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/** @file
*
* Copyright (c) 2011-2012, ARM Limited. All rights reserved.
*
* This program and the accompanying materials
* are licensed and made available under the terms and conditions of the BSD License
* which accompanies this distribution. The full text of the license may be found at
* http://opensource.org/licenses/bsd-license.php
*
* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
*
**/
#include "BdsInternal.h"
#define ALIGN32_BELOW(addr) ALIGN_POINTER(addr - 32,32)
STATIC
EFI_STATUS
PreparePlatformHardware (
VOID
)
{
//Note: Interrupts will be disabled by the GIC driver when ExitBootServices() will be called.
// Clean, invalidate, disable data cache
ArmCleanInvalidateDataCache();
ArmDisableDataCache();
// Invalidate and disable the Instruction cache
ArmInvalidateInstructionCache ();
ArmDisableInstructionCache ();
// Turn off MMU
ArmDisableMmu();
return EFI_SUCCESS;
}
STATIC
EFI_STATUS
StartLinux (
IN EFI_PHYSICAL_ADDRESS LinuxImage,
IN UINTN LinuxImageSize,
IN EFI_PHYSICAL_ADDRESS KernelParamsAddress,
IN UINTN KernelParamsSize,
IN UINT32 MachineType
)
{
EFI_STATUS Status;
LINUX_KERNEL LinuxKernel;
// Shut down UEFI boot services. ExitBootServices() will notify every driver that created an event on
// ExitBootServices event. Example the Interrupt DXE driver will disable the interrupts on this event.
Status = ShutdownUefiBootServices ();
if(EFI_ERROR(Status)) {
DEBUG((EFI_D_ERROR,"ERROR: Can not shutdown UEFI boot services. Status=0x%X\n", Status));
goto Exit;
}
// Move the kernel parameters to any address inside the first 1MB.
// This is necessary because the ARM Linux kernel requires
// the FTD / ATAG List to reside entirely inside the first 1MB of
// physical memory.
if ((UINTN)KernelParamsAddress > LINUX_ATAG_MAX_OFFSET) {
//Note: There is no requirement on the alignment
KernelParamsAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)CopyMem (ALIGN32_BELOW(LINUX_ATAG_MAX_OFFSET - KernelParamsSize), (VOID*)(UINTN)KernelParamsAddress, KernelParamsSize);
}
if ((UINTN)LinuxImage > LINUX_KERNEL_MAX_OFFSET) {
//Note: There is no requirement on the alignment
LinuxKernel = (LINUX_KERNEL)CopyMem (ALIGN32_BELOW(LINUX_KERNEL_MAX_OFFSET - LinuxImageSize), (VOID*)(UINTN)LinuxImage, LinuxImageSize);
} else {
LinuxKernel = (LINUX_KERNEL)(UINTN)LinuxImage;
}
// Check if the Linux Image is a uImage
if (*(UINT32*)LinuxKernel == LINUX_UIMAGE_SIGNATURE) {
// Assume the Image Entry Point is just after the uImage header (64-byte size)
LinuxKernel = (LINUX_KERNEL)((UINTN)LinuxKernel + 64);
}
//TODO: Check there is no overlapping between kernel and Atag
//
// Switch off interrupts, caches, mmu, etc
//
Status = PreparePlatformHardware ();
ASSERT_EFI_ERROR(Status);
// Register and print out performance information
PERF_END (NULL, "BDS", NULL, 0);
if (PerformanceMeasurementEnabled ()) {
PrintPerformance ();
}
//
// Start the Linux Kernel
//
// Outside BootServices, so can't use Print();
DEBUG((EFI_D_ERROR, "\nStarting the kernel:\n\n"));
// Jump to kernel with register set
LinuxKernel ((UINTN)0, MachineType, (UINTN)KernelParamsAddress);
// Kernel should never exit
// After Life services are not provided
ASSERT(FALSE);
Exit:
// Only be here if we fail to start Linux
Print (L"ERROR : Can not start the kernel. Status=0x%X\n", Status);
// Free Runtimee Memory (kernel and FDT)
return Status;
}
/**
Start a Linux kernel from a Device Path
@param LinuxKernel Device Path to the Linux Kernel
@param Parameters Linux kernel agruments
@param Fdt Device Path to the Flat Device Tree
@retval EFI_SUCCESS All drivers have been connected
@retval EFI_NOT_FOUND The Linux kernel Device Path has not been found
@retval EFI_OUT_OF_RESOURCES There is not enough resource memory to store the matching results.
**/
EFI_STATUS
BdsBootLinuxAtag (
IN EFI_DEVICE_PATH_PROTOCOL* LinuxKernelDevicePath,
IN EFI_DEVICE_PATH_PROTOCOL* InitrdDevicePath,
IN CONST CHAR8* Arguments
)
{
EFI_STATUS Status;
UINT32 LinuxImageSize;
UINT32 InitrdImageSize = 0;
UINT32 KernelParamsSize;
EFI_PHYSICAL_ADDRESS KernelParamsAddress;
EFI_PHYSICAL_ADDRESS LinuxImage;
EFI_PHYSICAL_ADDRESS InitrdImage;
PERF_START (NULL, "BDS", NULL, 0);
// Load the Linux kernel from a device path
LinuxImage = LINUX_KERNEL_MAX_OFFSET;
Status = BdsLoadImage (LinuxKernelDevicePath, AllocateMaxAddress, &LinuxImage, &LinuxImageSize);
if (EFI_ERROR(Status)) {
Print (L"ERROR: Did not find Linux kernel.\n");
return Status;
}
if (InitrdDevicePath) {
Status = BdsLoadImage (InitrdDevicePath, AllocateAnyPages, &InitrdImage, &InitrdImageSize);
if (EFI_ERROR(Status)) {
Print (L"ERROR: Did not find initrd image.\n");
return Status;
}
}
//
// Setup the Linux Kernel Parameters
//
// By setting address=0 we leave the memory allocation to the function
Status = PrepareAtagList (Arguments, InitrdImage, InitrdImageSize, &KernelParamsAddress, &KernelParamsSize);
if (EFI_ERROR(Status)) {
Print(L"ERROR: Can not prepare ATAG list. Status=0x%X\n", Status);
return Status;
}
return StartLinux (LinuxImage, LinuxImageSize, KernelParamsAddress, KernelParamsSize, PcdGet32(PcdArmMachineType));
}
/**
Start a Linux kernel from a Device Path
@param LinuxKernel Device Path to the Linux Kernel
@param Parameters Linux kernel agruments
@param Fdt Device Path to the Flat Device Tree
@retval EFI_SUCCESS All drivers have been connected
@retval EFI_NOT_FOUND The Linux kernel Device Path has not been found
@retval EFI_OUT_OF_RESOURCES There is not enough resource memory to store the matching results.
**/
EFI_STATUS
BdsBootLinuxFdt (
IN EFI_DEVICE_PATH_PROTOCOL* LinuxKernelDevicePath,
IN EFI_DEVICE_PATH_PROTOCOL* InitrdDevicePath,
IN CONST CHAR8* Arguments,
IN EFI_DEVICE_PATH_PROTOCOL* FdtDevicePath
)
{
EFI_STATUS Status;
UINT32 LinuxImageSize;
UINT32 InitrdImageSize = 0;
UINT32 KernelParamsSize;
EFI_PHYSICAL_ADDRESS KernelParamsAddress;
UINT32 FdtMachineType;
EFI_PHYSICAL_ADDRESS LinuxImage;
EFI_PHYSICAL_ADDRESS InitrdImage;
FdtMachineType = 0xFFFFFFFF;
PERF_START (NULL, "BDS", NULL, 0);
// Load the Linux kernel from a device path
LinuxImage = LINUX_KERNEL_MAX_OFFSET;
Status = BdsLoadImage (LinuxKernelDevicePath, AllocateMaxAddress, &LinuxImage, &LinuxImageSize);
if (EFI_ERROR(Status)) {
Print (L"ERROR: Did not find Linux kernel.\n");
return Status;
}
if (InitrdDevicePath) {
Status = BdsLoadImage (InitrdDevicePath, AllocateAnyPages, &InitrdImage, &InitrdImageSize);
if (EFI_ERROR(Status)) {
Print (L"ERROR: Did not find initrd image.\n");
return Status;
}
}
// Load the FDT binary from a device path
KernelParamsAddress = LINUX_ATAG_MAX_OFFSET;
Status = BdsLoadImage (FdtDevicePath, AllocateMaxAddress, &KernelParamsAddress, &KernelParamsSize);
if (EFI_ERROR(Status)) {
Print (L"ERROR: Did not find Device Tree blob.\n");
return Status;
}
return StartLinux (LinuxImage, LinuxImageSize, KernelParamsAddress, KernelParamsSize, FdtMachineType);
}
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