[U-Boot] [PATCH v3 3/8] x86: slimbootloader: Add memory configuration
Park, Aiden
aiden.park at intel.com
Tue Jul 9 19:02:18 UTC 2019
Slim Bootloader provides memory map info thru its HOB list pointer.
Configure memory size and relocation memory from the HOB data, and
provide e820 entries as well.
- 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 at intel.com>
---
Changes in v3:
* Use HOB function from the common HOB library
* Add more description
arch/x86/cpu/slimbootloader/Makefile | 2 +-
arch/x86/cpu/slimbootloader/dram.c | 146 ++++++++++++++++++
.../asm/arch-slimbootloader/slimbootloader.h | 44 ++++++
3 files changed, 191 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 627a721e8c..05d0ca4a19 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
+obj-y += car.o slimbootloader.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..48740c301f
--- /dev/null
+++ b/arch/x86/cpu/slimbootloader/dram.c
@@ -0,0 +1,151 @@
+// 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;
+
+ if (!gd->arch.hob_list)
+ return NULL;
+
+ return hob_get_guid_hob_data(gd->arch.hob_list, NULL, &guid);
+}
+
+/**
+ * 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 from Slim Bootloader based on physical
+ * start memory address, from low to high. So do reversed search to
+ * get highest usable, suitable size, 4KB aligned available memory
+ * under 4GB.
+ */
+ 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 from Slim Bootloader based on physical
+ * start memory address, from low to high. So do reversed search to
+ * simply get highest usable memory address as ram size
+ */
+ 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 7309a83724..d9265ac534 100644
--- a/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h
+++ b/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h
@@ -7,5 +7,49 @@
#define __SLIMBOOTLOADER_ARCH_H__
#include <common.h>
+#include <asm/hob.h>
+
+/**
+ * A GUID to get MemoryMap info hob which is provided by Slim Bootloader
+ */
+#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: usable: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 is sorted based on physical start
+ * address, from low to high, and carved out reserved, acpi nvs, acpi reclaim
+ * and usable memory.
+ *
+ * @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;
#endif
--
2.20.1
More information about the U-Boot
mailing list