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Diffstat (limited to 'include/nios.h')
| -rw-r--r-- | include/nios.h | 77 |
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__ */ |