1 files changed, 42 insertions, 0 deletions
diff --git a/boot1/hardware.asm b/boot1/hardware.asm
new file mode 100644
index 0000000..b7ac3af
--- /dev/null
+++ b/boot1/hardware.asm
@@ -0,0 +1,42 @@
+[BITS 16]
+;;; Call BIOS to populate equipment bitv in the HARDWARE buffer.
+GET_EQUIPMENT_LIST:
+        xor ax, ax
+        int 0x11
+        mov [wEquipmentBitvector], ax
+        ret
+
+;;; Call BIOS to get the system memory size.
+GET_MEMORY_SIZE:
+        xor ax, ax
+        mov ah, 0x88
+        int 0x15
+        add ax, 1024
+        mov [wMemorySize], ax
+        ret
+        
+GET_TIME:
+        xor ax, ax
+        int 0x1a
+        push es
+        push si
+        mov es, cx
+        mov si, dx
+        mov cx, WORD [es:si]
+        mov [wSystemClock], cx
+        pop si
+        pop es
+        ret
+
+; Enable the A20 address line, so we can correctly address
+; memory above 1MB.
+ENABLE_A20:     
+        mov	al, 0xD1
+        out	0x64, al
+        nop
+        jmp .here
+.here:  mov	al, 0xDF
+        out	0x60, al
+        nop
+        jmp .there
+.there: ret