MIPS: tlb-r4k: panic if the MMU doesn't support PAGE_SIZE

After writing the appropriate mask to the cop0 PageMask register, read
the register back & check it matches what we want. If it doesn't then
the MMU does not support the page size the kernel is configured for and
we're better off bailing than continuing to do odd things with TLB
exceptions.

Signed-off-by: Paul Burton <[email protected]>
Cc: Steven J. Hill <[email protected]>
Cc: Joshua Kinard <[email protected]>
Cc: Rafał Miłecki <[email protected]>
Cc: James Hogan <[email protected]>
Cc: Markos Chandras <[email protected]>
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/10691/
Signed-off-by: Ralf Baechle <[email protected]>

diff --git a/arch/mips/mm/tlb-r4k.c b/arch/mips/mm/tlb-r4k.c
index 5037d5868cef7ef47f1baaa74dc84b7da410c7d5..c17d7627f872bffd148dc093386a3cf8efd4ebd8 100644 (file)
--- a/arch/mips/mm/tlb-r4k.c
+++ b/arch/mips/mm/tlb-r4k.c
@@ -19,6 +19,7 @@
 #include <asm/cpu.h>
 #include <asm/cpu-type.h>
 #include <asm/bootinfo.h>
+#include <asm/hazards.h>
 #include <asm/mmu_context.h>
 #include <asm/pgtable.h>
 #include <asm/tlb.h>
@@ -486,6 +487,10 @@ static void r4k_tlb_configure(void)
         *     be set to fixed-size pages.
         */
        write_c0_pagemask(PM_DEFAULT_MASK);
+       back_to_back_c0_hazard();
+       if (read_c0_pagemask() != PM_DEFAULT_MASK)
+               panic("MMU doesn't support PAGE_SIZE=0x%lx", PAGE_SIZE);
+
        write_c0_wired(0);
        if (current_cpu_type() == CPU_R10000 ||
            current_cpu_type() == CPU_R12000 ||