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Merge patch series "riscv: Relocatable NOMMU kernels"

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Samuel Holland <samuel.holland@sifive.com> says:

Currently, RISC-V NOMMU kernels are linked at CONFIG_PAGE_OFFSET, and
since they are not relocatable, must be loaded at this address as well.
CONFIG_PAGE_OFFSET is not a user-visible Kconfig option, so its value is
not obvious, and users must patch the kernel source if they want to load
it at a different address.

Make NOMMU kernels more portable by making them relocatable by default.
This allows a single kernel binary to work when loaded at any address.

* b4-shazam-merge:
  riscv: Remove CONFIG_PAGE_OFFSET
  riscv: Support CONFIG_RELOCATABLE on riscv32
  asm-generic: Always define Elf_Rel and Elf_Rela
  riscv: Support CONFIG_RELOCATABLE on NOMMU
  riscv: Allow NOMMU kernels to access all of RAM
  riscv: Remove duplicate CONFIG_PAGE_OFFSET definition

Link: https://lore.kernel.org/r/20241026171441.3047904-1-samuel.holland@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Palmer Dabbelt
2025-03-26 15:55:45 -07:00
parent df02351331 e1cf2d009b
commit f633de4aa4
7 changed files with 73 additions and 82 deletions
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6
arch/riscv/include/asm/pgtable.h
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@@ -12,7 +12,11 @@
#include <asm/pgtable-bits.h>
#ifndef CONFIG_MMU
#define KERNEL_LINK_ADDR PAGE_OFFSET
#ifdef CONFIG_RELOCATABLE
#define KERNEL_LINK_ADDR UL(0)
#else
#define KERNEL_LINK_ADDR _AC(CONFIG_PHYS_RAM_BASE, UL)
#endif
#define KERN_VIRT_SIZE (UL(-1))
#else