summaryrefslogtreecommitdiffstats
path: root/Documentation/x86
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/x86')
-rw-r--r--Documentation/x86/pat.txt10
1 files changed, 5 insertions, 5 deletions
diff --git a/Documentation/x86/pat.txt b/Documentation/x86/pat.txt
index 1784ff2..cf08c9f 100644
--- a/Documentation/x86/pat.txt
+++ b/Documentation/x86/pat.txt
@@ -82,23 +82,23 @@ pci proc | -- | -- | WC |
Advanced APIs for drivers
-------------------------
-A. Exporting pages to user with remap_pfn_range, io_remap_pfn_range,
+A. Exporting pages to users with remap_pfn_range, io_remap_pfn_range,
vm_insert_pfn
-Drivers wanting to export some pages to userspace, do it by using mmap
+Drivers wanting to export some pages to userspace do it by using mmap
interface and a combination of
1) pgprot_noncached()
2) io_remap_pfn_range() or remap_pfn_range() or vm_insert_pfn()
-With pat support, a new API pgprot_writecombine is being added. So, driver can
+With PAT support, a new API pgprot_writecombine is being added. So, drivers can
continue to use the above sequence, with either pgprot_noncached() or
pgprot_writecombine() in step 1, followed by step 2.
In addition, step 2 internally tracks the region as UC or WC in memtype
list in order to ensure no conflicting mapping.
-Note that this set of APIs only work with IO (non RAM) regions. If driver
-wants to export RAM region, it has to do set_memory_uc() or set_memory_wc()
+Note that this set of APIs only works with IO (non RAM) regions. If driver
+wants to export a RAM region, it has to do set_memory_uc() or set_memory_wc()
as step 0 above and also track the usage of those pages and use set_memory_wb()
before the page is freed to free pool.
OpenPOWER on IntegriCloud