From c540194c6a3e836a364aa817f90fdc8c49968464 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Thu, 27 Nov 2014 01:04:02 +0000 Subject: [PATCH] 6809: add mulhi We need this for load average computation --- Kernel/lowlevel-6809.s | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/Kernel/lowlevel-6809.s b/Kernel/lowlevel-6809.s index bf55c3ed..2fdd9bb0 100644 --- a/Kernel/lowlevel-6809.s +++ b/Kernel/lowlevel-6809.s @@ -12,6 +12,7 @@ .globl _euclid .globl _udivhi3 .globl _umodhi3 + .globl _mulhi3 ; debugging aids .globl outcharhex @@ -462,3 +463,23 @@ mod3: bne mod1 leas 3,s rts + +_mulhi3: + pshs x + lda 5,s ; left msb * right lsb * 256 + ldb ,s + mul + tfr b,a + clrb + tfr d,x + ldb 1,s ; left lsb * right msb * 256 + lda 4,s + mul + tfr b,a + clrb + leax d,x + ldb 1,s ; left lsb * right lsb + lda 5,s + mul + leax d,x + puls d,pc ; kill D to remove initial push -- 2.34.1