From 24f0bd6ca06fb8e2c8e7d9d62d669301dd89184b Mon Sep 17 00:00:00 2001
From: Erin <erin@hashbang.sh>
Date: Mon, 5 Jun 2017 11:14:54 -0500
Subject: [PATCH] memory::paging::entry::Entry: implement flag loading from ELF
 section

---
 src/arch/x86_64/memory/paging/entry.rs | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/arch/x86_64/memory/paging/entry.rs b/src/arch/x86_64/memory/paging/entry.rs
index 35b6c21..dd12856 100644
--- a/src/arch/x86_64/memory/paging/entry.rs
+++ b/src/arch/x86_64/memory/paging/entry.rs
@@ -1,5 +1,6 @@
 //! Page table entry (meta)data
 
+use multiboot2::ElfSection;
 use arch::x86_64::memory::Frame;
 
 pub struct Entry(u64);
@@ -50,3 +51,24 @@ bitflags! {
         const NO_EXECUTE =      1 << 63;
     }
 }
+
+impl EntryFlags {
+    pub fn from_elf_section_flags(section: &ElfSection) -> EntryFlags {
+        use multiboot2::{ELF_SECTION_ALLOCATED, ELF_SECTION_WRITABLE,
+            ELF_SECTION_EXECUTABLE};
+
+        let mut flags = EntryFlags::empty();
+
+        if section.flags().contains(ELF_SECTION_ALLOCATED) {
+            flags = flags | PRESENT;
+        }
+        if section.flags().contains(ELF_SECTION_WRITABLE) {
+            flags = flags | WRITABLE;
+        }
+        if !section.flags().contains(ELF_SECTION_EXECUTABLE) {
+            flags = flags | NO_EXECUTE;
+        }
+
+        flags
+    }
+}