From 15205711b35db0d8ac5516f84ba73fa3550ccc62 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 17 Mar 2022 21:49:10 -0700
Subject: Initialize all BSS sections in MMU

---
 src/lib/mmu.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/lib/mmu.c b/src/lib/mmu.c
index 6a947c5..0a2f892 100644
--- a/src/lib/mmu.c
+++ b/src/lib/mmu.c
@@ -15,11 +15,15 @@ void mmu_section(unsigned long virtual, unsigned long physical, unsigned long fl
 	*entry = physval;
 }
 
+extern unsigned long __bss_end;
 void mmu_init(void)
 {
-	mmu_section(0x00000000, 0x00000000, CACHABLE | BUFFERABLE);
-	for (unsigned long addr =  0x00100000;; addr += 0x00100000) {
-		mmu_section(addr, addr, NO_PERMISSIONS_REQUIRED);
+	for (unsigned long addr =  0x00000000;; addr += 0x00100000) {
+		if (addr < (unsigned long)&__bss_end) {
+			mmu_section(addr, addr, CACHABLE | BUFFERABLE);
+		} else {
+			mmu_section(addr, addr, NO_PERMISSIONS_REQUIRED);
+		}
 		if (addr == 0x02000000)
 			mmu_section(addr, addr, CACHABLE | BUFFERABLE | NO_PERMISSIONS_REQUIRED);
 		//else if (addr == 0x3F000000)
-- 
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