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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <bootmem.h>
#include <program_loading.h>
#include <fit.h>
#include <symbols.h>
/**
* Place the region in free memory range.
*/
static bool fit_place_mem(const struct range_entry *r, void *arg)
{
struct region *region = arg;
resource_t start;
if (range_entry_tag(r) != BM_MEM_RAM)
return true;
/* Linux 4.15 doesn't like 4KiB alignment. Align to 1 MiB for now. */
start = ALIGN_UP(MAX(region->offset, range_entry_base(r)), 1 * MiB);
if (start + region->size < range_entry_end(r)) {
region->offset = (size_t)start;
return false;
}
return true;
}
bool fit_payload_arch(struct prog *payload, struct fit_config_node *config,
struct region *kernel,
struct region *fdt,
struct region *initrd)
{
void *arg = NULL;
/**
* The kernel ARM documentation recommends loading the kernel above 32MiB
* in order to avoid the need to need to relocate prior to decompression.
*/
kernel->offset = (uintptr_t)_dram + 32 * MiB;
/**
* The code assumes that bootmem_walk provides a sorted list of memory
* regions, starting from the lowest address.
* The order of the calls here doesn't matter, as the placement is
* enforced in the called functions.
* For details check code on top.
*/
if (!bootmem_walk(fit_place_mem, kernel))
return false;
/* Mark as reserved for future allocations. */
bootmem_add_range(kernel->offset, kernel->size, BM_MEM_PAYLOAD);
/**
* To ensure the fdt is not overwritten by the kernel decompressor, place
* the fdt above the 128 MB from the start of RAM, as recommended by the
* kernel documentation.
*/
fdt->offset = (uintptr_t)_dram + 128 * MiB;
if (!bootmem_walk(fit_place_mem, fdt))
return false;
/* Mark as reserved for future allocations. */
bootmem_add_range(fdt->offset, fdt->size, BM_MEM_PAYLOAD);
/* Place INITRD */
if (config->ramdisk) {
initrd->offset = fdt->offset + fdt->size;
if (!bootmem_walk(fit_place_mem, initrd))
return false;
/* Mark as reserved for future allocations. */
bootmem_add_range(initrd->offset, initrd->size, BM_MEM_PAYLOAD);
}
/* Kernel expects FDT as argument */
arg = (void *)fdt->offset;
prog_set_entry(payload, (void *)kernel->offset, arg);
bootmem_dump_ranges();
return true;
}
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