From 9143073dd351f806e8f793e19fa80fc32f12e279 Mon Sep 17 00:00:00 2001
From: mykola2312 <49044616+mykola2312@users.noreply.github.com>
Date: Wed, 7 Aug 2024 09:19:52 +0300
Subject: [PATCH] begin working on test bios disk reading subroutine

---
 Makefile             |  2 +-
 src/test_disk_read.s | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 src/test_disk_read.s

diff --git a/Makefile b/Makefile
index 3b0dfad..b827810 100644
--- a/Makefile
+++ b/Makefile
@@ -97,7 +97,7 @@ $(OBJ_DIR)/%.o: $(SRC_DIR)/%.s
 	$(AS) $(ASFLAGS) -o $@ $<
 	$(OBJCOPY) --remove-section .note.gnu.property $@
 
-MBR_TEST_OBJ		=	obj/mbr_test.o obj/serial.o obj/itoa.o obj/util.o obj/test_disk_params.o
+MBR_TEST_OBJ		=	obj/mbr_test.o obj/serial.o obj/itoa.o obj/util.o obj/test_disk_target.o
 
 mbr_test: $(MBR_TEST_OBJ) $(DISK)
 	$(LD) -T src/mbr_test.ld -o $(BIN_DIR)/mbr_test.bin $(MBR_TEST_OBJ)
diff --git a/src/test_disk_read.s b/src/test_disk_read.s
new file mode 100644
index 0000000..cb75fc1
--- /dev/null
+++ b/src/test_disk_read.s
@@ -0,0 +1,24 @@
+.section .text
+.code16
+
+.globl test_disk_read
+
+# eax   - LBA address
+# cx    - number of sectors
+# es:di - destination
+test_disk_read:
+    # here we need to convert LBA into CHS
+    ret
+
+# ds:si - sector
+test_disk_taste_sector:
+    # test pattern partition - each sector has 32 bit integer in beginning
+    # so we read this integer and output it, it must increment as well as LBA address
+    lodsd # load 32 bit into eax
+    mov $str_taste, %si
+    call prints_number
+
+    ret
+
+.section .rodata
+str_taste:  .asciz  "Sector test pattern: "