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| author |   Palmer Dabbelt <palmerdabbelt@google.com> | 2020-04-14 13:43:24 +0900 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-05-18 11:38:05 -0700 |
| commit | 2d2682512f0faf4d09a696184bf3c0bb6838baca (patch) | |
| tree | 31d238d63d671ff6b8ade87e521186d30afec7e7 /arch/riscv/mm | |
| parent | Linux 5.7-rc6 (diff) | |
| download | wireguard-linux-2d2682512f0faf4d09a696184bf3c0bb6838baca.tar.xz wireguard-linux-2d2682512f0faf4d09a696184bf3c0bb6838baca.zip | |
riscv: Allow device trees to be built into the kernel
Some systems don't provide a useful device tree to the kernel on boot.
Chasing around bootloaders for these systems is a headache, so instead
le't's just keep a device tree table in the kernel, keyed by the SOC's
unique identifier, that contains the relevant DTB.
This is only implemented for M mode right now. While we could implement
this via the SBI calls that allow access to these identifiers, we don't
have any systems that need this right now.
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/mm')
| -rw-r--r-- | arch/riscv/mm/init.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 27a334106708..c18b3db4c507 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -17,6 +17,7 @@ #include <asm/fixmap.h> #include <asm/tlbflush.h> #include <asm/sections.h> +#include <asm/soc.h> #include <asm/pgtable.h> #include <asm/io.h> @@ -493,7 +494,15 @@ void free_initmem(void) #else asmlinkage void __init setup_vm(uintptr_t dtb_pa) { +#ifdef CONFIG_BUILTIN_DTB + dtb_early_va = soc_lookup_builtin_dtb(); + if (!dtb_early_va) { + /* Fallback to first available DTS */ + dtb_early_va = (void *) __dtb_start; + } +#else dtb_early_va = (void *)dtb_pa; +#endif } static inline void setup_vm_final(void) |