- Get memory size from the memory map info hob - Set ram top for U-Boot relocation lower than 4GB - Provide e820 entries from the memory map info hob
Signed-off-by: Aiden Park aiden.park@intel.com --- arch/x86/cpu/slimbootloader/Makefile | 2 +- arch/x86/cpu/slimbootloader/dram.c | 139 ++++++++++++++++++ .../asm/arch-slimbootloader/slimbootloader.h | 38 +++++ 3 files changed, 178 insertions(+), 1 deletion(-) create mode 100644 arch/x86/cpu/slimbootloader/dram.c
diff --git a/arch/x86/cpu/slimbootloader/Makefile b/arch/x86/cpu/slimbootloader/Makefile index 620fc8a139..4b0b3e71c9 100644 --- a/arch/x86/cpu/slimbootloader/Makefile +++ b/arch/x86/cpu/slimbootloader/Makefile @@ -2,4 +2,4 @@ # # Copyright (C) 2019 Intel Corporation <www.intel.com>
-obj-y += car.o slimbootloader.o hob.o +obj-y += car.o slimbootloader.o hob.o dram.o diff --git a/arch/x86/cpu/slimbootloader/dram.c b/arch/x86/cpu/slimbootloader/dram.c new file mode 100644 index 0000000000..1defdad1c9 --- /dev/null +++ b/arch/x86/cpu/slimbootloader/dram.c @@ -0,0 +1,139 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019 Intel Corporation <www.intel.com> + */ + +#include <common.h> +#include <linux/sizes.h> +#include <asm/e820.h> +#include <asm/arch/slimbootloader.h> + +DECLARE_GLOBAL_DATA_PTR; + +/** + * This returns a data pointer of memory map info from the guid hob. + * + * @return: A data pointer of memory map info hob + */ +static void *get_memory_map_info(void) +{ + const struct efi_guid guid = LOADER_MEMORY_MAP_INFO_GUID; + + return get_next_guid_hob_data(&guid, gd->arch.hob_list); +} + +/** + * This is to give usable memory region information for u-boot relocation. + * so search usable memory region lower than 4GB. + * The memory map entries from Slim Bootloader hob are already sorted. + * + * @total_size: The memory size that u-boot occupies + * @return : The top available memory address lower than 4GB + */ +ulong board_get_usable_ram_top(ulong total_size) +{ + struct memory_map_info *data = NULL; + int i = 0; + phys_addr_t addr_start = 0; + phys_addr_t addr_end = 0; + ulong ram_top = 0; + + data = (struct memory_map_info *)get_memory_map_info(); + if (!data) + panic("memory map info hob not found\n"); + + /* sorted memory map entries, so reversed search */ + for (i = data->count - 1; i >= 0; i--) { + if (data->entry[i].type != E820_RAM) + continue; + + addr_start = data->entry[i].addr; + addr_end = addr_start + data->entry[i].size; + + if (addr_start > SZ_4G) + continue; + + if (addr_end > SZ_4G) + addr_end = SZ_4G; + + if (addr_end < total_size) + continue; + + /* to relocate u-boot at 4K aligned memory */ + addr_end = rounddown(addr_end - total_size, SZ_4K); + if (addr_end >= addr_start) { + ram_top = (ulong)addr_end + total_size; + break; + } + } + + if (!ram_top) + panic("failed to find available memory for relocation!"); + + return ram_top; +} + +/** + * The memory initialization has already been done in previous Slim Bootloader + * stage thru FSP-M. Instead, this sets the ram_size from the memory map info + * hob. + */ +int dram_init(void) +{ + struct memory_map_info *data = NULL; + int i = 0; + phys_size_t ram_size = 0; + + data = (struct memory_map_info *)get_memory_map_info(); + if (!data) + panic("memory map info hob not found\n"); + + /* sorted memory map entries, so reversed search */ + for (i = data->count - 1; i >= 0; i--) { + if (data->entry[i].type != E820_RAM) + continue; + + /* simply use the highest usable memory address as ram size */ + ram_size = data->entry[i].addr + data->entry[i].size; + break; + } + + if (!ram_size) + panic("failed to detect memory size"); + + gd->ram_size = ram_size; + return 0; +} + +int dram_init_banksize(void) +{ + /* simply use a single bank to have whole size for now */ + if (CONFIG_NR_DRAM_BANKS) { + gd->bd->bi_dram[0].start = 0; + gd->bd->bi_dram[0].size = gd->ram_size; + } + return 0; +} + +unsigned int install_e820_map(unsigned int max_entries, + struct e820_entry *entries) +{ + struct memory_map_info *data = NULL; + int i = 0; + unsigned int num_entries = 0; + + data = (struct memory_map_info *)get_memory_map_info(); + if (!data) { + debug("memory map info hob not found\n"); + return 0; + } + + for (i = 0; i < data->count; i++) { + entries[num_entries].addr = data->entry[i].addr; + entries[num_entries].size = data->entry[i].size; + entries[num_entries].type = data->entry[i].type; + num_entries++; + } + + return num_entries; +} diff --git a/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h b/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h index bd1f4ee374..c85201e711 100644 --- a/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h +++ b/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h @@ -10,6 +10,44 @@ #include <asm/fsp/fsp_types.h> #include <asm/fsp/fsp_hob.h>
+#define LOADER_MEMORY_MAP_INFO_GUID \ + { \ + 0xa1ff7424, 0x7a1a, 0x478e, \ + { 0xa9, 0xe4, 0x92, 0xf3, 0x57, 0xd1, 0x28, 0x32 } \ + } + +/** + * A single entry of memory map information + * + * @addr: start address of a memory map entry + * @size: size of a memory map entry + * @type: ram:1, reserved:2, acpi:3, nvs:4, unusable:5 + * @flag: only used in Slim Bootloader + * @rsvd: padding for alignment + */ +struct memory_map_entry { + phys_addr_t addr; + phys_size_t size; + u8 type; + u8 flag; + u8 rsvd[6]; +} __packed; + +/** + * This includes all memory map entries which are sorted. + * + * @rev : revision of memory_map_info structure. currently 1. + * @rsvd : padding for alignment + * @count: the number of memory map entries + * @entry: array of all memory map entries + */ +struct memory_map_info { + u8 rev; + u8 rsvd[3]; + u32 count; + struct memory_map_entry entry[0]; +} __packed; + /** * This returns a pointer to hob data buffer if the given guid hob is found. *