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runtime: implement RPC syscall

This commit is contained in:
Sebastien Bourdeauducq 2014-07-07 19:13:43 +02:00
parent 09e78a1f5e
commit bb4a992907
1 changed files with 67 additions and 26 deletions
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93
soc/runtime/main.c
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@ -11,24 +11,12 @@
#include "elf_loader.h"
static void receive_sync(void)
{
char c;
int recognized;
enum {
MSGTYPE_KERNEL_FINISHED = 0x01,
MSGTYPE_RPC_REQUEST = 0x02,
};
recognized = 0;
while(1) {
c = readchar();
if(c == 0x5a) {
recognized++;
if(recognized == 4)
return;
} else
recognized = 0;
}
}
static int receive_length(void)
static int receive_int(void)
{
unsigned int r;
int i;
@ -36,11 +24,57 @@ static int receive_length(void)
r = 0;
for(i=0;i<4;i++) {
r <<= 8;
r |= (unsigned char)readchar();
r |= (unsigned char)uart_read();
}
return r;
}
static char receive_char(void)
{
return uart_read();
}
static void send_int(int x)
{
int i;
for(i=0;i<4;i++) {
uart_write((x & 0xff000000) >> 24);
x <<= 8;
}
}
static void send_sint(short int i)
{
uart_write((i >> 8) & 0xff);
uart_write(i & 0xff);
}
static void send_char(char c)
{
uart_write(c);
}
static void receive_sync(void)
{
char c;
int recognized;
recognized = 0;
while(recognized < 4) {
c = uart_read();
if(c == 0x5a)
recognized++;
else
recognized = 0;
}
}
static void send_sync(void)
{
send_int(0x5a5a5a5a);
}
static int download_kernel(void *buffer, int maxlength)
{
int length;
@ -48,25 +82,29 @@ static int download_kernel(void *buffer, int maxlength)
unsigned char *_buffer = buffer;
receive_sync();
length = receive_length();
length = receive_int();
if(length > maxlength)
return -1;
for(i=0;i<length;i++)
_buffer[i] = readchar();
_buffer[i] = receive_char();
send_char(0x4f);
return length;
}
static int rpc(int rpc_num, int n_args, ...)
{
printf("rpc_num=%d n_args=%d\n", rpc_num, n_args);
send_sync();
send_char(MSGTYPE_RPC_REQUEST);
send_sint(rpc_num);
send_char(n_args);
va_list args;
va_start(args, n_args);
while(n_args--)
printf("%d\n", va_arg(args, int));
send_int(va_arg(args, int));
va_end(args);
return 1;
return receive_int();
}
static void gpio_set(int channel, int level)
@ -98,9 +136,12 @@ int main(void)
while(1) {
length = download_kernel(kbuf, sizeof(kbuf));
if(length > 0) {
load_elf(syscalls, kbuf, length, kcode, sizeof(kcode));
flush_cpu_icache();
k();
if(load_elf(syscalls, kbuf, length, kcode, sizeof(kcode))) {
flush_cpu_icache();
k();
send_sync();
send_char(MSGTYPE_KERNEL_FINISHED);
}
}
}