1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef __ASM_CSKY_PGALLOC_H 4 #define __ASM_CSKY_PGALLOC_H 5 6 #include <linux/highmem.h> 7 #include <linux/mm.h> 8 #include <linux/sched.h> 9 10 #define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL 11 #include <asm-generic/pgalloc.h> 12 13 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, 14 pte_t *pte) 15 { 16 set_pmd(pmd, __pmd(__pa(pte))); 17 } 18 19 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 20 pgtable_t pte) 21 { 22 set_pmd(pmd, __pmd(__pa(page_address(pte)))); 23 } 24 25 #define pmd_pgtable(pmd) pmd_page(pmd) 26 27 extern void pgd_init(unsigned long *p); 28 29 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) 30 { 31 pte_t *pte; 32 unsigned long i; 33 34 pte = (pte_t *) __get_free_page(GFP_KERNEL); 35 if (!pte) 36 return NULL; 37 38 for (i = 0; i < PAGE_SIZE/sizeof(pte_t); i++) 39 (pte + i)->pte_low = _PAGE_GLOBAL; 40 41 return pte; 42 } 43 44 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 45 { 46 pgd_t *ret; 47 pgd_t *init; 48 49 ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER); 50 if (ret) { 51 init = pgd_offset(&init_mm, 0UL); 52 pgd_init((unsigned long *)ret); 53 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, 54 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); 55 /* prevent out of order excute */ 56 smp_mb(); 57 #ifdef CONFIG_CPU_NEED_TLBSYNC 58 dcache_wb_range((unsigned int)ret, 59 (unsigned int)(ret + PTRS_PER_PGD)); 60 #endif 61 } 62 63 return ret; 64 } 65 66 #define __pte_free_tlb(tlb, pte, address) \ 67 do { \ 68 pgtable_pte_page_dtor(pte); \ 69 tlb_remove_page(tlb, pte); \ 70 } while (0) 71 72 extern void pagetable_init(void); 73 extern void mmu_init(unsigned long min_pfn, unsigned long max_pfn); 74 extern void pre_trap_init(void); 75 76 #endif /* __ASM_CSKY_PGALLOC_H */ 77