From 2d7dca8b8a71bafbdf07085b283e89ef74e75ae8 Mon Sep 17 00:00:00 2001
From: Matheus <matheusuky@gmail.com>
Date: Sat, 23 Jul 2022 19:16:59 -0300
Subject: [PATCH] pmm changes

---
 src/include/kernel/pmm.h | 1 +
 src/sys/mm/pmm.c         | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/src/include/kernel/pmm.h b/src/include/kernel/pmm.h
index ce6aafe7..a1c04755 100644
--- a/src/include/kernel/pmm.h
+++ b/src/include/kernel/pmm.h
@@ -10,5 +10,6 @@ void pmm_free(void*, size_t);
 void pmm_setused(void*, size_t);
 
 extern void* limine_hhdm_offset;
+extern void* pmm_usabletop;
 
 #endif
diff --git a/src/sys/mm/pmm.c b/src/sys/mm/pmm.c
index 82f6f3e4..be73bb21 100644
--- a/src/sys/mm/pmm.c
+++ b/src/sys/mm/pmm.c
@@ -28,6 +28,7 @@ size_t* bitmap = 0;
 size_t usablememsize = 0;
 size_t totalmemsize  = 0;
 void* lastfree = PAGE_SIZE;
+void* pmm_usabletop;
 int lock = 0;
 
 static int getstate(void* addr){
@@ -236,4 +237,6 @@ void pmm_init(){
 
 	pmm_setused(bitmap, bitmappages);
 
+	pmm_usabletop = bitmaptop;
+
 }