// The OS/K Team licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

#include <pc/console.h>
#include <in/instrs.h>
#include <sys/time.h>
#include <unistd.h>
#include <time.h>

//----------------------------------------------------------------------------//

IMPL_START_0(nop) {} IMPL_END;
IMPL_START_0(cpuid) { rax = rdx = 0; } IMPL_END;

IMPL_START_0(pause) { usleep(5000); } IMPL_END;
IMPL_START_0(xpause) { CHK_SUPERV(); usleep(25000); } IMPL_END;

//----------------------------------------------------------------------------//

IMPL_START_0(break)
{
    trace("\nExecuting BREAK INSTR\n");
    dumpregs(ctx);

    do_hlt(ctx);

    trace("Resuming execution\n");
}
IMPL_END;

IMPL_START_1(dump)
{
    (void)v1;

#ifndef NDEBUG
    if (ctx->dumpsw && !v1)
        trace("0x%lX:\t...\n", rpc);

    else if (!ctx->dumpsw && v1)
        dump_instr(ctx, ctx->cur_in, p1, p2, p3, 0, 0);

    ctx->dumpsw = !!v1;
#endif

}
IMPL_END;

//----------------------------------------------------------------------------//

IMPL_START_1(time) { v1 = time(NULL); } IMPL_OUT;

IMPL_START_3(ytime)
{
    time_t t = time(NULL);
    struct tm *tm = localtime(&t);

    v1 = tm->tm_sec + tm->tm_min * 60
                    + tm->tm_hour * 60 * 60
                    + tm->tm_mday * 60 * 60 * 24;

    v2 = tm->tm_mon;
    v3 = tm->tm_year + 1900;
}
IMPL_OUT_3;

IMPL_START_1(utime)
{
    struct timeval time;
    gettimeofday(&time, NULL);
    v1 = (time.tv_sec * 1000) + (time.tv_usec / 1000);
}
IMPL_OUT;

//----------------------------------------------------------------------------//

IMPL_START_0(cls) {
    R(RAX) = R(RBX) = R(RCX) = R(RDX) = R(RDI) = R(RSI) = R(RFX) = 0;
    for (int i = R10; i <= NX7; i++) R(i) = 0;
} IMPL_END;

IMPL_START_0(clr) {
    R(RAX) = R(RBX) = R(RCX) = R(RDX) = R(RDI) = R(RSI) = R(RFX) = 0;
    for (int i = R10; i <= R15; i++) R(i) = 0;
} IMPL_END;

IMPL_START_0(cla) { for (int i = AX0; i <= AX7; i++) R(i) = 0; } IMPL_END;
IMPL_START_0(cln) { for (int i = NX0; i <= NX7; i++) R(i) = 0; } IMPL_END;

//----------------------------------------------------------------------------//

IMPL_START_0(cli) { CHK_SUPERV(); R(CR0) &= ~IF; } IMPL_END;
IMPL_START_0(sti) { CHK_SUPERV(); R(CR0) |= IF; } IMPL_END;
IMPL_START_0(cld) { R(RFX) &= ~DF; } IMPL_END;
IMPL_START_0(clc) { R(RFX) &= ~CF; } IMPL_END;
IMPL_START_0(std) { R(RFX) |= DF; } IMPL_END;
IMPL_START_0(stc) { R(RFX) |= CF; } IMPL_END;
IMPL_START_0(cmc) { R(RFX) = (R(RFX)&CF ? R(RFX)&~CF : R(RFX)|CF); } IMPL_END;

//----------------------------------------------------------------------------//

IMPL_START_2(bswap)
{
    v1 = ((v2 & 0xFF00000000000000) >> 56)
       | ((v2 & 0x00FF000000000000) >> 40)
       | ((v2 & 0x0000FF0000000000) >> 24)
       | ((v2 & 0x000000FF00000000) >> 8)
       | ((v2 & 0x00000000FF000000) << 8)
       | ((v2 & 0x0000000000FF0000) << 24)
       | ((v2 & 0x000000000000FF00) << 40)
       | ((v2 & 0x00000000000000FF) << 56);
}
IMPL_OUT;

IMPL_START_2(wswap)
{
    v1 = ((v2 & 0xFFFF000000000000) >> 48)
       | ((v2 & 0x0000FFFF00000000) >> 16)
       | ((v2 & 0x00000000FFFF0000) << 16)
       | ((v2 & 0x000000000000FFFF) << 48);
}
IMPL_OUT;

IMPL_START_2(dswap)
{
    v1 = ((v2 & 0xFFFFFFFF00000000) >> 32)
       | ((v2 & 0x00000000FFFFFFFF) << 32);
}
IMPL_OUT;

//----------------------------------------------------------------------------//

IMPL_START_1(prn)
{
    // Magic value? :)
    if (__builtin_expect(v1 == 0xC15000AF, 0))
        console_clear(ctx);

    else
    {
        if (p1->mlen > 1) {
            trace("prn warning: large access size\n");
        }
        console_putc(ctx, (char)v1);
    }
}
IMPL_END

IMPL_START_0(prns)
{
    uchar ch = readmemzx(ctx, R(p1->reg), 1);

    COMPARE(ch, 0);

    if ((rfx & ZF) == 0)
    {
        console_putc(ctx, ch);

        if (rfx & DF)
            R(p1->reg)--;
        else
            R(p1->reg)++;
    }
}
IMPL_END

IMPL_START_1(scan)
{
    v1 = console_scankeybuf(ctx);
}
IMPL_OUT;

//----------------------------------------------------------------------------//