[SeaBIOS] (no subject)

Hello,
I'm trying to read the timer in Seabios to test elapsed time between functions.
Here is my code:
static void readtimer(void)
{
    // Read timer
    struct bregs br;
    memset(&br, 0, sizeof(br));
    br.flags = F_IF;
    br.ah = 0x00;

call16_int(0x1a, &br);

dprintf(1, "timer:%d %d %d\n",br.cx,br.dx,br.al);

}

But gcc tells:
undefined reference to `irq_trampoline_0x1a' (or 26 dec)

What is going wrong with my function ?

Thanks in advance for your help.

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