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73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/*
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* Copyright (C) 2018 bzt (bztsrc@github)
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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#include "uart.h"
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void main()
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{
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int size=0;
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char *kernel=(char*)0x80000;
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// set up serial console
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uart_init();
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// say hello. To reduce loader size I removed uart_puts()
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again:
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uart_send('R');
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uart_send('B');
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uart_send('I');
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uart_send('N');
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uart_send('6');
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uart_send('4');
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uart_send('\r');
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uart_send('\n');
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// notify raspbootcom to send the kernel
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uart_send(3);
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uart_send(3);
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uart_send(3);
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// read the kernel's size
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size=uart_getc();
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size|=uart_getc()<<8;
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size|=uart_getc()<<16;
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size|=uart_getc()<<24;
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// send negative or positive acknowledge
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if(size<64 || size>1024*1024) {
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// size error
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uart_send('S');
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uart_send('E');
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goto again;
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}
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uart_send('O');
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uart_send('K');
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// read the kernel
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while(size--) *kernel++ = uart_getc();
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// jump to the new kernel
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asm volatile ("b 0x80000");
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}
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