Initial source

1 files changed, 150 insertions, 0 deletions

diff --git a/chips/frc.c b/chips/frc.c
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1993,1992 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ *	File: frc.c
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	3/92
+ *
+ *	Generic, mappable free running counter driver.
+ */
+
+#include <frc.h>
+#if	NFRC > 0
+
+#include <mach/std_types.h>
+#include <chips/busses.h>
+#include <device/device_types.h>
+
+/*
+ * Machine defines
+ * All you need to do to get this working on a
+ * random box is to define one macro and provide
+ * the correct virtual address.
+ */
+#include	<platforms.h>
+#ifdef	DECSTATION
+#define	btop(x)		mips_btop(x)
+#endif	/* DECSTATION */
+
+/*
+ * Autoconf info
+ */
+
+static vm_offset_t frc_std[NFRC] = { 0 };
+static vm_size_t frc_offset[NFRC] = { 0 };
+static struct bus_device *frc_info[NFRC];
+static int frc_probe(vm_offset_t,struct bus_ctlr *);
+static void frc_attach(struct bus_device *);
+
+struct bus_driver frc_driver =
+       { frc_probe, 0, frc_attach, 0, frc_std, "frc", frc_info, };
+
+/*
+ * Externally visible functions
+ */
+io_return_t	frc_openclose(int,int);			/* user */
+vm_offset_t	frc_mmap(int,vm_offset_t,vm_prot_t);
+void		frc_set_address(int,vm_size_t);
+
+/*
+ * FRC's in kernel virtual memory.  For in-kernel timestamps.
+ */
+vm_offset_t frc_address[NFRC];
+
+/* machine-specific setups */
+void
+frc_set_address(
+	int		unit,
+	vm_size_t	offset)
+{
+	if (unit < NFRC) {
+		frc_offset[unit] =  offset;
+	}
+}
+
+
+/*
+ * Probe chip to see if it is there
+ */
+static frc_probe (
+	vm_offset_t	reg,
+	struct bus_ctlr *ui)
+{
+	/* see if something present at the given address */
+	if (check_memory(reg, 0)) {
+		frc_address[ui->unit] = 0;
+		return 0;
+	}
+	frc_std[ui->unit] = (vm_offset_t) reg;
+	printf("[mappable] ");
+	return 1;
+}
+
+static void
+frc_attach (
+		   struct bus_device *ui)
+{
+	if (ui->unit < NFRC) {
+		frc_address[ui->unit] =
+			(vm_offset_t) frc_std[ui->unit] + frc_offset[ui->unit];
+		printf(": free running counter %d at kernel vaddr 0x%x",
+		       ui->unit, frc_address[ui->unit]);
+	}
+	else
+		panic("frc: unknown unit number"); /* shouldn't happen */
+}
+
+int frc_intr()
+{
+	/* we do not expect interrupts */
+	panic("frc_intr");
+}
+
+io_return_t
+frc_openclose(
+	      int dev, 
+	      int flag)
+{
+  if (frc_std[dev])
+    return D_SUCCESS;
+  else
+    return D_NO_SUCH_DEVICE;
+}
+
+vm_offset_t
+frc_mmap(
+	int		dev,
+	vm_offset_t	off,
+	vm_prot_t	prot)
+{
+  	vm_offset_t addr;
+	if ((prot & VM_PROT_WRITE) || (off >= PAGE_SIZE) )
+		return (-1);
+	addr = (vm_offset_t) frc_std[dev] + frc_offset[dev];
+	return btop(pmap_extract(pmap_kernel(), addr));
+}
+
+#endif