spu_utils.h
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/*
* utils.h: Utilities for SPU-side of the context switch operation.
*
* (C) Copyright IBM 2005
*
* 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#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 = 0xB4; /* 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_ */