mirror of
https://github.com/AsahiLinux/u-boot
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32ba8952cb
For secure boot systems it is common to have a read-only U-Boot which starts the machine and jumps to a read-write U-Boot for actual booting the OS. This allows the read-write U-Boot to be upgraded without risk of permanently bricking the machine. In the event that the read-write U-Boot is corrupted, the read-only U-Boot can detect this with a checksum and boot into a recovery flow. To support this, add a way to detect when U-Boot is run from SPL as opposed to some other method, such as booted directly (no SPL) or started from another source (e.g. a primary U-Boot). This works by putting a special value in r0. For now we rely on board-specific code to actually check the register and set a flag. At some point this could be generalised, perhaps by using a spare register and passing a flag to _main and/or board_init_f(). This commit does not implement any feature, but merely provides the API for boards to implement. Signed-off-by: Simon Glass <sjg@chromium.org>
98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/*
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* (C) Copyright 2012
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* Texas Instruments, <www.ti.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _SPL_H_
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#define _SPL_H_
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/* Platform-specific defines */
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#include <linux/compiler.h>
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#include <asm/spl.h>
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/* Value in r0 indicates we booted from U-Boot */
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#define UBOOT_NOT_LOADED_FROM_SPL 0x13578642
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/* Boot type */
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#define MMCSD_MODE_UNDEFINED 0
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#define MMCSD_MODE_RAW 1
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#define MMCSD_MODE_FS 2
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#define MMCSD_MODE_EMMCBOOT 3
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struct spl_image_info {
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const char *name;
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u8 os;
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u32 load_addr;
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u32 entry_point;
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u32 size;
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u32 flags;
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};
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#define SPL_COPY_PAYLOAD_ONLY 1
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extern struct spl_image_info spl_image;
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/* SPL common functions */
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void preloader_console_init(void);
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u32 spl_boot_device(void);
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u32 spl_boot_mode(void);
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void spl_set_header_raw_uboot(void);
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void spl_parse_image_header(const struct image_header *header);
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void spl_board_prepare_for_linux(void);
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void __noreturn jump_to_image_linux(void *arg);
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int spl_start_uboot(void);
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void spl_display_print(void);
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/* NAND SPL functions */
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void spl_nand_load_image(void);
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/* OneNAND SPL functions */
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void spl_onenand_load_image(void);
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/* NOR SPL functions */
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void spl_nor_load_image(void);
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/* MMC SPL functions */
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void spl_mmc_load_image(void);
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/* YMODEM SPL functions */
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void spl_ymodem_load_image(void);
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/* SPI SPL functions */
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void spl_spi_load_image(void);
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/* Ethernet SPL functions */
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void spl_net_load_image(const char *device);
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/* USB SPL functions */
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void spl_usb_load_image(void);
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/* SATA SPL functions */
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void spl_sata_load_image(void);
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/* SPL FAT image functions */
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int spl_load_image_fat(block_dev_desc_t *block_dev, int partition, const char *filename);
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int spl_load_image_fat_os(block_dev_desc_t *block_dev, int partition);
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void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image);
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/* SPL EXT image functions */
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int spl_load_image_ext(block_dev_desc_t *block_dev, int partition, const char *filename);
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int spl_load_image_ext_os(block_dev_desc_t *block_dev, int partition);
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#ifdef CONFIG_SPL_BOARD_INIT
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void spl_board_init(void);
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#endif
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/**
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* spl_was_boot_source() - check if U-Boot booted from SPL
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*
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* This will normally be true, but if U-Boot jumps to second U-Boot, it will
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* be false. This should be implemented by board-specific code.
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*
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* @return true if U-Boot booted from SPL, else false
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*/
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bool spl_was_boot_source(void);
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#endif
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