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

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

void do_hlt(ctx_t *ctx)
{
    SDL_Event evt;

    while (1)
    {
        if (SDL_WaitEvent(&evt) == 1)
        {
            if (evt.type == SDL_QUIT)
                die(0);

            if (evt.type == SDL_KEYDOWN)
            {
                console_handle_input(ctx, evt.key.keysym.sym);
                if (evt.key.keysym.sym == SDLK_RETURN)
                    break;
            }
        }
    }
}

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

IMPL_START_0(hlt) { CHK_SUPERV(); do_hlt(ctx); } IMPL_END;
IMPL_START_0(stop) { CHK_SUPERV(); _except(ctx, E_SHT, "STOP INSTR"); } IMPL_END;
IMPL_START_0(crash) { CHK_SUPERV(); _except(ctx, 1023, "CRASH instruction"); } IMPL_END;

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

IMPL_START_1(trap) {
    if (v1 > 255) _except(ctx, E_ILL, "TRAP number greater than 255");
    _except(ctx, v1 + 256, "TRAP instruction");
} IMPL_END;


IMPL_START_0(iret) {
    if (ctx->dumpsw)
        trace("\nReturning from exception #%ld\n\n", R(R13));

    // should do more checks
    R(RIP) = R(R15);
    rfs_current_idx = R(R14);
    ctx->rf = rfs[R(R14)];
}
IMPL_END;

IMPL_START_0(cli) { CHK_SUPERV(); R(CR0) &= ~IF; } IMPL_END;
IMPL_START_0(sti) { CHK_SUPERV(); R(CR0) |= IF; } IMPL_END;

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

//
// code common to devctl and iocall
//
dev_t *devctl_common(ctx_t *ctx, ulong v1, ulong v2)
{
    dev_t *dev = devget(ctx, v1);

    if (!dev) rax = -2;
    else if (dev->state == DEVPWOF) rax = -3;
    else if (dev->state == DEVFERR) rax = -4;
    else if (dev->state == DEVPLUG) rax = -5;
    else return dev;
    return NULL;
}

IMPL_START_2(devctl)
{
    CHK_SUPERV();

    dev_t *dev = devctl_common(ctx, v1, v2);  

    if (dev == NULL)
        return 0;      

    switch (v2) {
        case 0: writestr(ctx, ax0, DEVLEN, dev->type); break;
        case 1: writestr(ctx, ax0, DEVLEN, dev->name); break;
        case 2: writestr(ctx, ax0, DEVLEN, dev->modl); break;
        case 3: writestr(ctx, ax0, DEVLEN, dev->vend); break;
        case 4: rax = dev->major; rdx = dev->minor; break;
        case 5: rax = dev->feats; rdx = dev->revis; break;
        default: rax = -6; break;
    }
}
IMPL_END;

IMPL_START_2(iocall)
{
    CHK_SUPERV();

    long rc;
    dev_t *dev = devctl_common(ctx, v1, v2);  

    if (dev == NULL) return 0;
    else if (v2 >= DEVSLOTS || dev->fslots[v2] == NULL) rax = -6;

    else {
        rc = dev->fslots[v2](ctx, dev);
        if (rc < 0) { rax = rc; rdx = 0; }    
    }
}
IMPL_END;

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