setos

commit 82bbf229d8b6d057d4f05975d2e91e721377ce6c
parent 632937475fcc4fa80c4d5d364d87ab3c59756243
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Thu, 21 Mar 2024 07:57:38 +0900

open root directory

Diffstat:
M
loader.c
 | 
19
+++++++++++++++++--
M
uefi.h
 | 
33
++++++++++++++++++++++++++++++---

2 files changed, 47 insertions(+), 5 deletions(-)
diff --git a/loader.c b/loader.c
@@ -3,6 +3,8 @@
 
 #define NULL 0L
 
+EFI_STATUS open_root(EFI_HANDLE, EFI_FILE_PROTOCOL **);
+
 EFI_SYSTEM_TABLE *SystemTable;
 
 EFI_STATUS
@@ -40,6 +42,10 @@ EfiMain(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *systab)
 			mmap->PhysicalStart, mmap->NumberOfPages, mmap->Attribute);
 	}
 
+	EFI_FILE_PROTOCOL *root;
+	stat = open_root(ImageHandle, &root);
+	efi_printf("open_root: %d\n", stat);
+
 	// Echo back user input.
 	EFI_INPUT_KEY Key;
 	CHAR16 str[2] = {' ', '\0'};
@@ -56,11 +62,20 @@ EFI_STATUS
 open_root(EFI_HANDLE ImageHandle, EFI_FILE_PROTOCOL **root)
 {
 	EFI_STATUS stat;
+	EFI_LOADED_IMAGE_PROTOCOL *li;
 	EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *fs;
 
 	stat = SystemTable->BootServices->OpenProtocol(
-		ImageHandle, &EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID,
-		NULL, ImageHandle, ImageHandle, 0
+		ImageHandle, &EFI_LOADED_IMAGE_PROTOCOL_GUID,
+		(VOID **) &li, ImageHandle, NULL, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
+		);
+	if (stat != EFI_SUCCESS) {
+		return stat;
+	}
+
+	stat = SystemTable->BootServices->OpenProtocol(
+		li->DeviceHandle, &EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID,
+		(VOID **) &fs, ImageHandle, NULL, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
 		);
 
 	return stat;
diff --git a/uefi.h b/uefi.h
@@ -22,14 +22,20 @@ typedef struct EFI_GUID {
 	UINT8  Data4[8];
 } EFI_GUID;
 
+#define EFI_LOADED_IMAGE_PROTOCOL_GUID \
+	((EFI_GUID) {0x5b1b31a1, 0x9562, 0x11d2, \
+		{0x8e, 0x3f, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b}})
 #define EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID \
-	((EFI_GUID) {0x964e5b22, 0x6459, 0x11d2, {0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b}})
+	((EFI_GUID) {0x964e5b22, 0x6459, 0x11d2, \
+		{0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b}})
 
 // EFI_STATUS
 enum {
 	EFI_SUCCESS = 0,
 };
 
+typedef struct _EFI_SYSTEM_TABLE EFI_SYSTEM_TABLE;
+
 typedef struct {
 	UINT16 ScanCode;
 	CHAR16 UnicodeChar;
@@ -141,6 +147,25 @@ struct _EFI_FILE_PROTOCOL {
 	void *dummy[9];
 };
 
+typedef struct _EFI_LOADED_IMAGE_PROTOCOL EFI_LOADED_IMAGE_PROTOCOL;
+
+struct _EFI_LOADED_IMAGE_PROTOCOL{
+	UINT32           Revision;
+	EFI_HANDLE       ParentHandle;
+	EFI_SYSTEM_TABLE *SystemTable;
+
+	EFI_HANDLE       DeviceHandle;
+	void             *dummy[2];
+
+	UINT32           LoadOptionSize;
+	VOID             *LoadOptions;
+
+	VOID             *ImageBase;
+	UINT64           ImageSize;
+	char             dummy1[4 + 4];
+	void             *dummy2;
+};
+
 typedef struct _EFI_SIMPLE_FILE_SYSTEM_PROTOCOL EFI_SIMPLE_FILE_SYSTEM_PROTOCOL;
 
 typedef
@@ -177,6 +202,8 @@ EFI_STATUS (EFIAPI *EFI_OPEN_PROTOCOL)(
 	IN UINT32     Attributes
 	);
 
+#define EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL 0x1
+
 typedef struct {
 } EFI_RUNTIME_SERVICES;
 
@@ -212,7 +239,7 @@ typedef struct {
 	void *miscellaneus_services1[3];
 } EFI_BOOT_SERVICES;
 
-typedef struct {
+struct _EFI_SYSTEM_TABLE {
 	EFI_TABLE_HEADER Hdr;
 	CHAR16 *FirmwareVendor;
 	char dummy1[4];
@@ -225,4 +252,4 @@ typedef struct {
 	EFI_RUNTIME_SERVICES *RuntimeServices;
 	EFI_BOOT_SERVICES *BootServices;
 	char dummy2[16];
-} EFI_SYSTEM_TABLE;
+};