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////////////////////////////////////////////////////////////////////////////////
///
/// @file main.c
///
/// @project
///
/// @brief Main stage1 code
///
////////////////////////////////////////////////////////////////////////////////
///
////////////////////////////////////////////////////////////////////////////////
///
/// @copyright Copyright (c) 2018, Evan Lojewski
/// @cond
///
/// All rights reserved.
///
/// 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. Neither the name of the copyright holder nor the
/// names of its contributors may be used to endorse or promote products
/// derived from this software without specific prior written permission.
///
////////////////////////////////////////////////////////////////////////////////
///
/// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
/// @endcond
////////////////////////////////////////////////////////////////////////////////
#include <APE_SHM.h>
int __start()
{
// Update SHM.Sig to signal ready.
SHM.SegSig.bits.Sig = SHM_SEG_SIG_SIG_LOADER;
SHM.FwStatus.bits.Ready = 1;
for (;;)
{
uint32_t command = SHM.LoaderCommand.bits.Command;
if (!command)
{
continue;
}
uint32_t arg0 = SHM.LoaderArg0.r32;
uint32_t arg1 = SHM.LoaderArg1.r32;
switch (command)
{
default:
break;
case SHM_LOADER_COMMAND_COMMAND_READ_MEM:
{
// Read word address specified in arg0
uint32_t *addr = ((void *)arg0);
SHM.LoaderArg0.r32 = *addr;
break;
}
case SHM_LOADER_COMMAND_COMMAND_WRITE_MEM:
{
// Write word address specified in arg0 with arg1
uint32_t *addr = ((void *)arg0);
*addr = arg1;
break;
}
case SHM_LOADER_COMMAND_COMMAND_CALL:
{
// call address specified in arg0.
void (*function)(uint32_t) = ((void *)arg0);
function(arg1);
break;
}
}
// Mark command as handled.
SHM.LoaderCommand.bits.Command = 0;
}
}
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