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Add logic to retry ExitBootServices() until success #9

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Merged
FlyGoat merged 1 commit into from
May 17, 2025
Merged

Add logic to retry ExitBootServices() until success #9

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14 changes: 13 additions & 1 deletion src/csmwrap.c
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Original file line number Diff line number Diff line change
Expand Up @@ -201,7 +201,19 @@ EFI_STATUS efi_main(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
efi_mmap_size += 4096;
BS->AllocatePool(EfiLoaderData, efi_mmap_size, (void **)&efi_mmap);
BS->GetMemoryMap(&efi_mmap_size, efi_mmap, &efi_mmap_key, &efi_desc_size, &efi_desc_ver);
BS->ExitBootServices(ImageHandle, efi_mmap_key);

// It may take N amounts of ExitBootServices() calls to complete...
// Cap at 128.
for (size_t i = 0; i < 128; i++) {
Status = BS->ExitBootServices(ImageHandle, efi_mmap_key);
if (Status == EFI_SUCCESS) {
break;
}
}
if (Status != EFI_SUCCESS) {
printf("Failed to exit boot services!");
return Status;
}

/* Disable external interrupts */
asm volatile ("cli");
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