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// SPDX-License-Identifier: GPL-2.0-only
#include "error.h"
#include "misc.h"
bool init_unaccepted_memory(void)
{
guid_t guid = LINUX_EFI_UNACCEPTED_MEM_TABLE_GUID;
struct efi_unaccepted_memory *table;
unsigned long cfg_table_pa;
unsigned int cfg_table_len;
enum efi_type et;
int ret;
et = efi_get_type(boot_params_ptr);
if (et == EFI_TYPE_NONE)
return false;
ret = efi_get_conf_table(boot_params_ptr, &cfg_table_pa, &cfg_table_len);
if (ret) {
warn("EFI config table not found.");
return false;
}
table = (void *)efi_find_vendor_table(boot_params_ptr, cfg_table_pa,
cfg_table_len, guid);
if (!table)
return false;
if (table->version != 1)
error("Unknown version of unaccepted memory table\n");
/*
* In many cases unaccepted_table is already set by EFI stub, but it
* has to be initialized again to cover cases when the table is not
* allocated by EFI stub or EFI stub copied the kernel image with
* efi_relocate_kernel() before the variable is set.
*
* It must be initialized before the first usage of accept_memory().
*/
unaccepted_table = table;
return true;
}
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