/* * This file is part of the libpayload project. * * Copyright (C) 2008 Advanced Micro Devices, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <exception.h> #include <libpayload.h> #include <arch/mmu.h> int main_argc; /**< The argc value to pass to main() */ /** The argv value to pass to main() */ char *main_argv[MAX_ARGC_COUNT]; unsigned int test_exc; static int test_exception(void) { uint64_t *a = (uint64_t *)0xfffffffff0000000ULL; test_exc = 1; printf("%llx\n", *a); return 0; } /* * Func: pre_sysinfo_scan_mmu_setup * Desc: We need to setup and enable MMU before we can go to scan coreboot * tables. However, we are not sure what all memory regions to map. Thus, * initializing minimum required memory ranges */ static void pre_sysinfo_scan_mmu_setup(void) { uint64_t start = (uint64_t)&_start; uint64_t end = (uint64_t)&_end; /* Memory range 1: Covers the area occupied by payload */ mmu_presysinfo_memory_used(start, end - start); /* * Memory range 2: coreboot tables * * Maximum size is assumed 2 pages in case it crosses the GRANULE_SIZE * boundary */ mmu_presysinfo_memory_used((uint64_t)get_cb_header_ptr(), 2 * GRANULE_SIZE); mmu_presysinfo_enable(); } /* * Func: post_sysinfo_scan_mmu_setup * Desc: Once we have scanned coreboot tables, we have complete information * about different memory ranges. Thus, we can perform a complete mmu * initialization. Also, this takes care of DMA area setup */ static void post_sysinfo_scan_mmu_setup(void) { struct memrange *ranges; uint64_t nranges; struct mmu_ranges mmu_ranges; struct mmu_memrange *dma_range; /* Get memrange info from lib_sysinfo */ lib_sysinfo_get_memranges(&ranges, &nranges); /* Get memory ranges for mmu init from lib_sysinfo memrange */ dma_range = mmu_init_ranges_from_sysinfo(ranges, nranges, &mmu_ranges); /* Disable mmu */ mmu_disable(); /* Init mmu */ mmu_init(&mmu_ranges); /* Enable mmu */ mmu_enable(); /* Init dma memory */ init_dma_memory((void *)dma_range->base, dma_range->size); } /** * This is our C entry function - set up the system * and jump into the payload entry point. */ void start_main(void); void start_main(void) { extern int main(int argc, char **argv); pre_sysinfo_scan_mmu_setup(); /* Gather system information. */ lib_get_sysinfo(); post_sysinfo_scan_mmu_setup(); #if !CONFIG(LP_SKIP_CONSOLE_INIT) console_init(); #endif printf("ARM64: Libpayload %s\n",__func__); exception_init(); test_exception(); /* * Any other system init that has to happen before the * user gets control goes here. */ /* * Go to the entry point. * In the future we may care about the return value. */ (void) main(main_argc, (main_argc != 0) ? main_argv : NULL); /* * Returning here will go to the _leave function to return * us to the original context. */ }