forked from M-Labs/artiq
129 lines
2.1 KiB
C
129 lines
2.1 KiB
C
#include <stdarg.h>
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#include <crc.h>
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#include <uart.h>
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#include <generated/csr.h>
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#include "corecom.h"
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enum {
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MSGTYPE_REQUEST_IDENT = 0x01,
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MSGTYPE_LOAD_KERNEL = 0x02,
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MSGTYPE_KERNEL_FINISHED = 0x03,
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MSGTYPE_RPC_REQUEST = 0x04,
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};
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static int receive_int(void)
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{
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unsigned int r;
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int i;
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r = 0;
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for(i=0;i<4;i++) {
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r <<= 8;
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r |= (unsigned char)uart_read();
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}
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return r;
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}
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static char receive_char(void)
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{
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return uart_read();
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}
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static void send_int(int x)
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{
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int i;
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for(i=0;i<4;i++) {
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uart_write((x & 0xff000000) >> 24);
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x <<= 8;
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}
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}
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static void send_sint(short int i)
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{
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uart_write((i >> 8) & 0xff);
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uart_write(i & 0xff);
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}
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static void send_char(char c)
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{
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uart_write(c);
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}
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static void receive_sync(void)
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{
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char c;
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int recognized;
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recognized = 0;
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while(recognized < 4) {
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c = uart_read();
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if(c == 0x5a)
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recognized++;
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else
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recognized = 0;
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}
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}
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static void send_sync(void)
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{
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send_int(0x5a5a5a5a);
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}
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int ident_and_download_kernel(void *buffer, int maxlength)
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{
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int length;
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unsigned int crc;
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int i;
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char msgtype;
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unsigned char *_buffer = buffer;
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while(1) {
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receive_sync();
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msgtype = receive_char();
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if(msgtype == MSGTYPE_REQUEST_IDENT) {
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send_int(0x41524f52); /* "AROR" - ARTIQ runtime on OpenRISC */
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send_int(1000000000000LL/identifier_frequency_read()); /* RTIO clock period in picoseconds */
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} else if(msgtype == MSGTYPE_LOAD_KERNEL) {
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length = receive_int();
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if(length > maxlength) {
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send_char(0x4c); /* Incorrect length */
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return -1;
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}
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crc = receive_int();
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for(i=0;i<length;i++)
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_buffer[i] = receive_char();
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if(crc32(buffer, length) != crc) {
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send_char(0x43); /* CRC failed */
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return -1;
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}
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send_char(0x4f); /* kernel reception OK */
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return length;
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} else
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return -1;
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}
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}
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int rpc(int rpc_num, int n_args, ...)
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{
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send_sync();
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send_char(MSGTYPE_RPC_REQUEST);
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send_sint(rpc_num);
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send_char(n_args);
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va_list args;
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va_start(args, n_args);
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while(n_args--)
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send_int(va_arg(args, int));
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va_end(args);
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return receive_int();
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}
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void kernel_finished(void)
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{
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send_sync();
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send_char(MSGTYPE_KERNEL_FINISHED);
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}
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