arch/powerpc/platforms/cell/spufs/spu_utils.h

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/cell/spufs/spu_utils.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/cell/spufs/spu_utils.h
Extension
.h
Size
3069 bytes
Lines
148
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

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)
{

Annotation

Implementation Notes