From 132d3236bb884433bf94e961f6d32264e0334aec Mon Sep 17 00:00:00 2001
From: ornitorrincos
Date: Tue, 18 Aug 2026 12:15:05 +0200
Subject: 

---
 misc-host/test-vaddr/vaddr.cpp | 50 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 misc-host/test-vaddr/vaddr.cpp

(limited to 'misc-host/test-vaddr')

diff --git a/misc-host/test-vaddr/vaddr.cpp b/misc-host/test-vaddr/vaddr.cpp
new file mode 100644
index 0000000..c5af491
--- /dev/null
+++ b/misc-host/test-vaddr/vaddr.cpp
@@ -0,0 +1,50 @@
+#include <iostream>
+#include <cstdio>
+#include <cstdint>
+
+typedef struct __attribute__((packed))
+{
+  unsigned long page:21;
+  unsigned long PD:9;
+  unsigned long PDP:9;
+  unsigned long PML4:9;
+  unsigned long sign:16;
+} s_vptr;
+
+union v
+{
+s_vptr vptr;
+unsigned long ptr;
+};
+
+int main()
+{
+  // 0x0FFFFFFFF; below 4GB
+  //unsigned long vaddr = 0x40000000; // 1GB // 0x100000000; // 4GB
+
+  unsigned long vaddr = 0x280000000; // 10GB
+  
+  uint64_t kr = 0xffffffff7fffffff; // -2GB mark
+
+  //v * p = (v*)&vaddr;
+  v * p = (v*)&kr;
+
+  std::cout << "sign " << p->vptr.sign << std::endl;
+  std::cout << "PML4 " << p->vptr.PML4 << std::endl;
+  std::cout << "PDP " << p->vptr.PDP << std::endl;
+  std::cout << "PD " << p->vptr.PD << std::endl;
+  std::cout << "Page " << p->vptr.page << std::endl;  
+
+  
+  printf("%p\n", p->ptr);
+  //std::cout << "Pointer " << p->ptr << std::endl;
+  
+  v p2;
+  p2.ptr = 0;
+  p2.vptr.PML4 = 1;
+  
+  printf("p2: %p\n", p2.ptr);
+  
+  return 0;
+}
+
-- 
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