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Subject[PATCH] Cyrix setup
Date
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Here we go for a new Cyrix patch.
Indeed, many Cyrix users use the K.Gadeyne's set6x86 program with a simple
rc script in order to enable several 6x86 features at bootup. So why not
just merging these initializations in the kernel ?

Patch for 2.1.89 follows :


-----------------------------[Cut here]-----------------------------
diff --recursive -u linux-2.1.89/Documentation/Configure.help linux/Documentation/Configure.help
--- linux-2.1.89/Documentation/Configure.help Sun Mar 8 20:28:19 1998
+++ linux-2.1.89-cyrix/Documentation/Configure.help Sun Mar 8 20:12:34 1998
@@ -7588,6 +7588,38 @@
from the running kernel whenever you want). If you want to compile
it as a module, say M here and read Documentation/modules.txt.

+Processor-specific optimizations (experimental)
+CONFIG_MOPTS
+ Say Y if you want to use some nice features of your CPU (usually disabled
+ for compatibility reasons) in order to speed up a bit your box.
+ Please disable that option if you experiment any problem at bootup.
+
+Cyrix 6x86+ optimizations
+CONFIG_CYRIX_OPTS
+ These optimizations are available from Cyrix 6x86 CPUs to newer ones,
+ like M2. You might want to say Y here and select all the following options.
+
+Suspend-on-halt
+CONFIG_CYRIX_OPTS_SOH
+ By default, your CPU will eat a lot of power, even when it doesn't do
+ anything. Enabling that option will help you reduce the CPU temperature,
+ reduce your energy needs and maybe improve the overall performances. It's a
+ safe bet to say Y here.
+
+Fast ADS
+CONFIG_CYRIX_OPTS_FASTADS
+ If you own a 6x86 CPU, try this option to speed it up.
+
+Fast FASTIORTDTE
+CONFIG_CYRIX_OPTS_FASTIORTDTE
+ If you own a 6x86 CPU, try this option to speed it up.
+
+Fast LOOP
+CONFIG_CYRIX_OPTS_FASTLOOP
+ The LOOP instruction, in newer releases of 6x86 CPUs, was slowed down for
+ software compatibilities issues. As Linux doesn't seem to need such a
+ kludge, say Y to use the Cyrix optimized LOOP code.
+
# need an empty line after last entry, for sed script in Configure.

#
diff --recursive -u linux-2.1.89/arch/i386/config.in linux/arch/i386/config.in
--- linux-2.1.89/arch/i386/config.in Tue Feb 3 00:18:15 1998
+++ linux-2.1.89-cyrix/arch/i386/config.in Sun Mar 8 20:01:16 1998
@@ -17,6 +17,18 @@
Pentium/K5/5x86/6x86 CONFIG_M586 \
PPro/K6/6x86MX CONFIG_M686" Pentium
bool 'Math emulation' CONFIG_MATH_EMULATION
+if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
+ bool 'Processor-specific optimizations (experimental)' CONFIG_MOPTS
+ if [ "$CONFIG_MOPTS" = "y" ]; then
+ bool 'Cyrix 6x86+ optimizations' CONFIG_CYRIX_OPTS
+ if [ "$CONFIG_CYRIX_OPTS" = "y" ]; then
+ bool 'Suspend-on-halt' CONFIG_CYRIX_OPTS_SOH
+ bool 'Fast ADS' CONFIG_CYRIX_OPTS_FASTADS
+ bool 'Fast IORT / Enable DTE' CONFIG_CYRIX_OPTS_FASTIORTDTE
+ bool 'Fast LOOP' CONFIG_CYRIX_OPTS_FASTLOOP
+ fi
+ fi
+fi
endmenu

mainmenu_option next_comment
diff --recursive -u linux-2.1.89/arch/i386/kernel/head.S linux/arch/i386/kernel/head.S
--- linux-2.1.89/arch/i386/kernel/head.S Sun Feb 15 21:11:23 1998
+++ linux-2.1.89-cyrix/arch/i386/kernel/head.S Sun Mar 8 21:16:56 1998
@@ -8,6 +8,7 @@
*/

.text
+#include <linux/autoconf.h>
#include <linux/tasks.h>
#include <linux/linkage.h>
#include <asm/segment.h>
@@ -201,6 +202,48 @@
movb %al,%bl
setCx86($0xe8,%bl)

+/*
+ * Cyrix basic optimizations (Frank Denis/Koen Gadeyne)
+ */
+
+#if defined (CONFIG_MOPTS) && defined (CONFIG_CYRIX_OPTS)
+# ifdef CONFIG_CYRIX_OPTS_SOH
+ getCx86($0xc2)
+ orb $0x08,%al # Suspend-on-halt
+# endif
+# ifdef CONFIG_CYRIX_OPTS_FASTADS
+ andb $0xfd,%al # Fast ADS
+# endif
+ movb %al,%bl
+ setCx86($0xc2,%bl)
+# ifdef CONFIG_CYRIX_OPTS_FASTIORTDTE
+ getCx86($0xe8)
+ orb $0x17,%al # Fast IORT and enable DTE
+ movb %al,%bl
+ setCx86($0xe8,%bl)
+# endif
+# ifdef CONFIG_CYRIX_OPTS_FASTLOOP
+ getCx86($0xe9)
+ andb $0xfd,%al # Fast LOOP
+ movb %al,%bl
+ setCx86($0xe9,%bl)
+# endif
+ pushl %ecx
+ pushl %edx
+ push %es
+ push %ds
+ movl $(__KERNEL_DS),%eax
+ mov %ax,%ds
+ mov %ax,%es
+ pushl $cyr_msg
+ call SYMBOL_NAME(printk)
+ popl %eax
+ pop %ds
+ pop %es
+ popl %edx
+ popl %ecx
+#endif
+
setCx86($0xc3,%cl) # Restore old CCR3

ncyrix: movl $3,X86 # at least 386
@@ -338,6 +381,10 @@
L6:
jmp L6 # main should never return here, but
# just in case, we know what happens.
+
+cyr_msg:
+ .asciz "Cyrix optimizations enabled.\n"
+ ALIGN

#ifdef __SMP__
ready: .byte 0
-----------------------------[Cut here]-----------------------------

Best regards, Frank.

--
If you have men who will exclude any of god's creatures from the shelter of
compassion and pity, you will have men who will deal likewise with their
fellow men. -St.Francis of Assisi. -=- Frank DENIS Email : ange@angelic.com

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