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-rw-r--r--arch/riscv/mm/pgtable.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/arch/riscv/mm/pgtable.c b/arch/riscv/mm/pgtable.c
new file mode 100644
index 000000000000..6645ead1a7c1
--- /dev/null
+++ b/arch/riscv/mm/pgtable.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <asm/pgalloc.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/pgtable.h>
+
+#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
+int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
+{
+ return 0;
+}
+
+void p4d_clear_huge(p4d_t *p4d)
+{
+}
+
+int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot)
+{
+ pud_t new_pud = pfn_pud(__phys_to_pfn(phys), prot);
+
+ set_pud(pud, new_pud);
+ return 1;
+}
+
+int pud_clear_huge(pud_t *pud)
+{
+ if (!pud_leaf(READ_ONCE(*pud)))
+ return 0;
+ pud_clear(pud);
+ return 1;
+}
+
+int pud_free_pmd_page(pud_t *pud, unsigned long addr)
+{
+ pmd_t *pmd = pud_pgtable(*pud);
+ int i;
+
+ pud_clear(pud);
+
+ flush_tlb_kernel_range(addr, addr + PUD_SIZE);
+
+ for (i = 0; i < PTRS_PER_PMD; i++) {
+ if (!pmd_none(pmd[i])) {
+ pte_t *pte = (pte_t *)pmd_page_vaddr(pmd[i]);
+
+ pte_free_kernel(NULL, pte);
+ }
+ }
+
+ pmd_free(NULL, pmd);
+
+ return 1;
+}
+
+int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot)
+{
+ pmd_t new_pmd = pfn_pmd(__phys_to_pfn(phys), prot);
+
+ set_pmd(pmd, new_pmd);
+ return 1;
+}
+
+int pmd_clear_huge(pmd_t *pmd)
+{
+ if (!pmd_leaf(READ_ONCE(*pmd)))
+ return 0;
+ pmd_clear(pmd);
+ return 1;
+}
+
+int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
+{
+ pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd);
+
+ pmd_clear(pmd);
+
+ flush_tlb_kernel_range(addr, addr + PMD_SIZE);
+ pte_free_kernel(NULL, pte);
+ return 1;
+}
+
+#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */