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 extern void pgd_init(unsigned long *p); 26 27 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) 28 { 29 pte_t *pte; 30 unsigned long i; 31 32 pte = (pte_t *) __get_free_page(GFP_KERNEL); 33 if (!pte) 34 return NULL; 35 36 for (i = 0; i < PAGE_SIZE/sizeof(pte_t); i++) 37 (pte + i)->pte_low = _PAGE_GLOBAL; 38 39 return pte; 40 } 41 42 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 43 { 44 pgd_t *ret; 45 pgd_t *init; 46 47 ret = (pgd_t *) __get_free_page(GFP_KERNEL); 48 if (ret) { 49 init = pgd_offset(&init_mm, 0UL); 50 pgd_init((unsigned long *)ret); 51 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, 52 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); 53 /* prevent out of order excute */ 54 smp_mb(); 55 #ifdef CONFIG_CPU_NEED_TLBSYNC 56 dcache_wb_range((unsigned int)ret, 57 (unsigned int)(ret + PTRS_PER_PGD)); 58 #endif 59 } 60 61 return ret; 62 } 63 64 #define __pte_free_tlb(tlb, pte, address) \ 65 do { \ 66 pagetable_pte_dtor(page_ptdesc(pte)); \ 67 tlb_remove_page_ptdesc(tlb, page_ptdesc(pte)); \ 68 } while (0) 69 70 extern void pagetable_init(void); 71 extern void mmu_init(unsigned long min_pfn, unsigned long max_pfn); 72 extern void pre_trap_init(void); 73 74 #endif /* __ASM_CSKY_PGALLOC_H */ 75