bios__nap_8c_source.html

 #include <ipxe/nap.h>
 #include <realmode.h>

 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

 /**
  * Save power by halting the CPU until the next interrupt
  *
  */
 static void bios_cpu_nap ( void ) {
         __asm__ __volatile__ ( "sti\n\t"
                                "hlt\n\t"
                                "cli\n\t" );
 }

 PROVIDE_NAP ( pcbios, cpu_nap, bios_cpu_nap );
nap.h
CPU sleeping.

realmode.h

FILE_LICENCE
FILE_LICENCE(GPL2_OR_LATER_OR_UBDL)

bios_cpu_nap
static void bios_cpu_nap(void)
Save power by halting the CPU until the next interrupt.
Definition: bios_nap.c:10

__volatile__
__asm__ __volatile__("call *%9" :"=a"(result), "=c"(discard_ecx), "=d"(discard_edx) :"d"(0), "a"(code), "b"(0), "c"(in_phys), "D"(0), "S"(out_phys), "m"(hypercall))

__asm__
__asm__(".section \".rodata\", \"a\", " PROGBITS "\n\t" "\nprivate_key_data:\n\t" ".size private_key_data, ( . - private_key_data )\n\t" ".equ private_key_len, ( . - private_key_data )\n\t" ".previous\n\t")

cpu_nap
void cpu_nap(void)
Sleep with interrupts enabled until next CPU interrupt.

PROVIDE_NAP
PROVIDE_NAP(pcbios, cpu_nap, bios_cpu_nap)