/** @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 <Library/PcdLib.h>
#include <libfdt.h>

#include "BdsInternal.h"
#include "BdsLinuxLoader.h"

#define ALIGN(x, a)     (((x) + ((a) - 1)) & ~((a) - 1))
#define PALIGN(p, a)    ((void *)(ALIGN((unsigned long)(p), (a))))
#define GET_CELL(p)     (p += 4, *((const UINT32 *)(p-4)))

STATIC
UINTN
IsPrintableString (
  IN CONST VOID* data,
  IN UINTN len
  )
{
  CONST CHAR8 *s = data;
  CONST CHAR8 *ss;

  // Zero length is not
  if (len == 0) {
    return 0;
  }

  // Must terminate with zero
  if (s[len - 1] != '\0') {
    return 0;
  }

  ss = s;
  while (*s/* && isprint(*s)*/) {
    s++;
  }

  // Not zero, or not done yet
  if (*s != '\0' || (s + 1 - ss) < len) {
    return 0;
  }

  return 1;
}

STATIC
VOID
PrintData (
  IN CONST CHAR8* data,
  IN UINTN len
  )
{
  UINTN i;
  CONST CHAR8 *p = data;

  // No data, don't print
  if (len == 0)
    return;

  if (IsPrintableString (data, len)) {
    Print(L" = \"%a\"", (const char *)data);
  } else if ((len % 4) == 0) {
    Print(L" = <");
    for (i = 0; i < len; i += 4) {
      Print(L"0x%08x%a", fdt32_to_cpu(GET_CELL(p)),i < (len - 4) ? " " : "");
    }
    Print(L">");
  } else {
    Print(L" = [");
    for (i = 0; i < len; i++)
      Print(L"%02x%a", *p++, i < len - 1 ? " " : "");
    Print(L"]");
  }
}

VOID
DebugDumpFdt (
  IN VOID*                FdtBlob
  )
{
  struct fdt_header *bph;
  UINT32 off_dt;
  UINT32 off_str;
  CONST CHAR8* p_struct;
  CONST CHAR8* p_strings;
  CONST CHAR8* p;
  CONST CHAR8* s;
  CONST CHAR8* t;
  UINT32 tag;
  UINTN sz;
  UINTN depth;
  UINTN shift;
  UINT32 version;

  depth = 0;
  shift = 4;

  bph = FdtBlob;
  off_dt = fdt32_to_cpu(bph->off_dt_struct);
  off_str = fdt32_to_cpu(bph->off_dt_strings);
  p_struct = (CONST CHAR8*)FdtBlob + off_dt;
  p_strings = (CONST CHAR8*)FdtBlob + off_str;
  version = fdt32_to_cpu(bph->version);

  p = p_struct;
  while ((tag = fdt32_to_cpu(GET_CELL(p))) != FDT_END) {
    if (tag == FDT_BEGIN_NODE) {
      s = p;
      p = PALIGN(p + AsciiStrLen (s) + 1, 4);

      if (*s == '\0')
              s = "/";

      Print(L"%*s%a {\n", depth * shift, L" ", s);

      depth++;
      continue;
    }

    if (tag == FDT_END_NODE) {
      depth--;

      Print(L"%*s};\n", depth * shift, L" ");
      continue;
    }

    if (tag == FDT_NOP) {
      Print(L"%*s// [NOP]\n", depth * shift, L" ");
      continue;
    }

    if (tag != FDT_PROP) {
      Print(L"%*s ** Unknown tag 0x%08x\n", depth * shift, L" ", tag);
      break;
    }
    sz = fdt32_to_cpu(GET_CELL(p));
    s = p_strings + fdt32_to_cpu(GET_CELL(p));
    if (version < 16 && sz >= 8)
            p = PALIGN(p, 8);
    t = p;

    p = PALIGN(p + sz, 4);

    Print(L"%*s%a", depth * shift, L" ", s);
    PrintData(t, sz);
    Print(L";\n");
  }
}

typedef struct {
  UINTN   Base;
  UINTN   Size;
} FdtRegion;

EFI_STATUS
PrepareFdt (
  IN     CONST CHAR8*         CommandLineArguments,
  IN     EFI_PHYSICAL_ADDRESS InitrdImage,
  IN     UINTN                InitrdImageSize,
  IN OUT EFI_PHYSICAL_ADDRESS *FdtBlobBase,
  IN OUT UINT32               *FdtBlobSize
  )
{
  EFI_STATUS            Status;
  EFI_PHYSICAL_ADDRESS  NewFdtBlobBase;
  UINTN                 NewFdtBlobSize;
  VOID*                 fdt;
  INTN                  err;
  INTN                  node;
  INTN                  cpu_node;
  INTN                  lenp;
  CONST VOID*           BootArg;
  EFI_PHYSICAL_ADDRESS  InitrdImageStart;
  EFI_PHYSICAL_ADDRESS  InitrdImageEnd;
  FdtRegion             Region;
  UINTN                 Index;
  CHAR8                 Name[10];
  LIST_ENTRY            ResourceList;
  BDS_SYSTEM_MEMORY_RESOURCE  *Resource;
  ARM_PROCESSOR_TABLE   *ArmProcessorTable;
  ARM_CORE_INFO         *ArmCoreInfoTable;
  UINT32                MpId;
  UINT32                ClusterId;
  UINT32                CoreId;
  UINT64                CpuReleaseAddr;

  err = fdt_check_header ((VOID*)(UINTN)(*FdtBlobBase));
  if (err != 0) {
    Print (L"ERROR: Device Tree header not valid (err:%d)\n", err);
    return EFI_INVALID_PARAMETER;
  }

  //
  // Allocate memory for the new FDT
  //
  NewFdtBlobSize = fdt_totalsize((VOID*)(UINTN)(*FdtBlobBase)) + FDT_ADDITIONAL_ENTRIES_SIZE;

  // Try below a watermark address
  Status = EFI_NOT_FOUND;
  if (PcdGet32(PcdArmLinuxFdtMaxOffset) != 0) {
    NewFdtBlobBase = LINUX_FDT_MAX_OFFSET;
    Status = gBS->AllocatePages (AllocateMaxAddress, EfiBootServicesData, EFI_SIZE_TO_PAGES(NewFdtBlobSize), &NewFdtBlobBase);
    if (EFI_ERROR(Status)) {
      DEBUG ((EFI_D_WARN, "Warning: Failed to load FDT below address 0x%lX (%r). Will try again at a random address anywhere.\n", NewFdtBlobBase, Status));
    }
  }

  // Try anywhere there is available space
  if (EFI_ERROR(Status)) {
    Status = gBS->AllocatePages (AllocateAnyPages, EfiBootServicesData, EFI_SIZE_TO_PAGES(NewFdtBlobSize), &NewFdtBlobBase);
    if (EFI_ERROR(Status)) {
      ASSERT_EFI_ERROR(Status);
      goto FAIL_NEW_FDT;
    } else {
      DEBUG ((EFI_D_WARN, "WARNING: Loaded FDT at random address 0x%lX.\nWARNING: There is a risk of accidental overwriting by other code/data.\n", NewFdtBlobBase));
    }
  }

  // Load the Original FDT tree into the new region
  fdt = (VOID*)(UINTN)NewFdtBlobBase;
  err = fdt_open_into((VOID*)(UINTN)(*FdtBlobBase), fdt, NewFdtBlobSize);
  if (err) {
    DEBUG((EFI_D_ERROR, "fdt_open_into(): %a\n", fdt_strerror(err)));
    Status = EFI_INVALID_PARAMETER;
    goto FAIL_NEW_FDT;
  }

  DEBUG_CODE_BEGIN();
    //DebugDumpFdt (fdt);
  DEBUG_CODE_END();

  node = fdt_subnode_offset(fdt, 0, "chosen");
  if (node < 0) {
    // The 'chosen' node does not exist, create it
    node = fdt_add_subnode(fdt, 0, "chosen");
    if (node < 0) {
      DEBUG((EFI_D_ERROR,"Error on finding 'chosen' node\n"));
      Status = EFI_INVALID_PARAMETER;
      goto FAIL_NEW_FDT;
    }
  }

  DEBUG_CODE_BEGIN();
    BootArg = fdt_getprop(fdt, node, "bootargs", &lenp);
    if (BootArg != NULL) {
      DEBUG((EFI_D_ERROR,"BootArg: %a\n",BootArg));
    }
  DEBUG_CODE_END();

  // Set Linux CmdLine
  if ((CommandLineArguments != NULL) && (AsciiStrLen (CommandLineArguments) > 0)) {
    err = fdt_setprop(fdt, node, "bootargs", CommandLineArguments, AsciiStrSize(CommandLineArguments));
    if (err) {
      DEBUG((EFI_D_ERROR,"Fail to set new 'bootarg' (err:%d)\n",err));
    }
  }

  // Set Linux Initrd
  if (InitrdImageSize != 0) {
    InitrdImageStart = cpu_to_fdt64 (InitrdImage);
    err = fdt_setprop(fdt, node, "linux,initrd-start", &InitrdImageStart, sizeof(EFI_PHYSICAL_ADDRESS));
    if (err) {
      DEBUG((EFI_D_ERROR,"Fail to set new 'linux,initrd-start' (err:%d)\n",err));
    }
    InitrdImageEnd = cpu_to_fdt64 (InitrdImage + InitrdImageSize);
    err = fdt_setprop(fdt, node, "linux,initrd-end", &InitrdImageEnd, sizeof(EFI_PHYSICAL_ADDRESS));
    if (err) {
      DEBUG((EFI_D_ERROR,"Fail to set new 'linux,initrd-start' (err:%d)\n",err));
    }
  }

  // Set Physical memory setup if does not exist
  node = fdt_subnode_offset(fdt, 0, "memory");
  if (node < 0) {
    // The 'memory' node does not exist, create it
    node = fdt_add_subnode(fdt, 0, "memory");
    if (node >= 0) {
      fdt_setprop_string(fdt, node, "name", "memory");
      fdt_setprop_string(fdt, node, "device_type", "memory");
      
      GetSystemMemoryResources (&ResourceList);
      Resource = (BDS_SYSTEM_MEMORY_RESOURCE*)ResourceList.ForwardLink;
      
      if (sizeof(UINTN) == sizeof(UINT32)) {
        Region.Base = cpu_to_fdt32((UINTN)Resource->PhysicalStart);
        Region.Size = cpu_to_fdt32((UINTN)Resource->ResourceLength);
      } else {
        Region.Base = cpu_to_fdt64((UINTN)Resource->PhysicalStart);
        Region.Size = cpu_to_fdt64((UINTN)Resource->ResourceLength);
      }

      err = fdt_setprop(fdt, node, "reg", &Region, sizeof(Region));
      if (err) {
        DEBUG((EFI_D_ERROR,"Fail to set new 'memory region' (err:%d)\n",err));
      }
    }
  }

  // Setup Arm Mpcore Info if it is a multi-core or multi-cluster platforms
  for (Index=0; Index < gST->NumberOfTableEntries; Index++) {
    // Check for correct GUID type
    if (CompareGuid (&gArmMpCoreInfoGuid, &(gST->ConfigurationTable[Index].VendorGuid))) {
      MpId = ArmReadMpidr ();
      ClusterId = GET_CLUSTER_ID(MpId);
      CoreId    = GET_CORE_ID(MpId);

      node = fdt_subnode_offset(fdt, 0, "cpus");
      if (node < 0) {
        // Create the /cpus node
        node = fdt_add_subnode(fdt, 0, "cpus");
        fdt_setprop_string(fdt, node, "name", "cpus");
        fdt_setprop_cell(fdt, node, "#address-cells", 1);
        fdt_setprop_cell(fdt, node, "#size-cells", 0);
      }

      // Get pointer to ARM processor table
      ArmProcessorTable = (ARM_PROCESSOR_TABLE *)gST->ConfigurationTable[Index].VendorTable;
      ArmCoreInfoTable = ArmProcessorTable->ArmCpus;

      for (Index = 0; Index < ArmProcessorTable->NumberOfEntries; Index++) {
        AsciiSPrint (Name, 10, "cpu@%d", Index);
        cpu_node = fdt_subnode_offset(fdt, node, Name);
        if (cpu_node < 0) {
          cpu_node = fdt_add_subnode(fdt, node, Name);
          fdt_setprop_string(fdt, cpu_node, "device-type", "cpu");
          fdt_setprop(fdt, cpu_node, "reg", &Index, sizeof(Index));
        }

        fdt_setprop_string(fdt, cpu_node, "enable-method", "spin-table");
        CpuReleaseAddr = cpu_to_fdt64(ArmCoreInfoTable[Index].MailboxSetAddress);
        fdt_setprop(fdt, cpu_node, "cpu-release-addr", &CpuReleaseAddr, sizeof(CpuReleaseAddr));

        // If it is not the primary core than the cpu should be disabled
        if (((ArmCoreInfoTable[Index].ClusterId != ClusterId) || (ArmCoreInfoTable[Index].CoreId != CoreId))) {
          fdt_setprop_string(fdt, cpu_node, "status", "disabled");
        }
      }
      break;
    }
  }

  DEBUG_CODE_BEGIN();
    //DebugDumpFdt (fdt);
  DEBUG_CODE_END();

  *FdtBlobBase = NewFdtBlobBase;
  *FdtBlobSize = (UINTN)fdt_totalsize ((VOID*)(UINTN)(NewFdtBlobBase));
  return EFI_SUCCESS;

FAIL_NEW_FDT:
  *FdtBlobSize = (UINTN)fdt_totalsize ((VOID*)(UINTN)(*FdtBlobBase));
  // Return success even if we failed to update the FDT blob. The original one is still valid.
  return EFI_SUCCESS;
}