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Diffstat (limited to 'include/asm-cris/arch-v10/processor.h')
-rw-r--r--include/asm-cris/arch-v10/processor.h62
1 files changed, 62 insertions, 0 deletions
diff --git a/include/asm-cris/arch-v10/processor.h b/include/asm-cris/arch-v10/processor.h
new file mode 100644
index 00000000000..9355d8675a5
--- /dev/null
+++ b/include/asm-cris/arch-v10/processor.h
@@ -0,0 +1,62 @@
+#ifndef __ASM_CRIS_ARCH_PROCESSOR_H
+#define __ASM_CRIS_ARCH_PROCESSOR_H
+
+/*
+ * Default implementation of macro that returns current
+ * instruction pointer ("program counter").
+ */
+#define current_text_addr() ({void *pc; __asm__ ("move.d $pc,%0" : "=rm" (pc)); pc; })
+
+/* CRIS has no problems with write protection */
+#define wp_works_ok 1
+
+/* CRIS thread_struct. this really has nothing to do with the processor itself, since
+ * CRIS does not do any hardware task-switching, but it's here for legacy reasons.
+ * The thread_struct here is used when task-switching using _resume defined in entry.S.
+ * The offsets here are hardcoded into _resume - if you change this struct, you need to
+ * change them as well!!!
+*/
+
+struct thread_struct {
+ unsigned long ksp; /* kernel stack pointer */
+ unsigned long usp; /* user stack pointer */
+ unsigned long dccr; /* saved flag register */
+};
+
+/*
+ * User space process size. This is hardcoded into a few places,
+ * so don't change it unless you know what you are doing.
+ */
+
+#ifdef CONFIG_CRIS_LOW_MAP
+#define TASK_SIZE (0x50000000UL) /* 1.25 GB */
+#else
+#define TASK_SIZE (0xA0000000UL) /* 2.56 GB */
+#endif
+
+#define INIT_THREAD { \
+ 0, 0, 0x20 } /* ccr = int enable, nothing else */
+
+#define KSTK_EIP(tsk) \
+({ \
+ unsigned long eip = 0; \
+ unsigned long regs = (unsigned long)user_regs(tsk); \
+ if (regs > PAGE_SIZE && \
+ virt_addr_valid(regs)) \
+ eip = ((struct pt_regs *)regs)->irp; \
+ eip; \
+})
+
+/* give the thread a program location
+ * set user-mode (The 'U' flag (User mode flag) is CCR/DCCR bit 8)
+ * switch user-stackpointer
+ */
+
+#define start_thread(regs, ip, usp) do { \
+ set_fs(USER_DS); \
+ regs->irp = ip; \
+ regs->dccr |= 1 << U_DCCR_BITNR; \
+ wrusp(usp); \
+} while(0)
+
+#endif