From 62574616849e9c045fbec1f07f81461268f9ccb5 Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Sat, 29 Oct 2022 13:49:09 -0700
Subject: core: hle: kernel: k_page_group: Add KPageBufferSlabHeap.

---
 src/core/hle/kernel/k_page_group.h | 86 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)

diff --git a/src/core/hle/kernel/k_page_group.h b/src/core/hle/kernel/k_page_group.h
index 968753992..316f172f2 100644
--- a/src/core/hle/kernel/k_page_group.h
+++ b/src/core/hle/kernel/k_page_group.h
@@ -5,6 +5,7 @@
 
 #include <list>
 
+#include "common/alignment.h"
 #include "common/assert.h"
 #include "common/common_types.h"
 #include "core/hle/kernel/memory_types.h"
@@ -12,6 +13,89 @@
 
 namespace Kernel {
 
+class KPageGroup;
+
+class KBlockInfo {
+private:
+    friend class KPageGroup;
+
+public:
+    constexpr KBlockInfo() = default;
+
+    constexpr void Initialize(PAddr addr, size_t np) {
+        ASSERT(Common::IsAligned(addr, PageSize));
+        ASSERT(static_cast<u32>(np) == np);
+
+        m_page_index = static_cast<u32>(addr) / PageSize;
+        m_num_pages = static_cast<u32>(np);
+    }
+
+    constexpr PAddr GetAddress() const {
+        return m_page_index * PageSize;
+    }
+    constexpr size_t GetNumPages() const {
+        return m_num_pages;
+    }
+    constexpr size_t GetSize() const {
+        return this->GetNumPages() * PageSize;
+    }
+    constexpr PAddr GetEndAddress() const {
+        return (m_page_index + m_num_pages) * PageSize;
+    }
+    constexpr PAddr GetLastAddress() const {
+        return this->GetEndAddress() - 1;
+    }
+
+    constexpr KBlockInfo* GetNext() const {
+        return m_next;
+    }
+
+    constexpr bool IsEquivalentTo(const KBlockInfo& rhs) const {
+        return m_page_index == rhs.m_page_index && m_num_pages == rhs.m_num_pages;
+    }
+
+    constexpr bool operator==(const KBlockInfo& rhs) const {
+        return this->IsEquivalentTo(rhs);
+    }
+
+    constexpr bool operator!=(const KBlockInfo& rhs) const {
+        return !(*this == rhs);
+    }
+
+    constexpr bool IsStrictlyBefore(PAddr addr) const {
+        const PAddr end = this->GetEndAddress();
+
+        if (m_page_index != 0 && end == 0) {
+            return false;
+        }
+
+        return end < addr;
+    }
+
+    constexpr bool operator<(PAddr addr) const {
+        return this->IsStrictlyBefore(addr);
+    }
+
+    constexpr bool TryConcatenate(PAddr addr, size_t np) {
+        if (addr != 0 && addr == this->GetEndAddress()) {
+            m_num_pages += static_cast<u32>(np);
+            return true;
+        }
+        return false;
+    }
+
+private:
+    constexpr void SetNext(KBlockInfo* next) {
+        m_next = next;
+    }
+
+private:
+    KBlockInfo* m_next{};
+    u32 m_page_index{};
+    u32 m_num_pages{};
+};
+static_assert(sizeof(KBlockInfo) <= 0x10);
+
 class KPageGroup final {
 public:
     class Node final {
@@ -92,6 +176,8 @@ public:
         return nodes.empty();
     }
 
+    void Finalize() {}
+
 private:
     std::list<Node> nodes;
 };
-- 
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