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
..
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
Makefile	RISC-V: Use Zicboz in clear_page when available	2023-03-14 21:26:06 -07:00
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	riscv: Less inefficient gcc tishift helpers (and export their symbols)	2020-01-18 19:13:41 -08:00
uaccess.S	riscv: lib: uaccess: fix CSR_STATUS SR_SUM bit	2022-08-10 14:06:31 -07:00