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audk/ArmPkg/Application/LinuxLoader/Arm/LinuxStarter.c

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/** @file
*
* Copyright (c) 2011-2015, 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 <Library/ArmLib.h>
#include <Library/PcdLib.h>
#include <Guid/Fdt.h>
#include "LinuxLoader.h"
#define ALIGN32_BELOW(addr) ALIGN_POINTER(addr - 32,32)
#define IS_ADDRESS_IN_REGION(RegionStart, RegionSize, Address) \
(((UINTN)(RegionStart) <= (UINTN)(Address)) && ((UINTN)(Address) <= ((UINTN)(RegionStart) + (UINTN)(RegionSize))))
EFI_STATUS
PrepareAtagList (
IN EFI_PHYSICAL_ADDRESS SystemMemoryBase,
IN CONST CHAR8* CommandLineString,
IN EFI_PHYSICAL_ADDRESS InitrdImage,
IN UINTN InitrdImageSize,
OUT EFI_PHYSICAL_ADDRESS *AtagBase,
OUT UINT32 *AtagSize
);
STATIC
VOID
PreparePlatformHardware (
VOID
)
{
//Note: Interrupts will be disabled by the GIC driver when ExitBootServices() will be called.
// Clean before Disable else the Stack gets corrupted with old data.
ArmCleanDataCache ();
ArmDisableDataCache ();
// Invalidate all the entries that might have snuck in.
ArmInvalidateDataCache ();
// Invalidate and disable the Instruction cache
ArmDisableInstructionCache ();
ArmInvalidateInstructionCache ();
// Turn off MMU
ArmDisableMmu ();
}
STATIC
EFI_STATUS
StartLinux (
IN EFI_PHYSICAL_ADDRESS SystemMemoryBase,
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));
return Status;
}
// 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.
//Note: There is no requirement on the alignment
if (MachineType != ARM_FDT_MACHINE_TYPE) {
if (((UINTN)KernelParamsAddress > LINUX_ATAG_MAX_OFFSET) && (KernelParamsSize < PcdGet32 (PcdArmLinuxAtagMaxOffset))) {
KernelParamsAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)CopyMem (ALIGN32_BELOW (LINUX_ATAG_MAX_OFFSET - KernelParamsSize), (VOID*)(UINTN)KernelParamsAddress, KernelParamsSize);
}
} else {
if (((UINTN)KernelParamsAddress > LINUX_FDT_MAX_OFFSET) && (KernelParamsSize < PcdGet32 (PcdArmLinuxFdtMaxOffset))) {
KernelParamsAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)CopyMem (ALIGN32_BELOW (LINUX_FDT_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);
LinuxImageSize -= 64;
}
// Check there is no overlapping between kernel and its parameters
// We can only assert because it is too late to fallback to UEFI (ExitBootServices has been called).
ASSERT (!IS_ADDRESS_IN_REGION (LinuxKernel, LinuxImageSize, KernelParamsAddress) &&
!IS_ADDRESS_IN_REGION (LinuxKernel, LinuxImageSize, KernelParamsAddress + KernelParamsSize));
//
// Switch off interrupts, caches, mmu, etc
//
PreparePlatformHardware ();
// 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);
// We cannot recover the execution at this stage
while (1);
}
/**
Start a Linux kernel from a Device Path
@param SystemMemoryBase Base of the system memory
@param LinuxKernel Device Path to the Linux Kernel
@param Parameters Linux kernel arguments
@param Fdt Device Path to the Flat Device Tree
@param MachineType ARM machine type value
@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.
@retval RETURN_UNSUPPORTED ATAG is not support by this architecture
**/
EFI_STATUS
BootLinuxAtag (
IN EFI_PHYSICAL_ADDRESS SystemMemoryBase,
IN EFI_DEVICE_PATH_PROTOCOL* LinuxKernelDevicePath,
IN EFI_DEVICE_PATH_PROTOCOL* InitrdDevicePath,
IN CONST CHAR8* CommandLineArguments,
IN UINTN MachineType
)
{
EFI_STATUS Status;
UINT32 LinuxImageSize;
UINT32 InitrdImageBaseSize = 0;
UINT32 InitrdImageSize = 0;
UINT32 AtagSize;
EFI_PHYSICAL_ADDRESS AtagBase;
EFI_PHYSICAL_ADDRESS LinuxImage;
EFI_PHYSICAL_ADDRESS InitrdImageBase = 0;
EFI_PHYSICAL_ADDRESS InitrdImage = 0;
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) {
// Load the initrd near to the Linux kernel
InitrdImageBase = LINUX_KERNEL_MAX_OFFSET;
Status = BdsLoadImage (InitrdDevicePath, AllocateMaxAddress, &InitrdImageBase, &InitrdImageBaseSize);
if (Status == EFI_OUT_OF_RESOURCES) {
Status = BdsLoadImage (InitrdDevicePath, AllocateAnyPages, &InitrdImageBase, &InitrdImageBaseSize);
}
if (EFI_ERROR (Status)) {
Print (L"ERROR: Did not find initrd image.\n");
goto EXIT_FREE_LINUX;
}
// Check if the initrd is a uInitrd
if (*(UINT32*)((UINTN)InitrdImageBase) == LINUX_UIMAGE_SIGNATURE) {
// Skip the 64-byte image header
InitrdImage = (EFI_PHYSICAL_ADDRESS)((UINTN)InitrdImageBase + 64);
InitrdImageSize = InitrdImageBaseSize - 64;
} else {
InitrdImage = InitrdImageBase;
InitrdImageSize = InitrdImageBaseSize;
}
}
//
// Setup the Linux Kernel Parameters
//
// By setting address=0 we leave the memory allocation to the function
Status = PrepareAtagList (SystemMemoryBase, CommandLineArguments, InitrdImage, InitrdImageSize, &AtagBase, &AtagSize);
if (EFI_ERROR (Status)) {
Print (L"ERROR: Can not prepare ATAG list. Status=0x%X\n", Status);
goto EXIT_FREE_INITRD;
}
return StartLinux (SystemMemoryBase, LinuxImage, LinuxImageSize, AtagBase, AtagSize, MachineType);
EXIT_FREE_INITRD:
if (InitrdDevicePath) {
gBS->FreePages (InitrdImageBase, EFI_SIZE_TO_PAGES (InitrdImageBaseSize));
}
EXIT_FREE_LINUX:
gBS->FreePages (LinuxImage, EFI_SIZE_TO_PAGES (LinuxImageSize));
return Status;
}
/**
Start a Linux kernel from a Device Path
@param LinuxKernelDevicePath Device Path to the Linux Kernel
@param InitrdDevicePath Device Path to the Initrd
@param CommandLineArguments Linux command line
@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
BootLinuxFdt (
IN EFI_PHYSICAL_ADDRESS SystemMemoryBase,
IN EFI_DEVICE_PATH_PROTOCOL* LinuxKernelDevicePath,
IN EFI_DEVICE_PATH_PROTOCOL* InitrdDevicePath,
IN EFI_DEVICE_PATH_PROTOCOL* FdtDevicePath,
IN CONST CHAR8* CommandLineArguments
)
{
EFI_STATUS Status;
UINT32 LinuxImageSize;
UINT32 InitrdImageBaseSize = 0;
UINT32 InitrdImageSize = 0;
VOID *InstalledFdtBase;
UINT32 FdtBlobSize;
EFI_PHYSICAL_ADDRESS FdtBlobBase;
EFI_PHYSICAL_ADDRESS LinuxImage;
EFI_PHYSICAL_ADDRESS InitrdImageBase = 0;
EFI_PHYSICAL_ADDRESS InitrdImage = 0;
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) {
InitrdImageBase = LINUX_KERNEL_MAX_OFFSET;
Status = BdsLoadImage (InitrdDevicePath, AllocateMaxAddress, &InitrdImageBase, &InitrdImageBaseSize);
if (Status == EFI_OUT_OF_RESOURCES) {
Status = BdsLoadImage (InitrdDevicePath, AllocateAnyPages, &InitrdImageBase, &InitrdImageBaseSize);
}
if (EFI_ERROR (Status)) {
Print (L"ERROR: Did not find initrd image.\n");
goto EXIT_FREE_LINUX;
}
// Check if the initrd is a uInitrd
if (*(UINT32*)((UINTN)InitrdImageBase) == LINUX_UIMAGE_SIGNATURE) {
// Skip the 64-byte image header
InitrdImage = (EFI_PHYSICAL_ADDRESS)((UINTN)InitrdImageBase + 64);
InitrdImageSize = InitrdImageBaseSize - 64;
} else {
InitrdImage = InitrdImageBase;
InitrdImageSize = InitrdImageBaseSize;
}
}
if (FdtDevicePath == NULL) {
//
// Get the FDT from the Configuration Table.
// The FDT will be reloaded in PrepareFdt() to a more appropriate
// location for the Linux Kernel.
//
Status = EfiGetSystemConfigurationTable (&gFdtTableGuid, &InstalledFdtBase);
if (EFI_ERROR (Status)) {
Print (L"ERROR: Did not get the Device Tree blob (%r).\n", Status);
goto EXIT_FREE_INITRD;
}
FdtBlobBase = (EFI_PHYSICAL_ADDRESS)(UINTN)InstalledFdtBase;
FdtBlobSize = fdt_totalsize (InstalledFdtBase);
} else {
//
// FDT device path explicitly defined. The FDT is relocated later to a
// more appropriate location for the Linux kernel.
//
FdtBlobBase = LINUX_KERNEL_MAX_OFFSET;
Status = BdsLoadImage (FdtDevicePath, AllocateMaxAddress, &FdtBlobBase, &FdtBlobSize);
if (EFI_ERROR (Status)) {
Print (L"ERROR: Did not find Device Tree blob (%r).\n", Status);
goto EXIT_FREE_INITRD;
}
}
// Update the Fdt with the Initrd information. The FDT will increase in size.
// By setting address=0 we leave the memory allocation to the function
Status = PrepareFdt (SystemMemoryBase, CommandLineArguments, InitrdImage, InitrdImageSize, &FdtBlobBase, &FdtBlobSize);
if (EFI_ERROR (Status)) {
Print (L"ERROR: Can not load kernel with FDT. Status=%r\n", Status);
goto EXIT_FREE_FDT;
}
return StartLinux (SystemMemoryBase, LinuxImage, LinuxImageSize, FdtBlobBase, FdtBlobSize, ARM_FDT_MACHINE_TYPE);
EXIT_FREE_FDT:
gBS->FreePages (FdtBlobBase, EFI_SIZE_TO_PAGES (FdtBlobSize));
EXIT_FREE_INITRD:
if (InitrdDevicePath) {
gBS->FreePages (InitrdImageBase, EFI_SIZE_TO_PAGES (InitrdImageBaseSize));
}
EXIT_FREE_LINUX:
gBS->FreePages (LinuxImage, EFI_SIZE_TO_PAGES (LinuxImageSize));
return Status;
}
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