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Loop through graphics output protocol handles and check each one

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This commit is contained in:
Josh Holtrop 2022-03-08 23:12:23 -05:00
parent 617f4de515
commit 1e7cd64f0f
1 changed files with 30 additions and 3 deletions
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33
main.c
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@ -22,6 +22,29 @@ static void write_uint(uint32_t n)
write_string(&s[11u - i]); write_string(&s[11u - i]);
} }
static void check_handle(EFI_HANDLE handle)
{
EFI_HANDLE interface = NULL;
EFI_STATUS status = g_system_table->BootServices->HandleProtocol(handle,
&(EFI_GUID)EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID,
&interface);
if (EFI_ERROR(status))
{
write_string(L"Error ");
write_uint(status);
write_string(L" from HandleProtocol\r\n");
return;
}
if (interface == NULL)
{
write_string(L"NULL interface from HandleProtocol\r\n");
return;
}
EFI_GRAPHICS_OUTPUT_PROTOCOL * gop = (EFI_GRAPHICS_OUTPUT_PROTOCOL *)interface;
}
EFI_STATUS EFI_STATUS
efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * system_table) efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * system_table)
{ {
@ -31,8 +54,6 @@ efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * system_table)
g_system_table = system_table; g_system_table = system_table;
write_string(L"My first EFI loader\r\n"); write_string(L"My first EFI loader\r\n");
if (EFI_ERROR(status))
return status;
status = system_table->ConIn->Reset(system_table->ConIn, FALSE); status = system_table->ConIn->Reset(system_table->ConIn, FALSE);
if (EFI_ERROR(status)) if (EFI_ERROR(status))
@ -45,12 +66,18 @@ efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * system_table)
NULL, NULL,
&buffer_size, &buffer_size,
buffer); buffer);
buffer_size /= sizeof(EFI_HANDLE);
write_string(L"status = "); write_string(L"status = ");
write_uint(status); write_uint(status);
write_string(L", num entries = "); write_string(L", num entries = ");
write_uint(buffer_size / sizeof(EFI_HANDLE)); write_uint(buffer_size);
write_string(L"\r\n"); write_string(L"\r\n");
for (size_t i = 0u; i < buffer_size; i++)
{
check_handle(buffer[i]);
}
write_string(L"Press any key...\r\n"); write_string(L"Press any key...\r\n");
while ((status = system_table->ConIn->ReadKeyStroke(system_table->ConIn, &key)) == EFI_NOT_READY) while ((status = system_table->ConIn->ReadKeyStroke(system_table->ConIn, &key)) == EFI_NOT_READY)
{ {