From 5b2bcf08bcd1e6844bdd6e2bbc516274a36f6800 Mon Sep 17 00:00:00 2001
From: rain <pengruiyang0427@163.com>
Date: Mon, 15 Feb 2021 15:22:01 +0800
Subject: [PATCH] 0.451s-boot: load 4KB of loader, not 512B

---
 LINES             |  2 ++
 README.md         |  2 ++
 boot/x86/boot.asm | 25 ++++++++++++++++++++++---
 3 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/LINES b/LINES
index a69de44..b384f38 100644
--- a/LINES
+++ b/LINES
@@ -6,3 +6,5 @@
 
 2021-2-15 0.432: 432 lines, 4 files, rain
 
+2021-2-15 0.451: 451 lines, 4 files, rain
+
diff --git a/README.md b/README.md
index ad037e6..9dc49ef 100644
--- a/README.md
+++ b/README.md
@@ -19,4 +19,6 @@ Cunix kernel
 `0.432s-boot`: 
 	make directory `include/`, and add segment.inc, but it doesn't work. :-)
 
+`0.451s-boot`: 
+	`boot` can load 8 sectors (4KB) of loader (not 1 sector). 
 
diff --git a/boot/x86/boot.asm b/boot/x86/boot.asm
index 8b09f3d..e32a117 100644
--- a/boot/x86/boot.asm
+++ b/boot/x86/boot.asm
@@ -71,21 +71,40 @@ load_loader:
 	mov cl, 0x02
 	mov bx, 0x8000
 
+.read_loop:
 	call read_sector_chs
 
 	mov di, diskpanic_message
 
 	jc .try_lba
 
+; read 8 sectors
+	add cl, 0x02
+	add bx, 0x0200
+
+	cmp cl, 0x0a
+	je .ret
+
+	jmp .read_loop
+
+.ret:
 	ret
+	
 
 .try_lba:
-	mov cl, 0x02
-	mov bx, 0x8000
 	call read_sector_lba
 
 	jc panic
-	ret
+
+	add cl, 0x02
+	add bx, 0x0200
+	
+	cmp cl, 0x0a
+	je .ret
+	
+	jmp .read_loop
+	
+	
 
 read_sector_chs:
 	mov ax, 0x0201
-- 
GitLab