1 /* 2 * Copyright 2019-2021 Haiku, Inc. All rights reserved. 3 * Released under the terms of the MIT License. 4 */ 5 6 7 #include <boot/platform.h> 8 #include <boot/stage2.h> 9 #include <boot/stdio.h> 10 11 #include <arch_cpu_defs.h> 12 13 #include "mmu.h" 14 #include "serial.h" 15 #include "smp.h" 16 #include "efi_platform.h" 17 #include "arch_traps.h" 18 19 20 // From entry.S 21 extern "C" void arch_enter_kernel(uint64 satp, struct kernel_args *kernelArgs, 22 addr_t kernelEntry, addr_t kernelStackTop); 23 24 // From arch_mmu.cpp 25 extern void arch_mmu_post_efi_setup(size_t memory_map_size, 26 efi_memory_descriptor *memory_map, size_t descriptor_size, 27 uint32_t descriptor_version); 28 29 extern uint64_t arch_mmu_generate_post_efi_page_tables(size_t memory_map_size, 30 efi_memory_descriptor *memory_map, size_t descriptor_size, 31 uint32_t descriptor_version); 32 33 34 #include <arch/riscv64/arch_uart_sifive.h> 35 36 37 void 38 arch_convert_kernel_args(void) 39 { 40 // empty 41 } 42 43 44 void 45 arch_start_kernel(addr_t kernelEntry) 46 { 47 // EFI assumed to be SBI booted 48 gKernelArgs.arch_args.machine_platform = kPlatformSbi; 49 50 // Prepare to exit EFI boot services. 51 // Read the memory map. 52 // First call is to determine the buffer size. 53 size_t memory_map_size = 0; 54 efi_memory_descriptor dummy; 55 efi_memory_descriptor *memory_map; 56 size_t map_key; 57 size_t descriptor_size; 58 uint32_t descriptor_version; 59 if (kBootServices->GetMemoryMap(&memory_map_size, &dummy, &map_key, 60 &descriptor_size, &descriptor_version) != EFI_BUFFER_TOO_SMALL) { 61 panic("Unable to determine size of system memory map"); 62 } 63 64 // Allocate a buffer twice as large as needed just in case it gets bigger 65 // between calls to ExitBootServices. 66 size_t actual_memory_map_size = memory_map_size * 2; 67 memory_map 68 = (efi_memory_descriptor *)kernel_args_malloc(actual_memory_map_size); 69 70 if (memory_map == NULL) 71 panic("Unable to allocate memory map."); 72 73 // Read (and print) the memory map. 74 memory_map_size = actual_memory_map_size; 75 if (kBootServices->GetMemoryMap(&memory_map_size, memory_map, &map_key, 76 &descriptor_size, &descriptor_version) != EFI_SUCCESS) { 77 panic("Unable to fetch system memory map."); 78 } 79 80 addr_t addr = (addr_t)memory_map; 81 dprintf("System provided memory map:\n"); 82 for (size_t i = 0; i < memory_map_size / descriptor_size; ++i) { 83 efi_memory_descriptor *entry 84 = (efi_memory_descriptor *)(addr + i * descriptor_size); 85 dprintf(" phys: %#lx, virt: %#lx, size: %#lx, ", 86 entry->PhysicalStart, entry->VirtualStart, 87 entry->NumberOfPages * B_PAGE_SIZE); 88 switch (entry->Type) { 89 case EfiReservedMemoryType: dprintf("reservedMemoryType"); break; 90 case EfiLoaderCode: dprintf("loaderCode"); break; 91 case EfiLoaderData: dprintf("loaderData"); break; 92 case EfiBootServicesCode: dprintf("bootServicesCode"); break; 93 case EfiBootServicesData: dprintf("bootServicesData"); break; 94 case EfiConventionalMemory: dprintf("conventionalMemory"); break; 95 case EfiACPIReclaimMemory: dprintf("ACPIReclaimMemory"); break; 96 case EfiRuntimeServicesCode: dprintf("runtimeServicesCode"); break; 97 case EfiRuntimeServicesData: dprintf("runtimeServicesData"); break; 98 default: dprintf("?(%d)", entry->Type); 99 } 100 dprintf(", attrs: %#lx\n", entry->Attribute); 101 } 102 103 // Generate page tables for use after ExitBootServices. 104 uint64_t satp = arch_mmu_generate_post_efi_page_tables( 105 memory_map_size, memory_map, descriptor_size, descriptor_version); 106 dprintf("SATP: 0x%016" B_PRIx64 "\n", satp); 107 108 // Attempt to fetch the memory map and exit boot services. 109 // This needs to be done in a loop, as ExitBootServices can change the 110 // memory map. 111 // Even better: Only GetMemoryMap and ExitBootServices can be called after 112 // the first call to ExitBootServices, as the firmware is permitted to 113 // partially exit. This is why twice as much space was allocated for the 114 // memory map, as it's impossible to allocate more now. 115 // A changing memory map shouldn't affect the generated page tables, as 116 // they only needed to know about the maximum address, not any specific 117 // entry. 118 dprintf("Calling ExitBootServices. So long, EFI!\n"); 119 while (true) { 120 if (kBootServices->ExitBootServices(kImage, map_key) == EFI_SUCCESS) { 121 // The console was provided by boot services, disable it. 122 stdout = NULL; 123 stderr = NULL; 124 // Also switch to legacy serial output 125 // (may not work on all systems) 126 serial_switch_to_legacy(); 127 dprintf("Switched to legacy serial output\n"); 128 break; 129 } 130 131 memory_map_size = actual_memory_map_size; 132 if (kBootServices->GetMemoryMap(&memory_map_size, memory_map, &map_key, 133 &descriptor_size, &descriptor_version) != EFI_SUCCESS) { 134 panic("Unable to fetch system memory map."); 135 } 136 } 137 138 arch_traps_init(); 139 140 // Update EFI, generate final kernel physical memory map, etc. 141 arch_mmu_post_efi_setup(memory_map_size, memory_map, 142 descriptor_size, descriptor_version); 143 144 dprintf("[PRE] SetSatp()\n"); 145 SetSatp(satp); 146 dprintf("[POST] SetSatp()\n"); 147 FlushTlbAll(); 148 dprintf("[POST] FlushTlbAll()\n"); 149 150 smp_boot_other_cpus(satp, kernelEntry); 151 152 // Enter the kernel! 153 dprintf("arch_enter_kernel(satp: %#" B_PRIxADDR ", kernelArgs: %#" B_PRIxADDR 154 ", kernelEntry: %#" B_PRIxADDR ", sp: %#" B_PRIxADDR ")\n", satp, 155 (addr_t)&gKernelArgs, (addr_t)kernelEntry, gKernelArgs.cpu_kstack[0].start 156 + gKernelArgs.cpu_kstack[0].size); 157 158 arch_enter_kernel(satp, &gKernelArgs, kernelEntry, 159 gKernelArgs.cpu_kstack[0].start + gKernelArgs.cpu_kstack[0].size); 160 } 161