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/*
*
* 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>
/*
* 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(0, NULL);
/*
* Returning here will go to the _leave function to return
* us to the original context.
*/
}
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