From fc55888f83c1c0ac09abe4680f9a94fc0662677f Mon Sep 17 00:00:00 2001 From: Stuart Menefy <stuart.menefy@st.com> Date: Fri, 30 Nov 2007 18:05:18 +0900 Subject: [PATCH] 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> --- include/asm-sh/pgtable_32.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/include/asm-sh/pgtable_32.h b/include/asm-sh/pgtable_32.h index 7efc95404c64..3e3557c53c55 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. * -- GitLab