// System call stubs.

#include <inc/syscall.h>
#include <inc/lib.h>

static inline int
syscall(int num, u_int a1, u_int a2, u_int a3, u_int a4, u_int a5)
{
	int ret;

	// Generic system call: pass system call number in AX,
	// up to five parameters in DX, CX, BX, DI, SI.
	// Interrupt kernel with T_SYSCALL.
	//
	// The "volatile" tells the assembler not to optimize
	// this instruction away just because we don't use the
	// return value.
	// 
	// The last clause tells the assembler that this can
	// potentially change the condition codes and arbitrary
	// memory locations.

	asm volatile("int %1\n"
		: "=a" (ret)
		: "i" (T_SYSCALL),
		  "a" (num),
		  "d" (a1),
		  "c" (a2),
		  "b" (a3),
		  "D" (a4),
		  "S" (a5)
		: "cc", "memory");
	return ret;
}

void
sys_cputs(char *a1)
{
	syscall(SYS_cputs, (u_int) a1, 0, 0, 0, 0);
}

int
sys_cgetc(void)
{
	return syscall(SYS_cgetc, 0, 0, 0, 0, 0);
}

int
sys_env_destroy(u_int envid)
{
	return syscall(SYS_env_destroy, envid, 0, 0, 0, 0);
}

u_int
sys_getenvid(void)
{
	 return syscall(SYS_getenvid, 0, 0, 0, 0, 0);
}