MIPS: Disable pte_special() for MIPS32 with RiXi

Commit 61cbfff4 ("MIPS: pte_special()/pte_mkspecial() support")
added a _PAGE_SPECIAL bit to the pgprot bits of our PTEs. Unfortunately
for MIPS32 configurations with RiXi support this pushed the number of
pgprot bits to 13. Since the PFN field in EntryLo begins at bit 12 this
results in us shifting the most significant bit of the physical address
beyond the end of the PTE, leading any mapped access to a physical
address above 2GB to incorrectly access an address 2GB lower than
intended.

For now, disable the pte_special() support for MIPS32 configurations
that support RiXi.

Fixes: 61cbfff4 ("MIPS: pte_special()/pte_mkspecial() support")
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Dmitry Korotin <dkorotin@wavecomp.com>
Cc: linux-mips@vger.kernel.org

arch/mips/Kconfig

@@ -84,7 +84,7 @@ config MIPS
 	select RTC_LIB
 	select SYSCTL_EXCEPTION_TRACE
 	select VIRT_TO_BUS
-	select ARCH_HAS_PTE_SPECIAL
+	select ARCH_HAS_PTE_SPECIAL if !(32BIT && CPU_HAS_RIXI)
 
 menu "Machine selection"
 

arch/mips/include/asm/pgtable-bits.h

@@ -52,7 +52,9 @@ enum pgtable_bits {
 	_PAGE_WRITE_SHIFT,
 	_PAGE_ACCESSED_SHIFT,
 	_PAGE_MODIFIED_SHIFT,
+#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
 	_PAGE_SPECIAL_SHIFT,
+#endif
 };
 
 /*
@@ -79,7 +81,9 @@ enum pgtable_bits {
 	_PAGE_WRITE_SHIFT,
 	_PAGE_ACCESSED_SHIFT,
 	_PAGE_MODIFIED_SHIFT,
+#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
 	_PAGE_SPECIAL_SHIFT,
+#endif
 };
 
 #elif defined(CONFIG_CPU_R3K_TLB)
@@ -92,7 +96,9 @@ enum pgtable_bits {
 	_PAGE_WRITE_SHIFT,
 	_PAGE_ACCESSED_SHIFT,
 	_PAGE_MODIFIED_SHIFT,
+#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
 	_PAGE_SPECIAL_SHIFT,
+#endif
 
 	/* Used by TLB hardware (placed in EntryLo) */
 	_PAGE_GLOBAL_SHIFT = 8,
@@ -116,7 +122,9 @@ enum pgtable_bits {
 #if defined(CONFIG_MIPS_HUGE_TLB_SUPPORT)
 	_PAGE_HUGE_SHIFT,
 #endif
+#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
 	_PAGE_SPECIAL_SHIFT,
+#endif
 
 	/* Used by TLB hardware (placed in EntryLo*) */
 #if defined(CONFIG_CPU_HAS_RIXI)
@@ -139,7 +147,11 @@ enum pgtable_bits {
 #if defined(CONFIG_MIPS_HUGE_TLB_SUPPORT)
 # define _PAGE_HUGE		(1 << _PAGE_HUGE_SHIFT)
 #endif
-#define _PAGE_SPECIAL		(1 << _PAGE_SPECIAL_SHIFT)
+#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
+# define _PAGE_SPECIAL		(1 << _PAGE_SPECIAL_SHIFT)
+#else
+# define _PAGE_SPECIAL		0
+#endif
 
 /* Used by TLB hardware (placed in EntryLo*) */
 #if defined(CONFIG_XPA)