4 files changed, 84 insertions, 0 deletions

diff --git a/arch/arm/include/asm/cycles.h b/arch/arm/include/asm/cycles.h
new file mode 100644
index 0000000..73632f8
--- /dev/null
+++ b/arch/arm/include/asm/cycles.h
@@ -0,0 +1,23 @@
+#ifndef ASM_CYCLES_H
+#define ASM_CYCLES_H
+
+typedef unsigned long cycles_t;
+
+#define CYCLES_FMT "lu"
+
+/* system call wrapper */
+int null_call(cycles_t *timestamp);
+
+static inline cycles_t get_cycles(void)
+{
+        cycles_t c;
+        /* On the ARM11 MPCore chips, userspace cannot access the cycle counter
+         * directly. So ask the kernel to read it instead. Eventually, this
+         * should support newer ARM chips that do allow accessing the cycle
+         * counter in userspace.
+         */
+        null_call(&c);
+        return c;
+}
+
+#endif
diff --git a/arch/sparc/include/asm/cycles.h b/arch/sparc/include/asm/cycles.h
new file mode 100644
index 0000000..ce0e8ce
--- /dev/null
+++ b/arch/sparc/include/asm/cycles.h
@@ -0,0 +1,16 @@
+#ifndef ASM_CYCLES_H
+#define ASM_CYCLES_H
+
+#define NPT_BIT 63
+
+typedef unsigned long cycles_t;
+
+#define CYCLES_FMT "lu"
+
+static inline cycles_t get_cycles(void) {
+        cycles_t cycles = 0;
+        __asm__ __volatile__("rd %%asr24, %0" : "=r" (cycles));
+        return cycles & ~(1UL << NPT_BIT);
+}
+
+#endif
diff --git a/arch/x86/include/asm/cycles.h b/arch/x86/include/asm/cycles.h
new file mode 100644
index 0000000..00a7593
--- /dev/null
+++ b/arch/x86/include/asm/cycles.h
@@ -0,0 +1,30 @@
+#ifndef ASM_CYCLES_H
+#define ASM_CYCLES_H
+
+#define rdtscll(val) do { \
+        unsigned int __a,__d; \
+        __asm__ __volatile__("rdtsc" : "=a" (__a), "=d" (__d)); \
+        (val) = ((unsigned long long)__a) | (((unsigned long long)__d)<<32); \
+} while(0)
+
+static __inline__ unsigned long long native_read_tsc(void)
+{
+        unsigned long long val;
+
+        __asm__ __volatile__("mfence":::"memory");
+        rdtscll(val);
+        __asm__ __volatile__("mfence":::"memory");
+
+        return val;
+}
+
+#define CYCLES_FMT "llu"
+
+typedef unsigned long long cycles_t;
+
+static inline cycles_t get_cycles(void)
+{
+        return native_read_tsc();
+}
+
+#endif
diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h
new file mode 100644
index 0000000..23f47fd
--- /dev/null
+++ b/arch/x86/include/asm/irq.h
@@ -0,0 +1,15 @@
+#ifndef ASM_IRQ_H
+#define ASM_IRQ_H
+
+/* please, use these only if you _really_ know what you're doing
+ * ... and remember iopl(3) first!! (include sys/io.h)
+ */
+static inline void cli(void) {
+        asm volatile("cli": : :"memory");
+}
+
+static inline void sti(void) {
+        asm volatile("sti": : :"memory");
+}
+
+#endif