From 4a5517094dd30bb1f271403b62e23053301668e6 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Wed, 8 Oct 2003 23:26:14 +0000
Subject: * Patch by Scott McNutt, 04 Oct 2003:   - add support for Altera
 Nios-32 CPU   - add support for Nios Cyclone Development Kit (DK-1C20)

* Patch by Steven Scholz, 29 Sep 2003:
  - A second parameter for bootm overwrites the load address for
    "Standalone Application" images.
  - bootm sets environment variable "filesize" to the resulting
    (uncompressed) data length for "Standalone Application" images
    when autostart is set to "no". Now you can do something like
       if bootm $fpgadata $some_free_ram ; then
               fpga load 0 $some_free_ram $filesize
       fi

* Patch by Denis Peter, 25 Sept 2003:
  add support for the MIP405 Rev. C board
---
 include/nios.h | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 include/nios.h

(limited to 'include/nios.h')

diff --git a/include/nios.h b/include/nios.h
new file mode 100644
index 000000000..46b685ab9
--- /dev/null
+++ b/include/nios.h
@@ -0,0 +1,77 @@
+/*
+ * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __NIOS_H__
+#define __NIOS_H__
+
+/*------------------------------------------------------------------------
+ * Control registers -- use with wrctl() & rdctl()
+ *----------------------------------------------------------------------*/
+#define CTL_STATUS	0x00		/* Processor status		*/
+#define CTL_ISTATUS	0x01		/* Saved status (exception)	*/
+#define CTL_WVALID	0x02		/* Valid window limit		*/
+#define CTL_ICACHE	0x05		/* I-cache line-invalidate	*/
+#define CTL_CPU_ID	0x06		/* CPU version id		*/
+#define CTL_DCACHE	0x07		/* D-cache line-invalidate	*/
+#define CTL_CLR_IE	0x08		/* Interrupt clear (disable)	*/
+#define CTL_SET_IE	0x09		/* Interrupt set (enable)	*/
+
+/*------------------------------------------------------------------------
+ * Access to control regs
+ *----------------------------------------------------------------------*/
+#define _str_(s)	#s
+
+#define rdctl(reg)\
+	({unsigned int val;\
+	asm volatile( "pfx " _str_(reg) "\n\t rdctl %0"\
+		: "=r" (val) ); val;})
+
+#define wrctl(reg,val)\
+	asm volatile( "pfx " _str_(reg) "\n\t wrctl %0 \n\t nop"\
+		: : "r" (val))
+
+/*------------------------------------------------------------------------
+ * Control reg bit masks
+ *----------------------------------------------------------------------*/
+#define STATUS_DC	(1<<17)		/* Data cache enable		*/
+#define STATUS_IC	(1<<16)		/* Instruction cache enable	*/
+#define STATUS_IE	(1<<15)		/* Interrupt enable		*/
+#define STATUS_IPRI	(0x3f<<9)	/* Interrupt priority		*/
+#define STATUS_CWP	(0x1f<<4)	/* Current window pointer	*/
+#define STATUS_N	(1<<3)		/* Condition code: negative	*/
+#define STATUS_V	(1<<2)		/* Condition code: overflow	*/
+#define STATUS_Z	(1<<1)		/* Condition code: zero		*/
+#define STATUS_C	(1<<0)		/* Condition code: carry/borrow */
+
+static inline unsigned ipri( unsigned prio )
+{
+	unsigned tmp;
+	unsigned status = rdctl(CTL_STATUS);
+	prio = (prio << 9) & STATUS_IPRI;
+	tmp = (status & ~STATUS_IPRI) | prio;
+	wrctl(CTL_STATUS,tmp);
+	return( (status & STATUS_IPRI) >> 9);
+}
+
+
+#endif /* __NIOS_H__ */
-- 
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