:: commit 528be7230f96059a31a57b1af69d31d2119e1eae
DTB: ensure the `dtb_ptr` is an HHDM address
* Ensure that the `dtb_ptr` is an HHDM address * If DTB is not found, do not generate the response Signed-off-by: Andy-Python-Programmer <andypythonappdeveloper@gmail.com>
diff --git a/PROTOCOL.md b/PROTOCOL.md
index 4e01d222..5b656cf2 100644
--- a/PROTOCOL.md
+++ b/PROTOCOL.md
@@ -1079,5 +1079,7 @@ struct limine_dtb_response {
* `dtb_ptr` - Virtual pointer to the device tree blob.
+Note: If the DTB cannot be found, the response will *not* be generated.
+
Note: Information contained in the `/chosen` node may not reflect the information
given by bootloader tags, and as such the `/chosen` node properties should be ignored.
diff --git a/common/protos/limine.c b/common/protos/limine.c
index b36fc5a8..09ad76ea 100644
--- a/common/protos/limine.c
+++ b/common/protos/limine.c
@@ -540,9 +540,6 @@ FEAT_START
}
#if defined (UEFI)
- struct limine_dtb_response *dtb_response =
- ext_mem_alloc(sizeof(struct limine_dtb_response));
-
// TODO: Looking for the DTB should be moved out of here and into lib/, because:
// 1. We will need it for core bring-up for the SMP request.
// 2. We will need to patch it for the Linux boot protocol to set the initramfs
@@ -555,11 +552,15 @@ FEAT_START
for (size_t i = 0; i < gST->NumberOfTableEntries; i++) {
EFI_CONFIGURATION_TABLE *cur_table = &gST->ConfigurationTable[i];
- if (memcmp(&cur_table->VendorGuid, &dtb_guid, sizeof(EFI_GUID)) == 0)
- dtb_response->dtb_ptr = (uint64_t)(uintptr_t)cur_table->VendorTable;
+ if (memcmp(&cur_table->VendorGuid, &dtb_guid, sizeof(EFI_GUID)) == 0) {
+ struct limine_dtb_response *dtb_response =
+ ext_mem_alloc(sizeof(struct limine_dtb_response));
+ dtb_response->dtb_ptr = reported_addr((void *)cur_table->VendorTable);
+ dtb_request->response = reported_addr(dtb_response);
+ break;
+ }
}
- dtb_request->response = reported_addr(dtb_response);
#endif
FEAT_END
