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linux-stable/arch/riscv/lib
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Alexandre Ghiti 26e7aacb83
riscv: Allow to downgrade paging mode from the command line 
Add 2 early command line parameters that allow to downgrade satp mode
(using the same naming as x86):
- "no5lvl": use a 4-level page table (down from sv57 to sv48)
- "no4lvl": use a 3-level page table (down from sv57/sv48 to sv39)

Note that going through the device tree to get the kernel command line
works with ACPI too since the efi stub creates a device tree anyway with
the command line.

In KASAN kernels, we can't use the libfdt that early in the boot process
since we are not ready to execute instrumented functions. So instead of
using the "generic" libfdt, we compile our own versions of those functions
that are not instrumented and that are prefixed so that they do not
conflict with the generic ones. We also need the non-instrumented versions
of the string functions and the prefixed versions of memcpy/memmove.

This is largely inspired by commit aacd149b62 ("arm64: head: avoid
relocating the kernel twice for KASLR") from which I removed compilation
flags that were not relevant to RISC-V at the moment (LTO, SCS). Also
note that we have to link with -z norelro to avoid ld.lld to throw a
warning with the new .got sections, like in commit 311bea3cb9 ("arm64:
link with -z norelro for LLD or aarch64-elf").

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://lore.kernel.org/r/20230424092313.178699-2-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
 		2023-04-26 07:30:52 -07:00
..
Makefile RISC-V: Use Zicboz in clear_page when available 2023-03-14 21:26:06 -07:00
clear_page.S RISC-V: Use Zicboz in clear_page when available 2023-03-14 21:26:06 -07:00
delay.c include/linux/delay.h: replace kernel.h with the necessary inclusions 2021-11-09 10:02:49 -08:00
error-inject.c riscv: Add support for function error injection 2021-01-14 15:09:09 -08:00
memcpy.S riscv: Allow to downgrade paging mode from the command line 2023-04-26 07:30:52 -07:00
memmove.S riscv: Allow to downgrade paging mode from the command line 2023-04-26 07:30:52 -07:00
memset.S riscv: Add KASAN support 2020-01-22 13:09:58 -08:00
strcmp.S riscv: lib: Include hwcap.h directly 2023-03-14 20:51:24 -07:00
strlen.S riscv: Allow to downgrade paging mode from the command line 2023-04-26 07:30:52 -07:00
strncmp.S riscv: lib: Include hwcap.h directly 2023-03-14 20:51:24 -07:00
tishift.S
…
uaccess.S riscv: lib: uaccess: fix CSR_STATUS SR_SUM bit 2022-08-10 14:06:31 -07:00