| wdenk | 4a55170 | 2003-10-08 23:26:14 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * (C) Copyright 2003, Psyent Corporation <www.psyent.com> |
| 3 | * Scott McNutt <smcnutt@psyent.com> |
| 4 | * |
| 5 | * See file CREDITS for list of people who contributed to this |
| 6 | * project. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of |
| 11 | * the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 21 | * MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #ifndef __NIOS_H__ |
| 25 | #define __NIOS_H__ |
| 26 | |
| 27 | /*------------------------------------------------------------------------ |
| 28 | * Control registers -- use with wrctl() & rdctl() |
| 29 | *----------------------------------------------------------------------*/ |
| 30 | #define CTL_STATUS 0x00 /* Processor status */ |
| 31 | #define CTL_ISTATUS 0x01 /* Saved status (exception) */ |
| 32 | #define CTL_WVALID 0x02 /* Valid window limit */ |
| 33 | #define CTL_ICACHE 0x05 /* I-cache line-invalidate */ |
| 34 | #define CTL_CPU_ID 0x06 /* CPU version id */ |
| 35 | #define CTL_DCACHE 0x07 /* D-cache line-invalidate */ |
| 36 | #define CTL_CLR_IE 0x08 /* Interrupt clear (disable) */ |
| 37 | #define CTL_SET_IE 0x09 /* Interrupt set (enable) */ |
| 38 | |
| 39 | /*------------------------------------------------------------------------ |
| 40 | * Access to control regs |
| 41 | *----------------------------------------------------------------------*/ |
| 42 | #define _str_(s) #s |
| 43 | |
| 44 | #define rdctl(reg)\ |
| 45 | ({unsigned int val;\ |
| 46 | asm volatile( "pfx " _str_(reg) "\n\t rdctl %0"\ |
| 47 | : "=r" (val) ); val;}) |
| 48 | |
| 49 | #define wrctl(reg,val)\ |
| 50 | asm volatile( "pfx " _str_(reg) "\n\t wrctl %0 \n\t nop"\ |
| 51 | : : "r" (val)) |
| 52 | |
| 53 | /*------------------------------------------------------------------------ |
| 54 | * Control reg bit masks |
| 55 | *----------------------------------------------------------------------*/ |
| 56 | #define STATUS_DC (1<<17) /* Data cache enable */ |
| 57 | #define STATUS_IC (1<<16) /* Instruction cache enable */ |
| 58 | #define STATUS_IE (1<<15) /* Interrupt enable */ |
| 59 | #define STATUS_IPRI (0x3f<<9) /* Interrupt priority */ |
| 60 | #define STATUS_CWP (0x1f<<4) /* Current window pointer */ |
| 61 | #define STATUS_N (1<<3) /* Condition code: negative */ |
| 62 | #define STATUS_V (1<<2) /* Condition code: overflow */ |
| 63 | #define STATUS_Z (1<<1) /* Condition code: zero */ |
| 64 | #define STATUS_C (1<<0) /* Condition code: carry/borrow */ |
| 65 | |
| 66 | static inline unsigned ipri( unsigned prio ) |
| 67 | { |
| 68 | unsigned tmp; |
| 69 | unsigned status = rdctl(CTL_STATUS); |
| 70 | prio = (prio << 9) & STATUS_IPRI; |
| 71 | tmp = (status & ~STATUS_IPRI) | prio; |
| 72 | wrctl(CTL_STATUS,tmp); |
| 73 | return( (status & STATUS_IPRI) >> 9); |
| 74 | } |
| 75 | |
| 76 | |
| 77 | #endif /* __NIOS_H__ */ |