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| author |   Paul Burton <paul.burton@imgtec.com> | 2015-07-13 17:12:44 +0100 |
|---|---|---|
| committer |   Ralf Baechle <ralf@linux-mips.org> | 2016-04-03 10:39:26 +0200 |
| commit | 091bc3a4049cb0cb28b8e3e71d8738387b91a007 (patch) | |
| tree | cd102c6a2e4ec7e8d1c467723467066cbc62bcc0 /arch/mips | |
| parent | MIPS: zboot: Remove copied source files on clean (diff) | |
| download | linux-dev-091bc3a4049cb0cb28b8e3e71d8738387b91a007.tar.xz linux-dev-091bc3a4049cb0cb28b8e3e71d8738387b91a007.zip | |
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 <paul.burton@imgtec.com>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Joshua Kinard <kumba@gentoo.org>
Cc: Rafał Miłecki <zajec5@gmail.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/10691/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/mm/tlb-r4k.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/mips/mm/tlb-r4k.c b/arch/mips/mm/tlb-r4k.c index 5037d5868cef..c17d7627f872 100644 --- 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 || |