/* vml.c - GENERATED by build-ml.ps1 from vml.s and vmlwrap.c. Do not edit.
 *
 * The machine code helpers as a byte array. mlinit() copies them to $C000.
 */

#define MLBMOVE 0xc161
#define MLKPOP 0xc237
#define MLLADJ 0xc1e3
#define MLROW 0xc102
#define MLSCRN 0xc000
#define MLSIZE 660

char mlcode[660] = {
    32, 86, 194, 162, 15, 189, 0, 196, 149, 75, 202, 16,
    248, 24, 165, 81, 101, 89, 133, 91, 165, 82, 105, 0,
    133, 92, 165, 91, 10, 133, 93, 165, 92, 42, 133, 94,
    24, 165, 93, 101, 77, 133, 93, 165, 94, 101, 78, 133,
    94, 169, 0, 133, 37, 169, 4, 133, 38, 166, 89, 240,
    14, 24, 165, 37, 105, 40, 133, 37, 144, 2, 230, 38,
    202, 208, 242, 165, 89, 133, 95, 169, 0, 133, 40, 133,
    36, 169, 255, 133, 39, 165, 91, 197, 79, 165, 92, 229,
    80, 176, 114, 160, 0, 177, 93, 133, 251, 200, 177, 93,
    133, 252, 24, 165, 91, 105, 1, 170, 165, 92, 105, 0,
    228, 79, 208, 15, 197, 80, 208, 11, 165, 83, 133, 41,
    165, 84, 133, 42, 76, 155, 192, 160, 2, 177, 93, 56,
    233, 1, 133, 41, 200, 177, 93, 233, 0, 133, 42, 24,
    165, 251, 101, 85, 133, 251, 165, 252, 101, 86, 133, 252,
    56, 165, 41, 229, 251, 170, 165, 42, 229, 252, 144, 10,
    208, 4, 224, 41, 144, 2, 162, 40, 134, 36, 24, 165,
    75, 101, 251, 133, 34, 165, 76, 101, 252, 133, 35, 165,
    95, 197, 87, 208, 4, 165, 88, 133, 39, 32, 21, 193,
    165, 95, 197, 90, 176, 33, 230, 95, 230, 91, 208, 2,
    230, 92, 24, 165, 93, 105, 2, 133, 93, 144, 2, 230,
    94, 24, 165, 37, 105, 40, 133, 37, 144, 2, 230, 38,
    76, 79, 192, 76, 117, 194, 32, 86, 194, 162, 6, 189,
    0, 196, 149, 34, 202, 16, 248, 32, 21, 193, 76, 117,
    194, 165, 40, 9, 32, 160, 39, 145, 37, 136, 16, 251,
    160, 0, 196, 36, 240, 45, 177, 34, 201, 32, 176, 2,
    169, 32, 201, 192, 144, 4, 233, 128, 176, 22, 201, 160,
    144, 4, 233, 64, 176, 14, 201, 96, 144, 4, 233, 32,
    176, 6, 201, 64, 144, 2, 233, 64, 5, 40, 145, 37,
    200, 208, 207, 165, 39, 201, 40, 176, 7, 168, 177, 37,
    73, 128, 145, 37, 96, 32, 86, 194, 173, 0, 196, 133,
    34, 173, 1, 196, 133, 35, 173, 2, 196, 133, 37, 173,
    3, 196, 133, 38, 173, 4, 196, 133, 75, 173, 5, 196,
    133, 76, 165, 37, 197, 34, 165, 38, 229, 35, 144, 52,
    24, 165, 35, 101, 76, 133, 35, 24, 165, 38, 101, 76,
    133, 38, 164, 75, 240, 9, 136, 177, 34, 145, 37, 192,
    0, 208, 247, 166, 76, 240, 18, 198, 35, 198, 38, 160,
    0, 136, 177, 34, 145, 37, 192, 0, 208, 247, 202, 208,
    238, 76, 117, 194, 160, 0, 166, 76, 240, 14, 177, 34,
    145, 37, 200, 208, 249, 230, 35, 230, 38, 202, 208, 242,
    166, 75, 240, 229, 177, 34, 145, 37, 200, 202, 208, 248,
    76, 117, 194, 32, 86, 194, 162, 5, 189, 0, 196, 149,
    75, 202, 16, 248, 165, 75, 133, 34, 165, 76, 133, 35,
    165, 77, 133, 75, 165, 78, 133, 76, 165, 79, 133, 77,
    165, 80, 133, 78, 165, 75, 5, 76, 240, 38, 160, 0,
    24, 177, 34, 101, 77, 145, 34, 200, 177, 34, 101, 78,
    145, 34, 24, 165, 34, 105, 2, 133, 34, 144, 2, 230,
    35, 165, 75, 208, 2, 198, 76, 198, 75, 76, 8, 194,
    76, 117, 194, 120, 165, 198, 240, 22, 162, 0, 173, 119,
    2, 72, 189, 120, 2, 157, 119, 2, 232, 224, 9, 208,
    245, 198, 198, 104, 88, 96, 88, 169, 0, 96, 162, 8,
    181, 34, 157, 16, 196, 202, 16, 248, 162, 21, 181, 75,
    157, 25, 196, 202, 16, 248, 165, 251, 141, 47, 196, 165,
    252, 141, 48, 196, 96, 162, 8, 189, 16, 196, 149, 34,
    202, 16, 248, 162, 21, 189, 25, 196, 149, 75, 202, 16,
    248, 173, 47, 196, 133, 251, 173, 48, 196, 133, 252, 96
};

/* vmlwrap.c - the C side of the machine code helpers. build-ml.ps1 appends
 * this to the generated byte array to make vml.c; edit it here.
 *
 * Parameters go through a block at $c400 (not $cf00: the C stack lives just below $d000), then sys() jumps to the entry.
 * On the c64 sys() takes no bank argument: sys(addr, &a, &x, &y).
 */

extern char *bfr;
extern unsigned blen;
extern unsigned lptr[];
extern int nlines, top, leftcol;

/* move the code to $c000 and keep power c's heap and stack below it.
   must run before malloc() */
mlinit()
{
    char *d;
    int i;

    highmem(0xc000);
    d = (char *) 0xc000;
    for (i = 0; i < MLSIZE; i++) d[i] = mlcode[i];
    return 0;
}

/* call an entry, return what it left in A */
mlgo(addr)
unsigned addr;
{
    char a, x, y;

    a = 0;
    x = 0;
    y = 0;
    sys(addr, &a, &x, &y);
    return a & 255;
}

/* The wrappers fill the parameter block through one pointer instead of
   calling a helper per field: every power c function call costs a lot, and
   mlscr runs on every key. Words are stored low byte first. */

/* paint one row at screen address dst: len bytes from src, cursor at column
   cur (255 = none), rev = 128 for an all reverse row */
mlrow(src, len, dst, cur, rev)
unsigned src, dst;
int len, cur, rev;
{
    char *p;

    p = (char *) 0xc400;
    p[0] = src;
    p[1] = src >> 8;
    p[2] = len;
    p[3] = dst;
    p[4] = dst >> 8;
    p[5] = cur;
    p[6] = rev;
    mlgo(MLROW);
    return 0;
}

/* paint screen rows r0..r1 from the buffer; the cursor sits at screen row
   crow (255 = none), column ccol */
mlscr(r0, r1, crow, ccol)
int r0, r1, crow, ccol;
{
    char *p;
    unsigned v;

    p = (char *) 0xc400;
    v = (unsigned) bfr;
    p[0] = v;
    p[1] = v >> 8;
    v = (unsigned) lptr;
    p[2] = v;
    p[3] = v >> 8;
    p[4] = nlines;
    p[5] = nlines >> 8;
    p[6] = top;
    p[7] = top >> 8;
    p[8] = blen;
    p[9] = blen >> 8;
    p[10] = leftcol;
    p[11] = leftcol >> 8;
    p[12] = crow;
    p[13] = ccol;
    p[14] = r0;
    p[15] = r1;
    mlgo(MLSCRN);
    return 0;
}

/* memmove: n bytes from 'from' to 'to', overlap safe */
mlmove(from, to, n)
unsigned from, to, n;
{
    char *p;

    if (n == 0) return 0;
    p = (char *) 0xc400;
    p[0] = from;
    p[1] = from >> 8;
    p[2] = to;
    p[3] = to >> 8;
    p[4] = n;
    p[5] = n >> 8;
    mlgo(MLBMOVE);
    return 0;
}

/* add d to n words starting at address a (line index fix-ups) */
mladj(a, n, d)
unsigned a, n, d;
{
    char *p;

    if (n == 0) return 0;
    p = (char *) 0xc400;
    p[0] = a;
    p[1] = a >> 8;
    p[2] = n;
    p[3] = n >> 8;
    p[4] = d;
    p[5] = d >> 8;
    mlgo(MLLADJ);
    return 0;
}

/* next key from the kernal buffer, or 0 */
mlkey()
{
    return mlgo(MLKPOP);
}