diff options
Diffstat (limited to 'lib/efi_loader')
| -rw-r--r-- | lib/efi_loader/efi_memory.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c index f225a9028c..73bfbb65c4 100644 --- a/lib/efi_loader/efi_memory.c +++ b/lib/efi_loader/efi_memory.c @@ -551,8 +551,13 @@ efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size, __weak void efi_add_known_memory(void) { + u64 ram_top = board_get_usable_ram_top(0) & ~EFI_PAGE_MASK; int i; + /* Fix for 32bit targets with ram_top at 4G */ + if (!ram_top) + ram_top = 0x100000000ULL; + /* Add RAM */ for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { u64 ram_end, ram_start, pages; @@ -564,11 +569,32 @@ __weak void efi_add_known_memory(void) ram_end &= ~EFI_PAGE_MASK; ram_start = (ram_start + EFI_PAGE_MASK) & ~EFI_PAGE_MASK; - if (ram_end > ram_start) { - pages = (ram_end - ram_start) >> EFI_PAGE_SHIFT; + if (ram_end <= ram_start) { + /* Invalid mapping, keep going. */ + continue; + } + + pages = (ram_end - ram_start) >> EFI_PAGE_SHIFT; + efi_add_memory_map(ram_start, pages, + EFI_CONVENTIONAL_MEMORY, false); + + /* + * Boards may indicate to the U-Boot memory core that they + * can not support memory above ram_top. Let's honor this + * in the efi_loader subsystem too by declaring any memory + * above ram_top as "already occupied by firmware". + */ + if (ram_top < ram_start) { + /* ram_top is before this region, reserve all */ efi_add_memory_map(ram_start, pages, - EFI_CONVENTIONAL_MEMORY, false); + EFI_BOOT_SERVICES_DATA, true); + } else if ((ram_top >= ram_start) && (ram_top < ram_end)) { + /* ram_top is inside this region, reserve parts */ + pages = (ram_end - ram_top) >> EFI_PAGE_SHIFT; + + efi_add_memory_map(ram_top, pages, + EFI_BOOT_SERVICES_DATA, true); } } } |