RISC-V: Fixmap support and MM cleanups

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This patchset does:
1. Moves MM related code from kernel/setup.c to mm/init.c
2. Implements compile-time fixed mappings

Using fixed mappings, we get earlyprints even without SBI calls.

For example, we can now use kernel parameter
"earlycon=uart8250,mmio,0x10000000"
to get early prints on QEMU virt machine without using SBI calls.

The patchset is tested on QEMU virt machine.

Palmer: It looks like some of the code movement here conflicted with the
patches to move hartid handling around.  As far as I can tell the only
changed code was in smp_setup_processor_id(), and I've kept the one in
smp.c.

...

This commit is contained in:

Palmer Dabbelt 2019-03-04 11:41:36 -08:00

parent f7ccc35aa3 823900cd01

commit 13fd5de065

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GPG key ID: EF4CA1502CCBAB41

6 changed files with 208 additions and 128 deletions

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3

arch/riscv/Kconfig

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44

arch/riscv/include/asm/fixmap.h

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1

arch/riscv/include/asm/pgtable.h

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130

arch/riscv/kernel/setup.c

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2

arch/riscv/kernel/smp.c

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156

arch/riscv/mm/init.c

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