#include <sys/sysinfo.h>
#include "syscall.h"
#include "libc.h"

#define klong long long
#define kulong unsigned long long

struct kernel_sysinfo {
  klong uptime;
  kulong loads[3];
  kulong totalram;
  kulong freeram;
  kulong sharedram;
  kulong bufferram;
  kulong totalswap;
  kulong freeswap;
  short procs;
  short pad;
  kulong totalhigh;
  kulong freehigh;
  unsigned mem_unit;
};

int __lsysinfo(struct sysinfo* info) {
  struct kernel_sysinfo tmp;
  int ret = syscall(SYS_sysinfo, &tmp);
  if (ret == -1)
    return ret;
  info->uptime = tmp.uptime;
  info->loads[0] = tmp.loads[0];
  info->loads[1] = tmp.loads[1];
  info->loads[2] = tmp.loads[2];
  kulong shifts;
  kulong max = tmp.totalram | tmp.totalswap;
  __asm__("bsr %1,%0" : "=r"(shifts) : "r"(max));
  shifts = shifts >= 32 ? shifts - 31 : 0;
  info->totalram = tmp.totalram >> shifts;
  info->freeram = tmp.freeram >> shifts;
  info->sharedram = tmp.sharedram >> shifts;
  info->bufferram = tmp.bufferram >> shifts;
  info->totalswap = tmp.totalswap >> shifts;
  info->freeswap = tmp.freeswap >> shifts;
  info->procs = tmp.procs;
  info->totalhigh = tmp.totalhigh >> shifts;
  info->freehigh = tmp.freehigh >> shifts;
  info->mem_unit = (tmp.mem_unit ? tmp.mem_unit : 1) << shifts;
  return ret;
}

weak_alias(__lsysinfo, sysinfo);