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