diff options
| author | Stuart Menefy <stuart.menefy@st.com> | 2007-11-30 18:05:18 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2008-01-28 13:18:59 +0900 |
| commit | fc55888f83c1c0ac09abe4680f9a94fc0662677f (patch) | |
| tree | de8a32166ac3fa5e0a52f43fd080cec53341e547 | |
| parent | 2adb4e10092ee1719539bcfe397b96dbdc863e2e (diff) | |
sh: Document PTEL 31:29 use on PTEA-wielding parts.
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
| -rw-r--r-- | include/asm-sh/pgtable_32.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/asm-sh/pgtable_32.h b/include/asm-sh/pgtable_32.h index 7efc95404c6..3e3557c53c5 100644 --- a/include/asm-sh/pgtable_32.h +++ b/include/asm-sh/pgtable_32.h @@ -22,8 +22,9 @@ * - Bits 10 and 11 are low bits of the PPN that are reserved on >= 4K pages. * Bit 10 is used for _PAGE_ACCESSED, bit 11 remains unused. * - * - Bits 31, 30, and 29 remain unused by everyone and can be used for future - * software flags, although care must be taken to update _PAGE_CLEAR_FLAGS. + * - On 29 bit platforms, bits 31 to 29 are used for the space attributes + * and timing control which (together with bit 0) are moved into the + * old-style PTEA on the parts that support it. * * XXX: Leave the _PAGE_FILE and _PAGE_WT overhaul for a rainy day. * |