Mark Nutter | 05b8411 | 2005-11-15 15:53:51 -0500 | [diff] [blame] | 1 | /* |
| 2 | * utils.h: Utilities for SPU-side of the context switch operation. |
| 3 | * |
| 4 | * (C) Copyright IBM 2005 |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2, or (at your option) |
| 9 | * any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 19 | */ |
| 20 | |
| 21 | #ifndef _SPU_CONTEXT_UTILS_H_ |
| 22 | #define _SPU_CONTEXT_UTILS_H_ |
| 23 | |
| 24 | /* |
| 25 | * 64-bit safe EA. |
| 26 | */ |
| 27 | typedef union { |
| 28 | unsigned long long ull; |
| 29 | unsigned int ui[2]; |
| 30 | } addr64; |
| 31 | |
| 32 | /* |
| 33 | * 128-bit register template. |
| 34 | */ |
| 35 | typedef union { |
| 36 | unsigned int slot[4]; |
| 37 | vector unsigned int v; |
| 38 | } spu_reg128v; |
| 39 | |
| 40 | /* |
| 41 | * DMA list structure. |
| 42 | */ |
| 43 | struct dma_list_elem { |
| 44 | unsigned int size; |
| 45 | unsigned int ea_low; |
| 46 | }; |
| 47 | |
| 48 | /* |
| 49 | * Declare storage for 8-byte aligned DMA list. |
| 50 | */ |
| 51 | struct dma_list_elem dma_list[15] __attribute__ ((aligned(8))); |
| 52 | |
| 53 | /* |
| 54 | * External definition for storage |
| 55 | * declared in crt0. |
| 56 | */ |
| 57 | extern spu_reg128v regs_spill[NR_SPU_SPILL_REGS]; |
| 58 | |
| 59 | /* |
| 60 | * Compute LSCSA byte offset for a given field. |
| 61 | */ |
| 62 | static struct spu_lscsa *dummy = (struct spu_lscsa *)0; |
| 63 | #define LSCSA_BYTE_OFFSET(_field) \ |
| 64 | ((char *)(&(dummy->_field)) - (char *)(&(dummy->gprs[0].slot[0]))) |
| 65 | #define LSCSA_QW_OFFSET(_field) (LSCSA_BYTE_OFFSET(_field) >> 4) |
| 66 | |
| 67 | static inline void set_event_mask(void) |
| 68 | { |
| 69 | unsigned int event_mask = 0; |
| 70 | |
| 71 | /* Save, Step 4: |
| 72 | * Restore, Step 1: |
| 73 | * Set the SPU_RdEventMsk channel to zero to mask |
| 74 | * all events. |
| 75 | */ |
| 76 | spu_writech(SPU_WrEventMask, event_mask); |
| 77 | } |
| 78 | |
| 79 | static inline void set_tag_mask(void) |
| 80 | { |
| 81 | unsigned int tag_mask = 1; |
| 82 | |
| 83 | /* Save, Step 5: |
| 84 | * Restore, Step 2: |
| 85 | * Set the SPU_WrTagMsk channel to '01' to unmask |
| 86 | * only tag group 0. |
| 87 | */ |
| 88 | spu_writech(MFC_WrTagMask, tag_mask); |
| 89 | } |
| 90 | |
| 91 | static inline void build_dma_list(addr64 lscsa_ea) |
| 92 | { |
| 93 | unsigned int ea_low; |
| 94 | int i; |
| 95 | |
| 96 | /* Save, Step 6: |
| 97 | * Restore, Step 3: |
| 98 | * Update the effective address for the CSA in the |
| 99 | * pre-canned DMA-list in local storage. |
| 100 | */ |
| 101 | ea_low = lscsa_ea.ui[1]; |
| 102 | ea_low += LSCSA_BYTE_OFFSET(ls[16384]); |
| 103 | |
| 104 | for (i = 0; i < 15; i++, ea_low += 16384) { |
| 105 | dma_list[i].size = 16384; |
| 106 | dma_list[i].ea_low = ea_low; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | static inline void enqueue_putllc(addr64 lscsa_ea) |
| 111 | { |
| 112 | unsigned int ls = 0; |
| 113 | unsigned int size = 128; |
| 114 | unsigned int tag_id = 0; |
| 115 | unsigned int cmd = 0xB4; /* PUTLLC */ |
| 116 | |
| 117 | /* Save, Step 12: |
| 118 | * Restore, Step 7: |
| 119 | * Send a PUTLLC (tag 0) command to the MFC using |
| 120 | * an effective address in the CSA in order to |
| 121 | * remove any possible lock-line reservation. |
| 122 | */ |
| 123 | spu_writech(MFC_LSA, ls); |
| 124 | spu_writech(MFC_EAH, lscsa_ea.ui[0]); |
| 125 | spu_writech(MFC_EAL, lscsa_ea.ui[1]); |
| 126 | spu_writech(MFC_Size, size); |
| 127 | spu_writech(MFC_TagID, tag_id); |
| 128 | spu_writech(MFC_Cmd, cmd); |
| 129 | } |
| 130 | |
| 131 | static inline void set_tag_update(void) |
| 132 | { |
| 133 | unsigned int update_any = 1; |
| 134 | |
| 135 | /* Save, Step 15: |
| 136 | * Restore, Step 8: |
| 137 | * Write the MFC_TagUpdate channel with '01'. |
| 138 | */ |
| 139 | spu_writech(MFC_WrTagUpdate, update_any); |
| 140 | } |
| 141 | |
| 142 | static inline void read_tag_status(void) |
| 143 | { |
| 144 | /* Save, Step 16: |
| 145 | * Restore, Step 9: |
| 146 | * Read the MFC_TagStat channel data. |
| 147 | */ |
| 148 | spu_readch(MFC_RdTagStat); |
| 149 | } |
| 150 | |
| 151 | static inline void read_llar_status(void) |
| 152 | { |
| 153 | /* Save, Step 17: |
| 154 | * Restore, Step 10: |
| 155 | * Read the MFC_AtomicStat channel data. |
| 156 | */ |
| 157 | spu_readch(MFC_RdAtomicStat); |
| 158 | } |
| 159 | |
| 160 | #endif /* _SPU_CONTEXT_UTILS_H_ */ |