KernelLand/Kernel/arch/x86/main.c

   1 /*
   2  * Acess 2
   3  * x86 Kernel Main
   4  * arch/x86/main.c
   5  */
   6 #include <acess.h>
   7 #include <mboot.h>
   8 #include <multiboot2.h>
   9 #include <init.h>
  10 #include <mm_virt.h>
  11 #include <mp.h>
  12 #include <pmemmap.h>
  13
  14 #define VGA_ERRORS      0
  15
  16 #define KERNEL_LOAD     0x100000        // 1MiB
  17 #define MAX_ARGSTR_POS  (0x400000-0x2000)
  18 #define MAX_PMEMMAP_ENTS        16
  19
  20 // === IMPORTS ===
  21 extern char     gKernelEnd[];
  22 extern void     Heap_Install(void);
  23 extern void     Desctab_Install(void);
  24 extern void     MM_PreinitVirtual(void);
  25 extern void     MM_Install(int NPMemRanges, tPMemMapEnt *PMemRanges);
  26 extern void     MM_InstallVirtual(void);
  27 extern void     Threads_Init(void);
  28 extern int      Time_Setup(void);
  29 // --- Core ---
  30 extern void     System_Init(char *Commandline);
  31
  32 // === PROTOTYPES ===
  33  int    kmain(Uint MbMagic, void *MbInfoPtr);
  34
  35 // === GLOBALS ===
  36 char    *gsBootCmdLine = NULL;
  37 struct {
  38         Uint32  PBase;
  39         void    *Base;
  40         Uint    Size;
  41         char    *ArgString;
  42 }       *gaArch_BootModules;
  43  int    giArch_NumBootModules = 0;
  44
  45 // === CODE ===
  46 int kmain(Uint MbMagic, void *MbInfoPtr)
  47 {
  48         tMBoot_Module   *mods;
  49         tMBoot_Info     *mbInfo;
  50         tPMemMapEnt     pmemmap[MAX_PMEMMAP_ENTS];
  51          int    nPMemMapEnts;
  52
  53         LogF("Acess2 x86-"PLATFORM" v"EXPAND_STR(KERNEL_VERSION)"\r\n");
  54         LogF(" Build %i, Git Hash %s\r\n", BUILD_NUM, gsGitHash);
  55
  56         MM_PreinitVirtual();    // Initialise virtual mappings
  57
  58         mbInfo = MbInfoPtr;
  59
  60         switch(MbMagic)
  61         {
  62         // Multiboot 1
  63         case MULTIBOOT_MAGIC: {
  64                 // TODO: Handle when this isn't in the mapped area
  65                 gsBootCmdLine = (char*)(mbInfo->CommandLine + KERNEL_BASE);
  66
  67                 tMBoot_MMapEnt  *ent = (void*)mbInfo->MMapAddr;
  68                 tMBoot_MMapEnt  *last = (void*)(mbInfo->MMapAddr + mbInfo->MMapLength);
  69
  70                 // Build up memory map
  71                 nPMemMapEnts = 0;
  72                 while( ent < last && nPMemMapEnts < MAX_PMEMMAP_ENTS )
  73                 {
  74                         tPMemMapEnt     *nent = &pmemmap[nPMemMapEnts];
  75                         nent->Start = ent->Base;
  76                         nent->Length = ent->Length;
  77                         switch(ent->Type)
  78                         {
  79                         case 1:
  80                                 nent->Type = PMEMTYPE_FREE;
  81                                 break;
  82                         default:
  83                                 nent->Type = PMEMTYPE_RESERVED;
  84                                 break;
  85                         }
  86                         nent->NUMADomain = 0;
  87
  88                         nPMemMapEnts ++;
  89                         ent = (void*)( (tVAddr)ent + ent->Size + 4 );
  90                 }
  91
  92                 // Ensure it's valid
  93                 nPMemMapEnts = PMemMap_ValidateMap(pmemmap, nPMemMapEnts, MAX_PMEMMAP_ENTS);
  94                 // TODO: Error handling
  95
  96                 // Replace kernel with PMEMTYPE_USED
  97                 nPMemMapEnts = PMemMap_MarkRangeUsed(
  98                         pmemmap, nPMemMapEnts, MAX_PMEMMAP_ENTS,
  99                         KERNEL_LOAD, (tVAddr)&gKernelEnd - KERNEL_LOAD - KERNEL_BASE
 100                         );
 101
 102                 // Replace modules with PMEMTYPE_USED
 103                 nPMemMapEnts = PMemMap_MarkRangeUsed(pmemmap, nPMemMapEnts, MAX_PMEMMAP_ENTS,
 104                         mbInfo->Modules, mbInfo->ModuleCount*sizeof(*mods)
 105                         );
 106                 mods = (void*)mbInfo->Modules;
 107                 for( int i = 0; i < mbInfo->ModuleCount; i ++ )
 108                 {
 109                         nPMemMapEnts = PMemMap_MarkRangeUsed(
 110                                 pmemmap, nPMemMapEnts, MAX_PMEMMAP_ENTS,
 111                                 mods->Start, mods->End - mods->Start
 112                                 );
 113                 }
 114
 115                 // Debug - Output map
 116                 PMemMap_DumpBlocks(pmemmap, nPMemMapEnts);
 117
 118                 // Adjust Multiboot structure address
 119                 mbInfo = (void*)( (Uint)MbInfoPtr + KERNEL_BASE );
 120
 121                 break; }
 122
 123         // Multiboot 2
 124         case MULTIBOOT2_MAGIC:
 125                 Panic("Multiboot 2 not yet supported");
 126                 //MM_InstallMBoot2( MbInfo );   // Set up physical memory manager
 127                 return 0;
 128                 break;
 129
 130         default:
 131                 Panic("Multiboot magic invalid %08x, expected %08x or %08x\n",
 132                         MbMagic, MULTIBOOT_MAGIC, MULTIBOOT2_MAGIC);
 133                 return 0;
 134         }
 135
 136         // Set up physical memory manager
 137         MM_Install(nPMemMapEnts, pmemmap);
 138
 139         MM_InstallVirtual();    // Clean up virtual address space
 140         Heap_Install();         // Create initial heap
 141
 142         // Start Multitasking
 143         Threads_Init();
 144
 145         // Start Timers
 146         Time_Setup();
 147
 148         Log_Log("Arch", "Starting VFS...");
 149         // Load Virtual Filesystem
 150         VFS_Init();
 151
 152         // Load initial modules
 153         mods = (void*)( mbInfo->Modules + KERNEL_BASE );
 154         giArch_NumBootModules = mbInfo->ModuleCount;
 155         gaArch_BootModules = malloc( giArch_NumBootModules * sizeof(*gaArch_BootModules) );
 156         for( int i = 0; i < mbInfo->ModuleCount; i ++ )
 157         {
 158                  int    ofs;
 159
 160                 Log_Log("Arch", "Multiboot Module at 0x%08x, 0x%08x bytes (String at 0x%08x)",
 161                         mods[i].Start, mods[i].End-mods[i].Start, mods[i].String);
 162
 163                 gaArch_BootModules[i].PBase = mods[i].Start;
 164                 gaArch_BootModules[i].Size = mods[i].End - mods[i].Start;
 165
 166                 // Always HW map the module data
 167                 ofs = mods[i].Start&0xFFF;
 168                 gaArch_BootModules[i].Base = (void*)( MM_MapHWPages(mods[i].Start,
 169                         (gaArch_BootModules[i].Size+ofs+0xFFF) / 0x1000
 170                         ) + ofs );
 171
 172                 // Only map the string if needed
 173                 if( (tVAddr)mods[i].String > MAX_ARGSTR_POS )
 174                 {
 175                         // Assumes the string is < 4096 bytes long)
 176                         gaArch_BootModules[i].ArgString = (void*)(
 177                                 MM_MapHWPages(mods[i].String, 2) + (mods[i].String&0xFFF)
 178                                 );
 179                 }
 180                 else
 181                         gaArch_BootModules[i].ArgString = (char *)mods[i].String + KERNEL_BASE;
 182         }
 183
 184         // Pass on to Independent Loader
 185         Log_Log("Arch", "Starting system");
 186         System_Init(gsBootCmdLine);
 187
 188         // Sleep forever (sleeping beauty)
 189         for(;;)
 190                 Threads_Sleep();
 191         return 0;
 192 }
 193
 194 void Arch_LoadBootModules(void)
 195 {
 196          int    i, j, numPages;
 197         for( i = 0; i < giArch_NumBootModules; i ++ )
 198         {
 199                 Log_Log("Arch", "Loading '%s'", gaArch_BootModules[i].ArgString);
 200
 201                 if( !Module_LoadMem( gaArch_BootModules[i].Base, gaArch_BootModules[i].Size, gaArch_BootModules[i].ArgString ) )
 202                 {
 203                         Log_Warning("Arch", "Unable to load module");
 204                 }
 205
 206                 // Unmap and free
 207                 numPages = (gaArch_BootModules[i].Size + ((Uint)gaArch_BootModules[i].Base&0xFFF) + 0xFFF) >> 12;
 208                 MM_UnmapHWPages( (tVAddr)gaArch_BootModules[i].Base, numPages );
 209
 210                 for( j = 0; j < numPages; j++ )
 211                         MM_DerefPhys( gaArch_BootModules[i].PBase + (j << 12) );
 212
 213                 if( (tVAddr) gaArch_BootModules[i].ArgString > MAX_ARGSTR_POS )
 214                         MM_UnmapHWPages( (tVAddr)gaArch_BootModules[i].ArgString, 2 );
 215         }
 216         Log_Log("Arch", "Boot modules loaded");
 217         free( gaArch_BootModules );
 218 }