time_page_fetch.c

ulong time_page_fetch (ulong addr)
{
	volatile ulong v=0;

	asm volatile (
	"    movq   %0, %%rsi          \n"
	:: "m"(addr)
	);

	asm volatile (
	"    xor    %eax, %eax         \n"
	"    rdtsc                     \n"
	"    shl    $32, %rdx          \n"
	"    orq    %rax, %rdx         \n"
	"    movl   $1000000, %edi     \n"
	"pf: prefetcht0 (%rsi)         \n"
	"    decl   %edi               \n"
	"    jne    pf                 \n"
	"    movq   %rdx, %rdi         \n"
	"    xor    %eax, %eax         \n"
	"    rdtsc                     \n"
	"    shl    $32, %rdx          \n"
	"    orq    %rax, %rdx         \n"
	"    subq   %rdi, %rdx         \n"
	);

	asm volatile (
	"    movq   %%rdx, %0          \n"
	:: "m"(v)
	);

	return v;
}