Additional optimizations. Do an ls -l in the Makefile so we know just

how much we bloat the code.

diff --git a/Makefile b/Makefile
index 0739907..5fcc540 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -21,12 +21,14 @@ all:        bootsect.bin ldlinux.sys
 
 ldlinux.bin: ldlinux.asm
        $(NASM) -f bin -dHEX_TIME="`perl now.pl`" -l ldlinux.lst -o ldlinux.bin ldlinux.asm
+       ls -l ldlinux.bin
 
 bootsect.bin: ldlinux.bin
        dd if=ldlinux.bin of=bootsect.bin bs=512 count=1
 
 ldlinux.sys: ldlinux.bin
        dd if=ldlinux.bin of=ldlinux.sys  bs=512 skip=1
+       ls -l ldlinux.sys
 
 clean:
        rm -f *.bin *.lst *.sys

diff --git a/ldlinux.asm b/ldlinux.asm
index 7113b9b..ac99da8 100644 (file)
--- a/ldlinux.asm
+++ b/ldlinux.asm
@@ -691,7 +691,7 @@ ldlinux_ent:
                mov ax,[bsHidden1]              ; Hidden sectors
                mov dx,[bsHidden2]
                add ax,[bsResSectors]           ; plus reserved sectors = FAT
-               adc dx,0
+               adc dx,byte 0
                mov bp,[bsFATsecs]              ; Sectors/FAT
                call getlinsec                  ; Load it in...
 ;
@@ -996,7 +996,7 @@ pc_app1:        mov [AppendLen],di
 pc_append_vk:  mov di,VKernelBuf+vk_append     ; "append" command (vkernel)
                call getline
                sub di,VKernelBuf+vk_append
-                cmp di,2
+                cmp di,byte 2
                 jne pc_app2
                 cmp byte [VKernelBuf+vk_append],'-'
                 jne pc_app2
@@ -1357,7 +1357,7 @@ kernel_good:
 ; more than 8M, we need to change the logic for loading it anyway...)
 ;
 load_it:
-                cmp dx,80h                      ; 8 megs
+                cmp dx,byte 80h                        ; 8 megs
                ja kernel_corrupt
                and dx,dx
                jz kernel_corrupt
@@ -1853,7 +1853,7 @@ rd_last_moby:
                 popf
                 jc rd_load_done                 ; EOF?
                 add word [InitRDat],100h       ; Point to next 64K
-               cmp word [InitRDClust],0        ; Are we done?
+               cmp word [InitRDClust],byte 0   ; Are we done?
                jne rd_load_loop                ; Apparently not
 rd_load_done:
                 pop si                          ; Clean up the stack
@@ -2053,13 +2053,13 @@ dir_test_name:  cmp byte [si],0         ; Directory high water mark
                pop si
                pop di
                je dir_success
-dir_not_this:   add si,32
+dir_not_this:   add si,byte 32
                dec word [DirScanCtr]
                jz dir_return           ; Out of it...
                cmp si,[EndofDirSec]
                jb dir_test_name
                add ax,bp               ; Increment linear sector number
-               adc dx,0
+               adc dx,byte 0
                jmp short scan_group
 dir_success:
                mov ax,[si+28]          ; Length of file
@@ -2116,8 +2116,8 @@ print_msg_file: push cx
                pop dx
                pop ax
                 pop cx
-               sub ax,1
-               sbb dx,0
+               sub ax,byte 1
+               sbb dx,byte 0
                mov bx,ax
                or bx,dx
                jz msg_done
@@ -2125,7 +2125,7 @@ print_msg_file: push cx
                pop si
                jmp short get_msg_chunk
 msg_done_pop:
-                add sp,6                        ; Lose 3 words on the stack
+                add sp,byte 6                  ; Lose 3 words on the stack
 msg_done:
                pop si
                ret
@@ -2214,9 +2214,9 @@ open:
                mov [FBytes1],ax
                mov [FBytes2],dx
                add ax,[ClustSize]
-               adc dx,0
-               sub ax,1
-               sbb dx,0
+               adc dx,byte 0
+               sub ax,byte 1
+               sbb dx,byte 0
                div word [ClustSize]
                mov [FClust],ax         ; Number of clusters
                mov [FNextClust],si     ; Cluster pointer
@@ -2537,7 +2537,7 @@ dumpregs  proc near               ; When calling, IP is on stack
                mov si,offset crlf
                call writestr
                mov bx,sp
-               add bx,26
+               add bx,byte 26
                mov si,offset regnames
                mov cx,2                ; 2*7 registers to dump
 dump_line:     push cx