src/lib/primitive_memtest.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <stdint.h>
   4 #include <lib.h>
   5 #include <console/console.h>
   6
   7 int primitive_memtest(uintptr_t base, uintptr_t size)
   8 {
   9         uintptr_t *p;
  10         uintptr_t i;
  11         int bad = 0;
  12
  13         printk(BIOS_SPEW, "Performing primitive memory test.\n");
  14         printk(BIOS_SPEW, "DRAM start: 0x%08x, DRAM size: 0x%08x", base, size);
  15         for (i = base; i < base + (size - 1) - sizeof(p); i += sizeof(p)) {
  16                 if (i % 0x100000 == 0) {
  17                         if ((i % 0x800000) == 0)
  18                                 printk(BIOS_SPEW, "\n");
  19                         else if (i != 0)
  20                                 printk(BIOS_SPEW, " ");
  21                         printk(BIOS_SPEW, "0x%08x", i);
  22                 }
  23                 p = (uintptr_t *)i;
  24                 *p = i;
  25         }
  26
  27         printk(BIOS_SPEW, "\n\nReading back DRAM content");
  28         for (i = base; i < base + (size - 1) - sizeof(p); i += sizeof(p)) {
  29                 if (i % 0x100000 == 0) {
  30                         if ((i % 0x800000) == 0)
  31                                 printk(BIOS_SPEW, "\n");
  32                         else if (i != 0)
  33                                 printk(BIOS_SPEW, " ");
  34                         printk(BIOS_SPEW, "0x%08x", i);
  35                 }
  36
  37                 p = (uintptr_t *)i;
  38                 if (*p != i) {
  39                         printk(BIOS_SPEW, "\n0x%08zx: got 0x%zx\n", i, *p);
  40                         bad++;
  41                 }
  42         }
  43
  44         printk(BIOS_SPEW, "\n");
  45         printk(BIOS_SPEW, "%d errors\n", bad);
  46
  47         return bad;
  48 }