On 05/10/16 16:49, Conrad Meyer wrote:
On Tue, May 10, 2016 at 5:04 AM, Hans Petter Selasky
<hsela...@freebsd.org> wrote:
Author: hselasky
Date: Tue May 10 12:04:57 2016
New Revision: 299364
URL: https://svnweb.freebsd.org/changeset/base/299364
Log:
Add more LinuxKPI I/O functions.
Obtained from: kmacy @
...
@@ -166,5 +212,35 @@ __iowrite64_copy(void *to, void *from, s
#endif
}
+enum {
+ MEMREMAP_WB = 1 << 0,
+ MEMREMAP_WT = 1 << 1,
+ MEMREMAP_WC = 1 << 2,
+};
+
+static inline void *
+memremap(resource_size_t offset, size_t size, unsigned long flags)
+{
+ void *addr = NULL;
+
+ if ((flags & MEMREMAP_WB) &&
+ (addr = ioremap_wb(offset, size)) != NULL)
+ goto done;
+ if ((flags & MEMREMAP_WT) &&
+ (addr = ioremap_nocache(offset, size)) != NULL)
+ goto done;
x86 can actually map memory as WT rather than UC. Why throw that away?
+ if ((flags & MEMREMAP_WC) &&
+ (addr = ioremap_wc(offset, size)) != NULL)
+ goto done;
+done:
+ return (addr);
+}
+
...
Hi Conrad,
I agree. I see no reason to not implement ioremap_wt() for x86 (32-bit
and 64-bit) and use it for the WT case.
--HPS
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