summaryrefslogtreecommitdiff
path: root/include/nios.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/nios.h')
-rw-r--r--include/nios.h77
1 files changed, 77 insertions, 0 deletions
diff --git a/include/nios.h b/include/nios.h
new file mode 100644
index 0000000..46b685a
--- /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__ */