artiq/soc/runtime/kloader.c

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#include <string.h>
#include <generated/csr.h>
#include "log.h"
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#include "clock.h"
#include "flash_storage.h"
#include "mailbox.h"
#include "messages.h"
#include "elf_loader.h"
#include "services.h"
#include "kloader.h"
static struct symbol symtab[128];
static int _symtab_count;
static char _symtab_strings[128*16];
static char *_symtab_strptr;
static void symtab_init(void)
{
memset(symtab, 0, sizeof(symtab));
_symtab_count = 0;
_symtab_strptr = _symtab_strings;
}
static int symtab_add(const char *name, void *target)
{
if(_symtab_count >= sizeof(symtab)/sizeof(symtab[0])) {
log("Too many provided symbols in object");
symtab_init();
return 0;
}
symtab[_symtab_count].name = _symtab_strptr;
symtab[_symtab_count].target = target;
_symtab_count++;
while(1) {
if(_symtab_strptr >= &_symtab_strings[sizeof(_symtab_strings)]) {
log("Provided symbol string table overflow");
symtab_init();
return 0;
}
*_symtab_strptr = *name;
_symtab_strptr++;
if(*name == 0)
break;
name++;
}
return 1;
}
int kloader_load(void *buffer, int length)
{
if(!kernel_cpu_reset_read()) {
log("BUG: attempted to load while kernel CPU running");
return 0;
}
symtab_init();
return load_elf(
resolve_service_symbol, symtab_add,
buffer, length, (void *)KERNELCPU_PAYLOAD_ADDRESS, 4*1024*1024);
}
kernel_function kloader_find(const char *name)
{
return find_symbol(symtab, name);
}
extern char _binary_ksupport_bin_start;
extern char _binary_ksupport_bin_end;
static void start_kernel_cpu(void *addr)
{
memcpy((void *)KERNELCPU_EXEC_ADDRESS, &_binary_ksupport_bin_start,
&_binary_ksupport_bin_end - &_binary_ksupport_bin_start);
mailbox_acknowledge();
mailbox_send(addr);
kernel_cpu_reset_write(0);
}
void kloader_start_bridge(void)
{
start_kernel_cpu(NULL);
}
void kloader_start_user_kernel(kernel_function k)
{
if(!kernel_cpu_reset_read()) {
log("BUG: attempted to start kernel CPU while already running (user kernel)");
return;
}
start_kernel_cpu((void *)k);
}
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static int kloader_start_flash_kernel(char *key)
{
char buffer[32*1024];
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unsigned int len, remain;
kernel_function k;
if(!kernel_cpu_reset_read()) {
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log("BUG: attempted to start kernel CPU while already running (%s)", key);
return 0;
}
#if (defined CSR_SPIFLASH_BASE && defined SPIFLASH_PAGE_SIZE)
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len = fs_read(key, buffer, sizeof(buffer), &remain);
if(len <= 0)
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return 0;
if(remain) {
log("ERROR: %s too long", key);
return 0;
}
if(!kloader_load(buffer, len)) {
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log("ERROR: failed to load ELF binary (%s)", key);
return 0;
}
k = kloader_find("run");
if(!k) {
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log("ERROR: failed to find entry point for ELF kernel (%s)", key);
return 0;
}
start_kernel_cpu((void *)k);
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return 1;
#else
return 0;
#endif
}
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int kloader_start_startup_kernel(void)
{
return kloader_start_flash_kernel("startup_kernel");
}
int kloader_start_idle_kernel(void)
{
return kloader_start_flash_kernel("idle_kernel");
}
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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 < 0x40400000) || (v > (0x4fffffff - 1024*1024))) {
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:
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case MESSAGE_TYPE_WATCHDOG_SET_REQUEST:
case MESSAGE_TYPE_WATCHDOG_CLEAR:
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;
log_va(msg->fmt, msg->args);
mailbox_acknowledge();
break;
}
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case MESSAGE_TYPE_WATCHDOG_SET_REQUEST: {
struct msg_watchdog_set_request *msg = (struct msg_watchdog_set_request *)umsg;
struct msg_watchdog_set_reply reply;
reply.type = MESSAGE_TYPE_WATCHDOG_SET_REPLY;
reply.id = watchdog_set(msg->ms);
mailbox_send_and_wait(&reply);
break;
}
case MESSAGE_TYPE_WATCHDOG_CLEAR: {
struct msg_watchdog_clear *msg = (struct msg_watchdog_clear *)umsg;
watchdog_clear(msg->id);
mailbox_acknowledge();
break;
}
default:
/* handled elsewhere */
break;
}
}
}