powerpc/8xx: Move additional DTLBMiss handlers out of exception area

When all options are activated, there is not enough space for the
DTLBMiss handlers that handles IMMR area and linear RAM pages in
the exception area once we have added hugepage handling.
So lets move them after .0x2000

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <oss@buserror.net>

diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 451e789..f674dfa 100644 (file)
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -380,26 +380,6 @@ InstructionTLBMiss:
        EXCEPTION_EPILOG_0
        rfi
 
-/*
- * Bottom part of DataStoreTLBMiss handler for IMMR area
- * not enough space in the DataStoreTLBMiss area
- */
-DTLBMissIMMR:
-       mtcr    r10
-       /* Set 512k byte guarded page and mark it valid */
-       li      r10, MD_PS512K | MD_GUARDED | MD_SVALID
-       MTSPR_CPU6(SPRN_MD_TWC, r10, r11)
-       mfspr   r10, SPRN_IMMR                  /* Get current IMMR */
-       rlwinm  r10, r10, 0, 0xfff80000         /* Get 512 kbytes boundary */
-       ori     r10, r10, 0xf0 | MD_SPS16K | _PAGE_SHARED | _PAGE_DIRTY | \
-                         _PAGE_PRESENT | _PAGE_NO_CACHE
-       MTSPR_CPU6(SPRN_MD_RPN, r10, r11)       /* Update TLB entry */
-
-       li      r11, RPN_PATTERN
-       mtspr   SPRN_DAR, r11   /* Tag DAR */
-       EXCEPTION_EPILOG_0
-       rfi
-
        . = 0x1200
 DataStoreTLBMiss:
        EXCEPTION_PROLOG_0
@@ -418,7 +398,7 @@ DataStoreTLBMiss:
 _ENTRY(DTLBMiss_jmp)
        beq-    DTLBMissIMMR
 #endif
-       bge-    cr7, 4f
+       bge-    cr7, DTLBMissLinear
 
        mfspr   r11, SPRN_M_TW  /* Get level 1 table */
 3:
@@ -485,27 +465,6 @@ _ENTRY(DTLBMiss_jmp)
        EXCEPTION_EPILOG_0
        rfi
 
-4:
-_ENTRY(DTLBMiss_cmp)
-       cmpli   cr0, r11, (PAGE_OFFSET + 0x1800000)@h
-       lis     r11, (swapper_pg_dir-PAGE_OFFSET)@ha
-       bge-    3b
-
-       mtcr    r10
-       /* Set 8M byte page and mark it valid */
-       li      r10, MD_PS8MEG | MD_SVALID
-       MTSPR_CPU6(SPRN_MD_TWC, r10, r11)
-       mfspr   r10, SPRN_MD_EPN
-       rlwinm  r10, r10, 0, 0x0f800000         /* 8xx supports max 256Mb RAM */
-       ori     r10, r10, 0xf0 | MD_SPS16K | _PAGE_SHARED | _PAGE_DIRTY | \
-                         _PAGE_PRESENT
-       MTSPR_CPU6(SPRN_MD_RPN, r10, r11)       /* Update TLB entry */
-
-       li      r11, RPN_PATTERN
-       mtspr   SPRN_DAR, r11   /* Tag DAR */
-       EXCEPTION_EPILOG_0
-       rfi
-
 
 /* This is an instruction TLB error on the MPC8xx.  This could be due
  * to many reasons, such as executing guarded memory or illegal instruction
@@ -567,6 +526,47 @@ DARFixed:/* Return from dcbx instruction bug workaround */
 
        . = 0x2000
 
+/*
+ * Bottom part of DataStoreTLBMiss handlers for IMMR area and linear RAM.
+ * not enough space in the DataStoreTLBMiss area.
+ */
+DTLBMissIMMR:
+       mtcr    r10
+       /* Set 512k byte guarded page and mark it valid */
+       li      r10, MD_PS512K | MD_GUARDED | MD_SVALID
+       MTSPR_CPU6(SPRN_MD_TWC, r10, r11)
+       mfspr   r10, SPRN_IMMR                  /* Get current IMMR */
+       rlwinm  r10, r10, 0, 0xfff80000         /* Get 512 kbytes boundary */
+       ori     r10, r10, 0xf0 | MD_SPS16K | _PAGE_SHARED | _PAGE_DIRTY | \
+                         _PAGE_PRESENT | _PAGE_NO_CACHE
+       MTSPR_CPU6(SPRN_MD_RPN, r10, r11)       /* Update TLB entry */
+
+       li      r11, RPN_PATTERN
+       mtspr   SPRN_DAR, r11   /* Tag DAR */
+       EXCEPTION_EPILOG_0
+       rfi
+
+DTLBMissLinear:
+_ENTRY(DTLBMiss_cmp)
+       cmpli   cr0, r11, (PAGE_OFFSET + 0x1800000)@h
+       lis     r11, (swapper_pg_dir-PAGE_OFFSET)@ha
+       bge-    3b
+
+       mtcr    r10
+       /* Set 8M byte page and mark it valid */
+       li      r10, MD_PS8MEG | MD_SVALID
+       MTSPR_CPU6(SPRN_MD_TWC, r10, r11)
+       mfspr   r10, SPRN_MD_EPN
+       rlwinm  r10, r10, 0, 0x0f800000         /* 8xx supports max 256Mb RAM */
+       ori     r10, r10, 0xf0 | MD_SPS16K | _PAGE_SHARED | _PAGE_DIRTY | \
+                         _PAGE_PRESENT
+       MTSPR_CPU6(SPRN_MD_RPN, r10, r11)       /* Update TLB entry */
+
+       li      r11, RPN_PATTERN
+       mtspr   SPRN_DAR, r11   /* Tag DAR */
+       EXCEPTION_EPILOG_0
+       rfi
+
 /* This is the procedure to calculate the data EA for buggy dcbx,dcbi instructions
  * by decoding the registers used by the dcbx instruction and adding them.
  * DAR is set to the calculated address.