ref: 447672be5c1e3e0b972c793d243383c429240b71
parent: f14e277c584f6f7d1967bb005976cd831b4b74de
author: aiju <devnull@localhost>
date: Tue Mar 28 15:43:09 EDT 2017
add games/blit
--- /dev/null
+++ b/sys/src/games/blit/blit.c
@@ -1,0 +1,219 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <draw.h>
+#include <keyboard.h>
+#include <mouse.h>
+#include <cursor.h>
+#include "dat.h"
+#include "fns.h"
+
+int baud = 40000;
+int scale = 1;
+Rectangle picr;
+Image *tmp, *bg;
+Channel *keych, *uartrxch, *uarttxch;
+Mousectl *mc;
+int daddr;
+u16int dstat;
+u8int invert;
+int vblctr, uartrxctr;
+Rectangle updated;
+u32int colbgv, colfgv;
+Image *colbg, *colfg;
+int realcolors;
+
+static void
+screeninit(void)
+{+ Point p;
+
+ p = divpt(addpt(screen->r.min, screen->r.max), 2);
+ picr = (Rectangle){subpt(p, Pt(scale * SX/2, scale * SY/2)), addpt(p, Pt(scale * SX/2, scale * SY/2))};+ if(tmp != nil) freeimage(tmp);
+ tmp = allocimage(display, Rect(0, 0, scale * SX, scale > 1 ? 1 : scale * SY), CHAN1(CMap, 1), scale > 1, 0);
+ if(bg != nil) freeimage(bg);
+ bg = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, 0xCCCCCCFF);
+ colbg = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, colbgv);
+ colfg = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, colfgv);
+ draw(screen, screen->r, bg, nil, ZP);
+ updated = Rect(0, 0, SX, SY);
+}
+
+static void
+redraw(void)
+{+ static uchar pic[SX*SY/8];
+ ushort *p;
+ uchar *q;
+ int o, n;
+ Mouse m;
+ Rectangle r;
+
+ if(nbrecvul(mc->resizec) > 0){+ if(getwindow(display, Refnone) < 0)
+ sysfatal("resize failed: %r");+ screeninit();
+ }
+ while(nbrecv(mc->c, &m) > 0){+ if(ptinrect(m.xy, picr)){+ mousex = picr.max.x - m.xy.x - 1;
+ mousey = picr.max.y - m.xy.y - 1;
+ }
+ n = m.buttons >> 2 & 1 | m.buttons & 2 | m.buttons << 2 & 4;
+ if(n != mousebut){+ mousebut = n;
+ irq |= INTMOUSE;
+ }
+ }
+
+ if(Dy(updated) <= 0 || Dx(updated) <= 0)
+ return;
+
+ assert(daddr + sizeof(pic) <= sizeof(ram));
+
+ r = tmp->r;
+ if(updated.min.y > r.min.y)
+ r.min.y = updated.min.y;
+ if(updated.max.y < r.max.y)
+ r.max.y = updated.max.y;
+
+ o = r.min.y*(SX/8);
+ p = ram + (daddr + o) / 2;
+ q = pic + o;
+ for(n = Dy(r)*(SX/16); --n >= 0; ){+ *q++ = invert ^ *p >> 8;
+ *q++ = invert ^ *p++;
+ }
+
+ loadimage(tmp, r, pic+o, Dy(r)*(SX/8));
+ if(realcolors){+ draw(screen, rectaddpt(r, picr.min), colfg, nil, r.min);
+ draw(screen, rectaddpt(r, picr.min), colbg, tmp, r.min);
+ }else
+ draw(screen, rectaddpt(r, picr.min), tmp, nil, r.min);
+ updated = Rect(SX, SY, 0, 0);
+ flushimage(display, 1);
+}
+
+static uchar
+keymap[] = {+ [Kup-KF] 0xf1,
+ [Kdown-KF] 0xf2,
+ [Kleft-KF] 0xf3,
+ [Kright-KF] 0xf4,
+ [1] 0xf6, /* PF1 */
+ [2] 0xf7, /* PF2 */
+ [3] 0xf8, /* PF3 */
+ [4] 0xf9, /* PF4 */
+ [12] 0xfe, /* SET-UP */
+ [Kpgdown-KF] 0xb0, /* SCROLL */
+ [Kins-KF] 0xe0, /* BREAK */
+};
+
+static void
+keyproc(void *)
+{+ int fd, cfd, ch, rc;
+ static char buf[256];
+ char *p;
+ Rune r;
+
+ fd = open("/dev/cons", OREAD);+ if(fd < 0)
+ sysfatal("open: %r");+ cfd = open("/dev/consctl", OWRITE);+ if(cfd < 0)
+ sysfatal("open: %r");+ fprint(cfd, "rawon");
+ for(;;){+ rc = read(fd, buf, sizeof(buf) - 1);
+ if(rc <= 0)
+ sysfatal("read /dev/cons: %r");+ for(p = buf; p < buf + rc && (p += chartorune(&r, p)); ){+ if(r == Kend){+ close(fd);
+ threadexitsall(nil);
+ }
+ ch = r;
+ if(ch == '\n') ch = '\r';
+ else if(ch >= KF){+ if(ch >= KF + nelem(keymap)) continue;
+ ch = keymap[ch - KF];
+ if(ch == 0) continue;
+ }else if(ch >= 0x80) continue;
+ send(keych, &ch);
+ }
+ }
+}
+
+void
+usage(void)
+{+ fprint(2, "usage: %s [-b baud] [-C bg,fg] [-d] [-t [net!]host[!service]]\n", argv0);
+ threadexitsall("usage");+}
+
+void
+threadmain(int argc, char **argv)
+{+ int n;
+ static Cursor blank;
+ char *telnet;
+ char *p;
+ extern int diag;
+
+ telnet = nil;
+ ARGBEGIN{+ case 'b':
+ baud = strtol(EARGF(usage()), &p, 0);
+ if(*p != 0) usage();
+ break;
+ case 't':
+ telnet = EARGF(usage());
+ break;
+ case 'C':
+ if(realcolors) usage();
+ realcolors++;
+ p = EARGF(usage());
+ colbgv = strtol(p, &p, 16) << 8 | 0xff;
+ if(*p++ != ',') usage();
+ colfgv = strtol(p, &p, 16) << 8 | 0xff;
+ if(*p != 0) usage();
+ break;
+ case 'd':
+ diag++;
+ break;
+ default: usage();
+ }ARGEND;
+ if(argc != 0) usage();
+
+ keych = chancreate(sizeof(int), 64);
+ uartrxch = chancreate(sizeof(int), 128);
+ uarttxch = chancreate(sizeof(int), 128);
+ if(telnet != nil) telnetinit(telnet);
+ meminit();
+ if(initdraw(nil, nil, nil) < 0)
+ sysfatal("initdraw: %r");+
+ screeninit();
+ proccreate(keyproc, nil, mainstacksize);
+ mc = initmouse(nil, screen);
+ if(mc == nil)
+ sysfatal("initmouse: %r");+ setcursor(mc, &blank);
+
+ cpureset();
+ for(;;){+ keycheck();
+ n = step();
+ vblctr += n;
+ if(vblctr >= VBLDIV){+ irq |= INTVBL;
+ redraw();
+ vblctr -= VBLDIV;
+ }
+ if(uartrxctr > 0)
+ uartrxctr -= n;
+ }
+}
--- /dev/null
+++ b/sys/src/games/blit/cpu.c
@@ -1,0 +1,1184 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include "dat.h"
+#include "fns.h"
+
+enum {+ FLAGS = 1<<13,
+ FLAGX = 16,
+ FLAGN = 8,
+ FLAGZ = 4,
+ FLAGV = 2,
+ FLAGC = 1,
+};
+
+u32int r[16], pc, curpc;
+u32int asp, irq, stop;
+extern u32int irql[8];
+u32int irqla[8];
+u16int rS;
+static u32int op;
+int trace, tim;
+#define ra (r+8)
+
+static void
+undef(void)
+{+ sysfatal("undefined opcode %#o at pc=%#.6x", op, curpc);+}
+
+static u16int
+fetch16(void)
+{+ u16int v;
+
+ v = memread(pc);
+ pc += 2;
+ return v;
+}
+
+static u32int
+fetch32(void)
+{+ u32int v;
+
+ v = fetch16() << 16;
+ return v | fetch16();
+}
+
+static void
+push16(u16int u)
+{+ ra[7] -= 2;
+ memwrite(ra[7], u, -1);
+}
+
+static u16int
+pop16(void)
+{+ u16int v;
+
+ v = memread(ra[7]);
+ ra[7] += 2;
+ return v;
+}
+
+static void
+push32(u32int u)
+{+ ra[7] -= 4;
+ memwrite(ra[7], u >> 16, -1);
+ memwrite(ra[7] + 2, u, -1);
+}
+
+static u32int
+pop32(void)
+{+ u32int v;
+ v = memread(ra[7]) << 16;
+ v |= memread(ra[7] + 2);
+ ra[7] += 4;
+ return v;
+}
+
+static vlong
+amode(int m, int n, int s)
+{+ u16int w;
+ u32int v;
+
+ m &= 7;
+ n &= 7;
+ s &= 3;
+ if(n == 7 && s == 0)
+ s++;
+ switch(m){+ case 0:
+ return ~n;
+ case 1:
+ return ~(n+8);
+ case 2:
+ tim += s == 2 ? 8 : 4;
+ return ra[n];
+ case 3:
+ v = ra[n];
+ ra[n] += 1<<s;
+ tim += s == 2 ? 8 : 4;
+ return v;
+ case 4:
+ tim += s == 2 ? 10 : 6;
+ return ra[n] -= 1<<s;
+ case 5:
+ tim += s == 2 ? 12 : 8;
+ return (u32int)(ra[n] + (s16int)fetch16());
+ case 6:
+ tim += s == 2 ? 14 : 10;
+ w = fetch16();
+ v = r[w >> 12];
+ if((w & 1<<11) == 0)
+ v = (s16int)v;
+ return (u32int)(ra[n] + v + (s8int)w);
+ case 7:
+ switch(n){+ case 0:
+ tim += s == 2 ? 12 : 8;
+ return (u32int)(s16int)fetch16();
+ case 1:
+ tim += s == 2 ? 16 : 12;
+ return fetch32();
+ case 2:
+ tim += s == 2 ? 12 : 8;
+ v = fetch16();
+ return (u32int)(pc + (s16int)v - 2);
+ case 3:
+ tim += s == 2 ? 14 : 4;
+ w = fetch16();
+ v = r[w >> 12];
+ if((w & 1<<11) == 0)
+ v = (s16int)v;
+ return (u32int)(pc + v + (s8int)w - 2);
+ case 4:
+ tim += s == 2 ? 8 : 4;
+ v = pc;
+ pc += 1<<s;
+ if(s == 0)
+ v = pc++;
+ return v;
+ default:
+ undef();
+ }
+ default:
+ undef();
+ }
+ return 0;
+}
+
+static u32int
+rmode(vlong a, int s)
+{+ u32int v;
+
+ if(a >= 0){+ switch(s & 3){+ case 0:
+ v = memread(a);
+ if((a & 1) == 0)
+ v >>= 8;
+ return (s8int) v;
+ default:
+ return (s16int) memread(a);
+ case 2:
+ v = memread(a) << 16;
+ return v | memread(a + 2);
+ }
+ }
+ v = r[~a];
+ switch(s & 3){+ case 0: return (s8int) v;
+ case 1: return (s16int) v;
+ default: return v;
+ }
+}
+
+static void
+wmode(vlong a, int s, u32int v)
+{+ int n;
+
+ if(a >= 0){+ switch(s & 3){+ case 0:
+ memwrite(a, (u8int)v | (u8int)v << 8, (a & 1) != 0 ? 0xff : 0xff00);
+ return;
+ default:
+ memwrite(a, v, -1);
+ return;
+ case 2:
+ memwrite(a, v >> 16, -1);
+ memwrite(a + 2, v, -1);
+ return;
+ }
+ }
+ n = ~a;
+ if(n < 8){+ switch(s){+ case 0: r[n] = r[n] & 0xffffff00 | v & 0xff; break;
+ case 1: r[n] = r[n] & 0xffff0000 | v & 0xffff; break;
+ default: r[n] = v;
+ }
+ }else{+ if(s == 1)
+ v = (s16int) v;
+ r[n] = v;
+ }
+}
+
+static void
+nz(u32int v, int s)
+{+ switch(s){+ case 0: v = (s8int) v; break;
+ case 1: v = (s16int) v; break;
+ }
+ rS &= ~(FLAGC|FLAGN|FLAGV|FLAGZ);
+ if(v == 0)
+ rS |= FLAGZ;
+ if((s32int)v < 0)
+ rS |= FLAGN;
+}
+
+static u32int
+add(u32int u, u32int w, int c, int s)
+{+ u64int v;
+
+ rS &= ~(FLAGN|FLAGV|FLAGC);
+ switch(s){+ case 0:
+ v = (u8int)w + (u8int)u + c;
+ if(v >= 0x100)
+ rS |= FLAGC;
+ if((v & 0x80) != 0)
+ rS |= FLAGN;
+ if((~(w ^ u) & (v ^ u) & 0x80) != 0)
+ rS |= FLAGV;
+ if((u8int)v != 0)
+ rS &= ~FLAGZ;
+ break;
+ case 1:
+ v = (u16int)w + (u16int)u + c;
+ if(v >= 0x10000)
+ rS |= FLAGC;
+ if((v & 0x8000) != 0)
+ rS |= FLAGN;
+ if((~(w ^ u) & (v ^ u) & 0x8000) != 0)
+ rS |= FLAGV;
+ if((u16int)v != 0)
+ rS &= ~FLAGZ;
+ break;
+ default:
+ v = (u64int)w + u + c;
+ if((v >> 32) != 0)
+ rS |= FLAGC;
+ if((v & 0x80000000) != 0)
+ rS |= FLAGN;
+ if((~(w ^ u) & (v ^ u) & 0x80000000) != 0)
+ rS |= FLAGV;
+ if((u32int)v != 0)
+ rS &= ~FLAGZ;
+ break;
+ }
+ return v;
+}
+
+static u32int
+sub(u32int u, u32int w, int c, int s)
+{+ u64int v;
+
+ rS &= ~(FLAGN|FLAGV|FLAGC);
+ switch(s){+ case 0:
+ v = (u8int)u - (u8int)w - c;
+ if(v >= 0x100)
+ rS |= FLAGC;
+ if((v & 0x80) != 0)
+ rS |= FLAGN;
+ if(((w ^ u) & (v ^ u) & 0x80) != 0)
+ rS |= FLAGV;
+ if((u8int)v != 0)
+ rS &= ~FLAGZ;
+ break;
+ case 1:
+ v = (u16int)u - (u16int)w - c;
+ if(v >= 0x10000)
+ rS |= FLAGC;
+ if((v & 0x8000) != 0)
+ rS |= FLAGN;
+ if(((w ^ u) & (v ^ u) & 0x8000) != 0)
+ rS |= FLAGV;
+ if((u16int)v != 0)
+ rS &= ~FLAGZ;
+ break;
+ default:
+ v = (u64int)u - w - c;
+ if((v >> 32) != 0)
+ rS |= FLAGC;
+ if((v & 0x80000000) != 0)
+ rS |= FLAGN;
+ if(((w ^ u) & (v ^ u) & (1<<31)) != 0)
+ rS |= FLAGV;
+ if((u32int)v != 0)
+ rS &= ~FLAGZ;
+ break;
+ }
+ return v;
+}
+
+static int
+cond(int n)
+{+ switch(n){+ case 0: return 1; break;
+ default: return 0; break;
+ case 2: return (rS & (FLAGC|FLAGZ)) == 0; break;
+ case 3: return (rS & (FLAGC|FLAGZ)) != 0; break;
+ case 4: return (rS & FLAGC) == 0; break;
+ case 5: return (rS & FLAGC) != 0; break;
+ case 6: return (rS & FLAGZ) == 0; break;
+ case 7: return (rS & FLAGZ) != 0; break;
+ case 8: return (rS & FLAGV) == 0; break;
+ case 9: return (rS & FLAGV) != 0; break;
+ case 10: return (rS & FLAGN) == 0; break;
+ case 11: return (rS & FLAGN) != 0; break;
+ case 12: return ((rS ^ (rS << 2)) & FLAGN) == 0; break;
+ case 13: return ((rS ^ (rS << 2)) & FLAGN) != 0; break;
+ case 14: return ((rS ^ (rS << 2)) & FLAGN) == 0 && (rS & FLAGZ) == 0; break;
+ case 15: return ((rS ^ (rS << 2)) & FLAGN) != 0 || (rS & FLAGZ) != 0; break;
+ }
+}
+
+static u32int
+rot(u32int v, int m, int n, int s)
+{+ int l, ll, x, vf;
+ u32int msb;
+
+ msb = 1 << ((8 << s) - 1);
+ v &= (msb << 1) - 1;
+ if(m == 0)
+ x = (v & msb) != 0;
+ else
+ x = 0;
+ if((m & 6) == 4)
+ ll = l = (rS & FLAGX) != 0;
+ else
+ ll = l = 0;
+ vf = 0;
+ while(n--){+ if((m & 1) == 0){+ l = v & 1;
+ v >>= 1;
+ }else{+ l = (v & msb) != 0;
+ v <<= 1;
+ }
+ rS = rS & ~FLAGX | l << 4;
+ if(m >= 6)
+ x = l;
+ else if(m >= 4){+ x = ll;
+ ll = l;
+ }
+ if((m & 1) == 0){+ if(x != 0)
+ v |= msb;
+ }else
+ v |= x;
+ vf |= x ^ (v & msb) != 0;
+ tim += 2;
+ }
+ nz(v, s);
+ rS |= l;
+ if(m <= 1 && vf)
+ rS |= FLAGV;
+ tim += s == 2 ? 8 : 6;
+ return v;
+}
+
+static u8int
+addbcd(u8int a, u8int b)
+{+ int r;
+
+ r = (a & 0xf) + (b & 0xf) + ((rS & FLAGX) != 0);
+ if(r > 0x09) r += 0x06;
+ if(r > 0x1f) r -= 0x10;
+ r += (a & 0xf0) + (b & 0xf0);
+ if(r > 0x9f) r += 0x60;
+ if((u8int)r != 0)
+ rS &= ~FLAGZ;
+ if(r > 0xff)
+ rS |= FLAGC|FLAGX;
+ else
+ rS &= ~(FLAGC|FLAGX);
+ return r;
+}
+
+static u8int
+subbcd(u8int a, u8int b)
+{+ int x;
+
+ x = (a & 0xf) + (~b & 0xf) + ((rS & FLAGX) == 0);
+ if(x < 0x10) x -= 0x06;
+ if(x < 0) x += 0x10;
+ x += (a & 0xf0) + (~b & 0xf0);
+ if(x > 0xff)
+ rS &= ~(FLAGC|FLAGX);
+ else{+ rS |= FLAGC|FLAGX;
+ x -= 0x60;
+ }
+ if((u8int)x != 0)
+ rS &= ~FLAGZ;
+ return x;
+}
+
+static void
+dtime(u16int op, u8int s)
+{+ if((op & 0x100) != 0){+ if(s == 2)
+ if((op & 0x30) == 0 || (op & 0x3f) == 0x3c)
+ tim += 8;
+ else
+ tim += 6;
+ else
+ tim += 4;
+ }else
+ tim += s == 2 ? 12 : 8;
+}
+
+static void
+stime(int a, u8int s)
+{+ if(a)
+ tim += s == 2 ? 6 : 4;
+ else
+ tim += s == 2 ? 12 : 8;
+}
+
+static void
+trap(int n, u32int pcv)
+{+ int l, v;
+ u32int sr, t;
+
+ sr = rS;
+ if(n < 0){+ for(l = 7; l > ((rS >> 8) & 7); l--)
+ if((irql[l] & irq) != 0)
+ break;
+ v = intack(l);
+ rS = rS & ~0x700 | l << 8;
+ tim += 44;
+ }else{+ switch(n){+ case 2: case 3: tim += 50; break;
+ case 5: tim += 38; break;
+ case 6: tim += 40; break;
+ default: tim += 34; break;
+ }
+ v = n;
+ }
+ if((rS & FLAGS) == 0){+ t = asp;
+ asp = ra[7];
+ ra[7] = t;
+ }
+ rS |= FLAGS;
+ push32(pcv);
+ push16(sr);
+ pc = memread(v * 4) << 16;
+ pc |= memread(v * 4 + 2);
+ stop = 0;
+}
+
+void
+cpureset(void)
+{+ u32int v;
+ int i;
+
+ ra[7] = memread(0) << 16 | memread(2);
+ pc = memread(4) << 16 | memread(6);
+ rS = 0x2700;
+ for(i = 7, v = 0; i >= 0; i--){+ irqla[i] = v;
+ v |= irql[i];
+ }
+}
+
+int
+step(void)
+{+ u32int v, w;
+ vlong a;
+ int s;
+ int n, m, d;
+ static int cnt;
+
+ if(0 && pc == 0x4118c){+ trace++;
+ print("%x\n", curpc);+ }
+ tim = 0;
+ curpc = pc;
+ if(irq && (irqla[(rS >> 8) & 7] & irq) != 0){+ trap(-1, curpc);
+ return tim;
+ }
+ if(stop)
+ return 1;
+ op = fetch16();
+ if(trace)
+ print("%.6ux %.6uo %.4ux %.8ux | %.8ux %.8ux %.8ux %.8ux | %.8ux %.8ux %.8ux\n", curpc, op, rS, memread(ra[7])<<16|memread(ra[7]+2), r[0], r[1], r[2], r[3], ra[0], ra[6], ra[7]);+ s = op >> 6 & 3;
+ n = op >> 9 & 7;
+ switch(op >> 12){+ case 0:
+ if((op & 0x3f) == 0x3c){ /* (ORI|ANDI|EORI) to (CCR|SR) */+ if(s == 1 && (rS & FLAGS) == 0){+ trap(8, curpc);
+ break;
+ }
+ v = rS;
+ w = fetch16();
+ switch(n){+ case 0: v |= w; break;
+ case 1: v &= w; break;
+ case 5: v ^= w; break;
+ default: undef();
+ }
+ if(s != 1)
+ v = v & 0xff | rS & 0xff00;
+ rS = v;
+ if(s == 1 && (rS & FLAGS) == 0){+ v = ra[7];
+ ra[7] = asp;
+ asp = v;
+ }
+ tim += 20;
+ break;
+ }
+ if((op & 0x138) == 0x108){ /* MOVEP */+ a = ra[op & 7] + (s16int)fetch16();
+ switch(s){+ case 0:
+ v = (u8int)rmode(a, 0) << 8;
+ v |= (u8int)rmode(a + 2, 0);
+ r[n] = r[n] & 0xff00 | v;
+ tim += 16;
+ break;
+ case 1:
+ v = (u8int)rmode(a, 0) << 24;
+ v |= (u8int)rmode(a + 2, 0) << 16;
+ v |= (u8int)rmode(a + 4, 0) << 8;
+ v |= (u8int)rmode(a + 6, 0);
+ tim += 24;
+ r[n] = v;
+ break;
+ case 2:
+ wmode(a, 0, r[n] >> 8);
+ wmode(a + 2, 0, r[n]);
+ tim += 16;
+ break;
+ case 3:
+ wmode(a, 0, r[n] >> 24);
+ wmode(a + 2, 0, r[n] >> 16);
+ wmode(a + 4, 0, r[n] >> 8);
+ wmode(a + 6, 0, r[n]);
+ tim += 24;
+ break;
+ }
+ break;
+ }
+ if((op & 0x100) != 0 || n == 4){ /* BTST, BCHG, BCLR, BSET */+ if((op & 0x100) != 0)
+ w = r[n];
+ else
+ w = fetch16();
+ if((op & 0x38) != 0){+ n = 0;
+ w = 1<<(w & 7);
+ }else{+ n = 2;
+ w = 1<<(w & 31);
+ }
+ a = amode(op >> 3, op, n);
+ v = rmode(a, n);
+ rS &= ~FLAGZ;
+ if((v & w) == 0)
+ rS |= FLAGZ;
+ switch(s){+ case 1: v ^= w; break;
+ case 2: v &= ~w; if(n == 2) tim += 2; break;
+ case 3: v |= w; break;
+ }
+ if(s != 0){+ wmode(a, n, v);
+ tim += (op & 0x100) != 0 ? 8 : 12;
+ }else{+ tim += (op & 0x100) != 0 ? 4 : 8;
+ if(n == 2)
+ tim += 2;
+ }
+ break;
+ }
+ switch(s){+ case 0: w = (s8int)fetch16(); break;
+ default: w = fetch16(); break;
+ case 2: w = fetch32(); break;
+ }
+ a = amode(op >> 3, op, s);
+ v = rmode(a, s);
+ switch(n){+ case 0: nz(v |= w, s); break;
+ case 1: nz(v &= w, s); break;
+ case 2: rS |= FLAGZ; v = sub(v, w, 0, s); break;
+ case 3: rS |= FLAGZ; v = add(v, w, 0, s); break;
+ case 5: nz(v ^= w, s); break;
+ case 6: rS |= FLAGZ; sub(v, w, 0, s); break;
+ default: undef();
+ }
+ if(a < 0)
+ tim += s == 2 ? (n == 1 || n == 6 ? 14 : 16) : 8;
+ else
+ tim += s == 2 ? 20 : 12;
+ if(n != 6)
+ wmode(a, s, v);
+ break;
+ case 1: /* MOVE */
+ s = 0;
+ goto move;
+ case 2:
+ s = 2;
+ goto move;
+ case 3:
+ s = 1;
+ move:
+ v = rmode(amode(op >> 3, op, s), s);
+ wmode(amode(op >> 6, op >> 9, s), s, v);
+ if((op & 0x1c0) != 0x40)
+ nz(v, s);
+ tim += 4;
+ break;
+ case 4:
+ if((op & 0x1c0) == 0x1c0){ /* LEA */+ ra[n] = amode(op >> 3, op, 2);
+ break;
+ }
+ if((op & 0x1c0) == 0x180){ /* CHK */+ a = amode(op >> 3, op, s);
+ v = rmode(a, s);
+ if((s32int)r[n] < 0 || (s32int)r[n] > (s32int)v)
+ trap(6, curpc);
+ else
+ tim += 10;
+ }
+ if((op & 0xb80) == 0x880 && (op & 0x38) >= 0x10){ /* MOVEM */+ s = (op >> 6 & 1) + 1;
+ w = fetch16();
+ if((op & 0x38) == 0x18){+ n = op & 7;
+ a = ra[n];
+ for(m = 0; m < 16; m++){+ if((w & 1) != 0){+ r[m] = rmode(a, s);
+ a += 1<<s;
+ tim += 2<<s;
+ }
+ w >>= 1;
+ }
+ ra[n] = a;
+ tim += 12;
+ break;
+ }
+ if((op & 0x38) == 0x20){+ n = op & 7;
+ a = ra[n];
+ for(m = 0; m < 16; m++){+ if((w & 1) != 0){+ a -= 1<<s;
+ wmode(a, s, r[15 - m]);
+ tim += 2<<s;
+ }
+ w >>= 1;
+ }
+ ra[n] = a;
+ tim += 8;
+ break;
+ }
+ a = amode(op >> 3, op, s);
+ for(m = 0; m < 16; m++){+ if((w & 1) != 0){+ if((op & 0x400) != 0)
+ r[m] = rmode(a, s);
+ else
+ wmode(a, s, r[m]);
+ a += 1<<s;
+ tim += 2<<s;
+ }
+ w >>= 1;
+ }
+ tim += (op & 0x400) != 0 ? 8 : 12;
+ break;
+ }
+ switch(op >> 8 & 0xf){+ case 0:
+ if(s == 3){ /* MOVE from SR */+ if((rS & FLAGS) != 0){+ a = amode(op >> 3, op, 1);
+ wmode(a, 1, rS);
+ tim += a < 0 ? 6 : 8;
+ }else
+ trap(8, curpc);
+ break;
+ } /* NEGX */
+ a = amode(op >> 3, op, s);
+ m = (rS & FLAGX) != 0;
+ d = 1<<(8<<s)-1;
+ v = rmode(a, s);
+ w = -(v+m) & (d << 1) - 1;
+ rS &= ~(FLAGC|FLAGX|FLAGN|FLAGV);
+ if((w & d) != 0)
+ rS |= FLAGN;
+ if(m && w == d)
+ rS |= FLAGV;
+ if(w != 0){+ rS |= FLAGC|FLAGX;
+ rS &= ~FLAGZ;
+ }
+ wmode(a, s, w);
+ stime(a < 0, s);
+ break;
+ case 2: /* CLR */
+ a = amode(op >> 3, op, s);
+ wmode(a, s, 0);
+ nz(0, 0);
+ stime(a < 0, s);
+ break;
+ case 4:
+ if(s == 3){ /* MOVE to CCR */+ rS = rS & 0xff00 | rmode(amode(op >> 3, op, 1), 1);
+ tim += 12;
+ break;
+ } /* NEG */
+ a = amode(op >> 3, op, s);
+ v = -rmode(a, s);
+ nz(v, s);
+ rS = rS & ~FLAGX | ~rS << 2 & FLAGX | ~rS >> 2 & FLAGC;
+ wmode(a, s, v);
+ stime(a < 0, s);
+ break;
+ case 6:
+ if(s == 3){ /* MOVE to SR */+ if((rS & FLAGS) != 0){+ rS = rmode(amode(op >> 3, op, 1), 1);
+ if((rS & FLAGS) == 0){+ v = asp;
+ asp = ra[7];
+ ra[7] = v;
+ }
+ tim += 12;
+ }else
+ trap(8, curpc);
+ break;
+ } /* NOT */
+ a = amode(op >> 3, op, s);
+ v = ~rmode(a, s);
+ nz(v, s);
+ wmode(a, s, v);
+ stime(a < 0, s);
+ break;
+ case 8:
+ n = op & 7;
+ switch(s){+ case 0: /* NBCD */
+ a = amode(op >> 3, op, 0);
+ v = rmode(a, 0);
+ wmode(a, 0, subbcd(0, v));
+ if(a < 0)
+ tim += 8;
+ else
+ tim += 6;
+ break;
+ case 1:
+ if((op >> 3 & 7) != 0){+ push32(amode(op >> 3, op, 0)); /* PEA */
+ tim += 8;
+ }else{+ nz(r[n] = r[n] >> 16 | r[n] << 16, 2); /* SWAP */
+ tim += 4;
+ }
+ break;
+ case 2: /* EXT */
+ nz(r[n] = r[n] & 0xffff0000 | (u16int)(s8int)r[n], 1);
+ tim += 4;
+ break;
+ case 3: /* EXT */
+ nz(r[n] = (s16int)r[n], 2);
+ tim += 4;
+ break;
+ }
+ break;
+ case 10:
+ if(s == 3){ /* TAS */+ a = amode(op >> 3, op, 0);
+ v = rmode(a, 0);
+ nz(v, 0);
+ wmode(a, s, v | 0x80);
+ tim += a < 0 ? 4 : 14;
+ break;
+ } /* TST */
+ a = amode(op >> 3, op, s);
+ nz(rmode(a, s), s);
+ tim += 4;
+ break;
+ case 14:
+ v = op >> 4 & 0xf;
+ n = op & 7;
+ if(v == 4){ /* TRAP */+ trap(0x20 | op & 0xf, pc);
+ break;
+ }else if(v == 5){+ if((op & 8) == 0){ /* LINK */+ push32(ra[n]);
+ ra[n] = ra[7];
+ ra[7] += (s16int)fetch16();
+ tim += 16;
+ }else{ /* UNLK */+ ra[7] = ra[n];
+ ra[n] = pop32();
+ tim += 12;
+ }
+ break;
+ }else if(v == 6){ /* MOVE USP */+ if((rS & FLAGS) != 0){+ if((op & 8) != 0)
+ ra[n] = asp;
+ else
+ asp = ra[n];
+ tim += 4;
+ }else
+ trap(8, curpc);
+ break;
+ }
+ if((op & 0xc0) == 0xc0){ /* JMP */+ pc = amode(op >> 3, op, 2);
+ tim += 4;
+ break;
+ }
+ if((op & 0xc0) == 0x80){ /* JSR */+ a = amode(op >> 3, op, 2);
+ push32(pc);
+ pc = a;
+ tim += 12;
+ break;
+ }
+ switch(op){+ case 0x4e70: tim += 132; break; /* RESET */
+ case 0x4e71: tim += 4; break; /* NOP */
+ case 0x4e72: /* STOP */
+ if((rS & FLAGS) != 0){+ rS = fetch16();
+ stop = 1;
+ }else
+ trap(8, curpc);
+ tim += 4;
+ break;
+ case 0x4e73: /* RTE */
+ if((rS & FLAGS) != 0){+ v = rS;
+ rS = pop16();
+ pc = pop32();
+ if(((v ^ rS) & FLAGS) != 0){+ v = asp;
+ asp = ra[7];
+ ra[7] = v;
+ }
+ tim += 20;
+ }else
+ trap(8, curpc);
+ break;
+ case 0x4e75: pc = pop32(); tim += 16; break; /* RTS */
+ case 0x4e76: if((rS & FLAGV) != 0) trap(7, curpc); tim += 4; break; /* TRAPV */
+ case 0x4e77: /* RTR */
+ rS = rS & 0xff00 | pop16() & 0xff;
+ pc = pop32();
+ tim += 20;
+ break;
+ default: undef();
+ }
+ break;
+ default:
+ undef();
+ }
+ break;
+ case 5:
+ if((op & 0xf8) == 0xc8){ /* DBcc */+ n = op & 7;
+ v = (s16int)fetch16();
+ if(!cond((op >> 8) & 0xf)){+ if((u16int)r[n] != 0){+ r[n]--;
+ pc = pc + v - 2;
+ tim += 10;
+ }else{+ r[n] |= 0xffff;
+ tim += 14;
+ }
+ }else
+ tim += 12;
+ break;
+ }
+ if(s == 3){ /* Scc */+ a = amode(op >> 3, op, 0);
+ v = cond(op >> 8 & 0xf);
+ wmode(a, 0, -v);
+ if(a < 0)
+ tim += 4 + 2 * v;
+ else
+ tim += 8;
+ break;
+ } /* ADDQ, SUBQ */
+ rS |= FLAGZ;
+ if((op & 0x38) == 0x08)
+ s = 2;
+ a = amode(op >> 3, op, s);
+ v = rmode(a, s);
+ if(n == 0)
+ n = 8;
+ if((op & 0x100) == 0)
+ v = add(v, n, 0, s);
+ else
+ v = sub(v, n, 0, s);
+ rS = rS & ~FLAGX | rS << 4 & FLAGX;
+ if(a < 0)
+ tim += s == 2 || (op & 0x130) == 0x110 ? 8 : 4;
+ else
+ tim += s == 2 ? 12 : 8;
+ wmode(a, s, v);
+ break;
+ case 6: /* BRA */
+ v = (s8int)op;
+ if(v == 0)
+ v = (s16int)fetch16();
+ else if(v == (u32int)-1)
+ v = fetch32();
+ if((op & 0xf00) == 0x100){ /* BSR */+ push32(pc);
+ pc = curpc + 2 + v;
+ tim += 18;
+ break;
+ }
+ if(cond((op >> 8) & 0xf)){+ pc = curpc + 2 + v;
+ tim += 10;
+ }else
+ tim += (u8int)(op + 1) <= 1 ? 12 : 8;
+ break;
+ case 7: /* MOVEQ */
+ r[n] = (s8int)op;
+ nz(r[n], 0);
+ tim += 4;
+ break;
+ case 8:
+ if(s == 3){ /* DIVU, DIVS */+ a = amode(op >> 3, op, 1);
+ v = rmode(a, 1);
+ if(v == 0){+ trap(5, curpc);
+ break;
+ }
+ if((op & 0x100) != 0){+ w = (s32int)r[n] % (s16int)v;
+ v = (s32int)r[n] / (s16int)v;
+ if(((s16int)w ^ (s16int)v) < 0)
+ w = -w;
+ if(v != (u32int)(s16int)v){+ rS = rS & ~FLAGC | FLAGV;
+ break;
+ }
+ tim += 158;
+ }else{+ w = r[n] % (u16int)v;
+ v = r[n] / (u16int)v;
+ if(v >= 0x10000){+ rS = rS & ~FLAGC | FLAGV;
+ break;
+ }
+ tim += 140;
+ }
+ r[n] = (u16int)v | w << 16;
+ nz(v, 1);
+ break;
+ }
+ if((op & 0x1f0) == 0x100){ /* SBCD */+ n = (op >> 9) & 7;
+ m = op & 7;
+ if((op & 8) != 0){+ a = amode(4, n, 0);
+ v = rmode(a, 0);
+ w = rmode(amode(4, m, 0), 0);
+ v = subbcd(v, w);
+ wmode(a, 0, v);
+ tim += 18;
+ }else{+ r[n] = r[n] & 0xffffff00 | subbcd((u8int)r[n], (u8int)r[m]);
+ tim += 6;
+ }
+ break;
+ }
+ logic: /* OR, EOR, AND */
+ a = amode(op >> 3, op, s);
+ n = (op >> 9) & 7;
+ v = rmode(a, s);
+ switch(op >> 12){+ case 8: v |= r[n]; break;
+ case 11: v ^= r[n]; break;
+ case 12: v &= r[n]; break;
+ }
+ if((op & 0x100) == 0)
+ a = ~n;
+ wmode(a, s, v);
+ nz(v, s);
+ dtime(op, s);
+ break;
+ case 11:
+ if(s == 3){ /* CMPA */+ s = (op >> 8 & 1) + 1;
+ a = amode(op >> 3, op, s);
+ rS |= FLAGZ;
+ sub(ra[n], rmode(a, s), 0, 2);
+ tim += 6;
+ break;
+ }
+ if((op & 0x138) == 0x108){ /* CMPM */+ m = op & 7;
+ rS |= FLAGZ;
+ sub(rmode(amode(3, n, s), s), rmode(amode(3, m, s), s), 0, s);
+ tim += s == 2 ? 20 : 12;
+ break;
+ }
+ if((op & 0x100) == 0){ /* CMP */+ a = amode(op >> 3, op, s);
+ rS |= FLAGZ;
+ sub(r[n], rmode(a, s), 0, s);
+ tim += s == 2 ? 6 : 4;
+ break;
+ }
+ goto logic;
+ case 12:
+ if(s == 3){ /* MULU, MULS */+ a = amode(op >> 3, op, 1);
+ v = rmode(a, 1);
+ if((op & 0x100) != 0)
+ v *= (s16int)r[n];
+ else
+ v = (u16int)v * (u16int)r[n];
+ r[n] = v;
+ nz(v, 1);
+ tim += 70;
+ break;
+ }
+ if((op & 0x1f0) == 0x100){ /* ABCD */+ n = (op >> 9) & 7;
+ m = op & 7;
+ if((op & 8) != 0){+ a = amode(4, n, 0);
+ v = rmode(a, 0);
+ w = rmode(amode(4, m, 0), 0);
+ v = addbcd(v, w);
+ wmode(a, 0, v);
+ tim += 18;
+ }else{+ r[n] = r[n] & 0xffffff00 | addbcd((u8int)r[n], (u8int)r[m]);
+ tim += 6;
+ }
+ break;
+
+ }
+ if((op & 0x130) == 0x100){ /* EXG */+ m = op & 0xf;
+ if((op & 0xc8) == 0x48)
+ n |= 8;
+ v = r[n];
+ r[n] = r[m];
+ r[m] = v;
+ tim += 6;
+ break;
+ }
+ goto logic;
+ case 9:
+ case 13:
+ if(s == 3){ /* ADDA, SUBA */+ if((op & 0x100) != 0){+ s = 2;
+ tim += 6;
+ }else{+ s = 1;
+ tim += 8;
+ }
+ a = amode(op >> 3, op, s);
+ if((op >> 12) == 13)
+ ra[n] += rmode(a, s);
+ else
+ ra[n] -= rmode(a, s);
+ break;
+ }
+ if((op & 0x130) == 0x100){ /* ADDX, SUBX */+ m = op & 7;
+ if((op & 8) != 0){+ a = ra[n] -= 1<<s;
+ v = rmode(a, s);
+ w = rmode(ra[m] -= 1<<s, s);
+ tim += s == 2 ? 30 : 18;
+ }else{+ v = r[n];
+ w = r[m];
+ a = ~n;
+ tim += s == 2 ? 8 : 4;
+ }
+ if((op >> 12) == 13)
+ v = add(v, w, (rS & FLAGX) != 0, s);
+ else
+ v = sub(v, w, (rS & FLAGX) != 0, s);
+ wmode(a, s, v);
+ rS = rS & ~FLAGX | rS << 4 & FLAGX;
+ break;
+ } /* ADD, SUB */
+ a = amode(op >> 3, op, s);
+ rS |= FLAGZ;
+ d = (op & 0x100) == 0;
+ v = rmode(a, s);
+ if((op >> 12) == 13)
+ v = add(v, r[n], 0, s);
+ else
+ v = sub(d ? r[n] : v, d ? v : r[n], 0, s);
+ rS = rS & ~FLAGX | rS << 4 & FLAGX;
+ if(d)
+ a = ~n;
+ wmode(a, s, v);
+ dtime(op, s);
+ break;
+ case 14: /* shifts */
+ if(s == 3){+ m = op >> 8 & 7;
+ n = 1;
+ s = 1;
+ a = amode(op >> 3, op, s);
+ }else{+ a = ~(uvlong)(op & 7);
+ m = op >> 2 & 6 | op >> 8 & 1;
+ n = (op >> 9) & 7;
+ if((op & 0x20) != 0)
+ n = r[n] & 63;
+ else if(n == 0)
+ n = 8;
+ }
+ wmode(a, s, rot(rmode(a, s), m, n, s));
+ break;
+ case 10:
+ trap(10, curpc);
+ break;
+ case 15:
+ trap(11, curpc);
+ break;
+ default:
+ undef();
+ }
+ return tim;
+}
--- /dev/null
+++ b/sys/src/games/blit/dat.h
@@ -1,0 +1,31 @@
+typedef signed char s8int;
+typedef signed short s16int;
+typedef signed long s32int;
+
+extern u32int curpc, irq;
+extern int trace, debug;
+
+extern ushort ram[128*1024];
+
+extern int daddr;
+extern ushort dstat;
+extern uchar invert;
+
+extern int mousex, mousey, mousebut;
+
+extern int vblctr, uartrxctr;
+extern int baud;
+
+enum {+ INTKEY = 1,
+ INTMOUSE = 2,
+ INTUART = 4,
+ INTVBL = 8,
+};
+
+enum {+ SX = 800,
+ SY = 1024,
+ FREQ = 8000*1000,
+ VBLDIV = FREQ / 60,
+};
binary files /dev/null b/sys/src/games/blit/diagbits differ
--- /dev/null
+++ b/sys/src/games/blit/fns.h
@@ -1,0 +1,8 @@
+u16int memread(u32int);
+void memwrite(u32int, u16int, u16int);
+int intack(int);
+int step(void);
+void meminit(void);
+void cpureset(void);
+void keycheck(void);
+void telnetinit(char *);
--- /dev/null
+++ b/sys/src/games/blit/mem.c
@@ -1,0 +1,180 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <draw.h>
+#include <bio.h>
+#include <mouse.h>
+#include "dat.h"
+#include "fns.h"
+
+u32int irq;
+u32int irql[8] = {+ [1] INTVBL,
+ [2] INTKEY,
+ [4] INTMOUSE,
+ [5] INTUART,
+};
+int diag;
+
+ushort ram[128*1024];
+ushort rom[3*4096];
+Channel *keych;
+Channel *uartrxch, *uarttxch;
+int mousex, mousey, mousebut;
+
+int yes;
+u8int kbdctrl, uartctrl;
+enum {+ ACIATXMASK = 0x60,
+ ACIATXIRQ = 0x20,
+ ACIARXIRQ = 0x80,
+};
+
+int keybuf = -1;
+int uartrxbuf = -1;
+int uarttxbuf = -1;
+
+void
+meminit(void)
+{+ int i, x;
+ Biobuf *bp;
+ char *s;
+ ushort *p, *q;
+
+ p = rom;
+ if(diag){+ bp = Bopen("diagbits", OREAD);+ if(bp == nil) sysfatal("Bopen: %r");+ Bread(bp, rom, sizeof(rom));
+ Bterm(bp);
+ return;
+ }
+ for(i = 0; i < 6; i++){+ bp = Bopen(smprint("rom%d", i), OREAD);+ if(bp == nil) sysfatal("Bopen: %r");+ q = p;
+ for(;;){+ s = Brdline(bp, '\n');
+ if(s == nil || Blinelen(bp) == 0) break;
+ s[Blinelen(bp) - 1] = 0;
+ x = strtol(s, nil, 8);
+ if((i & 1) != 0)
+ *p |= x << 8;
+ else
+ *p |= x;
+ p++;
+ }
+ if((i & 1) == 0) p = q;
+ Bterm(bp);
+ }
+ write(3, rom, sizeof(rom));
+}
+
+void
+keycheck(void)
+{+ yield();
+
+ if(keybuf < 0)
+ nbrecv(keych, &keybuf);
+ if(keybuf >= 0 && (kbdctrl & ACIARXIRQ) != 0)
+ irq |= INTKEY;
+ else
+ irq &= ~INTKEY;
+
+ if(uartrxbuf < 0 && uartrxctr <= 0){+ nbrecv(uartrxch, &uartrxbuf);
+ uartrxctr = FREQ * 11 / baud;
+ }
+ if(uarttxbuf >= 0 && nbsend(uarttxch, &uarttxbuf) > 0)
+ uarttxbuf = -1;
+ if(uartrxbuf >= 0 && (uartctrl & ACIARXIRQ) != 0 || uarttxbuf < 0 && (uartctrl & ACIATXMASK) == ACIATXIRQ)
+ irq |= INTUART;
+ else
+ irq &= ~INTUART;
+}
+
+u16int
+memread(u32int a)
+{+ int rc;
+
+ a &= 0x3fffff;
+ if(a < 8) a += 0x40000;
+ if(a < 0x40000) return ram[a/2];
+ if(a >= 0x40000 && a < 0x40000 + sizeof(rom))
+ return rom[(a - 0x40000)/2];
+ switch(a & ~1){+ case 01400000: return mousey;
+ case 01400002: return mousex;
+ case 01400010: /* uart status */
+ rc = 0;
+ if(uartrxbuf >= 0) rc |= 1;
+ if(uarttxbuf < 0) rc |= 2;
+ return rc | rc << 8;
+ case 01400012: /* uart data */
+ rc = uartrxbuf;
+ uartrxbuf = -1;
+ yes=1;
+ return rc | rc << 8;
+ case 01400020:
+ case 01400024:
+ irq &= ~INTMOUSE;
+ return mousebut | mousebut << 8;
+ case 01400026: return 0; /* mouse: unknown purpose */
+ case 01400030: return daddr >> 2; /* display address */
+ case 01400040: return dstat; /* display status */
+ case 01400060: /* keyboard status */
+ rc = 2;
+ if(keybuf >= 0) rc |= 1;
+ return rc | rc << 8;
+ case 01400062: /* keyboard data */
+ rc = keybuf;
+ keybuf = -1;
+ return rc | rc << 8;
+ }
+ print("read %.8o (curpc = %.6x)\n", a, curpc & 0x3fffff);+ return 0;
+}
+
+void
+memwrite(u32int a, u16int v, u16int m)
+{+ extern Rectangle updated;
+ int x, y;
+
+ a &= 0x3fffff;
+ if(a < 0x40000){+ if(a >= daddr){+ y = (a - daddr) / 100;
+ x = (((a & ~1) - daddr) % 100) * 8;
+ if(updated.min.x > x) updated.min.x = x;
+ if(updated.max.x < x+16) updated.max.x = x+16;
+ if(updated.min.y > y) updated.min.y = y;
+ if(updated.max.y <= y) updated.max.y = y+1;
+ }
+ ram[a/2] = ram[a/2] & ~m | v & m;
+ return;
+ }
+ switch(a & ~1){+ case 01400010: uartctrl = v; return;
+ case 01400012: uarttxbuf = (uchar) v; return;
+ case 01400024: return; /* mouse: purpose unknown */
+ case 01400026: return; /* mouse: purpose unknown */
+ case 01400030: daddr = ((daddr >> 2) & ~m | v & m) << 2; return;
+ case 01400040: dstat = dstat & ~m | v & m; invert = -(dstat & 1); updated = Rect(0, 0, SX, SY); return;
+ case 01400056: /* sound; exact function unknown */ return;
+ case 01400060: kbdctrl = v; return;
+ case 01400062: /* reset keyboard */ return;
+ case 01400070: irq &= ~INTVBL; return;
+ case 01400156: /* sound; exact function unknown */ return;
+ }
+ print("write %.8o = %.4x (mask = %.4x, curpc = %.6x)\n", a, v, m, curpc & 0x3fffff);+}
+
+int
+intack(int l)
+{+ return 24+l;
+}
--- /dev/null
+++ b/sys/src/games/blit/mkfile
@@ -1,0 +1,12 @@
+</$objtype/mkfile
+
+BIN=/$objtype/bin
+TARG=blit
+HFILES=dat.h fns.h
+OFILES=\
+ blit.$O\
+ cpu.$O\
+ mem.$O\
+ telnet.$O\
+
+</sys/src/cmd/mkone
--- /dev/null
+++ b/sys/src/games/blit/mmap
@@ -1,0 +1,88 @@
+- main CPU is a MC68000 running at 8 MHz.
+ the exact clock speed is most likely one of: 7.9872, 7.68 or 7.3728 MHz (to divide to 19200 baud)
+- display is 800x1024, refreshed at 30 Hz (60 Hz interlaced).
+ it simply displays the 100K framebuffer from the address given in register 030.
+- the host is connected through a UART running at 19200 baud.
+- the keyboard is connected through a UART running at an unknown baudrate.
+- the mouse is connected through some unknown circuitry.
+
+memory map
+
+start end purpose
+0x00000 0x00008 see register 050 below
+0x00008 0x40000 RAM (256K)
+0x40000 ??? ROM (24K ?) (not known if mirrored)
+0x60000 ??? memory mapped I/O
+
+mmio addresses (in *octal*):
+
+0000 16-bit mouse y
+0002 16-bit mouse x
+
+0011 8-bit terminal UART status/control (MC 6850 ACIA)
+0013 8-bit terminal UART data
+ the software uses 2 stop bits, no parity, 8 bits; clock divided by 16
+
+0021 8-bit mouse buttons
+ bit 0: rmb
+ bit 1: mmb
+ bit 2: lmb
+ reading clears the mouse interrupt
+
+0025 8-bit second copy of 0021 (?)
+0027 8-bit ???
+ only the ROM binaries contain references to 0025, 0027 in buttons.c.
+ the corresponding source code appears to have been deleted.
+ possibly some older variant of the button hardware?
+
+0030 16-bit start address of framebuffer divided by 4 (800*1024/8 = 100K bytes)
+0040 16-bit status/control register of display
+ bit 0: invert display
+ with this bit set 0 bits are white and 1 bits are black (most software does this).
+
+0050 16-bit writing different values makes 0-8 either mapped to 0x40000 or error out (details unclear)
+ resets so that they map to the reset vector at 0x40000.
+
+0056 8-bit some kind of sound-making device (standard programmable timer + piezoelectric speaker?)
+0156 referenced by demo pacman.
+0256
+
+0060 8-bit keyboard status/control register (MC 6850 ACIA)
+ the software uses 2 stop bits, no parity, 8 bits; clock divided by 16
+0062 8-bit keyboard data register
+
+0070 16-bit? acknowledge vblank interrupt; software writes 0
+
+tx to the keyboard sets the 7 lights and can also ring the bell.
+could deduce the order of lights from diag.c.
+writing 2 is used to sound the bell.
+
+irq lines; using the 68k autovectoring
+
+vector 1 (0x64) is vblank
+vector 2 (0x68) is keyboard
+vector 4 (0x70) is mouse buttons
+vector 5 (0x74) is uart
+
+MC 6850 bits:
++0 (r) status register
+ bit 0: receive buffer full
+ bit 1: transmit buffer empty
+ bit 2: data carrier detected (inverted)
+ bit 3: clear-to-send (inverted)
+ bit 4: framing error
+ bit 5: receiver overrun
+ bit 6: parity error
+ bit 7: irq active
++0 (w) control register
+ bit 1-0: clock divider
+ 00: /1
+ 01: /16
+ 10: /64
+ 11: master reset
+ bit 4-2: parity and stop bits (see datasheet)
+ bit 6-5:
+ RTS/ is high only if these bits are 10
+ TX interrupts are enabled only if these bits are 01
+ break is transmitted continuously if these bits are 11
+ bit 7: RX interrupt enabled
--- /dev/null
+++ b/sys/src/games/blit/rom0
@@ -1,0 +1,4096 @@
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+++ b/sys/src/games/blit/rom3
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--- /dev/null
+++ b/sys/src/games/blit/telnet.c
@@ -1,0 +1,149 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include "dat.h"
+#include "fns.h"
+
+Channel *telnetrxch, *telnettxch;
+extern Channel *uartrxch, *uarttxch;
+int teldebug;
+
+enum {+ SE = 240,
+ NOP = 241,
+ BRK = 243,
+ IP = 244,
+ AO = 245,
+ AYT = 246,
+ EC = 247,
+ EL = 248,
+ GA = 249,
+ SB = 250,
+ WILL = 251,
+ WONT = 252,
+ DO = 253,
+ DONT = 254,
+ IAC = 255,
+
+ XMITBIN = 0,
+ ECHO = 1,
+ SUPRGA = 3,
+ LINEEDIT = 34,
+
+};
+
+int telfd;
+
+static void
+netrproc(void *)
+{+ static uchar buf[512];
+ int n, c;
+ uchar *p;
+
+ for(;;){+ n = read(telfd, buf, sizeof(buf));
+ if(n < 0) sysfatal("read: %r");+ for(p = buf; p < buf + n; p++){+ c = *p;
+ send(telnetrxch, &c);
+ }
+ }
+}
+
+static void
+netwproc(void *)
+{+ static uchar buf[512];
+ int c;
+ uchar *p;
+
+ for(;;){+ recv(telnettxch, &c);
+ p = buf;
+ do
+ *p++ = c;
+ while(nbrecv(telnettxch, &c) > 0);
+ if(write(telfd, buf, p - buf) < p - buf)
+ sysfatal("write: %r");+ }
+}
+
+static void
+telnetrthread(void *)
+{+ int c;
+
+ for(;;){+ recv(telnetrxch, &c);
+ if(c != IAC){+ send(uartrxch, &c);
+ continue;
+ }
+ recv(telnetrxch, &c);
+ switch(c){+ case NOP: break;
+ case WILL:
+ recv(telnetrxch, &c);
+ if(teldebug) fprint(2, "WILL %d\n", c);
+ break;
+ case WONT:
+ recv(telnetrxch, &c);
+ if(teldebug) fprint(2, "WONT %d\n", c);
+ break;
+ case DO:
+ recv(telnetrxch, &c);
+ if(teldebug) fprint(2, "DO %d\n", c);
+ break;
+ case DONT:
+ recv(telnetrxch, &c);
+ if(teldebug) fprint(2, "DONT %d\n", c);
+ break;
+ case IAC:
+ send(uartrxch, &c);
+ break;
+ default:
+ fprint(2, "unknown telnet command %d\n", c);
+ }
+ }
+}
+
+static void
+cmd(int a, int b)
+{+ send(telnettxch, &a);
+ if(b >= 0) send(telnettxch, &b);
+}
+
+static void
+telnetwthread(void *)
+{+ int c;
+
+ for(;;){+ recv(uarttxch, &c);
+ send(telnettxch, &c);
+ if(c == 0xff)
+ send(telnettxch, &c);
+ }
+}
+
+void
+telnetinit(char *dialstr)
+{+ telfd = dial(netmkaddr(dialstr, nil, "telnet"), nil, nil, nil);
+ if(telfd < 0) sysfatal("dial: %r");+ telnetrxch = chancreate(sizeof(int), 128);
+ telnettxch = chancreate(sizeof(int), 128);
+ cmd(WILL, XMITBIN);
+ cmd(DO, XMITBIN);
+ cmd(DONT, ECHO);
+ cmd(DO, SUPRGA);
+ cmd(WILL, SUPRGA);
+ cmd(WONT, LINEEDIT);
+ cmd(DONT, LINEEDIT);
+ proccreate(netrproc, nil, mainstacksize);
+ proccreate(netwproc, nil, mainstacksize);
+ threadcreate(telnetrthread, nil, mainstacksize);
+ threadcreate(telnetwthread, nil, mainstacksize);
+}
--- a/sys/src/games/mkfile
+++ b/sys/src/games/mkfile
@@ -3,6 +3,7 @@
TARG=4s\
5s\
ana\
+ blit\
catclock\
festoon\
geigerstats\