linux-mips
[Top] [All Lists]

[PATCH v2,04/10] MIPS: Add micro-assembler support for 'ins' and 'ext' i

To: linux-mips@linux-mips.org, ralf@linux-mips.org
Subject: [PATCH v2,04/10] MIPS: Add micro-assembler support for 'ins' and 'ext' instructions.
From: "Steven J. Hill" <sjhill@mips.com>
Date: Thu, 10 May 2012 23:16:06 -0500
Cc: "Steven J. Hill" <sjhill@mips.com>
Sender: linux-mips-bounce@linux-mips.org
From: "Steven J. Hill" <sjhill@mips.com>

Add the MIPS32R2 'ins' and 'ext' instructions for use by the
kernel's micro-assembler.

Signed-off-by: Steven J. Hill <sjhill@mips.com>
---
 arch/mips/include/asm/uasm.h |    2 ++
 arch/mips/mm/tlbex.c         |   17 +++++++++++++++++
 arch/mips/mm/uasm.c          |   13 +++++++++++++
 3 files changed, 32 insertions(+)

diff --git a/arch/mips/include/asm/uasm.h b/arch/mips/include/asm/uasm.h
index 504d40a..814bc9f 100644
--- a/arch/mips/include/asm/uasm.h
+++ b/arch/mips/include/asm/uasm.h
@@ -114,6 +114,8 @@ Ip_0(_tlbwi);
 Ip_0(_tlbwr);
 Ip_u3u1u2(_xor);
 Ip_u2u1u3(_xori);
+Ip_u2u1msbu3(_ext);
+Ip_u2u1msbu3(_ins);
 Ip_u2u1msbu3(_dins);
 Ip_u2u1msbu3(_dinsm);
 Ip_u1(_syscall);
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index 897b727..7b12f27 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -921,6 +921,13 @@ build_get_pgde32(u32 **p, unsigned int tmp, unsigned int 
ptr)
 #endif
        uasm_i_mfc0(p, tmp, C0_BADVADDR); /* get faulting address */
        uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr);
+#ifdef CONFIG_32BIT
+       if (cpu_has_mips32r2) {
+               uasm_i_ext(p, tmp, tmp, PGDIR_SHIFT, (32 - PGDIR_SHIFT));
+               uasm_i_ins(p, ptr, tmp, PGD_T_LOG2, (32 - PGDIR_SHIFT));
+               return;
+       }
+#endif
        uasm_i_srl(p, tmp, tmp, PGDIR_SHIFT); /* get pgd only bits */
        uasm_i_sll(p, tmp, tmp, PGD_T_LOG2);
        uasm_i_addu(p, ptr, ptr, tmp); /* add in pgd offset */
@@ -956,6 +963,16 @@ static void __cpuinit build_adjust_context(u32 **p, 
unsigned int ctx)
 
 static void __cpuinit build_get_ptep(u32 **p, unsigned int tmp, unsigned int 
ptr)
 {
+#ifdef CONFIG_32BIT
+       if (cpu_has_mips32r2) {
+               /* For MIPS32R2, PTE ptr offset is obtained from BadVAddr */
+               UASM_i_MFC0(p, tmp, C0_BADVADDR);
+               UASM_i_LW(p, ptr, 0, ptr);
+               uasm_i_ext(p, tmp, tmp, PAGE_SHIFT+1, PGDIR_SHIFT-PAGE_SHIFT-1);
+               uasm_i_ins(p, ptr, tmp, PTE_T_LOG2+1, PGDIR_SHIFT-PAGE_SHIFT-1);
+               return;
+       }
+#endif
        /*
         * Bug workaround for the Nevada. It seems as if under certain
         * circumstances the move from cp0_context might produce a
diff --git a/arch/mips/mm/uasm.c b/arch/mips/mm/uasm.c
index 5fa1851..d3d0218 100644
--- a/arch/mips/mm/uasm.c
+++ b/arch/mips/mm/uasm.c
@@ -10,6 +10,7 @@
  * Copyright (C) 2004, 2005, 2006, 2008  Thiemo Seufer
  * Copyright (C) 2005, 2007  Maciej W. Rozycki
  * Copyright (C) 2006  Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 2011, 2012  MIPS Technologies, Inc.
  */
 
 #include <linux/kernel.h>
@@ -63,6 +64,7 @@ enum opcode {
        insn_bne, insn_cache, insn_daddu, insn_daddiu, insn_dmfc0,
        insn_dmtc0, insn_dsll, insn_dsll32, insn_dsra, insn_dsrl,
        insn_dsrl32, insn_drotr, insn_drotr32, insn_dsubu, insn_eret,
+       insn_ins, insn_ext,
        insn_j, insn_jal, insn_jr, insn_ld, insn_ll, insn_lld,
        insn_lui, insn_lw, insn_mfc0, insn_mtc0, insn_or, insn_ori,
        insn_pref, insn_rfe, insn_sc, insn_scd, insn_sd, insn_sll,
@@ -113,6 +115,8 @@ static struct insn insn_table[] __uasminitdata = {
        { insn_drotr32, M(spec_op, 1, 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_ins, M(spec3_op, 0, 0, 0, 0, ins_op), RS | RT | RD | RE },
+       { insn_ext, M(spec3_op, 0, 0, 0, 0, ext_op), RS | RT | RD | RE },
        { insn_j,  M(j_op, 0, 0, 0, 0, 0),  JIMM },
        { insn_jal,  M(jal_op, 0, 0, 0, 0, 0),  JIMM },
        { insn_jr,  M(spec_op, 0, 0, 0, 0, jr_op),  RS },
@@ -343,6 +347,13 @@ Ip_u2u1msbu3(op)                                   \
 }                                                      \
 UASM_EXPORT_SYMBOL(uasm_i##op);
 
+#define I_u2u1mmsbu3(op)                               \
+Ip_u2u1msbu3(op)                                       \
+{                                                      \
+       build_insn(buf, insn##op, b, a, d-1, c);        \
+}                                                      \
+UASM_EXPORT_SYMBOL(uasm_i##op);
+
 #define I_u1u2(op)                                     \
 Ip_u1u2(op)                                            \
 {                                                      \
@@ -396,6 +407,8 @@ I_u2u1u3(_drotr)
 I_u2u1u3(_drotr32)
 I_u3u1u2(_dsubu)
 I_0(_eret)
+I_u2u1msbu3(_ins)
+I_u2u1mmsbu3(_ext)
 I_u1(_j)
 I_u1(_jal)
 I_u1(_jr)
-- 
1.7.10


<Prev in Thread] Current Thread [Next in Thread>