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// SPDX-License-Identifier: GPL-2.0+
/*
* save_prev_bl_data - saving previous bootloader data
* to environment variables.
*
* Copyright (c) 2022 Dzmitry Sankouski (dsankouski@gmail.com)
*/
#include <init.h>
#include <env.h>
#include <fdtdec.h>
#include <fdt_support.h>
#include <fdt.h>
#include <common.h>
#include <linux/errno.h>
#include <asm/system.h>
#include <asm/armv8/mmu.h>
static ulong reg0 __section(".data");
/**
* Save x0 register value, assuming previous bootloader set it to
* point on loaded fdt or (for older linux kernels)atags.
*/
void save_boot_params(ulong r0)
{
reg0 = r0;
save_boot_params_ret();
}
bool is_addr_accessible(phys_addr_t addr)
{
struct mm_region *mem = mem_map;
phys_addr_t bank_start;
phys_addr_t bank_end;
while (mem->size) {
bank_start = mem->phys;
bank_end = bank_start + mem->size;
debug("check if block %pap - %pap includes %pap\n", &bank_start, &bank_end, &addr);
if (addr > bank_start && addr < bank_end)
return true;
mem++;
}
return false;
}
int save_prev_bl_data(void)
{
struct fdt_header *fdt_blob;
int node;
u64 initrd_start_prop;
if (!is_addr_accessible((phys_addr_t)reg0))
return -ENODATA;
fdt_blob = (struct fdt_header *)reg0;
if (!fdt_valid(&fdt_blob)) {
pr_warn("%s: address 0x%lx is not a valid fdt\n", __func__, reg0);
return -ENODATA;
}
if (IS_ENABLED(CONFIG_SAVE_PREV_BL_FDT_ADDR))
env_set_addr("prevbl_fdt_addr", (void *)reg0);
if (!IS_ENABLED(CONFIG_SAVE_PREV_BL_INITRAMFS_START_ADDR))
return 0;
node = fdt_path_offset(fdt_blob, "/chosen");
if (!node) {
pr_warn("%s: chosen node not found in device tree at addr: 0x%lx\n",
__func__, reg0);
return -ENODATA;
}
/*
* linux,initrd-start property might be either 64 or 32 bit,
* depending on primary bootloader implementation.
*/
initrd_start_prop = fdtdec_get_uint64(fdt_blob, node, "linux,initrd-start", 0);
if (!initrd_start_prop) {
debug("%s: attempt to get uint64 linux,initrd-start property failed, trying uint\n",
__func__);
initrd_start_prop = fdtdec_get_uint(fdt_blob, node, "linux,initrd-start", 0);
if (!initrd_start_prop) {
debug("%s: attempt to get uint failed, too\n", __func__);
return -ENODATA;
}
}
env_set_addr("prevbl_initrd_start_addr", (void *)initrd_start_prop);
return 0;
}
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