From 3a586b35159dc664b5a5f527eaf6e7e0dd63d322 Mon Sep 17 00:00:00 2001
From: shirou <shirou.faw@gmail.com>
Date: Sat, 24 Feb 2024 04:24:34 +0000
Subject: [PATCH] [mem][windows]: add ExWindows and implement VirualTotal/Avail

This commit fixes #1588. Thank you!
---
 cpu/cpu_windows.go |  4 +---
 mem/ex_windows.go  | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+), 3 deletions(-)
 create mode 100644 mem/ex_windows.go

diff --git a/cpu/cpu_windows.go b/cpu/cpu_windows.go
index c9136b75d..4476b91cb 100644
--- a/cpu/cpu_windows.go
+++ b/cpu/cpu_windows.go
@@ -13,9 +13,7 @@ import (
 	"golang.org/x/sys/windows"
 )
 
-var (
-	procGetNativeSystemInfo = common.Modkernel32.NewProc("GetNativeSystemInfo")
-)
+var procGetNativeSystemInfo = common.Modkernel32.NewProc("GetNativeSystemInfo")
 
 type win32_Processor struct {
 	Family                    uint16
diff --git a/mem/ex_windows.go b/mem/ex_windows.go
new file mode 100644
index 000000000..4f1573b3c
--- /dev/null
+++ b/mem/ex_windows.go
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: BSD-3-Clause
+//go:build windows
+
+package mem
+
+import (
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+// ExVirtualMemory represents Windows specific information
+// https://learn.microsoft.com/en-us/windows/win32/api/sysinfoapi/ns-sysinfoapi-memorystatusex
+type ExVirtualMemory struct {
+	VirtualTotal uint64 `json:"virtualTotal"`
+	VirtualAvail uint64 `json:"virtualAvail"`
+}
+
+type ExWindows struct{}
+
+func NewExWindows() *ExWindows {
+	return &ExWindows{}
+}
+
+func (e *ExWindows) VirtualMemory() (*ExVirtualMemory, error) {
+	var memInfo memoryStatusEx
+	memInfo.cbSize = uint32(unsafe.Sizeof(memInfo))
+	mem, _, _ := procGlobalMemoryStatusEx.Call(uintptr(unsafe.Pointer(&memInfo)))
+	if mem == 0 {
+		return nil, windows.GetLastError()
+	}
+
+	ret := &ExVirtualMemory{
+		VirtualTotal: memInfo.ullTotalVirtual,
+		VirtualAvail: memInfo.ullAvailVirtual,
+	}
+
+	return ret, nil
+}