}
}
+static void generate_pattern(void *buffer, size_t len, size_t cycle_len)
+{
+ int i, j;
+ unsigned char *tx = (unsigned char *)buffer;
+ unsigned char p;
+ size_t *sx;
+
+ /* Write an indicative pattern that varies and is unique per-cycle */
+ p = rand() % 256;
+ for (i = j = 0; i < len; i++, j++) {
+ tx[i] = p;
+ if (j % cycle_len == 0) {
+ p = rand() % 256;
+ }
+ }
+
+ /* force uniqueness by writing an id per-cycle */
+ for (i = 0; i < len / cycle_len; i++) {
+ j = i * cycle_len;
+ if (j + sizeof(*sx) <= len) {
+ sx = (size_t *)&tx[j];
+ *sx = i;
+ }
+ }
+}
+
/*** Test Setup & Teardown ***/
/**
{
uint64_t ptr;
uint8_t port;
- unsigned i;
unsigned char *tx = g_malloc(bufsize);
unsigned char *rx = g_malloc0(bufsize);
g_assert(ptr);
/* Write some indicative pattern to our buffer. */
- for (i = 0; i < bufsize; i++) {
- tx[i] = (bufsize - i);
- }
+ generate_pattern(tx, bufsize, AHCI_SECTOR_SIZE);
memwrite(ptr, tx, bufsize);
/* Write this buffer to disk, then read it back to the DMA buffer. */
size_t bufsize = 4096;
unsigned char *tx = g_malloc(bufsize);
unsigned char *rx = g_malloc0(bufsize);
- unsigned i;
uint64_t ptr;
ahci = ahci_boot_and_enable();
ahci_port_clear(ahci, px);
/* create pattern */
- for (i = 0; i < bufsize; i++) {
- tx[i] = (bufsize - i);
- }
+ generate_pattern(tx, bufsize, AHCI_SECTOR_SIZE);
/* Create a DMA buffer in guest memory, and write our pattern to it. */
ptr = guest_alloc(ahci->parent->alloc, bufsize);