On 06/15/2012 01:09 AM, Huacai Chen wrote:
Loongson-3 is a multi-core MIPS family CPU, it support MIPS64R2
fully. Loongson-3 has the same IMP field (0x6300) as Loongson-2.
Loongson-3 has a hardware-maintained cache, system software doesn't
need to maintain coherency.
Loongson-3A is the first revision of Loongson-3, and it is the quad-
core version of Loongson-2G. Loongson-3A has a simplified version named
Loongson-2Gq, the main difference between Loongson-3A/2Gq is 3A has two
HyperTransport controller but 2Gq has only one. HT0 is used for cross-
chip interconnection and HT1 is used to link PCI bus. Therefore, 2Gq
cannot support NUMA but 3A can.
Exsisting Loongson family CPUs:
Loongson-1: Loongson-1A, Loongson-1B, they are 32-bit MIPS CPUs.
Loongson-2: Loongson-2E, Loongson-2F, Loongson-2G(including Loongson-
2Gq), they are 64-bit MIPS CPUs.
Loongson-3: Loongson-3A, it is a 64-bit MIPS CPU.
Signed-off-by: Huacai Chen<chenhc@xxxxxxxxxx>
Signed-off-by: Hongliang Tao<taohl@xxxxxxxxxx>
Signed-off-by: Hua Yan<yanh@xxxxxxxxxx>
---
arch/mips/Kconfig | 13 ++++
arch/mips/include/asm/addrspace.h | 6 ++
arch/mips/include/asm/cpu.h | 6 +-
arch/mips/include/asm/mach-loongson/spaces.h | 15 +++++
arch/mips/include/asm/module.h | 2 +
arch/mips/include/asm/pgtable-bits.h | 7 ++
arch/mips/kernel/Makefile | 1 +
arch/mips/kernel/cpu-probe.c | 12 +++-
arch/mips/lib/Makefile | 1 +
arch/mips/loongson/Kconfig | 4 +
arch/mips/loongson/Platform | 1 +
arch/mips/loongson/common/env.c | 3 +
arch/mips/loongson/common/setup.c | 6 +-
arch/mips/mm/Makefile | 1 +
arch/mips/mm/c-r4k.c | 84 ++++++++++++++++++++++++++
arch/mips/mm/tlb-r4k.c | 2 +-
arch/mips/mm/tlbex.c | 1 +
17 files changed, 156 insertions(+), 9 deletions(-)
This patch is too big. It should be split up into smaller but related
parts.
For example, the parts that add new identifier constants should be
first. Then a separate patch for cpu-probe.c where they are used.
And...
create mode 100644 arch/mips/include/asm/mach-loongson/spaces.h
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index c179461..38e460b 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1544,6 +1544,16 @@ config CPU_LOONGSON2
select CPU_SUPPORTS_64BIT_KERNEL
select CPU_SUPPORTS_HIGHMEM
+config CPU_LOONGSON3
+ bool "Loongson 3 CPU"
+ depends on SYS_HAS_CPU_LOONGSON3
+ select CPU_SUPPORTS_32BIT_KERNEL
+ select CPU_SUPPORTS_64BIT_KERNEL
+ select CPU_SUPPORTS_HIGHMEM
+ help
+ The Loongson 3 processor implements the MIPS III instruction set
+ with many extensions.
+
This bit must be the very last patch of the entire set, not the first.
Ask yourself what would happen if someone did a build selecting
CPU_LOONGSON3 after this patch were applied? Would a runnable kernel
result? If the answer is no, then you did it in the wrong order.
David Daney
