From b90e152c02aad225e83a3e6c1b80d1a0e396bb14 Mon Sep 17 00:00:00 2001
From: Ada Christine <adachristine18@gmail.com>
Date: Fri, 23 Apr 2021 01:12:23 +0000
Subject: less repetition, more flexibility with paging macros

---
 api/kernel/memory/paging.h |  9 +++++++--
 api/kernel/memory/range.h  | 21 +++++++++++++++++++++
 2 files changed, 28 insertions(+), 2 deletions(-)
 create mode 100644 api/kernel/memory/range.h

(limited to 'api')

diff --git a/api/kernel/memory/paging.h b/api/kernel/memory/paging.h
index d3dc541..3f16930 100644
--- a/api/kernel/memory/paging.h
+++ b/api/kernel/memory/paging.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <stddef.h>
 
 #define PAGE_MAP_LEVELS 4
 #define PAGE_MAP_BITS 9
@@ -24,5 +25,9 @@
 
 #define PAGE_TABLE_INDEX_MASK ((1 << PAGE_MAP_BITS) - 1)
 
-#define page_table_index_bits(l) (PAGE_OFFSET_BITS + PAGE_MAP_BITS * (l - 1))
-#define page_table_index(v, l) (((uint64_t)v >> page_table_index_bits(l)) & PAGE_TABLE_INDEX_MASK)
+#define pte_index_bits(l) (PAGE_OFFSET_BITS + PAGE_MAP_BITS * (l - 1))
+#define pte_index(v, l) (((uintptr_t)v >> pte_index_bits(l)) & PAGE_TABLE_INDEX_MASK)
+#define page_size(l) (1 << pte_index_bits(l))
+#define page_address(a, l) (a & ~(page_size(l) - 1))
+#define page_offset(a, l) (a & (page_size(l) - 1))
+#define page_count(s, l) (((s + page_size(l) - 1) & ~(page_size(l) - 1)) / page_size(l))
diff --git a/api/kernel/memory/range.h b/api/kernel/memory/range.h
new file mode 100644
index 0000000..6a68467
--- /dev/null
+++ b/api/kernel/memory/range.h
@@ -0,0 +1,21 @@
+#pragma once
+
+#include <stdint.h>
+#include <stddef.h>
+
+typedef uintptr_t phys_addr_t;
+
+enum memory_range_type
+{
+    UNUSABLE_MEMORY,
+    RESERVED_MEMORY,
+    SYSTEM_MEMORY,
+    AVAILABLE_MEMORY,
+};
+
+struct memory_range
+{
+    enum memory_range_type type;
+    phys_addr_t base;
+    size_t size;
+};
-- 
cgit v1.3.1-1-g115d