61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
#include <efi.h>
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#include <efilib.h>
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#include <stddef.h>
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EFI_SYSTEM_TABLE * g_system_table;
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static void write_string(uint16_t * string)
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{
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g_system_table->ConOut->OutputString(g_system_table->ConOut, string);
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}
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static void write_uint(uint32_t n)
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{
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uint16_t s[12] = {0};
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size_t i = 0u;
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while ((n != 0u) || (i == 0u))
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{
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s[10u - i] = '0' + (n % 10u);
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n /= 10u;
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i++;
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}
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write_string(&s[11u - i]);
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}
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EFI_STATUS
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efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * system_table)
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{
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EFI_STATUS status;
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EFI_INPUT_KEY key;
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g_system_table = system_table;
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write_string(L"My first EFI loader\r\n");
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if (EFI_ERROR(status))
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return status;
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status = system_table->ConIn->Reset(system_table->ConIn, FALSE);
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if (EFI_ERROR(status))
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return status;
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EFI_HANDLE buffer[10];
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UINTN buffer_size = sizeof(buffer);
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status = system_table->BootServices->LocateHandle(ByProtocol,
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&(EFI_GUID)EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID,
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NULL,
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&buffer_size,
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buffer);
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write_string(L"status = ");
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write_uint(status);
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write_string(L", num entries = ");
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write_uint(buffer_size / sizeof(EFI_HANDLE));
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write_string(L"\r\n");
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write_string(L"Press any key...\r\n");
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while ((status = system_table->ConIn->ReadKeyStroke(system_table->ConIn, &key)) == EFI_NOT_READY)
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{
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}
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return status;
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}
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