From 5f63ea8f8a090c382bdadd83ad803d7c5c1610ff Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Mon, 14 Oct 2024 11:38:03 +0300
Subject: [PATCH] Kernel: Add CPUID check for 1 GiB page support

---
 kernel/include/kernel/CPUID.h |  1 +
 kernel/kernel/CPUID.cpp       | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/kernel/include/kernel/CPUID.h b/kernel/include/kernel/CPUID.h
index ac12e2e8..e4aef13a 100644
--- a/kernel/include/kernel/CPUID.h
+++ b/kernel/include/kernel/CPUID.h
@@ -80,5 +80,6 @@ namespace CPUID
 	bool has_nxe();
 	bool has_pge();
 	bool has_pat();
+	bool has_1gib_pages();
 
 }
diff --git a/kernel/kernel/CPUID.cpp b/kernel/kernel/CPUID.cpp
index 046aeee6..57b1a138 100644
--- a/kernel/kernel/CPUID.cpp
+++ b/kernel/kernel/CPUID.cpp
@@ -64,6 +64,16 @@ namespace CPUID
 		return edx & CPUID::EDX_PAT;
 	}
 
+	bool has_1gib_pages()
+	{
+		uint32_t buffer[4] {};
+		get_cpuid(0x80000000, buffer);
+		if (buffer[0] < 0x80000001)
+			return false;
+		get_cpuid(0x80000001, buffer);
+		return buffer[3] & (1 << 26);
+	}
+
 	const char* feature_string_ecx(uint32_t feat)
 	{
 		switch (feat)