On x86 traditional E820 table is used to pass the memory information to kernel. With EFI loader we can build the EFI memory map from it.
Signed-off-by: Bin Meng bmeng.cn@gmail.com Reviewed-by: Simon Glass sjg@chromium.org ---
Changes in v2: None
arch/x86/lib/e820.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+)
diff --git a/arch/x86/lib/e820.c b/arch/x86/lib/e820.c index 9a9ec99..8b34f67 100644 --- a/arch/x86/lib/e820.c +++ b/arch/x86/lib/e820.c @@ -4,6 +4,7 @@ */
#include <common.h> +#include <efi_loader.h> #include <asm/e820.h>
DECLARE_GLOBAL_DATA_PTR; @@ -34,3 +35,41 @@ __weak unsigned int install_e820_map(unsigned int max_entries,
return 4; } + +#if defined(CONFIG_EFI_LOADER) && !defined(CONFIG_SPL_BUILD) +void efi_add_known_memory(void) +{ + struct e820_entry e820[E820MAX]; + unsigned int i, num; + u64 start, pages; + int type; + + num = install_e820_map(ARRAY_SIZE(e820), e820); + + for (i = 0; i < num; ++i) { + start = e820[i].addr; + pages = ALIGN(e820[i].size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT; + + switch (e820[i].type) { + case E820_RAM: + type = EFI_CONVENTIONAL_MEMORY; + break; + case E820_RESERVED: + type = EFI_RESERVED_MEMORY_TYPE; + break; + case E820_ACPI: + type = EFI_ACPI_RECLAIM_MEMORY; + break; + case E820_NVS: + type = EFI_ACPI_MEMORY_NVS; + break; + case E820_UNUSABLE: + default: + type = EFI_UNUSABLE_MEMORY; + break; + } + + efi_add_memory_map(start, pages, type, false); + } +} +#endif /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */