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Subject[PATCH][2.5.35] CPUfreq i386 core (2/5)
CPUFreq i386 core for 2.5.35:
arch/i386/kernel/i386_ksyms.c export cpu_khz
arch/i386/kernel/time.c update various i386 values on frequency
changes
include/asm-i386/msr.h add Transmeta MSR defines


diff -ruN linux-2535original/arch/i386/kernel/i386_ksyms.c linux/arch/i386/kernel/i386_ksyms.c
--- linux-2535original/arch/i386/kernel/i386_ksyms.c Tue Sep 17 09:22:43 2002
+++ linux/arch/i386/kernel/i386_ksyms.c Tue Sep 17 09:30:59 2002
@@ -50,6 +50,7 @@
EXPORT_SYMBOL(drive_info);
#endif

+extern unsigned long cpu_khz;
extern unsigned long get_cmos_time(void);

/* platform dependent support */
@@ -76,6 +77,7 @@
EXPORT_SYMBOL(pm_idle);
EXPORT_SYMBOL(pm_power_off);
EXPORT_SYMBOL(get_cmos_time);
+EXPORT_SYMBOL(cpu_khz);
EXPORT_SYMBOL(apm_info);

#ifdef CONFIG_DEBUG_IOVIRT
diff -ruN linux-2535original/arch/i386/kernel/time.c linux/arch/i386/kernel/time.c
--- linux-2535original/arch/i386/kernel/time.c Tue Sep 17 09:24:52 2002
+++ linux/arch/i386/kernel/time.c Tue Sep 17 09:30:59 2002
@@ -43,6 +43,7 @@
#include <linux/smp.h>
#include <linux/module.h>
#include <linux/device.h>
+#include <linux/cpufreq.h>

#include <asm/io.h>
#include <asm/smp.h>
@@ -651,6 +652,52 @@

__initcall(time_init_driverfs);

+
+#ifdef CONFIG_CPU_FREQ
+
+static int
+time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
+ void *data)
+{
+ struct cpufreq_freqs *freq = data;
+ unsigned int i;
+
+ if (!cpu_has_tsc)
+ return 0;
+
+ switch (val) {
+ case CPUFREQ_PRECHANGE:
+ if ((freq->old < freq->new) &&
+ ((freq->cpu == CPUFREQ_ALL_CPUS) || (freq->cpu == 0))) {
+ cpu_khz = cpufreq_scale(cpu_khz, freq->old, freq->new);
+ fast_gettimeoffset_quotient = cpufreq_scale(fast_gettimeoffset_quotient, freq->new, freq->old);
+ }
+ for (i=0; i<NR_CPUS; i++)
+ if ((freq->cpu == CPUFREQ_ALL_CPUS) || (freq->cpu == i))
+ cpu_data[i].loops_per_jiffy = cpufreq_scale(loops_per_jiffy, freq->old, freq->new);
+ break;
+
+ case CPUFREQ_POSTCHANGE:
+ if ((freq->new < freq->old) &&
+ ((freq->cpu == CPUFREQ_ALL_CPUS) || (freq->cpu == 0))) {
+ cpu_khz = cpufreq_scale(cpu_khz, freq->old, freq->new);
+ fast_gettimeoffset_quotient = cpufreq_scale(fast_gettimeoffset_quotient, freq->new, freq->old);
+ }
+ for (i=0; i<NR_CPUS; i++)
+ if ((freq->cpu == CPUFREQ_ALL_CPUS) || (freq->cpu == i))
+ cpu_data[i].loops_per_jiffy = cpufreq_scale(loops_per_jiffy, freq->old, freq->new);
+ break;
+ }
+
+ return 0;
+}
+
+static struct notifier_block time_cpufreq_notifier_block = {
+ notifier_call: time_cpufreq_notifier
+};
+#endif
+
+
void __init time_init(void)
{
extern int x86_udelay_tsc;
@@ -710,6 +757,9 @@
"0" (eax), "1" (edx));
printk("Detected %lu.%03lu MHz processor.\n", cpu_khz / 1000, cpu_khz % 1000);
}
+#ifdef CONFIG_CPU_FREQ
+ cpufreq_register_notifier(&time_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER);
+#endif
}
}

diff -ruN linux-2535original/include/asm-i386/msr.h linux/include/asm-i386/msr.h
--- linux-2535original/include/asm-i386/msr.h Tue Sep 17 09:23:54 2002
+++ linux/include/asm-i386/msr.h Tue Sep 17 09:30:59 2002
@@ -125,4 +125,8 @@
#define MSR_VIA_LONGHAUL 0x110a
#define MSR_VIA_BCR2 0x1147

+/* Transmeta defined MSRs */
+#define MSR_TMTA_LONGRUN_CTRL 0x80868010
+#define MSR_TMTA_LONGRUN_FLAGS 0x80868011
+
#endif /* __ASM_MSR_H */
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