1/* 2 * Copyright 2021-2022 Haiku, Inc. All rights reserved. 3 * Released under the terms of the MIT License. 4 * 5 * Copyright 2008, Dustin Howett, dustin.howett@gmail.com. All rights reserved. 6 * Copyright 2004-2010, Axel D��rfler, axeld@pinc-software.de. 7 * Distributed under the terms of the MIT License. 8 * 9 * Copyright 2001, Travis Geiselbrecht. All rights reserved. 10 * Distributed under the terms of the NewOS License. 11 */ 12 13 14#include "arch_smp.h" 15 16#include <boot/stage2.h> 17 18 19//#define TRACE_SMP 20#ifdef TRACE_SMP 21# define TRACE(x...) dprintf(x) 22#else 23# define TRACE(x...) ; 24#endif 25 26 27extern "C" void smp_trampoline(void); 28extern "C" void smp_trampoline_args(void); 29extern "C" void smp_trampoline_end(void); 30 31struct gdtr { 32 uint16 limit; 33 uint32 base; 34 unsigned char null[8]; 35 unsigned char code[8]; 36 unsigned char data[8]; 37} __attribute__((packed)); 38 39// Arguments passed to the SMP trampoline. 40struct trampoline_args { 41 uint32 trampoline; // Trampoline address 42 uint32 gdt; // GDTR 43 uint32 page_dir; // page directory 44 uint32 kernel_entry; // Kernel entry point 45 uint32 kernel_args; // Kernel arguments 46 uint32 current_cpu; // CPU number 47 uint32 stack_top; // Kernel stack 48 volatile uint32 sentinel; // Sentinel, AP sets to 0 when finished 49 50 // smp_boot_other_cpus puts the GDTR here. 51 struct gdtr gdtr; 52}; 53 54 55void 56copy_trampoline_code(uint64 trampolineCode, uint64 trampolineStack) 57{ 58 TRACE("copying the trampoline code to %p from %p\n", (char*)trampolineCode, (const void*)&smp_trampoline); 59 TRACE("size of trampoline code = %" PRIu64 " bytes\n", (uint64)&smp_trampoline_end - (uint64)&smp_trampoline); 60 memcpy((char *)trampolineCode, (const void*)&smp_trampoline, 61 (uint64)&smp_trampoline_end - (uint64)&smp_trampoline); 62} 63 64 65void 66prepare_trampoline_args(uint64 trampolineCode, uint64 trampolineStack, 67 uint32 pagedir, uint64 kernelEntry, addr_t virtKernelArgs, 68 uint32 currentCpu) 69{ 70 trampoline_args* args = (trampoline_args *)trampolineStack; 71 args->trampoline = trampolineCode; 72 73 args->gdt = (uint32) &args->gdtr; 74 args->gdtr.limit = 23; 75 args->gdtr.base = (uint32)(uint64)args->gdtr.null; 76 #define COPY_ARRAY(A, X0, X1, X2, X3, X4, X5, X6, X7) \ 77 { A[0] = X0; A[1] = X1; A[2] = X2; A[3] = X3; A[4] = X4; A[5] = X5; A[6] = X6; A[7] = X7; } 78 COPY_ARRAY(args->gdtr.null, 0, 0, 0, 0, 0, 0, 0, 0); 79 COPY_ARRAY(args->gdtr.code, 0xff, 0xff, 0, 0, 0, 0x9a, 0xcf, 0); 80 COPY_ARRAY(args->gdtr.data, 0xff, 0xff, 0, 0, 0, 0x92, 0xcf, 0); 81 #undef COPY_ARRAY 82 //TODO: final GDT 83 84 args->page_dir = pagedir; 85 args->kernel_entry = kernelEntry; 86 args->kernel_args = virtKernelArgs; 87 args->current_cpu = currentCpu; 88 args->stack_top = gKernelArgs.cpu_kstack[currentCpu].start 89 + gKernelArgs.cpu_kstack[currentCpu].size; 90 args->sentinel = 1; 91 92 // put the args in the right place 93 uint32 * args_ptr = 94 (uint32 *)(trampolineCode + (uint64)smp_trampoline_args - (uint64)smp_trampoline); 95 *args_ptr = (uint32)trampolineStack; 96} 97 98 99uint32 100get_sentinel(uint64 trampolineStack) 101{ 102 trampoline_args* args = (trampoline_args *)trampolineStack; 103 return args->sentinel; 104} 105