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147 lines
3.0 KiB
147 lines
3.0 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* utils.h: Utilities for SPU-side of the context switch operation. |
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* |
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* (C) Copyright IBM 2005 |
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*/ |
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#ifndef _SPU_CONTEXT_UTILS_H_ |
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#define _SPU_CONTEXT_UTILS_H_ |
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/* |
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* 64-bit safe EA. |
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*/ |
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typedef union { |
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unsigned long long ull; |
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unsigned int ui[2]; |
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} addr64; |
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/* |
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* 128-bit register template. |
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*/ |
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typedef union { |
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unsigned int slot[4]; |
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vector unsigned int v; |
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} spu_reg128v; |
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/* |
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* DMA list structure. |
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*/ |
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struct dma_list_elem { |
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unsigned int size; |
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unsigned int ea_low; |
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}; |
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/* |
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* Declare storage for 8-byte aligned DMA list. |
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*/ |
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struct dma_list_elem dma_list[15] __attribute__ ((aligned(8))); |
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/* |
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* External definition for storage |
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* declared in crt0. |
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*/ |
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extern spu_reg128v regs_spill[NR_SPU_SPILL_REGS]; |
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/* |
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* Compute LSCSA byte offset for a given field. |
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*/ |
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static struct spu_lscsa *dummy = (struct spu_lscsa *)0; |
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#define LSCSA_BYTE_OFFSET(_field) \ |
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((char *)(&(dummy->_field)) - (char *)(&(dummy->gprs[0].slot[0]))) |
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#define LSCSA_QW_OFFSET(_field) (LSCSA_BYTE_OFFSET(_field) >> 4) |
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static inline void set_event_mask(void) |
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{ |
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unsigned int event_mask = 0; |
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/* Save, Step 4: |
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* Restore, Step 1: |
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* Set the SPU_RdEventMsk channel to zero to mask |
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* all events. |
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*/ |
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spu_writech(SPU_WrEventMask, event_mask); |
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} |
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static inline void set_tag_mask(void) |
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{ |
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unsigned int tag_mask = 1; |
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/* Save, Step 5: |
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* Restore, Step 2: |
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* Set the SPU_WrTagMsk channel to '01' to unmask |
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* only tag group 0. |
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*/ |
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spu_writech(MFC_WrTagMask, tag_mask); |
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} |
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static inline void build_dma_list(addr64 lscsa_ea) |
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{ |
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unsigned int ea_low; |
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int i; |
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/* Save, Step 6: |
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* Restore, Step 3: |
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* Update the effective address for the CSA in the |
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* pre-canned DMA-list in local storage. |
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*/ |
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ea_low = lscsa_ea.ui[1]; |
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ea_low += LSCSA_BYTE_OFFSET(ls[16384]); |
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for (i = 0; i < 15; i++, ea_low += 16384) { |
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dma_list[i].size = 16384; |
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dma_list[i].ea_low = ea_low; |
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} |
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} |
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static inline void enqueue_putllc(addr64 lscsa_ea) |
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{ |
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unsigned int ls = 0; |
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unsigned int size = 128; |
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unsigned int tag_id = 0; |
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unsigned int cmd = 0xB4; /* PUTLLC */ |
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/* Save, Step 12: |
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* Restore, Step 7: |
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* Send a PUTLLC (tag 0) command to the MFC using |
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* an effective address in the CSA in order to |
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* remove any possible lock-line reservation. |
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*/ |
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spu_writech(MFC_LSA, ls); |
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spu_writech(MFC_EAH, lscsa_ea.ui[0]); |
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spu_writech(MFC_EAL, lscsa_ea.ui[1]); |
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spu_writech(MFC_Size, size); |
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spu_writech(MFC_TagID, tag_id); |
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spu_writech(MFC_Cmd, cmd); |
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} |
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static inline void set_tag_update(void) |
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{ |
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unsigned int update_any = 1; |
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/* Save, Step 15: |
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* Restore, Step 8: |
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* Write the MFC_TagUpdate channel with '01'. |
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*/ |
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spu_writech(MFC_WrTagUpdate, update_any); |
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} |
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static inline void read_tag_status(void) |
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{ |
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/* Save, Step 16: |
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* Restore, Step 9: |
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* Read the MFC_TagStat channel data. |
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*/ |
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spu_readch(MFC_RdTagStat); |
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} |
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static inline void read_llar_status(void) |
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{ |
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/* Save, Step 17: |
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* Restore, Step 10: |
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* Read the MFC_AtomicStat channel data. |
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*/ |
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spu_readch(MFC_RdAtomicStat); |
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} |
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#endif /* _SPU_CONTEXT_UTILS_H_ */
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