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/* Generate an assembly file with set-up code to place before the linked
simd text section.
This will kick of a DMA copy of initialized data (read-only and
ordinary initialized data are supposed to be concatenated) from main
memory to SDM, and then start recording to SCM.
Command line parameters:
1: transfer source address in main memory.
2: transfer destination address in SDM
3: transfer size
4: SCM recording start address */
#include <stdio.h>
#include <stdlib.h>
int
main (int argc, char **argv)
{
int sdm_start, size;
char *main_start;
int i;
int stride, lines;
if (argc < 4)
exit (1);
main_start = argv[1];
sdm_start = strtol (argv[2], NULL, 0);
size = strtol (argv[3], NULL, 0);
/* Setting up multiple transfers is expensive, so prefer to transfer a
little bit more instead. The worst this will do for sizes up to
37 KB is to transfer 10 extra 32-bit words. */
i = (size + 3) >> 2;
{
int x_start = (i > 63 ? 63 : i);
int x_end = (i <= 255 ? 1 : (i+254)/255);
int x;
int min = i;
int min_x = 0, min_y = 0;
for (x = x_start, min = i; x >= x_end; x--)
{
int y = (i + x - 1) / x;
int r;
if (y > 255)
y = 255;
r = x * y - i;
if (r < 0)
abort ();
if (min > r)
{
min = r;
min_x = x;
min_y = y;
}
if (r == 0)
break;
}
#if 0
printf ("%d %d %d %d\n", i, min_x, min_y, min);
#endif
stride = min_x * 4;
lines = min_y;
}
if (size == lines * stride)
printf ("; Copying 0x%x bytes.\n", size);
else
printf ("; Need to copy 0x%x bytes, copying 0x%x instead.\n",
size, lines * stride);
printf ("\tvdiwr dr0,0x%x; SDM start\n", sdm_start);
printf ("\tmov_s r12,%d\n", stride);
printf ("\tvdiwr dr1,r12; SDM stride\n");
printf ("\tvdiwr dr2,0x1f%02x%02x; copy %d lines of %d bytes\n",
lines, stride, lines, stride);
printf ("\tvdiwr dr4,%s; main memory start\n", main_start);
printf ("\tvdiwr dr5,r12; main memory stride\n");
printf ("\tvdirun pcl,pcl; start dma transfer\n");
exit (0);
}
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