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Subject[ANNC] Linld 0.94 available
Date
I just made next version of Linld: 0.94

http://port.imtp.ilyichevsk.odessa.ua/linux/vda/linld/linld094.tar.bz2
(20k)
http://port.imtp.ilyichevsk.odessa.ua/linux/vda/linld/linld_devel.tar.bz2
(500k)

Changelog
---------
0.91 Added support for cl=@filename
0.92 VCPI vodoo magic: booting under EMM386 and foes :-)
0.93 Cleanup. cl=@filename: cr/lf will be converted to two spaces
0.94 Ugly workaround for DOS int 15 fn 88 breakage

I believe this workaround really should be placed in kernel:
some day we will meet BIOS with same breakage!
It also looks much less ugly there. Example patch against 2.4.16-pre1
attached. Yes, there are some unrelated code cleanup (shorter instructions,
same effect - can't resist :-).
--
vda

--- setup.S.orig Fri Nov 9 19:58:02 2001
+++ setup.S Wed Nov 28 11:42:00 2001
@@ -328,12 +328,10 @@
jnl bail820

incb (E820NR)
- movw %di, %ax
- addw $20, %ax
- movw %ax, %di
+ addw $20, %di
again820:
- cmpl $0, %ebx # check to see if
- jne jmpe820 # %ebx is set to EOF
+ testl %ebx, %ebx # check to see if
+ jnz jmpe820 # %ebx is set to EOF
bail820:


@@ -356,28 +354,62 @@
int $0x15
jc mem88

- cmpw $0x0, %cx # Kludge to handle BIOSes
- jne e801usecxdx # which report their extended
- cmpw $0x0, %dx # memory in AX/BX rather than
- jne e801usecxdx # CX/DX. The spec I have read
+ testw %cx, %cx # Kludge to handle BIOSes
+ jnz e801usecxdx # which report their extended
+ testw %dx, %dx # memory in AX/BX rather than
+ jnz e801usecxdx # CX/DX. The spec I have read
movw %ax, %cx # seems to indicate AX/BX
movw %bx, %dx # are more reasonable anyway...

e801usecxdx:
- andl $0xffff, %edx # clear sign extend
+ movzwl %dx, %edx # clear sign extend
shll $6, %edx # and go from 64k to 1k chunks
- movl %edx, (0x1e0) # store extended memory size
- andl $0xffff, %ecx # clear sign extend
- addl %ecx, (0x1e0) # and add lower memory into
- # total size.
+ movzwl %cx, %ecx # clear sign extend
+ addl %ecx, %edx # add lower memory to
+ movl %edx, (0x1e0) # extended, store

# Ye Olde Traditional Methode. Returns the memory size (up to 16mb or
# 64mb, depending on the bios) in ax.
mem88:

#endif
+ #stc # guard against brain damage -
+ # int 15 must clear cf to indicate success
+ clc # unbelievable: some BIOSes/DOSes can leave
+ # cf as is so I had to abandon stc trick
movb $0x88, %ah
int $0x15
+ jc mem_cmos
+ testw %ax, %ax
+ jnz mem_store
+
+# Fallback: if int15/88 fails, get same data from CMOS
+# this works around extremely stupid case I had with PC not booting
+# from DOS when I put 196 megs of RAM in it
+# (it reported 0 via int15/e801 and int15/88)
+# Also this makes unnecessary for loadlin to jump thru the hoops
+# just in order to let us know ext mem size
+# (it hooks itself on int 15/88 and does CMOS reads for us)
+mem_cmos:
+ pushf
+ cli
+ movb $0x18, %al
+ outb %al, $0x70
+ #iodelay?
+ inb $0x71, %al
+ movb %al, %ah
+ #iodelay?
+ movb $0x17, %al
+ outb %al, $0x70
+ #iodelay?
+ inb $0x71, %al
+ popf
+
+mem_store:
+ cmpw $0xffff-0x400, %ax # We want to be sure it won't roll over
+ jbe mem_store2 # 16 bit value when low 1024k gets added
+ movw $0xffff-0x400, %ax # thus max memtop is 0xffff*1k = 64m-1k
+mem_store2:
movw %ax, (2)

# Set the keyboard repeat rate to the max
-
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