From 5890df7bf838a5a912465a1bba02e5d8cf34e33c Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Sat, 2 Nov 2024 18:58:13 +0200
Subject: allow skipping some cache flushes in proc

---
 arch/riscv64/kernel/pte.h | 78 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 arch/riscv64/kernel/pte.h

(limited to 'arch/riscv64/kernel/pte.h')

diff --git a/arch/riscv64/kernel/pte.h b/arch/riscv64/kernel/pte.h
new file mode 100644
index 0000000..03c3d05
--- /dev/null
+++ b/arch/riscv64/kernel/pte.h
@@ -0,0 +1,78 @@
+#ifndef KMI_RISCV_PTE_H
+#define KMI_RISCV_PTE_H
+
+/**
+ * Get page table entry physical page number.
+ *
+ * @param pte Page table entry.
+ * @return Corresponding physical page number.
+ */
+#define pte_ppn(pte) (((pm_t)(pte)) >> 10)
+
+/**
+ * Get page table entry flags.
+ *
+ * @param pte Page table entry.
+ * @return Corresponding flags.
+ */
+#define pte_flags(pte) (((pm_t)(pte)) & 0xff)
+
+/**
+ * Convert physical memory address to page table entry.
+ *
+ * @param p Physical memory address.
+ * @param f Flags to use.
+ * @return Corresponding page table entry.
+ */
+#define to_pte(p, f) ((((p) >> page_shift()) << 10) | (f))
+
+/**
+ * Get physical address in page table entry.
+ *
+ * @param pte Page table entry.
+ * @return Corresponding physical address.
+ */
+#define pte_paddr(pte) (pte_ppn(pte) << page_shift())
+
+/**
+ * Get virtual address in page table entry.
+ *
+ * @param pte Page table entry.
+ * @return Corresponding virtual address.
+ */
+#define pte_addr(pte) __va(pte_paddr(pte))
+
+/**
+ * Virtual memory address to page order index.
+ *
+ * @param a Virtual address.
+ * @param o Order of page.
+ * @return Corresponding page index.
+ */
+#define vm_to_index(a, o) (pm_to_index(a, o))
+
+/**
+ * Check if page table entry is active.
+ *
+ * @param pte Page table entry.
+ * @return \c 0 if entry is not active, non-zero otherwise.
+ */
+#define is_active(pte) (pte_flags(pte) &VM_V)
+
+/**
+ * Check if page table entry is a leaf.
+ *
+ * @param pte Page table entry.
+ * @return \c 0 if entry is not leaf, non-zero otherwise.
+ */
+#define is_leaf(pte) (is_active(pte) && (pte_flags(pte) & ~VM_V))
+
+/**
+ * Check if page table entry is a branch.
+ *
+ * @param pte Page table entry.
+ * @return \c 0 if entry is not branch, non-zero otherwise.
+ */
+#define is_branch(pte) (is_active(pte) && !(pte_flags(pte) & ~VM_V))
+
+#endif /* KMI_RISCV_PTE_H */
-- 
cgit v1.3