Vx69 X86 UP
代码语言：javascript复制/*******************************************************************************
* This is the system start-up entry point for VxWorks in RAM,
* the first code executed after booting.
* It disables interrupts, sets up the stack,
* and jumps to the C routine usrInit() in usrConfig.c.
* The initial stack is set to grow down from the address of sysInit().
* This stack is used only by usrInit() and is never used again.
* Memory for the stack must be accounted for
* when determining the system load address.
*/
sysInit:
/* lock interrupt */
cli
/* save the startType */
movl SP_ARG1(%esp),�x
/* initialize stack pointer */
movl $FUNC(sysInit),%esp
/* initialize frame pointer */
movl $0,�p
/* initialize CR0 */
/* clear PG(31), AM(18), WP(16), TS(3), EM(2), MP(1) */
movl %cr0, �x;
andl $0x7ffafff1, �x;
movl �x, %cr0;
/* initialize EFLAGS */
xorl �x, �x;
pushl �x;
popfl;
/* initialize CR4 */
xorl �x, �x
movl �x, %cr4
pushl �x /* push the startType */
movl $FUNC(usrInit),�x
movl $FUNC(sysInit),�x/* push return address */
pushl �x /* for emulation for call */
pushl $0 /* push EFLAGS, 0 */
pushl $0x0008 /* a selector 0x08 is 2nd one */
pushl �x /* push EIP, FUNC(usrInit) */
/* return */
iret
