nvidia/engine/nv_acc_dma.c

962 	 * This define tells the engine where the DMA cmd buffer is and what it's size is.
963 	 * Inside that cmd buffer you'll find the actual issued engine commands. */
1049 	/*** init DMA command buffer info ***/
1055 	LOG(4, ("ACC_DMA: command buffer is at adress $%p\n", si->dma_buffer));
1058 	/* the current first free adress in the DMA buffer is at offset 0 */
1060 	/* the DMA buffer can hold 8k 32-bit words (it's 32kb in size),
1063 	 * one word is reserved at the end of the DMA buffer to be able to instruct the
1064 	 * engine to do a buffer wrap-around!
1070 	/* note the current free space we have left in the DMA buffer */
1073 	/*** init FIFO via DMA command buffer. ***/
1163 	/* tell the engine to fetch and execute all (new) commands in the DMA buffer */
1407 		/* Z-buffer state is:
1408 		 * initialized, set to: 'fixed point' (integer?); Z-buffer; 16bits depth */
1410 		 * other options possible are: floating point; 24bits depth; W-buffer */
1424 		/* flush used caches so we know for sure the DMA cmd buffer received all data. */
1438 		/* actually start DMA to execute all commands now in buffer */
1450  * command buffer. You can see this as a FIFO as well, that feeds the hardware FIFO.
1460 	/* check if the DMA buffer has enough room for the command.
1465 		/* see where the engine is currently fetching from the buffer */
1483 			/* engine is fetching 'behind us', the last piece of the buffer is free */
1485 			/* note the 'updated' free space we have in the DMA buffer */
1490 				/* not enough room left, so instruct DMA engine to reset the buffer
1493 				/* reset our buffer pointer, so new commands will be placed at the
1494 				 * beginning of the buffer. */
1496 				/* tell the engine to fetch the remaining command(s) in the DMA buffer
1501 				 * of the buffer is free */
1503 				/* note the updated current free space we have in the DMA buffer */
1515 				 * with the size of the DMA buffer. */
1524 			/* engine is fetching 'in front of us', so the first piece of the buffer
1527 			/* note the updated current free space we have in the DMA buffer */
1539 			 * with the size of the DMA buffer. */
1569 	 * b'002' is 'noninc method' (execute buffer wrap-around);
1655 		/* tell the engine to fetch and execute all (new) commands in the DMA buffer */
1718 		/* tell the engine to fetch the commands in the DMA buffer that where not
1865 		/* tell the engine to fetch the commands in the DMA buffer that where not
1879 		/* tell the engine to fetch the commands in the DMA buffer that where not
1899 	LOG(4, ("ACC_DMA: offscreen src buffer location $%p\n",
1900 		(uint8*)(config->buffer)));
2015 			(uint32)((uint8*)config->buffer - (uint8*)si->framebuffer +
2047 	/* tell the engine to fetch the commands in the DMA buffer that where not
2060 		/* tell the engine to fetch the commands in the DMA buffer that where not
2112 		/* tell the engine to fetch the commands in the DMA buffer that where not
2163 		/* tell the engine to fetch the commands in the DMA buffer that where not
2215 		/* tell the engine to fetch the commands in the DMA buffer that where not