MIPS: Sibyte: Fix M3 TLB exception handler workaround.

The M3 workaround needs to cmpare the region and VPN2 fields only.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index 0de0e41..d1f68aa 100644 (file)
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -788,10 +788,15 @@ static void __cpuinit build_r4000_tlb_refill_handler(void)
         * create the plain linear handler
         */
        if (bcm1250_m3_war()) {
-               UASM_i_MFC0(&p, K0, C0_BADVADDR);
-               UASM_i_MFC0(&p, K1, C0_ENTRYHI);
+               unsigned int segbits = 44;
+
+               uasm_i_dmfc0(&p, K0, C0_BADVADDR);
+               uasm_i_dmfc0(&p, K1, C0_ENTRYHI);
                uasm_i_xor(&p, K0, K0, K1);
-               UASM_i_SRL(&p, K0, K0, PAGE_SHIFT + 1);
+               uasm_i_dsrl32(&p, K1, K0, 62 - 32);
+               uasm_i_dsrl(&p, K0, K0, 12 + 1);
+               uasm_i_dsll32(&p, K0, K0, 64 + 12 + 1 - segbits - 32);
+               uasm_i_or(&p, K0, K0, K1);
                uasm_il_bnez(&p, &r, K0, label_leave);
                /* No need for uasm_i_nop */
        }
@@ -1312,10 +1317,15 @@ static void __cpuinit build_r4000_tlb_load_handler(void)
        memset(relocs, 0, sizeof(relocs));
 
        if (bcm1250_m3_war()) {
-               UASM_i_MFC0(&p, K0, C0_BADVADDR);
-               UASM_i_MFC0(&p, K1, C0_ENTRYHI);
+               unsigned int segbits = 44;
+
+               uasm_i_dmfc0(&p, K0, C0_BADVADDR);
+               uasm_i_dmfc0(&p, K1, C0_ENTRYHI);
                uasm_i_xor(&p, K0, K0, K1);
-               UASM_i_SRL(&p, K0, K0, PAGE_SHIFT + 1);
+               uasm_i_dsrl32(&p, K1, K0, 62 - 32);
+               uasm_i_dsrl(&p, K0, K0, 12 + 1);
+               uasm_i_dsll32(&p, K0, K0, 64 + 12 + 1 - segbits - 32);
+               uasm_i_or(&p, K0, K0, K1);
                uasm_il_bnez(&p, &r, K0, label_leave);
                /* No need for uasm_i_nop */
        }