mirror of
https://github.com/AsahiLinux/u-boot
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971ccee2fb
KASLR address is needed to boot fully functional Android. KASLR is set by primary bootloader, and since u-boot is used as a secondary bootloader(replacing kernel) on sdm845 platform, KASLR may be found by comparing memory chunks at relocaddr over supposed KASLR range. Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com> Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Common init part for boards based on SDM845
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*
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* (C) Copyright 2021 Dzmitry Sankouski <dsankouski@gmail.com>
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*/
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#include <init.h>
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#include <env.h>
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#include <common.h>
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#include <asm/system.h>
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#include <asm/gpio.h>
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#include <dm.h>
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DECLARE_GLOBAL_DATA_PTR;
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int dram_init(void)
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{
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return fdtdec_setup_mem_size_base();
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}
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void reset_cpu(void)
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{
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psci_system_reset();
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}
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__weak int board_init(void)
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{
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return 0;
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}
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/* Check for vol- and power buttons */
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__weak int misc_init_r(void)
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{
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struct udevice *pon;
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struct gpio_desc resin;
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int node, ret;
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ret = uclass_get_device_by_name(UCLASS_GPIO, "pm8998_pon@800", &pon);
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if (ret < 0) {
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printf("Failed to find PMIC pon node. Check device tree\n");
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return 0;
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}
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node = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(pon),
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"key_vol_down");
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if (node < 0) {
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printf("Failed to find key_vol_down node. Check device tree\n");
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return 0;
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}
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if (gpio_request_by_name_nodev(offset_to_ofnode(node), "gpios", 0,
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&resin, 0)) {
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printf("Failed to request key_vol_down button.\n");
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return 0;
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}
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if (dm_gpio_get_value(&resin)) {
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env_set("key_vol_down", "1");
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printf("Volume down button pressed\n");
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} else {
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env_set("key_vol_down", "0");
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}
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node = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(pon),
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"key_power");
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if (node < 0) {
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printf("Failed to find key_power node. Check device tree\n");
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return 0;
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}
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if (gpio_request_by_name_nodev(offset_to_ofnode(node), "gpios", 0,
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&resin, 0)) {
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printf("Failed to request key_power button.\n");
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return 0;
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}
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if (dm_gpio_get_value(&resin)) {
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env_set("key_power", "1");
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printf("Power button pressed\n");
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} else {
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env_set("key_power", "0");
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}
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/*
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* search for kaslr address, set by primary bootloader by searching first
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* 0x100 relocated bytes at u-boot's initial load address range
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*/
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uintptr_t start = gd->ram_base;
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uintptr_t end = start + 0x800000;
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u8 *addr = (u8 *)start;
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phys_addr_t *relocaddr = (phys_addr_t *)gd->relocaddr;
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u32 block_size = 0x1000;
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while (memcmp(addr, relocaddr, 0x100) && (uintptr_t)addr < end)
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addr += block_size;
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if ((uintptr_t)addr >= end)
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printf("KASLR not found in range 0x%lx - 0x%lx", start, end);
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else
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env_set_addr("KASLR", addr);
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return 0;
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}
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