1 files changed, 158 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/processor.h b/arch/blackfin/include/asm/processor.h
new file mode 100644
index 0000000..6f3995b
--- /dev/null
+++ b/arch/blackfin/include/asm/processor.h
@@ -0,0 +1,158 @@
+#ifndef __ASM_BFIN_PROCESSOR_H
+#define __ASM_BFIN_PROCESSOR_H
+
+/*
+ * Default implementation of macro that returns current
+ * instruction pointer ("program counter").
+ */
+#define current_text_addr() ({ __label__ _l; _l: &&_l;})
+
+#include <asm/blackfin.h>
+#include <asm/segment.h>
+#include <linux/compiler.h>
+
+static inline unsigned long rdusp(void)
+{
+	unsigned long usp;
+
+	__asm__ __volatile__("%0 = usp;\n\t":"=da"(usp));
+	return usp;
+}
+
+static inline void wrusp(unsigned long usp)
+{
+	__asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
+}
+
+/*
+ * User space process size: 1st byte beyond user address space.
+ * Fairly meaningless on nommu.  Parts of user programs can be scattered
+ * in a lot of places, so just disable this by setting it to 0xFFFFFFFF.
+ */
+#define TASK_SIZE	0xFFFFFFFF
+
+#ifdef __KERNEL__
+#define STACK_TOP	TASK_SIZE
+#endif
+
+#define TASK_UNMAPPED_BASE	0
+
+struct thread_struct {
+	unsigned long ksp;	/* kernel stack pointer */
+	unsigned long usp;	/* user stack pointer */
+	unsigned short seqstat;	/* saved status register */
+	unsigned long esp0;	/* points to SR of stack frame pt_regs */
+	unsigned long pc;	/* instruction pointer */
+	void *        debuggerinfo;
+};
+
+#define INIT_THREAD  {						\
+	sizeof(init_stack) + (unsigned long) init_stack, 0,	\
+	PS_S, 0, 0						\
+}
+
+/*
+ * Do necessary setup to start up a newly executed thread.
+ *
+ * pass the data segment into user programs if it exists,
+ * it can't hurt anything as far as I can tell
+ */
+#define start_thread(_regs, _pc, _usp)					\
+do {									\
+	set_fs(USER_DS);						\
+	(_regs)->pc = (_pc);						\
+	if (current->mm)						\
+		(_regs)->p5 = current->mm->start_data;			\
+	task_thread_info(current)->l1_task_info.stack_start		\
+		= (void *)current->mm->context.stack_start;		\
+	task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \
+	memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \
+		sizeof(*L1_SCRATCH_TASK_INFO));				\
+	wrusp(_usp);							\
+} while(0)
+
+/* Forward declaration, a strange C thing */
+struct task_struct;
+
+/* Free all resources held by a thread. */
+static inline void release_thread(struct task_struct *dead_task)
+{
+}
+
+#define prepare_to_copy(tsk)	do { } while (0)
+
+extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
+
+/*
+ * Free current thread data structures etc..
+ */
+static inline void exit_thread(void)
+{
+}
+
+/*
+ * Return saved PC of a blocked thread.
+ */
+#define thread_saved_pc(tsk)	(tsk->thread.pc)
+
+unsigned long get_wchan(struct task_struct *p);
+
+#define	KSTK_EIP(tsk)							\
+    ({									\
+	unsigned long eip = 0;						\
+	if ((tsk)->thread.esp0 > PAGE_SIZE &&				\
+	    MAP_NR((tsk)->thread.esp0) < max_mapnr)			\
+	      eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc;	\
+	eip; })
+#define	KSTK_ESP(tsk)	((tsk) == current ? rdusp() : (tsk)->thread.usp)
+
+#define cpu_relax()    	barrier()
+
+/* Get the Silicon Revision of the chip */
+static inline uint32_t __pure bfin_revid(void)
+{
+	/* stored in the upper 4 bits */
+	uint32_t revid = bfin_read_CHIPID() >> 28;
+
+#ifdef CONFIG_BF52x
+	/* ANOMALY_05000357
+	 * Incorrect Revision Number in DSPID Register
+	 */
+	if (revid == 0)
+		switch (bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI)) {
+		case 0x0010:
+			revid = 0;
+			break;
+		case 0x2796:
+			revid = 1;
+			break;
+		default:
+			revid = 0xFFFF;
+			break;
+		}
+#endif
+	return revid;
+}
+
+static inline uint32_t __pure bfin_compiled_revid(void)
+{
+#if defined(CONFIG_BF_REV_0_0)
+	return 0;
+#elif defined(CONFIG_BF_REV_0_1)
+	return 1;
+#elif defined(CONFIG_BF_REV_0_2)
+	return 2;
+#elif defined(CONFIG_BF_REV_0_3)
+	return 3;
+#elif defined(CONFIG_BF_REV_0_4)
+	return 4;
+#elif defined(CONFIG_BF_REV_0_5)
+	return 5;
+#elif defined(CONFIG_BF_REV_ANY)
+	return 0xffff;
+#else
+	return -1;
+#endif
+}
+
+#endif