d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Just wbinv if both PREREAD and PREWRITE are set.

Browse Source 
In PREREAD, just invalidate the cache lines, and do not write back them, if
the buffer is properly aligned.

Approved by:	re (blanket)
This commit is contained in:
Olivier Houchard 2007-08-18 16:47:28 +00:00
parent daab56673e
commit d3973c98d5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=171890
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
sys/arm/arm/busdma_machdep.c
View File

@ -1091,13 +1091,19 @@ bus_dmamap_sync_buf(void *buf, int len, bus_dmasync_op_t op)
{
char _tmp_cl[arm_dcache_align], _tmp_clend[arm_dcache_align];
if (op & BUS_DMASYNC_PREWRITE) {
if ((op & BUS_DMASYNC_PREWRITE) && !(op & BUS_DMASYNC_PREREAD)) {
cpu_dcache_wb_range((vm_offset_t)buf, len);
cpu_l2cache_wb_range((vm_offset_t)buf, len);
}
if (op & BUS_DMASYNC_PREREAD) {
cpu_idcache_wbinv_range((vm_offset_t)buf, len);
cpu_l2cache_wbinv_range((vm_offset_t)buf, len);
if ((op & BUS_DMASYNC_PREWRITE) ||
((((vm_offset_t)(buf) | len) & arm_dcache_align_mask) == 0)) {
cpu_dcache_inv_range((vm_offset_t)buf, len);
cpu_l2cache_inv_range((vm_offset_t)buf, len);
} else {
cpu_dcache_wbinv_range((vm_offset_t)buf, len);
cpu_l2cache_wbinv_range((vm_offset_t)buf, len);
}
}
if (op & BUS_DMASYNC_POSTREAD) {
if ((vm_offset_t)buf & arm_dcache_align_mask) {