From d728052d62470799f73f6d9a2b8baa2b0b357383 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matteo=20Gm=C3=BCr?= <matteo.gmuer1@ost.ch>
Date: Sun, 20 Oct 2024 07:01:53 +0000
Subject: Add helper methods to phyisca frame

---
 arch/x86_64/src/memory/paging/page_entry.cpp   |  4 ++--
 arch/x86_64/src/memory/paging/page_table.cpp   |  6 +++---
 arch/x86_64/src/memory/paging/virtual_page.cpp | 22 ++++++++++++++++++++++
 3 files changed, 27 insertions(+), 5 deletions(-)
 create mode 100644 arch/x86_64/src/memory/paging/virtual_page.cpp

(limited to 'arch/x86_64/src/memory/paging')

diff --git a/arch/x86_64/src/memory/paging/page_entry.cpp b/arch/x86_64/src/memory/paging/page_entry.cpp
index 43c0b71..692f8ae 100644
--- a/arch/x86_64/src/memory/paging/page_entry.cpp
+++ b/arch/x86_64/src/memory/paging/page_entry.cpp
@@ -35,8 +35,8 @@ namespace teachos::arch::memory::paging
 
   auto entry::set_address(allocator::physical_frame frame) -> void
   {
-    arch::exception_handling::assert((frame.start_address() & ~0x000fffff'fffff000) == 0,
-                                     "Start address is not aligned with Page");
+    exception_handling::assert((frame.start_address() & ~0x000fffff'fffff000) == 0,
+                               "Start address is not aligned with Page");
     flags = std::bitset<64U>(frame.start_address()) | flags;
   }
 }  // namespace teachos::arch::memory::paging
diff --git a/arch/x86_64/src/memory/paging/page_table.cpp b/arch/x86_64/src/memory/paging/page_table.cpp
index 786ff69..8345161 100644
--- a/arch/x86_64/src/memory/paging/page_table.cpp
+++ b/arch/x86_64/src/memory/paging/page_table.cpp
@@ -23,8 +23,8 @@ namespace teachos::arch::memory::paging
 
   auto page_table::next_table(std::size_t table_index) -> void
   {
-    arch::exception_handling::assert(current_level != LEVEL1,
-                                     "[Page Table] Attempted to call next_table on level 1 page table");
+    exception_handling::assert(current_level != LEVEL1,
+                               "[Page Table] Attempted to call next_table on level 1 page table");
     auto address = next_table_address(table_index);
 
     if (address.has_value())
@@ -38,7 +38,7 @@ namespace teachos::arch::memory::paging
   {
     // C array is not bounds checked, therefore we have to check ourselves, to ensure no out of bounds reads, which
     // could be incredibly hard to debug later.
-    arch::exception_handling::assert(index < PAGE_TABLE_ENTRY_COUNT, "[Page Table] index out of bounds");
+    exception_handling::assert(index < PAGE_TABLE_ENTRY_COUNT, "[Page Table] index out of bounds");
     return current_table->entries[index];
   }
 
diff --git a/arch/x86_64/src/memory/paging/virtual_page.cpp b/arch/x86_64/src/memory/paging/virtual_page.cpp
new file mode 100644
index 0000000..3fb6caf
--- /dev/null
+++ b/arch/x86_64/src/memory/paging/virtual_page.cpp
@@ -0,0 +1,22 @@
+#include "arch/memory/paging/virtual_page.hpp"
+
+#include "arch/exception_handling/assert.hpp"
+#include "arch/memory/allocator/physical_frame.hpp"
+
+namespace teachos::arch::memory::paging
+{
+  virtual_page::virtual_page(std::size_t page_number)
+      : page_number(page_number)
+  {
+    // Nothing to do
+  }
+
+  auto virtual_page::containing_address(std::size_t virtual_address) -> virtual_page
+  {
+    exception_handling::assert(virtual_address < 0x0000800000000000 || virtual_address >= 0xffff800000000000,
+                               "[Virtual Page] Attempted to create virtual page from invalid address");
+    return virtual_page{virtual_address / allocator::PAGE_FRAME_SIZE};
+  }
+
+  auto virtual_page::start_address() const -> uint64_t { return page_number * allocator::PAGE_FRAME_SIZE; }
+}  // namespace teachos::arch::memory::paging
-- 
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