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efi: stub: add known memory to U-Boot's EFI memory map

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When running U-Boot as an EFI payload with CONFIG_EFI_STUB, the reserved
regions from the previous stage EFI bootloader should be carried over
since they may not fully align with the reserved-memory regions in
devicetree.

Implement a helper to map these pages when the EFI subsystem starts up.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
This commit is contained in:
Caleb Connolly
2024-11-24 21:27:03 +01:00
committed by Simon Glass
parent 8cb8d63b43
commit de6dd73b4e
3 changed files with 43 additions and 0 deletions
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31
lib/efi/efi_info.c
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@@ -6,6 +6,7 @@
*/
#include <efi.h>
#include <efi_loader.h>
#include <efi_stub.h>
#include <errno.h>
#include <mapmem.h>
@@ -176,3 +177,33 @@ int dram_init_banksize_from_efi(void)
return 0;
}
/* Called by U-Boot's EFI subsystem to add known memory. In our case
* we need to add some specific memory types from the original bootloaders
* EFI memory map
*/
void efi_add_known_memory_from_efi(void)
{
struct efi_mem_desc *desc, *end;
struct efi_entry_memmap *map;
int ret, size;
EFI_PRINT("Adding known memory from previous stage EFI bootloader\n");
ret = efi_info_get(EFIET_MEMORY_MAP, (void **)&map, &size);
if (ret) {
EFI_PRINT("%s: Missing memory map\n", __func__);
return;
}
end = (struct efi_mem_desc *)((ulong)map + size);
for (desc = map->desc; desc < end; desc = efi_get_next_mem_desc(desc, map->desc_size)) {
switch (desc->type) {
case EFI_RESERVED_MEMORY_TYPE:
efi_add_memory_map_pg(desc->physical_start, desc->num_pages, desc->type, false);
break;
default:
continue;
}
}
}