mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-08 12:16:16 +09:00
5ae5aa9310
U-Boot sets up the real mode interrupt handler stubs starting from address 0x1000. In most cases, the first 640K (0x00000 - 0x9ffff) system memory is reported as system RAM in E820 table to the OS. (see install_e820_map() implementation for each platform). So OS can use these memories whatever it wants. If U-Boot is in an S3 resume path, care must be taken not to corrupt these memorie otherwise OS data gets lost. Testing shows that, on Microsoft Windows 10 on Intel Baytrail its wake up vector happens to be installed at the same address 0x1000. While on Linux its wake up vector does not overlap this memory range, but after resume kernel checks low memory range per config option CONFIG_X86_RESERVE_LOW which is 64K by default to see whether a memory corruption occurs during the suspend/resume (it's harmless, but warnings are shown in the kernel dmesg logs). We cannot simply mark the these memory as reserved in E820 table because such configuration makes GRUB complain: unable to allocate real mode page. Hence we choose to back up these memories to the place where we reserved on our stack for our S3 resume work. Before jumping to OS wake up vector, we need restore the original content there. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Stefan Roese <sr@denx.de>
147 lines
3.4 KiB
C
147 lines
3.4 KiB
C
/*
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* (C) Copyright 2002-2010
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __ASM_GBL_DATA_H
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#define __ASM_GBL_DATA_H
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#ifndef __ASSEMBLY__
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#include <asm/processor.h>
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enum pei_boot_mode_t {
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PEI_BOOT_NONE = 0,
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PEI_BOOT_SOFT_RESET,
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PEI_BOOT_RESUME,
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};
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struct dimm_info {
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uint32_t dimm_size;
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uint16_t ddr_type;
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uint16_t ddr_frequency;
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uint8_t rank_per_dimm;
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uint8_t channel_num;
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uint8_t dimm_num;
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uint8_t bank_locator;
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/* The 5th byte is '\0' for the end of string */
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uint8_t serial[5];
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/* The 19th byte is '\0' for the end of string */
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uint8_t module_part_number[19];
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uint16_t mod_id;
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uint8_t mod_type;
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uint8_t bus_width;
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} __packed;
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struct pei_memory_info {
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uint8_t dimm_cnt;
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/* Maximum num of dimm is 8 */
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struct dimm_info dimm[8];
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} __packed;
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struct memory_area {
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uint64_t start;
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uint64_t size;
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};
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struct memory_info {
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int num_areas;
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uint64_t total_memory;
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uint64_t total_32bit_memory;
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struct memory_area area[CONFIG_NR_DRAM_BANKS];
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};
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#define MAX_MTRR_REQUESTS 8
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/**
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* A request for a memory region to be set up in a particular way. These
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* requests are processed before board_init_r() is called. They are generally
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* optional and can be ignored with some performance impact.
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*/
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struct mtrr_request {
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int type; /* MTRR_TYPE_... */
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uint64_t start;
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uint64_t size;
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};
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/* Architecture-specific global data */
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struct arch_global_data {
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u64 gdt[X86_GDT_NUM_ENTRIES] __aligned(16);
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struct global_data *gd_addr; /* Location of Global Data */
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uint8_t x86; /* CPU family */
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uint8_t x86_vendor; /* CPU vendor */
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uint8_t x86_model;
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uint8_t x86_mask;
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uint32_t x86_device;
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uint64_t tsc_base; /* Initial value returned by rdtsc() */
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void *new_fdt; /* Relocated FDT */
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uint32_t bist; /* Built-in self test value */
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enum pei_boot_mode_t pei_boot_mode;
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const struct pch_gpio_map *gpio_map; /* board GPIO map */
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struct memory_info meminfo; /* Memory information */
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struct pei_memory_info pei_meminfo; /* PEI memory information */
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#ifdef CONFIG_HAVE_FSP
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void *hob_list; /* FSP HOB list */
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#endif
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struct mtrr_request mtrr_req[MAX_MTRR_REQUESTS];
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int mtrr_req_count;
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int has_mtrr;
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/* MRC training data to save for the next boot */
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char *mrc_output;
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unsigned int mrc_output_len;
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ulong table; /* Table pointer from previous loader */
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int turbo_state; /* Current turbo state */
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struct irq_routing_table *pirq_routing_table;
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#ifdef CONFIG_SEABIOS
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u32 high_table_ptr;
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u32 high_table_limit;
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#endif
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#ifdef CONFIG_HAVE_ACPI_RESUME
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int prev_sleep_state; /* Previous sleep state ACPI_S0/1../5 */
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ulong backup_mem; /* Backup memory address for S3 */
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#endif
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};
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#endif
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#include <asm-generic/global_data.h>
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#ifndef __ASSEMBLY__
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# if defined(CONFIG_EFI_APP) || CONFIG_IS_ENABLED(X86_64)
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/* TODO(sjg@chromium.org): Consider using a fixed register for gd on x86_64 */
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#define gd global_data_ptr
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#define DECLARE_GLOBAL_DATA_PTR extern struct global_data *global_data_ptr
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# else
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static inline __attribute__((no_instrument_function)) gd_t *get_fs_gd_ptr(void)
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{
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gd_t *gd_ptr;
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#if CONFIG_IS_ENABLED(X86_64)
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asm volatile("fs mov 0, %0\n" : "=r" (gd_ptr));
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#else
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asm volatile("fs movl 0, %0\n" : "=r" (gd_ptr));
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#endif
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return gd_ptr;
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}
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#define gd get_fs_gd_ptr()
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#define DECLARE_GLOBAL_DATA_PTR
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# endif
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#endif
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/*
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* Our private Global Data Flags
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*/
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#define GD_FLG_COLD_BOOT 0x10000 /* Cold Boot */
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#define GD_FLG_WARM_BOOT 0x20000 /* Warm Boot */
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#endif /* __ASM_GBL_DATA_H */
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