1 files changed, 115 insertions, 0 deletions

diff --git a/arch/csky/include/asm/pgalloc.h b/arch/csky/include/asm/pgalloc.h
new file mode 100644
index 000000000000..bf4f4a0e140e
--- /dev/null
+++ b/arch/csky/include/asm/pgalloc.h
@@ -0,0 +1,115 @@
+/* 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>
+
+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,
+                                        unsigned long address)
+{
+        pte_t *pte;
+        unsigned long *kaddr, i;
+
+        pte = (pte_t *) __get_free_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL,
+                                         PTE_ORDER);
+        kaddr = (unsigned long *)pte;
+        if (address & 0x80000000)
+                for (i = 0; i < (PAGE_SIZE/4); i++)
+                        *(kaddr + i) = 0x1;
+        else
+                clear_page(kaddr);
+
+        return pte;
+}
+
+static inline struct page *pte_alloc_one(struct mm_struct *mm,
+                                                unsigned long address)
+{
+        struct page *pte;
+        unsigned long *kaddr, i;
+
+        pte = alloc_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL, PTE_ORDER);
+        if (pte) {
+                kaddr = kmap_atomic(pte);
+                if (address & 0x80000000) {
+                        for (i = 0; i < (PAGE_SIZE/4); i++)
+                                *(kaddr + i) = 0x1;
+                } else
+                        clear_page(kaddr);
+                kunmap_atomic(kaddr);
+                pgtable_page_ctor(pte);
+        }
+        return pte;
+}
+
+static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+{
+        free_pages((unsigned long)pte, PTE_ORDER);
+}
+
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
+{
+        pgtable_page_dtor(pte);
+        __free_pages(pte, PTE_ORDER);
+}
+
+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 */