artiq/soc/runtime/kloader.c

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C
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#include <string.h>
#include <generated/csr.h>
#include <dyld.h>
#include "kloader.h"
#include "log.h"
#include "flash_storage.h"
#include "mailbox.h"
#include "messages.h"
static void start_kernel_cpu(struct msg_load_request *msg)
{
// Stop kernel CPU before messing with its code.
kernel_cpu_reset_write(1);
// Load kernel support code.
extern void _binary_ksupport_elf_start, _binary_ksupport_elf_end;
memcpy((void *)(KERNELCPU_EXEC_ADDRESS - KSUPPORT_HEADER_SIZE),
&_binary_ksupport_elf_start,
&_binary_ksupport_elf_end - &_binary_ksupport_elf_start);
// Start kernel CPU.
mailbox_send(msg);
kernel_cpu_reset_write(0);
}
void kloader_start_bridge()
{
start_kernel_cpu(NULL);
}
static int load_or_start_kernel(void *library, int run_kernel)
{
static struct dyld_info library_info;
struct msg_load_request request = {
.library = library,
.library_info = &library_info,
.run_kernel = run_kernel,
};
start_kernel_cpu(&request);
struct msg_load_reply *reply = mailbox_wait_and_receive();
mailbox_acknowledge();
if(reply->type != MESSAGE_TYPE_LOAD_REPLY) {
log("BUG: unexpected reply to load/run request");
return 0;
}
if(reply->error != NULL) {
log("cannot load kernel: %s", reply->error);
return 0;
}
return 1;
}
int kloader_load_library(void *library)
{
if(!kernel_cpu_reset_read()) {
log("BUG: attempted to load kernel library while kernel CPU is running");
return 0;
}
return load_or_start_kernel(library, 0);
}
void kloader_start_kernel()
{
load_or_start_kernel(NULL, 1);
}
int kloader_start_idle_kernel(void)
{
#if (defined CSR_SPIFLASH_BASE && defined SPIFLASH_PAGE_SIZE)
char buffer[32*1024];
int length;
length = fs_read("idle_kernel", buffer, sizeof(buffer), NULL);
if(length <= 0)
return 0;
return load_or_start_kernel(buffer, 1);
#else
return 0;
#endif
}
2015-05-09 17:11:34 +08:00
void kloader_stop(void)
{
kernel_cpu_reset_write(1);
mailbox_acknowledge();
}
int kloader_validate_kpointer(void *p)
{
unsigned int v = (unsigned int)p;
if((v < KERNELCPU_EXEC_ADDRESS) || (v > KERNELCPU_LAST_ADDRESS)) {
log("Received invalid pointer from kernel CPU: 0x%08x", v);
return 0;
}
return 1;
}
int kloader_is_essential_kmsg(int msgtype)
{
switch(msgtype) {
case MESSAGE_TYPE_NOW_INIT_REQUEST:
case MESSAGE_TYPE_NOW_SAVE:
case MESSAGE_TYPE_LOG:
return 1;
default:
return 0;
}
}
long long int now;
void kloader_service_essential_kmsg(void)
{
struct msg_base *umsg;
umsg = mailbox_receive();
if(umsg) {
if(!kloader_validate_kpointer(umsg))
return;
switch(umsg->type) {
case MESSAGE_TYPE_NOW_INIT_REQUEST: {
struct msg_now_init_reply reply;
reply.type = MESSAGE_TYPE_NOW_INIT_REPLY;
reply.now = now;
mailbox_send_and_wait(&reply);
break;
}
case MESSAGE_TYPE_NOW_SAVE: {
struct msg_now_save *msg = (struct msg_now_save *)umsg;
now = msg->now;
mailbox_acknowledge();
break;
}
case MESSAGE_TYPE_LOG: {
struct msg_log *msg = (struct msg_log *)umsg;
if(msg->no_newline) {
lognonl_va(msg->fmt, msg->args);
} else {
log_va(msg->fmt, msg->args);
}
mailbox_acknowledge();
break;
}
default:
/* handled elsewhere */
break;
}
}
}