artiq/soc/runtime/kloader.c

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#include <string.h>
#include <generated/csr.h>
#include "log.h"
#include "flash_storage.h"
#include "mailbox.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);
}
void kloader_start_idle_kernel(void)
{
char buffer[32*1024];
int len;
kernel_function k;
if(!kernel_cpu_reset_read()) {
log("BUG: attempted to start kernel CPU while already running (idle kernel)");
return;
}
len = fs_read("idle_kernel", buffer, sizeof(buffer), NULL);
if(len <= 0)
return;
if(!kloader_load(buffer, len)) {
log("Failed to load ELF binary for idle kernel");
return;
}
k = kloader_find("run");
if(!k) {
log("Failed to find entry point for ELF kernel");
return;
}
start_kernel_cpu((void *)k);
}
void kloader_stop_kernel(void)
{
kernel_cpu_reset_write(1);
mailbox_acknowledge();
}