Since ARM platforms do not have a common memory map, add a helper function that finds the lowest address region with the EFI_MEMORY_WB attribute set in the UEFI memory map.
Required for the arm/arm64 linux loader to restrict the initrd location to where it will be accessible by the kernel at runtime. Signed-off-by: Leif Lindholm <leif.lindh...@linaro.org> --- grub-core/kern/efi/mm.c | 36 ++++++++++++++++++++++++++++++++++++ include/grub/efi/efi.h | 3 +++ 2 files changed, 39 insertions(+) diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c index 31ca703ec..8413c19e5 100644 --- a/grub-core/kern/efi/mm.c +++ b/grub-core/kern/efi/mm.c @@ -569,3 +569,39 @@ grub_efi_mm_init (void) grub_efi_free_pages ((grub_addr_t) memory_map, 2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE)); } + +#if defined (__aarch64__) +grub_err_t +grub_efi_get_ram_base(grub_addr_t *base_addr) +{ + grub_efi_memory_descriptor_t *memory_map; + grub_efi_memory_descriptor_t *desc; + grub_efi_uintn_t mmap_size; + grub_efi_uintn_t desc_size; + int ret; + + mmap_size = grub_efi_find_mmap_size(); + + memory_map = grub_malloc (mmap_size); + if (! memory_map) + return GRUB_ERR_OUT_OF_MEMORY; + ret = grub_efi_get_memory_map (&mmap_size, memory_map, NULL, + &desc_size, NULL); + + if (ret < 1) + return GRUB_ERR_BUG; + + for (desc = memory_map, *base_addr = GRUB_UINT_MAX; + (grub_addr_t) desc < ((grub_addr_t) memory_map + mmap_size); + desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size)) + { + if (desc->attribute & GRUB_EFI_MEMORY_WB) + if (desc->physical_start < *base_addr) + *base_addr = desc->physical_start; + } + + grub_free(memory_map); + + return GRUB_ERR_NONE; +} +#endif diff --git a/include/grub/efi/efi.h b/include/grub/efi/efi.h index 3984de083..80ab56795 100644 --- a/include/grub/efi/efi.h +++ b/include/grub/efi/efi.h @@ -85,6 +85,9 @@ extern void (*EXPORT_VAR(grub_efi_net_config)) (grub_efi_handle_t hnd, #if defined(__arm__) || defined(__aarch64__) void *EXPORT_FUNC(grub_efi_get_firmware_fdt)(void); #endif +#if defined(__aarch64__) +grub_err_t EXPORT_FUNC(grub_efi_get_ram_base)(grub_addr_t *); +#endif grub_addr_t grub_efi_modules_addr (void); -- 2.11.0 _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel