Commit
c5b367835cfc ("MIPS: Add support for XPA.") added generation of a
shift by _PAGE_PRESENT_SHIFT in build_pte_present() and
build_pte_writable(), however except for the XPA case this is always
zero making it unnecessary.
Make the shift conditional upon _PAGE_PRESENT_SHIFT being non-zero to
save an instruction in those cases.
Fixes:
c5b367835cfc ("MIPS: Add support for XPA.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9889/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
int pte, int ptr, int scratch, enum label_id lid)
{
int t = scratch >= 0 ? scratch : pte;
int pte, int ptr, int scratch, enum label_id lid)
{
int t = scratch >= 0 ? scratch : pte;
if (cpu_has_rixi) {
if (use_bbit_insns()) {
uasm_il_bbit0(p, r, pte, ilog2(_PAGE_PRESENT), lid);
uasm_i_nop(p);
} else {
if (cpu_has_rixi) {
if (use_bbit_insns()) {
uasm_il_bbit0(p, r, pte, ilog2(_PAGE_PRESENT), lid);
uasm_i_nop(p);
} else {
- uasm_i_srl(p, t, pte, _PAGE_PRESENT_SHIFT);
- uasm_i_andi(p, t, t, 1);
+ if (_PAGE_PRESENT_SHIFT) {
+ uasm_i_srl(p, t, cur, _PAGE_PRESENT_SHIFT);
+ cur = t;
+ }
+ uasm_i_andi(p, t, cur, 1);
uasm_il_beqz(p, r, t, lid);
if (pte == t)
/* You lose the SMP race :-(*/
iPTE_LW(p, pte, ptr);
}
} else {
uasm_il_beqz(p, r, t, lid);
if (pte == t)
/* You lose the SMP race :-(*/
iPTE_LW(p, pte, ptr);
}
} else {
- uasm_i_srl(p, t, pte, _PAGE_PRESENT_SHIFT);
- uasm_i_andi(p, t, t,
+ if (_PAGE_PRESENT_SHIFT) {
+ uasm_i_srl(p, t, cur, _PAGE_PRESENT_SHIFT);
+ cur = t;
+ }
+ uasm_i_andi(p, t, cur,
(_PAGE_PRESENT | _PAGE_READ) >> _PAGE_PRESENT_SHIFT);
uasm_i_xori(p, t, t,
(_PAGE_PRESENT | _PAGE_READ) >> _PAGE_PRESENT_SHIFT);
(_PAGE_PRESENT | _PAGE_READ) >> _PAGE_PRESENT_SHIFT);
uasm_i_xori(p, t, t,
(_PAGE_PRESENT | _PAGE_READ) >> _PAGE_PRESENT_SHIFT);
enum label_id lid)
{
int t = scratch >= 0 ? scratch : pte;
enum label_id lid)
{
int t = scratch >= 0 ? scratch : pte;
- uasm_i_srl(p, t, pte, _PAGE_PRESENT_SHIFT);
- uasm_i_andi(p, t, t,
+ if (_PAGE_PRESENT_SHIFT) {
+ uasm_i_srl(p, t, cur, _PAGE_PRESENT_SHIFT);
+ cur = t;
+ }
+ uasm_i_andi(p, t, cur,
(_PAGE_PRESENT | _PAGE_WRITE) >> _PAGE_PRESENT_SHIFT);
uasm_i_xori(p, t, t,
(_PAGE_PRESENT | _PAGE_WRITE) >> _PAGE_PRESENT_SHIFT);
(_PAGE_PRESENT | _PAGE_WRITE) >> _PAGE_PRESENT_SHIFT);
uasm_i_xori(p, t, t,
(_PAGE_PRESENT | _PAGE_WRITE) >> _PAGE_PRESENT_SHIFT);