| /* |
| * |
| * 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]; |
| |
| /* |
| * 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 |
| |
| exception_init(); |
| |
| /* |
| * 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. |
| */ |
| } |