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| author | Serge Semin <Sergey.Semin@baikalelectronics.ru> | 2020-05-06 19:42:30 +0200 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2020-05-19 17:39:32 +0200 |
| commit | 9ee195fd1be87719e5fcda4cbd7ba4454249f04f (patch) | |
| tree | 5ef3b3fcdd40e6dc231c1b90e4214c171877ae84 /arch/mips/mm/init.c | |
| parent | MIPS: Remove useless parameter of bootcmdline_init() (diff) | |
| download | linux-9ee195fd1be87719e5fcda4cbd7ba4454249f04f.tar.xz linux-9ee195fd1be87719e5fcda4cbd7ba4454249f04f.zip | |
mips: MAAR: Add XPA mode support
When XPA mode is enabled the normally 32-bits MAAR pair registers
are extended to be of 64-bits width as in pure 64-bits MIPS
architecture. In this case the MAAR registers can enable the
speculative loads/stores for addresses of up to 39-bits width.
But in this case the process of the MAAR initialization changes a bit.
The upper 32-bits of the registers are supposed to be accessed by mean
of the dedicated instructions mfhc0/mthc0 and there is a CP0.MAAR.VH
bit which should be set together with CP0.MAAR.VL as indication
of the boundary validity. All of these peculiarities were taken into
account in this commit so the speculative loads/stores would work
when XPA mode is enabled.
Co-developed-by: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Signed-off-by: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: linux-pm@vger.kernel.org
Cc: devicetree@vger.kernel.org
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips/mm/init.c')
| -rw-r--r-- | arch/mips/mm/init.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c index 79684000de0e..620ebfa45ec1 100644 --- a/arch/mips/mm/init.c +++ b/arch/mips/mm/init.c @@ -358,17 +358,23 @@ void maar_init(void) write_c0_maari(i); back_to_back_c0_hazard(); upper = read_c0_maar(); +#ifdef CONFIG_XPA + upper |= (phys_addr_t)readx_c0_maar() << MIPS_MAARX_ADDR_SHIFT; +#endif write_c0_maari(i + 1); back_to_back_c0_hazard(); lower = read_c0_maar(); +#ifdef CONFIG_XPA + lower |= (phys_addr_t)readx_c0_maar() << MIPS_MAARX_ADDR_SHIFT; +#endif attr = lower & upper; lower = (lower & MIPS_MAAR_ADDR) << 4; upper = ((upper & MIPS_MAAR_ADDR) << 4) | 0xffff; pr_info(" [%d]: ", i / 2); - if (!(attr & MIPS_MAAR_VL)) { + if ((attr & MIPS_MAAR_V) != MIPS_MAAR_V) { pr_cont("disabled\n"); continue; } |