// 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(hlt) { CHK_SUPERV(); do_hlt(ctx); return 0; }
IMPL_START(stop) { CHK_SUPERV(); _except(ctx, E_SHT, "STOP INSTR"); }
IMPL_START(crash) { CHK_SUPERV(); _except(ctx, 1023, "CRASH instruction"); }

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

IMPL_START(trap)
{
    if (p1->val > 255) _except(ctx, E_ILL, "TRAP number greater than 255");
    _except(ctx, p1->val + 256, "TRAP instruction");
}


IMPL_START(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)];

    return 0;
}

IMPL_START(cli) { CHK_SUPERV(); R(CR0) &= ~IF; return 0; }
IMPL_START(sti) { CHK_SUPERV(); R(CR0) |= IF; return 0; }

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

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

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

IMPL_START(devctl)
{
    CHK_SUPERV();

    dev_t *dev = devctl_common(ctx, p1->val);  

    if (dev == NULL)
        return 0;      

    switch (p2->val) {
        case 0: writestr(ctx, R(AX0), DEVLEN, dev->type); break;
        case 1: writestr(ctx, R(AX0), DEVLEN, dev->name); break;
        case 2: writestr(ctx, R(AX0), DEVLEN, dev->modl); break;
        case 3: writestr(ctx, R(AX0), DEVLEN, dev->vend); break;
        case 4: R(RAX) = dev->major; R(RDX) = dev->minor; break;
        case 5: R(RAX) = dev->feats; R(RDX) = dev->revis; break;
        default: R(RAX) = -6; break;
    }

    return 0;
}

IMPL_START(iocall)
{
    CHK_SUPERV();

    long rc;
    dev_t *dev = devctl_common(ctx, p1->val);  

    if (dev == NULL) return 0;
    else if (p2->val >= DEVSLOTS || dev->fslots[p2->val] == NULL) R(RAX) = -6;

    else {
        rc = dev->fslots[p2->val](ctx, dev);
        if (rc < 0) { R(RAX) = rc; R(RDX) = 0; }    
    }

    return 0;
}

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