ArmPkg/Library/BdsLib/BdsLinuxLoader.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2011-2012, ARM Limited. All rights reserved.
   4 *
   5 *  This program and the accompanying materials
   6 *  are licensed and made available under the terms and conditions of the BSD License
   7 *  which accompanies this distribution.  The full text of the license may be found at
   8 *  http://opensource.org/licenses/bsd-license.php
   9 *
  10 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 *
  13 **/
  14
  15 #include "BdsInternal.h"
  16 #include "BdsLinuxLoader.h"
  17
  18 #define ALIGN32_BELOW(addr)   ALIGN_POINTER(addr - 32,32)
  19
  20 STATIC
  21 EFI_STATUS
  22 PreparePlatformHardware (
  23   VOID
  24   )
  25 {
  26   //Note: Interrupts will be disabled by the GIC driver when ExitBootServices() will be called.
  27
  28   // Clean, invalidate, disable data cache
  29   ArmDisableDataCache();
  30   ArmCleanInvalidateDataCache();
  31
  32   // Invalidate and disable the Instruction cache
  33   ArmDisableInstructionCache ();
  34   ArmInvalidateInstructionCache ();
  35
  36   // Turn off MMU
  37   ArmDisableMmu();
  38
  39   return EFI_SUCCESS;
  40 }
  41
  42 STATIC
  43 EFI_STATUS
  44 StartLinux (
  45   IN  EFI_PHYSICAL_ADDRESS  LinuxImage,
  46   IN  UINTN                 LinuxImageSize,
  47   IN  EFI_PHYSICAL_ADDRESS  KernelParamsAddress,
  48   IN  UINTN                 KernelParamsSize,
  49   IN  UINT32                MachineType
  50   )
  51 {
  52   EFI_STATUS            Status;
  53   LINUX_KERNEL          LinuxKernel;
  54
  55   // Shut down UEFI boot services. ExitBootServices() will notify every driver that created an event on
  56   // ExitBootServices event. Example the Interrupt DXE driver will disable the interrupts on this event.
  57   Status = ShutdownUefiBootServices ();
  58   if(EFI_ERROR(Status)) {
  59     DEBUG((EFI_D_ERROR,"ERROR: Can not shutdown UEFI boot services. Status=0x%X\n", Status));
  60     goto Exit;
  61   }
  62
  63   // Move the kernel parameters to any address inside the first 1MB.
  64   // This is necessary because the ARM Linux kernel requires
  65   // the FTD / ATAG List to reside entirely inside the first 1MB of
  66   // physical memory.
  67   //Note: There is no requirement on the alignment
  68   if (MachineType != ARM_FDT_MACHINE_TYPE) {
  69     if (((UINTN)KernelParamsAddress > LINUX_ATAG_MAX_OFFSET) && (KernelParamsSize < PcdGet32(PcdArmLinuxAtagMaxOffset))) {
  70       KernelParamsAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)CopyMem (ALIGN32_BELOW(LINUX_ATAG_MAX_OFFSET - KernelParamsSize), (VOID*)(UINTN)KernelParamsAddress, KernelParamsSize);
  71     }
  72   } else {
  73     if (((UINTN)KernelParamsAddress > LINUX_FDT_MAX_OFFSET) && (KernelParamsSize < PcdGet32(PcdArmLinuxFdtMaxOffset))) {
  74       KernelParamsAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)CopyMem (ALIGN32_BELOW(LINUX_FDT_MAX_OFFSET - KernelParamsSize), (VOID*)(UINTN)KernelParamsAddress, KernelParamsSize);
  75     }
  76   }
  77
  78   if ((UINTN)LinuxImage > LINUX_KERNEL_MAX_OFFSET) {
  79     //Note: There is no requirement on the alignment
  80     LinuxKernel = (LINUX_KERNEL)CopyMem (ALIGN32_BELOW(LINUX_KERNEL_MAX_OFFSET - LinuxImageSize), (VOID*)(UINTN)LinuxImage, LinuxImageSize);
  81   } else {
  82     LinuxKernel = (LINUX_KERNEL)(UINTN)LinuxImage;
  83   }
  84
  85   // Check if the Linux Image is a uImage
  86   if (*(UINT32*)LinuxKernel == LINUX_UIMAGE_SIGNATURE) {
  87     // Assume the Image Entry Point is just after the uImage header (64-byte size)
  88     LinuxKernel = (LINUX_KERNEL)((UINTN)LinuxKernel + 64);
  89     LinuxImageSize -= 64;
  90   }
  91
  92   //TODO: Check there is no overlapping between kernel and Atag
  93
  94   //
  95   // Switch off interrupts, caches, mmu, etc
  96   //
  97   Status = PreparePlatformHardware ();
  98   ASSERT_EFI_ERROR(Status);
  99
 100   // Register and print out performance information
 101   PERF_END (NULL, "BDS", NULL, 0);
 102   if (PerformanceMeasurementEnabled ()) {
 103     PrintPerformance ();
 104   }
 105
 106   //
 107   // Start the Linux Kernel
 108   //
 109
 110   // Outside BootServices, so can't use Print();
 111   DEBUG((EFI_D_ERROR, "\nStarting the kernel:\n\n"));
 112
 113   // Jump to kernel with register set
 114   LinuxKernel ((UINTN)0, MachineType, (UINTN)KernelParamsAddress);
 115
 116   // Kernel should never exit
 117   // After Life services are not provided
 118   ASSERT(FALSE);
 119
 120 Exit:
 121   // Only be here if we fail to start Linux
 122   Print (L"ERROR  : Can not start the kernel. Status=0x%X\n", Status);
 123
 124   // Free Runtimee Memory (kernel and FDT)
 125   return Status;
 126 }
 127
 128 /**
 129   Start a Linux kernel from a Device Path
 130
 131   @param  LinuxKernel           Device Path to the Linux Kernel
 132   @param  Parameters            Linux kernel arguments
 133   @param  Fdt                   Device Path to the Flat Device Tree
 134
 135   @retval EFI_SUCCESS           All drivers have been connected
 136   @retval EFI_NOT_FOUND         The Linux kernel Device Path has not been found
 137   @retval EFI_OUT_OF_RESOURCES  There is not enough resource memory to store the matching results.
 138
 139 **/
 140 EFI_STATUS
 141 BdsBootLinuxAtag (
 142   IN  EFI_DEVICE_PATH_PROTOCOL* LinuxKernelDevicePath,
 143   IN  EFI_DEVICE_PATH_PROTOCOL* InitrdDevicePath,
 144   IN  CONST CHAR8*              CommandLineArguments
 145   )
 146 {
 147   EFI_STATUS            Status;
 148   UINT32                LinuxImageSize;
 149   UINT32                InitrdImageSize = 0;
 150   UINT32                AtagSize;
 151   EFI_PHYSICAL_ADDRESS  AtagBase;
 152   EFI_PHYSICAL_ADDRESS  LinuxImage;
 153   EFI_PHYSICAL_ADDRESS  InitrdImage;
 154
 155   PERF_START (NULL, "BDS", NULL, 0);
 156
 157   // Load the Linux kernel from a device path
 158   LinuxImage = LINUX_KERNEL_MAX_OFFSET;
 159   Status = BdsLoadImage (LinuxKernelDevicePath, AllocateMaxAddress, &LinuxImage, &LinuxImageSize);
 160   if (EFI_ERROR(Status)) {
 161     Print (L"ERROR: Did not find Linux kernel.\n");
 162     return Status;
 163   }
 164
 165   if (InitrdDevicePath) {
 166     // Load the initrd near to the Linux kernel
 167     InitrdImage = LINUX_KERNEL_MAX_OFFSET;
 168     Status = BdsLoadImage (InitrdDevicePath, AllocateMaxAddress, &InitrdImage, &InitrdImageSize);
 169     if (Status == EFI_OUT_OF_RESOURCES) {
 170       Status = BdsLoadImage (InitrdDevicePath, AllocateAnyPages, &InitrdImage, &InitrdImageSize);
 171     }
 172     if (EFI_ERROR(Status)) {
 173       Print (L"ERROR: Did not find initrd image.\n");
 174       return Status;
 175     }
 176
 177     // Check if the initrd is a uInitrd
 178     if (*(UINT32*)((UINTN)InitrdImage) == LINUX_UIMAGE_SIGNATURE) {
 179       // Skip the 64-byte image header
 180       InitrdImage = (EFI_PHYSICAL_ADDRESS)((UINTN)InitrdImage + 64);
 181       InitrdImageSize -= 64;
 182     }
 183   }
 184
 185   //
 186   // Setup the Linux Kernel Parameters
 187   //
 188
 189   // By setting address=0 we leave the memory allocation to the function
 190   Status = PrepareAtagList (CommandLineArguments, InitrdImage, InitrdImageSize, &AtagBase, &AtagSize);
 191   if (EFI_ERROR(Status)) {
 192     Print(L"ERROR: Can not prepare ATAG list. Status=0x%X\n", Status);
 193     return Status;
 194   }
 195
 196   return StartLinux (LinuxImage, LinuxImageSize, AtagBase, AtagSize, PcdGet32(PcdArmMachineType));
 197 }
 198
 199 /**
 200   Start a Linux kernel from a Device Path
 201
 202   @param  LinuxKernel           Device Path to the Linux Kernel
 203   @param  Parameters            Linux kernel arguments
 204   @param  Fdt                   Device Path to the Flat Device Tree
 205
 206   @retval EFI_SUCCESS           All drivers have been connected
 207   @retval EFI_NOT_FOUND         The Linux kernel Device Path has not been found
 208   @retval EFI_OUT_OF_RESOURCES  There is not enough resource memory to store the matching results.
 209
 210 **/
 211 EFI_STATUS
 212 BdsBootLinuxFdt (
 213   IN  EFI_DEVICE_PATH_PROTOCOL* LinuxKernelDevicePath,
 214   IN  EFI_DEVICE_PATH_PROTOCOL* InitrdDevicePath,
 215   IN  CONST CHAR8*              CommandLineArguments,
 216   IN  EFI_DEVICE_PATH_PROTOCOL* FdtDevicePath
 217   )
 218 {
 219   EFI_STATUS            Status;
 220   UINT32                LinuxImageSize;
 221   UINT32                InitrdImageSize = 0;
 222   UINT32                FdtBlobSize;
 223   EFI_PHYSICAL_ADDRESS  FdtBlobBase;
 224   EFI_PHYSICAL_ADDRESS  LinuxImage;
 225   EFI_PHYSICAL_ADDRESS  InitrdImage;
 226
 227   PERF_START (NULL, "BDS", NULL, 0);
 228
 229   // Load the Linux kernel from a device path
 230   LinuxImage = LINUX_KERNEL_MAX_OFFSET;
 231   Status = BdsLoadImage (LinuxKernelDevicePath, AllocateMaxAddress, &LinuxImage, &LinuxImageSize);
 232   if (EFI_ERROR(Status)) {
 233     Print (L"ERROR: Did not find Linux kernel.\n");
 234     return Status;
 235   }
 236
 237   if (InitrdDevicePath) {
 238     InitrdImage = LINUX_KERNEL_MAX_OFFSET;
 239     Status = BdsLoadImage (InitrdDevicePath, AllocateMaxAddress, &InitrdImage, &InitrdImageSize);
 240     if (Status == EFI_OUT_OF_RESOURCES) {
 241       Status = BdsLoadImage (InitrdDevicePath, AllocateAnyPages, &InitrdImage, &InitrdImageSize);
 242     }
 243     if (EFI_ERROR(Status)) {
 244       Print (L"ERROR: Did not find initrd image.\n");
 245       return Status;
 246     }
 247
 248     // Check if the initrd is a uInitrd
 249     if (*(UINT32*)((UINTN)InitrdImage) == LINUX_UIMAGE_SIGNATURE) {
 250       // Skip the 64-byte image header
 251       InitrdImage = (EFI_PHYSICAL_ADDRESS)((UINTN)InitrdImage + 64);
 252       InitrdImageSize -= 64;
 253     }
 254   }
 255
 256   // Load the FDT binary from a device path. The FDT will be reloaded later to a more appropriate location for the Linux kernel.
 257   FdtBlobBase = 0;
 258   Status = BdsLoadImage (FdtDevicePath, AllocateAnyPages, &FdtBlobBase, &FdtBlobSize);
 259   if (EFI_ERROR(Status)) {
 260     Print (L"ERROR: Did not find Device Tree blob.\n");
 261     return Status;
 262   }
 263
 264   // Update the Fdt with the Initrd information. The FDT will increase in size.
 265   // By setting address=0 we leave the memory allocation to the function
 266   Status = PrepareFdt (CommandLineArguments, InitrdImage, InitrdImageSize, &FdtBlobBase, &FdtBlobSize);
 267   if (EFI_ERROR(Status)) {
 268     Print(L"ERROR: Can not load kernel with FDT. Status=%r\n", Status);
 269     return Status;
 270   }
 271
 272   return StartLinux (LinuxImage, LinuxImageSize, FdtBlobBase, FdtBlobSize, ARM_FDT_MACHINE_TYPE);
 273 }
 274