riscv: Move early fdt mapping creation in its own function

Browse source

The code that handles the early fdt mapping is hard to read and does not
create the same mapping size depending on the kernel:

- for 64-bit, 2 PMD entries are used which amounts to a 4MB mapping
- for 32-bit, 2 PGDIR entries are used which amounts to a 8MB mapping

So keep using 2 PMD entries for 64-bit and use only one PGD entry for
32-bit needed to cover 4MB. Move that into a new function called
create_fdt_early_page_table which, using the same naming as
create_kernel_page_table.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

...

This commit is contained in:

Alexandre Ghiti 2021-07-23 15:01:28 +02:00 • committed by Palmer Dabbelt

parent 977765ce31

commit fe45ffa4c5

No known key found for this signature in database

GPG key ID: 2E1319F35FBB1889

1 changed files with 40 additions and 36 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

76

arch/riscv/mm/init.c

View file