Import changeset

1 files changed, 152 insertions, 0 deletions

diff --git a/include/asm-alpha/processor.h b/include/asm-alpha/processor.h
new file mode 100644
index 000000000000..49f228f3f1be
--- /dev/null
+++ b/include/asm-alpha/processor.h
@@ -0,0 +1,152 @@
+/*
+ * include/asm-alpha/processor.h
+ *
+ * Copyright (C) 1994 Linus Torvalds
+ */
+
+#ifndef __ASM_ALPHA_PROCESSOR_H
+#define __ASM_ALPHA_PROCESSOR_H
+
+/*
+ * Returns current instruction pointer ("program counter").
+ */
+#define current_text_addr() \
+  ({ void *__pc; __asm__ ("br %0,.+4" : "=r"(__pc)); __pc; })
+
+/*
+ * We have a 42-bit user address space: 4TB user VM...
+ */
+#define TASK_SIZE (0x40000000000UL)
+
+/* This decides where the kernel will search for a free chunk of vm
+ * space during mmap's.
+ */
+#define TASK_UNMAPPED_BASE \
+  ((current->personality & ADDR_LIMIT_32BIT) ? 0x40000000 : TASK_SIZE / 2)
+
+/*
+ * Bus types
+ */
+#define EISA_bus 1
+#define EISA_bus__is_a_macro /* for versions in ksyms.c */
+#define MCA_bus 0
+#define MCA_bus__is_a_macro /* for versions in ksyms.c */
+
+typedef struct {
+	unsigned long seg;
+} mm_segment_t;
+
+struct thread_struct {
+	/* the fields below are used by PALcode and must match struct pcb: */
+	unsigned long ksp;
+	unsigned long usp;
+	unsigned long ptbr;
+	unsigned int pcc;
+	unsigned int asn;
+	unsigned long unique;
+	/*
+	 * bit  0: floating point enable
+	 * bit 62: performance monitor enable
+	 */
+	unsigned long pal_flags;
+	unsigned long res1, res2;
+
+	/*
+	 * The fields below are Linux-specific:
+	 *
+	 * bit 1..5: IEEE_TRAP_ENABLE bits (see fpu.h)
+	 * bit 6..8: UAC bits (see sysinfo.h)
+	 * bit 17..21: IEEE_STATUS_MASK bits (see fpu.h)
+	 * bit 63: die_if_kernel recursion lock
+	 */
+	unsigned long flags;
+
+	/* Perform syscall argument validation (get/set_fs). */
+	mm_segment_t fs;
+
+	/* Breakpoint handling for ptrace.  */
+	unsigned long bpt_addr[2];
+	unsigned int bpt_insn[2];
+	int bpt_nsaved;
+};
+
+#define INIT_MMAP { &init_mm, PAGE_OFFSET,  PAGE_OFFSET+0x10000000, \
+	NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
+
+#define INIT_THREAD  { \
+	0, 0, 0, \
+	0, 0, 0, \
+	0, 0, 0, \
+	0, \
+	KERNEL_DS \
+}
+
+#define THREAD_SIZE (2*PAGE_SIZE)
+
+#include <asm/ptrace.h>
+
+/*
+ * Return saved PC of a blocked thread.  This assumes the frame
+ * pointer is the 6th saved long on the kernel stack and that the
+ * saved return address is the first long in the frame.  This all
+ * holds provided the thread blocked through a call to schedule() ($15
+ * is the frame pointer in schedule() and $15 is saved at offset 48 by
+ * entry.S:do_switch_stack).
+ *
+ * Under heavy swap load I've seen this lose in an ugly way.  So do
+ * some extra sanity checking on the ranges we expect these pointers
+ * to be in so that we can fail gracefully.  This is just for ps after
+ * all.  -- r~
+ */
+extern inline unsigned long thread_saved_pc(struct thread_struct *t)
+{
+	unsigned long fp, sp = t->ksp, base = (unsigned long)t;
+ 
+	if (sp > base && sp+6*8 < base + 16*1024) {
+		fp = ((unsigned long*)sp)[6];
+		if (fp > sp && fp < base + 16*1024)
+			return *(unsigned long *)fp;
+	}
+
+	return 0;
+}
+
+/* Do necessary setup to start up a newly executed thread.  */
+extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
+
+struct task_struct;
+
+/* Free all resources held by a thread. */
+extern void release_thread(struct task_struct *);
+
+/* Create a kernel thread without removing it from tasklists.  */
+extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
+
+#define copy_segments(tsk, mm)		do { } while (0)
+#define release_segments(mm)		do { } while (0)
+
+unsigned long get_wchan(struct task_struct *p);
+
+/* See arch/alpha/kernel/ptrace.c for details.  */
+#define PT_REG(reg)	(PAGE_SIZE*2 - sizeof(struct pt_regs)		\
+			 + (long)&((struct pt_regs *)0)->reg)
+
+#define SW_REG(reg)	(PAGE_SIZE*2 - sizeof(struct pt_regs)		\
+			 - sizeof(struct switch_stack)			\
+			 + (long)&((struct switch_stack *)0)->reg)
+
+#define KSTK_EIP(tsk) \
+    (*(unsigned long *)(PT_REG(pc) + (unsigned long)(tsk)))
+
+#define KSTK_ESP(tsk)	((tsk) == current ? rdusp() : (tsk)->thread.usp)
+
+/* NOTE: The task struct and the stack go together!  */
+#define alloc_task_struct() \
+        ((struct task_struct *) __get_free_pages(GFP_KERNEL,1))
+#define free_task_struct(p)     free_pages((unsigned long)(p),1)
+#define get_task_struct(tsk)      atomic_inc(&virt_to_page(tsk)->count)
+
+#define init_task	(init_task_union.task)
+#define init_stack	(init_task_union.stack)
+
+#endif /* __ASM_ALPHA_PROCESSOR_H */