1 /* 2 * Copyright 2003-2010, Axel Dörfler, axeld@pinc-software.de. 3 * Copyright 2011, Alexander von Gluck, kallisti5@unixzen.com 4 * Copyright 2019, Adrien Destugues, pulkomandy@pulkomandy.tk 5 * Distributed under the terms of the MIT License. 6 */ 7 8 9 #include "start.h" 10 11 #include <string.h> 12 13 #include <OS.h> 14 15 #include <boot/platform.h> 16 #include <boot/stage2.h> 17 #include <boot/heap.h> 18 #include <platform/openfirmware/openfirmware.h> 19 #include <platform_arch.h> 20 21 #include "console.h" 22 #include "machine.h" 23 #include "real_time_clock.h" 24 25 26 #define HEAP_SIZE 65536 27 28 29 // GCC defined globals 30 extern void (*__ctor_list)(void); 31 extern void (*__ctor_end)(void); 32 33 uint32 gMachine; 34 static uint32 sBootOptions; 35 36 37 void 38 call_ctors(void) 39 { 40 void (**f)(void); 41 42 for (f = &__ctor_list; f < &__ctor_end; f++) { 43 (**f)(); 44 } 45 } 46 47 48 extern "C" void 49 platform_start_kernel(void) 50 { 51 preloaded_elf32_image* image = static_cast<preloaded_elf32_image*>( 52 gKernelArgs.kernel_image.Pointer()); 53 54 addr_t kernelEntry = image->elf_header.e_entry; 55 addr_t stackTop = gKernelArgs.cpu_kstack[0].start 56 + gKernelArgs.cpu_kstack[0].size; 57 58 printf("kernel entry at %p\n", (void*)kernelEntry); 59 printf("kernel stack top: %p\n", (void*)stackTop); 60 61 /* TODO: ? 62 mmu_init_for_kernel(); 63 smp_boot_other_cpus(); 64 */ 65 66 status_t error = arch_start_kernel(&gKernelArgs, kernelEntry, stackTop); 67 68 panic("Kernel returned! Return value: %" B_PRId32 "\n", error); 69 } 70 71 72 extern "C" void 73 platform_exit(void) 74 { 75 of_interpret("reset-all", 0, 0); 76 } 77 78 79 extern "C" uint32 80 platform_boot_options(void) 81 { 82 return sBootOptions; 83 } 84 85 86 extern "C" void 87 start(void *openFirmwareEntry) 88 { 89 char bootargs[512]; 90 91 // stage2 args - might be set via the command line one day 92 stage2_args args; 93 args.heap_size = HEAP_SIZE; 94 args.arguments = NULL; 95 96 if (of_init((intptr_t (*)(void*))openFirmwareEntry) != B_OK) 97 return; 98 99 // check for arguments 100 if (of_getprop(gChosen, "bootargs", bootargs, sizeof(bootargs)) 101 != OF_FAILED) { 102 static const char *sArgs[] = { NULL, NULL }; 103 sArgs[0] = (const char *)bootargs; 104 args.arguments = sArgs; 105 args.arguments_count = 1; 106 } 107 108 determine_machine(); 109 if (console_init() != B_OK) 110 return; 111 112 #ifdef __powerpc__ 113 if ((gMachine & MACHINE_QEMU) != 0) 114 dprintf("OpenBIOS (QEMU?) OpenFirmware machine detected\n"); 115 else if ((gMachine & MACHINE_PEGASOS) != 0) 116 dprintf("Pegasos PowerPC machine detected\n"); 117 else 118 dprintf("Apple PowerPC machine assumed\n"); 119 #endif 120 121 // Initialize and take over MMU and set the OpenFirmware callbacks - it 122 // will ask us for memory after that instead of maintaining it itself 123 // (the kernel will need to adjust the callback later on as well) 124 arch_mmu_init(); 125 126 if (boot_arch_cpu_init() != B_OK) 127 of_exit(); 128 129 if (init_real_time_clock() != B_OK) 130 of_exit(); 131 132 // check for key presses once 133 sBootOptions = 0; 134 int key = console_check_for_key(); 135 if (key == 32) { 136 // space bar: option menu 137 sBootOptions |= BOOT_OPTION_MENU; 138 } else if (key == 27) { 139 // ESC: debug output 140 sBootOptions |= BOOT_OPTION_DEBUG_OUTPUT; 141 } 142 143 gKernelArgs.platform_args.openfirmware_entry = openFirmwareEntry; 144 145 main(&args); 146 // if everything goes fine, main() never returns 147 148 of_exit(); 149 } 150