[MIPS] Reimplement clear_page/copy_page

Fold the SB-1 specific implementation of clear_page/copy_page in the
generic version, and rewrite that one in tlbex style. The immediate
benefits:
  - It converts the compile-time workaround for SB-1 pass 1 prefetches
    to a more efficient run-time check.
  - It allows adjustment of loop unfolling, which helps to reduce the
    number of redundant cdex cache ops.
  - It fixes some esoteric cornercases (the cache line length calculations
    can go wrong, and support for 64k pages without prefetch instructions
    will overflow the addiu immediate).
  - Somewhat better guesses of "good" prefetch values.

Signed-off-by: Thiemo Seufer <ths@networkno.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 19 insertions, 7 deletions

diff --git a/arch/mips/mm/uasm.c b/arch/mips/mm/uasm.c
index 1a6f7704cc89..1655aa69e133 100644
--- a/arch/mips/mm/uasm.c
+++ b/arch/mips/mm/uasm.c
@@ -58,13 +58,13 @@ enum opcode {
         insn_invalid,
         insn_addu, insn_addiu, insn_and, insn_andi, insn_beq,
         insn_beql, insn_bgez, insn_bgezl, insn_bltz, insn_bltzl,
-        insn_bne, insn_daddu, insn_daddiu, insn_dmfc0, insn_dmtc0,
-        insn_dsll, insn_dsll32, insn_dsra, insn_dsrl, insn_dsrl32,
-        insn_dsubu, insn_eret, insn_j, insn_jal, insn_jr, insn_ld,
-        insn_ll, insn_lld, insn_lui, insn_lw, insn_mfc0, insn_mtc0,
-        insn_ori, insn_rfe, insn_sc, insn_scd, insn_sd, insn_sll,
-        insn_sra, insn_srl, insn_subu, insn_sw, insn_tlbp, insn_tlbwi,
-        insn_tlbwr, insn_xor, insn_xori
+        insn_bne, insn_cache, insn_daddu, insn_daddiu, insn_dmfc0,
+        insn_dmtc0, insn_dsll, insn_dsll32, insn_dsra, insn_dsrl,
+        insn_dsrl32, insn_dsubu, insn_eret, insn_j, insn_jal, insn_jr,
+        insn_ld, insn_ll, insn_lld, insn_lui, insn_lw, insn_mfc0,
+        insn_mtc0, insn_ori, insn_pref, insn_rfe, insn_sc, insn_scd,
+        insn_sd, insn_sll, insn_sra, insn_srl, insn_subu, insn_sw,
+        insn_tlbp, insn_tlbwi, insn_tlbwr, insn_xor, insn_xori
 };
 
 struct insn {
@@ -94,6 +94,7 @@ static struct insn insn_table[] __cpuinitdata = {
         { insn_bltz, M(bcond_op, 0, bltz_op, 0, 0, 0), RS | BIMM },
         { insn_bltzl, M(bcond_op, 0, bltzl_op, 0, 0, 0), RS | BIMM },
         { insn_bne, M(bne_op, 0, 0, 0, 0, 0), RS | RT | BIMM },
+        { insn_cache,  M(cache_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
         { insn_daddiu, M(daddiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM },
         { insn_daddu, M(spec_op, 0, 0, 0, 0, daddu_op), RS | RT | RD },
         { insn_dmfc0, M(cop0_op, dmfc_op, 0, 0, 0, 0), RT | RD | SET},
@@ -116,6 +117,7 @@ static struct insn insn_table[] __cpuinitdata = {
         { insn_mfc0,  M(cop0_op, mfc_op, 0, 0, 0, 0),  RT | RD | SET},
         { insn_mtc0,  M(cop0_op, mtc_op, 0, 0, 0, 0),  RT | RD | SET},
         { insn_ori,  M(ori_op, 0, 0, 0, 0, 0),  RS | RT | UIMM },
+        { insn_pref,  M(pref_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
         { insn_rfe,  M(cop0_op, cop_op, 0, 0, 0, rfe_op),  0 },
         { insn_sc,  M(sc_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
         { insn_scd,  M(scd_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
@@ -337,6 +339,7 @@ I_u1s2(_bgezl)
 I_u1s2(_bltz)
 I_u1s2(_bltzl)
 I_u1u2s3(_bne)
+I_u2s3u1(_cache)
 I_u1u2u3(_dmfc0)
 I_u1u2u3(_dmtc0)
 I_u2u1s3(_daddiu)
@@ -359,6 +362,7 @@ I_u2s3u1(_lw)
 I_u1u2u3(_mfc0)
 I_u1u2u3(_mtc0)
 I_u2u1u3(_ori)
+I_u2s3u1(_pref)
 I_0(_rfe)
 I_u2s3u1(_sc)
 I_u2s3u1(_scd)
@@ -555,6 +559,14 @@ uasm_il_beqzl(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
 }
 
 void __cpuinit
+uasm_il_bne(u32 **p, struct uasm_reloc **r, unsigned int reg1,
+        unsigned int reg2, int lid)
+{
+        uasm_r_mips_pc16(r, *p, lid);
+        uasm_i_bne(p, reg1, reg2, 0);
+}
+
+void __cpuinit
 uasm_il_bnez(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
 {
         uasm_r_mips_pc16(r, *p, lid);