Add PCI driver

src/core/efi.h

@@ -1,11 +1,31 @@
 #ifndef EFI_H
 #define EFI_H
+
+#include <stdint.h>
+
 #define NULL ((void*)0)
 
-// EFI definitions
+// Basic Types
+typedef uint64_t UINT64;
+typedef uint32_t UINT32;
+typedef uint16_t UINT16;
+typedef uint8_t  UINT8;
+typedef uintptr_t UINTN;
+typedef intptr_t  INTN;
+typedef void     VOID;
+
 typedef uint64_t EFI_STATUS;
 typedef void* EFI_HANDLE;
+
 #define EFI_SUCCESS 0
+#define EFI_ERROR(status) (((INTN)(status)) < 0)
+
+typedef struct {
+    UINT32  Data1;
+    UINT16  Data2;
+    UINT16  Data3;
+    UINT8   Data4[8];
+} EFI_GUID;
 
 typedef struct {
     uint64_t signature;
@@ -15,6 +35,7 @@ typedef struct {
     uint32_t reserved;
 } EFI_TABLE_HEADER;
 
+// Simple Text Output Protocol
 struct EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL;
 typedef EFI_STATUS (*EFI_TEXT_STRING)(
     struct EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This,
@@ -38,6 +59,112 @@ typedef struct EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL {
     void *mode;
 } EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL;
 
+// Boot Services
+typedef struct {
+    EFI_TABLE_HEADER Hdr;
+    void *RaiseTPL;
+    void *RestoreTPL;
+    void *AllocatePages;
+    void *FreePages;
+    void *GetMemoryMap;
+    void *AllocatePool;
+    void *FreePool;
+    void *CreateEvent;
+    void *SetTimer;
+    void *WaitForEvent;
+    void *SignalEvent;
+    void *CloseEvent;
+    void *CheckEvent;
+    void *InstallProtocolInterface;
+    void *ReinstallProtocolInterface;
+    void *UninstallProtocolInterface;
+    void *HandleProtocol;
+    void *Reserved;
+    void *RegisterProtocolNotify;
+    void *LocateHandle;
+    void *LocateDevicePath;
+    void *InstallConfigurationTable;
+    void *LoadImage;
+    void *StartImage;
+    void *Exit;
+    void *UnloadImage;
+    void *ExitBootServices;
+    void *GetNextMonotonicCount;
+    void *Stall;
+    void *SetWatchdogTimer;
+    void *ConnectController;
+    void *DisconnectController;
+    void *OpenProtocol;
+    void *CloseProtocol;
+    void *OpenProtocolInformation;
+    void *ProtocolsPerHandle;
+    void *LocateHandleBuffer;
+    EFI_STATUS (*LocateProtocol)(EFI_GUID *Protocol, void *Registration, void **Interface);
+    void *InstallMultipleProtocolInterfaces;
+    void *UninstallMultipleProtocolInterfaces;
+    void *CalculateCrc32;
+    void *CopyMem;
+    void *SetMem;
+    void *CreateEventEx;
+} EFI_BOOT_SERVICES;
+
+// PCI Root Bridge IO Protocol
+#define EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_GUID \
+    { 0x2f707ebb, 0x4a1a, 0x11d4, {0x9a, 0x38, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d} }
+
+typedef enum {
+  EfiPciWidthUint8,
+  EfiPciWidthUint16,
+  EfiPciWidthUint32,
+  EfiPciWidthUint64,
+  EfiPciWidthFifoUint8,
+  EfiPciWidthFifoUint16,
+  EfiPciWidthFifoUint32,
+  EfiPciWidthFifoUint64,
+  EfiPciWidthFillUint8,
+  EfiPciWidthFillUint16,
+  EfiPciWidthFillUint32,
+  EfiPciWidthFillUint64,
+  EfiPciWidthMaximum
+} EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH;
+
+typedef struct _EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL;
+
+typedef
+EFI_STATUS
+(*EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_IO_MEM) (
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  *This,
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_WIDTH  Width,
+  UINT64                                 Address,
+  UINTN                                  Count,
+  VOID                                   *Buffer
+  );
+
+typedef struct {
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_IO_MEM  Read;
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_IO_MEM  Write;
+} EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS;
+
+struct _EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL {
+  void *ParentHandle;
+  void *PollMem;
+  void *PollIo;
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS Mem;
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS Io;
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_ACCESS Pci;
+  void *CopyMem;
+  void *Map;
+  void *Unmap;
+  void *AllocateBuffer;
+  void *FreeBuffer;
+  void *Flush;
+  void *GetAttributes;
+  void *SetAttributes;
+  void *Configuration;
+  UINT32 SegmentNumber;
+};
+
+// System Table
 typedef struct EFI_SYSTEM_TABLE {
     EFI_TABLE_HEADER hdr;
     uint16_t *firmwareVendor;
@@ -49,8 +176,9 @@ typedef struct EFI_SYSTEM_TABLE {
     void *standardErrorHandle;
     void *stdErr;
     void *runtimeServices;
-    void *bootServices;
+    EFI_BOOT_SERVICES *BootServices;
     uint64_t numberOfTableEntries;
     void *configurationTable;
 } EFI_SYSTEM_TABLE;
+
 #endif

src/core/main.c

@@ -99,14 +99,37 @@ JSValue jsKCClearScreen(JSContext *ctx, JSValueConst jsThis, int argc, JSValueCo
   return JS_UNDEFINED;
 }
 
+JSValue jsKCPCIReadDword(JSContext *ctx, JSValueConst jsThis, int argc, JSValueConst *argv) {
+  if (argc < 1) return JS_ThrowSyntaxError(ctx, "Missing argument");
+
+  uint32_t addr_u32;
+  JS_ToUint32(ctx, &addr_u32, argv[0]);
+  UINT64 addr = (UINT64)addr_u32; // Ensure type matches EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_RW's Address parameter
+
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL* pci;
+  EFI_GUID pciGuid = EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_GUID;
+  EFI_STATUS status = gST->BootServices->LocateProtocol(&pciGuid, NULL, (void**)&pci);
+
+  if (EFI_ERROR(status)) {
+    return JS_ThrowInternalError(ctx, "Failed to locate PCI Root Bridge IO Protocol: %d", status);
+  }
+
+  UINT32 data = 0;
+
+  status = pci->Pci.Read(pci, EfiPciWidthUint32, addr, 1, &data);
+
+  return JS_NewUint32(ctx, data);
+}
+
 void initKC(JSContext *ctx) {
   JSValue global = JS_GetGlobalObject(ctx);
   JSValue kc = JS_NewObject(ctx);
 
   JS_SetPropertyStr(ctx, global, "kc", kc);
-  
+
   JS_SetPropertyStr(ctx, kc, "println", JS_NewCFunction(ctx, jsKCPrintln, "println", 1));
   JS_SetPropertyStr(ctx, kc, "clearScreen", JS_NewCFunction(ctx, jsKCClearScreen, "clearScreen", 0));
+  JS_SetPropertyStr(ctx, kc, "pciReadDword", JS_NewCFunction(ctx, jsKCPCIReadDword, "pciReadDword", 1));
 
   JS_FreeValue(ctx, global);
 }