Fix 64bit SMP TLB handler and stack frame handling, optimize 32bit SMP

TLB handlers a bit, match definitions in pgtable-{32,64}.h better.

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

2 files changed, 22 insertions, 29 deletions

diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S
index 124c27e908f..9f692716935 100644
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -157,6 +157,7 @@ NESTED(kernel_entry, 16, sp)			# kernel entry point
 	LONG_S		a2, fw_arg2
 	LONG_S		a3, fw_arg3
 
+	MTC0		zero, CP0_CONTEXT	# clear context register
 	PTR_LA		$28, init_thread_union
 	PTR_ADDIU	sp, $28, _THREAD_SIZE - 32
 	set_saved_sp	sp, t0, t1
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index bcf87a2b554..018f7527a72 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -91,7 +91,7 @@ enum opcode {
 	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_dsll, insn_dsll32, insn_dsra, insn_dsrl,
 	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,
@@ -134,7 +134,6 @@ static __initdata struct insn insn_table[] = {
 	{ insn_dsll32, M(spec_op,0,0,0,0,dsll32_op), RT | RD | RE },
 	{ insn_dsra, M(spec_op,0,0,0,0,dsra_op), RT | RD | RE },
 	{ insn_dsrl, M(spec_op,0,0,0,0,dsrl_op), RT | RD | RE },
-	{ insn_dsrl32, M(spec_op,0,0,0,0,dsrl32_op), RT | RD | RE },
 	{ insn_dsubu, M(spec_op,0,0,0,0,dsubu_op), RS | RT | RD },
 	{ insn_eret, M(cop0_op,cop_op,0,0,0,eret_op), 0 },
 	{ insn_j, M(j_op,0,0,0,0,0), JIMM },
@@ -366,7 +365,6 @@ I_u2u1u3(_dsll);
 I_u2u1u3(_dsll32);
 I_u2u1u3(_dsra);
 I_u2u1u3(_dsrl);
-I_u2u1u3(_dsrl32);
 I_u3u1u2(_dsubu);
 I_0(_eret);
 I_u1(_j);
@@ -944,34 +942,29 @@ build_get_pmde64(u32 **p, struct label **l, struct reloc **r,
 	/* No i_nop needed here, since the next insn doesn't touch TMP. */
 
 #ifdef CONFIG_SMP
+# ifdef CONFIG_BUILD_ELF64
 	/*
-	 * 64 bit SMP has the lower part of &pgd_current[smp_processor_id()]
+	 * 64 bit SMP running in XKPHYS has smp_processor_id() << 3
 	 * stored in CONTEXT.
 	 */
-	if (in_compat_space_p(pgdc)) {
-		i_dmfc0(p, ptr, C0_CONTEXT);
-		i_dsra(p, ptr, ptr, 23);
-		i_ld(p, ptr, 0, ptr);
-	} else {
-#ifdef CONFIG_BUILD_ELF64
-		i_dmfc0(p, ptr, C0_CONTEXT);
-		i_dsrl(p, ptr, ptr, 23);
-		i_dsll(p, ptr, ptr, 3);
-		i_LA_mostly(p, tmp, pgdc);
-		i_daddu(p, ptr, ptr, tmp);
-		i_dmfc0(p, tmp, C0_BADVADDR);
-		i_ld(p, ptr, rel_lo(pgdc), ptr);
-#else
-		i_dmfc0(p, ptr, C0_CONTEXT);
-		i_lui(p, tmp, rel_highest(pgdc));
-		i_dsll(p, ptr, ptr, 9);
-		i_daddiu(p, tmp, tmp, rel_higher(pgdc));
-		i_dsrl32(p, ptr, ptr, 0);
-		i_and(p, ptr, ptr, tmp);
-		i_dmfc0(p, tmp, C0_BADVADDR);
-		i_ld(p, ptr, 0, ptr);
-#endif
-	}
+	i_dmfc0(p, ptr, C0_CONTEXT);
+	i_dsrl(p, ptr, ptr, 23);
+	i_LA_mostly(p, tmp, pgdc);
+	i_daddu(p, ptr, ptr, tmp);
+	i_dmfc0(p, tmp, C0_BADVADDR);
+	i_ld(p, ptr, rel_lo(pgdc), ptr);
+# else
+	/*
+	 * 64 bit SMP running in compat space has the lower part of
+	 * &pgd_current[smp_processor_id()] stored in CONTEXT.
+	 */
+	if (!in_compat_space_p(pgdc))
+		panic("Invalid page directory address!");
+
+	i_dmfc0(p, ptr, C0_CONTEXT);
+	i_dsra(p, ptr, ptr, 23);
+	i_ld(p, ptr, 0, ptr);
+# endif
 #else
 	i_LA_mostly(p, ptr, pgdc);
 	i_ld(p, ptr, rel_lo(pgdc), ptr);
@@ -1028,7 +1021,6 @@ build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr)
 	i_mfc0(p, ptr, C0_CONTEXT);
 	i_LA_mostly(p, tmp, pgdc);
 	i_srl(p, ptr, ptr, 23);
-	i_sll(p, ptr, ptr, 2);
 	i_addu(p, ptr, tmp, ptr);
 #else
 	i_LA_mostly(p, ptr, pgdc);