY_PGALLOC_H */ |