josh/uefi-loader
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Print memory map

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This commit is contained in:
Josh Holtrop 2022-03-09 16:40:45 -05:00
parent dd406cf5b5
commit fdc5584110
1 changed files with 53 additions and 6 deletions
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59
main.c
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@ -22,14 +22,14 @@ static void write_uint(uint32_t n)
write_string(&s[11u - i]);
}
static void write_ptr(size_t n)
static void write_hex64(size_t n)
{
CHAR16 hexchars[] = L"0123456789ABCDEF";
CHAR16 s[20] = {0};
size_t s_i = 0u;
for (size_t i = 0u; i < 16u; i++)
{
if ((i != 0u) && ((i % 4u) == 0u))
if (i == 8u)
{
s[s_i++] = L'_';
}
@ -38,7 +38,7 @@ static void write_ptr(size_t n)
write_string(s);
}
static void check_handle(EFI_HANDLE handle)
static void check_gop_handle(EFI_HANDLE handle)
{
EFI_HANDLE interface = NULL;
EFI_STATUS status = g_system_table->BootServices->HandleProtocol(handle,
@ -59,12 +59,57 @@ static void check_handle(EFI_HANDLE handle)
}
write_string(L"interface is at ");
write_ptr((size_t)interface);
write_hex64((size_t)interface);
write_string(L"\r\n");
EFI_GRAPHICS_OUTPUT_PROTOCOL * gop = (EFI_GRAPHICS_OUTPUT_PROTOCOL *)interface;
}
static void dump_memory_map(void)
{
static uint8_t memory_map_buffer[16384];
UINTN memory_map_size = sizeof(memory_map_buffer);
UINTN map_key;
UINTN descriptor_size;
UINT32 descriptor_version;
EFI_STATUS status = g_system_table->BootServices->GetMemoryMap(&memory_map_size,
memory_map_buffer,
&map_key,
&descriptor_size,
&descriptor_version);
write_string(L"GetMemoryMap status = ");
write_uint(status);
write_string(L"\r\n");
write_string(L" memory_map_size = ");
write_uint(memory_map_size);
write_string(L"\r\n");
if (!EFI_ERROR(status))
{
write_string(L" descriptor_size = ");
write_uint(descriptor_size);
write_string(L"\r\n");
size_t n_descriptors = memory_map_size / descriptor_size;
for (size_t i = 0u; i < n_descriptors; i++)
{
EFI_MEMORY_DESCRIPTOR * descriptor = (EFI_MEMORY_DESCRIPTOR *)&memory_map_buffer[i * descriptor_size];
if (descriptor->Type == EfiConventionalMemory)
{
write_string(L" ");
write_hex64(descriptor->PhysicalStart);
write_string(L" : ");
write_hex64(descriptor->VirtualStart);
write_string(L", n=");
write_uint(descriptor->NumberOfPages);
write_string(L", t=");
write_uint(descriptor->Type);
write_string(L", a=");
write_hex64(descriptor->Attribute);
write_string(L"\r\n");
}
}
}
}
EFI_STATUS
efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * system_table)
{
@ -80,9 +125,11 @@ efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * system_table)
return status;
write_string(L"system_table is at ");
write_ptr((size_t)system_table);
write_hex64((size_t)system_table);
write_string(L"\r\n");
dump_memory_map();
EFI_HANDLE buffer[10];
UINTN buffer_size = sizeof(buffer);
status = system_table->BootServices->LocateHandle(ByProtocol,
@ -99,7 +146,7 @@ efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * system_table)
for (size_t i = 0u; i < buffer_size; i++)
{
check_handle(buffer[i]);
check_gop_handle(buffer[i]);
}
write_string(L"Press any key...\r\n");