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| author | Max Filippov <jcmvbkbc@gmail.com> | 2016-04-11 21:14:17 +0300 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2016-07-24 06:33:58 +0300 |
| commit | d39af90265feb40ec198c4ca8268724645b4b50e (patch) | |
| tree | 32c3aed4a66a243251ca0a9e195c4ba8e6dddeeb /arch/xtensa/include/asm/initialize_mmu.h | |
| parent | f1883aa7d63e3be92ad18da7a1bfc6c9b15c4f9a (diff) | |
| download | lwn-d39af90265feb40ec198c4ca8268724645b4b50e.tar.gz lwn-d39af90265feb40ec198c4ca8268724645b4b50e.zip | |
xtensa: add alternative kernel memory layouts
MMUv3 is able to support low memory bigger than 128MB.
Implement 256MB and 512MB KSEG layouts:
- add Kconfig selector for KSEG layout;
- add KSEG base address, size and alignment definitions to
arch/xtensa/include/asm/kmem_layout.h;
- use new definitions in TLB initialization;
- add build time memory map consistency checks.
See Documentation/xtensa/mmu.txt for the details of new memory layouts.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/include/asm/initialize_mmu.h')
| -rw-r--r-- | arch/xtensa/include/asm/initialize_mmu.h | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/arch/xtensa/include/asm/initialize_mmu.h b/arch/xtensa/include/asm/initialize_mmu.h index 7a1e075969a3..46d4bef61655 100644 --- a/arch/xtensa/include/asm/initialize_mmu.h +++ b/arch/xtensa/include/asm/initialize_mmu.h @@ -116,22 +116,35 @@ add a5, a5, a4 bne a5, a2, 3b - /* Step 4: Setup MMU with the old V2 mappings. */ + /* Step 4: Setup MMU with the requested static mappings. */ + movi a6, 0x01000000 wsr a6, ITLBCFG wsr a6, DTLBCFG isync - movi a5, 0xd0000005 - movi a4, CA_WRITEBACK + movi a5, XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_TLB_WAY + movi a4, XCHAL_KSEG_PADDR + CA_WRITEBACK + wdtlb a4, a5 + witlb a4, a5 + + movi a5, XCHAL_KSEG_BYPASS_VADDR + XCHAL_KSEG_TLB_WAY + movi a4, XCHAL_KSEG_PADDR + CA_BYPASS wdtlb a4, a5 witlb a4, a5 - movi a5, 0xd8000005 - movi a4, CA_BYPASS +#ifdef CONFIG_XTENSA_KSEG_512M + movi a5, XCHAL_KSEG_CACHED_VADDR + 0x10000000 + XCHAL_KSEG_TLB_WAY + movi a4, XCHAL_KSEG_PADDR + 0x10000000 + CA_WRITEBACK wdtlb a4, a5 witlb a4, a5 + movi a5, XCHAL_KSEG_BYPASS_VADDR + 0x10000000 + XCHAL_KSEG_TLB_WAY + movi a4, XCHAL_KSEG_PADDR + 0x10000000 + CA_BYPASS + wdtlb a4, a5 + witlb a4, a5 +#endif + movi a5, XCHAL_KIO_CACHED_VADDR + 6 movi a4, XCHAL_KIO_DEFAULT_PADDR + CA_WRITEBACK wdtlb a4, a5 |