Subversion Repositories planix.SVN

#include "mem.h"

/*
 * This must match io.h.
 */
#define VectorSYSCALL   0x40

/*
 *  Used to get to the first process:
 *      set up an interrupt return frame and IRET to user level.
 */
TEXT touser(SB), $0
        PUSHL   $(UDSEL)                        /* old ss */
        MOVL    sp+0(FP), AX                    /* old sp */
        PUSHL   AX
        MOVL    $0x200, AX                      /* interrupt enable flag */
        PUSHL   AX                              /* old flags */
        PUSHL   $(UESEL)                        /* old cs */
        PUSHL   $(UTZERO+32)                    /* old pc */
        MOVL    $(UDSEL), AX
        MOVW    AX, DS
        MOVW    AX, ES
        MOVW    AX, GS
        MOVW    AX, FS
        IRETL

/*
 * This is merely _strayintr from l.s optimised to vector
 * to syscall() without going through trap().
 */
TEXT _syscallintr(SB), $0
        PUSHL   $VectorSYSCALL                  /* trap type */

        PUSHL   DS
        PUSHL   ES
        PUSHL   FS
        PUSHL   GS
        PUSHAL
        MOVL    $(KDSEL), AX
        MOVW    AX, DS
        MOVW    AX, ES
        PUSHL   SP
        CALL    syscall(SB)

        POPL    AX
        POPAL
        POPL    GS
        POPL    FS
        POPL    ES
        POPL    DS
        ADDL    $8, SP                          /* pop error code and trap type */
        IRETL