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