rtems/rtems-libbsd
1
0
Fork 0
mirror of https://git.rtems.org/rtems-libbsd/ synced 2025-05-31 19:13:21 +08:00
Code Issues Packages Projects Releases Wiki Activity

rtemsbsd: Clear bus DMA memory a byte at a time

Browse Source 
- memset may be optimized for performance and might work
  with device type memory. Clear a byte at a time.
This commit is contained in:
Chris Johns 2021-10-20 13:42:22 +11:00
parent 38f3de6469
commit f94a67a68d
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
rtemsbsd/rtems/rtems-kernel-bus-dma.c
View File

@ -9,7 +9,7 @@
*/
/*
* Copyright (c) 2009-2012 embedded brains GmbH.
* Copyright (c) 2009-2012 embedded brains GmbH.
* All rights reserved.
*
* embedded brains GmbH
@ -258,7 +258,12 @@ bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
(*mapp)->buffer_size = dmat->maxsize;
if ((flags & BUS_DMA_ZERO) != 0) {
memset(*vaddr, 0, dmat->maxsize);
unsigned char* mem = *vaddr;
int len = dmat->maxsize;
while (len-- > 0) {
bsp_bus_space_write_1(mem, 0);
mem++;
}
}
return (0);