Hi! This is v1 of [0]. This is an attempt to map the U-Boot binary properly, but leave the area we load binaries unaffected and RWX.
There's a few changes since the RFC - Fixed the alignment of meminfo command when printing regions - 'meminfo' now prints arch specific attributes e.g PXN, UXN etc for arm instead of RW, RO, RX - Since we don't set the permissions of EFI runtime services yet and keep them as RWX, I removed the linker alignment changes which makes patch #3 easier to review. It's worth noting that qemu-arm sbsa was crashing with the efi services page aligned. This is probably due to a mismatch of memory, since the crash is only reproducible with QEMU instances that have < 2 GB of RAM. I'll fix that along with the efi runtime services - Defined memory attribute changes properly with an enum for RW, RO, RX instead of the hardcoded '1,2,3' I had on the RFC - Enabling mappings is now under a Kconfig (CONFIG_MMU_PGPROT), since peope reported crashes when testing this, which are orthogonal to this patch. We still have places in U-Boot where we define and later write const variables. This will lead to a crash now as const variables are properly managed and places in RO memory - Split patches to be easier to review - Added a patch updating 'meminfo' - Picked up acked-by tags from Jerome patch #1 adds printing capabilities for page mappings in 'meminfo' patch #2 adds documention in 'meminfo' command patch #3 prepares linker scripts, aligns sections in page boundaries etc patch #4 prepares an internal function to change the PTEs patch #5 adds function definitions & stubs for all archs patch #6 wires up the changes in U-Boot after it relocates [0] https://lore.kernel.org/u-boot/20250130072100.27297-1-ilias.apalodi...@linaro.org/ Ilias Apalodimas (6): meminfo: add memory details for armv8 doc: update meminfo with arch specific information arm: Prepare linker scripts for memory permissions arm64: mmu_change_region_attr() add an option not to break PTEs treewide: Add a function to change page permissions arm64: Enable RW, RX and RO mappings for the relocated binary arch/arc/lib/cache.c | 2 + arch/arm/cpu/arm926ejs/cache.c | 2 + arch/arm/cpu/armv7/cache_v7.c | 1 + arch/arm/cpu/armv7m/cache.c | 2 + arch/arm/cpu/armv8/cache_v8.c | 54 +++++++++++++++++-- arch/arm/cpu/armv8/fsl-layerscape/cpu.c | 10 ++-- arch/arm/cpu/armv8/u-boot.lds | 29 +++++----- arch/arm/include/asm/armv8/mmu.h | 2 + arch/arm/include/asm/system.h | 11 +++- arch/arm/lib/cache.c | 2 + arch/arm/mach-snapdragon/board.c | 2 +- arch/m68k/lib/cache.c | 2 + arch/nios2/lib/cache.c | 2 + arch/powerpc/lib/cache.c | 2 + arch/riscv/lib/cache.c | 2 + arch/sh/cpu/sh4/cache.c | 2 + arch/xtensa/lib/cache.c | 2 + cmd/meminfo.c | 5 ++ common/Kconfig | 13 +++++ common/board_r.c | 20 +++++++ doc/usage/cmd/meminfo.rst | 71 ++++++++++++++++++------- include/asm-generic/sections.h | 2 + include/cpu_func.h | 16 ++++++ 23 files changed, 215 insertions(+), 41 deletions(-) -- 2.47.2
