From a0ea232b7c405690419dd9f2136ea49667a5cb94 Mon Sep 17 00:00:00 2001
From: Nathan Frost <41307858+nero@users.noreply.github.com>
Date: Mon, 24 Jun 2019 16:50:51 +0000
Subject: [PATCH] Remove attempt of ramdisk layer

---
 kernel/ramdisk.inc | 86 ----------------------------------------------
 1 file changed, 86 deletions(-)
 delete mode 100644 kernel/ramdisk.inc

diff --git a/kernel/ramdisk.inc b/kernel/ramdisk.inc
deleted file mode 100644
index b864051..0000000
--- a/kernel/ramdisk.inc
+++ /dev/null
@@ -1,86 +0,0 @@
-; Spanning whole conventional memory
-; Sector size 0x200 (512 bytes)
-; Start address 0x00600, 3 hidden sectors for IVT and BDA
-; Kernel .data may be in reserved sectors
-
-; Ramdisk I/O, similar invocation to BIOS int 13h
-; in	AH	42=read, 43=write
-; in    DS:SI   location of disk address packet
-; out	AH	error code or 00 (also in CF)
-ramdisk_io:
-  ; backup original values
-  push cx
-  push dx
-  push si
-  push di
-  push ds
-  push es
-
-  ; 3 most significant addr bytes must be all zero
-  test WORD [ds:si+0x0E], 0xFFFF
-  jnz .invaddr
-  test WORD [ds:si+0x0C], 0xFFFF
-  jnz .invaddr
-  test WORD [ds:si+0x0A], 0xFFFF
-  jnz .invaddr
-
-  ; calculate segment register for ramdisk access
-  mov dx, [ds:si+0x08]
-  cmp dx, 0x07fd ; 0x800 sectors in adress space, 3 hidden
-  jge .invaddr
-  mov cl, 0x05 ; 2^5 = 32 paragraphs per sector
-  sal dx, cl
-  add dx, 0x0060 ; 3 hidden sectors
-  xor cx, cx
-  push cx ; offset = 0
-  push dx ; segment
-
-  ; store addresses for buffer access
-  mov dx, [ds:si+0x04]
-  push dx ; offset
-  mov dx, [ds:si+0x06]
-  push dx ; segment
-
-  ; setup transfer length (in words) in CX
-  mov dx, [ds:si+0x02] ; sector count
-  mov cx, 0x0008 ; 2^8 = 256 words per sector
-  sal dx, cl
-  xchg dx, cx
-
-  cmp ah, 0x42
-  je .read
-  cmp ah, 0x43
-  je .write
-  sub sp, 8 ; remove src & dst pointers from stack
-.invval:
-  mov ah, 0x01
-  stc
-  jmp .ret
-.invaddr: ; out of bounds
-  mov ah, 0x04
-  stc
-  jmp .ret
-.read:
-  pop es ; ES:DI buffer
-  pop di
-  pop ds ; DS:SI ramdisk data
-  pop si
-  rep movsw
-  clc
-  jmp .ret
-.write:
-  pop ds ; DS:SI buffer
-  pop si
-  pop es ; ES:DI ramdisk data
-  pop di
-  rep movsw
-  clc
-.ret:
-  ; restore backupped values
-  pop es
-  pop ds
-  pop di
-  pop si
-  pop dx
-  pop cx
-  ret
\ No newline at end of file