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-rw-r--r--baremetal/101screen.subx56
-rw-r--r--baremetal/102keyboard.subx3
-rw-r--r--baremetal/103grapheme.subx28
-rw-r--r--baremetal/400.mu8
-rw-r--r--baremetal/500clear-screen.mu17
-rw-r--r--baremetal/500text-screen.mu64
-rw-r--r--baremetal/503manhattan-line.mu18
-rw-r--r--baremetal/ex2.mu2
-rw-r--r--baremetal/ex3.mu2
-rw-r--r--baremetal/ex6.mu2
-rw-r--r--baremetal/mu-init.subx2
11 files changed, 124 insertions, 78 deletions
diff --git a/baremetal/101screen.subx b/baremetal/101screen.subx
index 225efeec..5a26a86a 100644
--- a/baremetal/101screen.subx
+++ b/baremetal/101screen.subx
@@ -1,44 +1,38 @@
 # Primitives for screen control.
+#
+# We need to do this in machine code because Mu doesn't have global variables
+# yet (for the start of video memory).
 
 == code
 
-pixel:  # screen: (addr screen), x: int, y: int, color: int
+pixel-on-real-screen:  # x: int, y: int, color: int
     # . prologue
     55/push-ebp
     89/<- %ebp 4/r32/esp
     # . save registers
     50/push-eax
     51/push-ecx
-    # ecx = screen
-    8b/-> *(ebp+8) 1/r32/ecx
-    81 7/subop/compare %ecx 0/imm32
-    {
-      75/jump-if-!= break/disp8
-      # bounds checks
-      8b/-> *(ebp+0xc) 0/r32/eax
-      3d/compare-eax-and 0/imm32
-      7c/jump-if-< $pixel:end/disp8
-      3d/compare-eax-and 0x400/imm32/1024
-      7d/jump-if->= $pixel:end/disp8
-      8b/-> *(ebp+0x10) 0/r32/eax
-      3d/compare-eax-and 0/imm32
-      7c/jump-if-< $pixel:end/disp8
-      3d/compare-eax-and 0x300/imm32/768
-      7d/jump-if->= $pixel:end/disp8
-      # eax = y*1024 + x
-      8b/-> *(ebp+0x10) 0/r32/eax
-      c1/shift 4/subop/left %eax 0xa/imm8
-      03/add-> *(ebp+0xc) 0/r32/eax
-      # eax += location of frame buffer
-      03/add-> *0x7f28 0/r32/eax
-      # *eax = color
-      8b/-> *(ebp+0x14) 1/r32/ecx
-      88/byte<- *eax 1/r32/CL
-      # return
-      eb $pixel:end/disp8
-    }
-    # TODO: fake screen
-$pixel:end:
+    # bounds checks
+    8b/-> *(ebp+8) 0/r32/eax
+    3d/compare-eax-and 0/imm32
+    7c/jump-if-< $pixel-on-real-screen:end/disp8
+    3d/compare-eax-and 0x400/imm32/1024
+    7d/jump-if->= $pixel-on-real-screen:end/disp8
+    8b/-> *(ebp+0xc) 0/r32/eax
+    3d/compare-eax-and 0/imm32
+    7c/jump-if-< $pixel-on-real-screen:end/disp8
+    3d/compare-eax-and 0x300/imm32/768
+    7d/jump-if->= $pixel-on-real-screen:end/disp8
+    # eax = y*1024 + x
+    8b/-> *(ebp+0xc) 0/r32/eax
+    c1/shift 4/subop/left %eax 0xa/imm8
+    03/add-> *(ebp+8) 0/r32/eax
+    # eax += location of frame buffer
+    03/add-> *0x7f28 0/r32/eax  # unsafe
+    # *eax = color
+    8b/-> *(ebp+0x10) 1/r32/ecx
+    88/byte<- *eax 1/r32/CL
+$pixel-on-real-screen:end:
     # . restore registers
     59/pop-to-ecx
     58/pop-to-eax
diff --git a/baremetal/102keyboard.subx b/baremetal/102keyboard.subx
index b047a7c2..f2c22339 100644
--- a/baremetal/102keyboard.subx
+++ b/baremetal/102keyboard.subx
@@ -1,5 +1,8 @@
 # check keyboard for a key
 # return 0 on no keypress or unrecognized key
+#
+# We need to do this in machine code because Mu doesn't have global variables
+# yet (for the keyboard buffer).
 
 == code
 
diff --git a/baremetal/103grapheme.subx b/baremetal/103grapheme.subx
index 9b19884f..4ee423d7 100644
--- a/baremetal/103grapheme.subx
+++ b/baremetal/103grapheme.subx
@@ -1,8 +1,11 @@
-# Use the built-in font to draw a grapheme to screen.
+# Use the built-in font to draw a grapheme to real screen.
+#
+# We need to do this in machine code because Mu doesn't have global variables
+# yet (for the start of video memory).
 
 == code
 
-draw-grapheme:  # screen: (addr screen), g: grapheme, x: int, y: int, color: int
+draw-grapheme-on-real-screen:  # g: grapheme, x: int, y: int, color: int
     # . prologue
     55/push-ebp
     89/<- %ebp 4/r32/esp
@@ -12,28 +15,27 @@ draw-grapheme:  # screen: (addr screen), g: grapheme, x: int, y: int, color: int
     52/push-edx
     53/push-ebx
     56/push-esi
-    # TODO: support fake screen; we currently assume 'screen' is always 0 (real)
     # var letter-bitmap/esi = font[g]
-    8b/-> *(ebp+0xc) 6/r32/esi
+    8b/-> *(ebp+8) 6/r32/esi
     c1 4/subop/shift-left %esi 4/imm8
     8d/copy-address *(esi+0x8800) 6/r32/esi  # font-start
     # if (letter-bitmap >= 0x9000) return  # characters beyond ASCII currently not supported
     81 7/subop/compare %esi 0x9000/imm32
     7d/jump-if->= $draw-grapheme:end/disp8
     # edx = y
-    8b/-> *(ebp+0x14) 2/r32/edx
+    8b/-> *(ebp+0x10) 2/r32/edx
     # var ymax/ebx: int = y + 16
-    8b/-> *(ebp+0x14) 3/r32/ebx
+    8b/-> *(ebp+0x10) 3/r32/ebx
     81 0/subop/add %ebx 0x10/imm32
     {
       # if (y >= ymax) break
       39/compare %edx 3/r32/ebx
       7d/jump-if->= break/disp8
       # eax = x + 7
-      8b/-> *(ebp+0x10) 0/r32/eax
+      8b/-> *(ebp+0xc) 0/r32/eax
       81 0/subop/add %eax 7/imm32
       # var xmin/ecx: int = x
-      8b/-> *(ebp+0x10) 1/r32/ecx
+      8b/-> *(ebp+0xc) 1/r32/ecx
       # var row-bitmap/ebx: int = *letter-bitmap
       53/push-ebx
       8b/-> *esi 3/r32/ebx
@@ -46,7 +48,7 @@ draw-grapheme:  # screen: (addr screen), g: grapheme, x: int, y: int, color: int
         # if LSB, draw a pixel
         {
           73/jump-if-not-CF break/disp8
-          (pixel *(ebp+8) %eax %edx *(ebp+0x18))
+          (pixel-on-real-screen %eax %edx *(ebp+0x14))
         }
         # --x
         48/decrement-eax
@@ -74,7 +76,7 @@ $draw-grapheme:end:
     5d/pop-to-ebp
     c3/return
 
-cursor-position:  # screen: (addr screen) -> _/eax: int, _/ecx: int
+cursor-position-on-real-screen:  # -> _/eax: int, _/ecx: int
     # . prologue
     55/push-ebp
     89/<- %ebp 4/r32/esp
@@ -87,16 +89,16 @@ $cursor-position:end:
     5d/pop-to-ebp
     c3/return
 
-set-cursor-position:  # screen: (addr screen), x: int, y: int
+set-cursor-position-on-real-screen:  # x: int, y: int
     # . prologue
     55/push-ebp
     89/<- %ebp 4/r32/esp
     # . save registers
     50/push-eax
     # TODO: support fake screen; we currently assume 'screen' is always 0 (real)
-    8b/-> *(ebp+0xc) 0/r32/eax
+    8b/-> *(ebp+8) 0/r32/eax
     89/<- *Default-next-x 0/r32/eax
-    8b/-> *(ebp+0x10) 0/r32/eax
+    8b/-> *(ebp+0xc) 0/r32/eax
     89/<- *Default-next-y 0/r32/eax
 $set-cursor-position:end:
     # . restore registers
diff --git a/baremetal/400.mu b/baremetal/400.mu
index ff84a643..5025a51c 100644
--- a/baremetal/400.mu
+++ b/baremetal/400.mu
@@ -1,8 +1,8 @@
 # screen
-sig pixel screen: (addr screen), x: int, y: int, color: int
-sig draw-grapheme screen: (addr screen), g: grapheme, x: int, y: int, color: int
-sig cursor-position screen: (addr screen) -> _/eax: int, _/ecx: int
-sig set-cursor-position screen: (addr screen), x: int, y: int
+sig pixel-on-real-screen x: int, y: int, color: int
+sig draw-grapheme-on-real-screen g: grapheme, x: int, y: int, color: int
+sig cursor-position-on-real-screen -> _/eax: int, _/ecx: int
+sig set-cursor-position-on-real-screen x: int, y: int
 
 # keyboard
 sig read-key kbd: (addr keyboard) -> _/eax: byte
diff --git a/baremetal/500clear-screen.mu b/baremetal/500clear-screen.mu
deleted file mode 100644
index 0dbcdee2..00000000
--- a/baremetal/500clear-screen.mu
+++ /dev/null
@@ -1,17 +0,0 @@
-fn clear-screen screen: (addr screen) {
-  var y/eax: int <- copy 0
-  {
-    compare y, 0x300  # 768
-    break-if->=
-    var x/edx: int <- copy 0
-    {
-      compare x, 0x400  # 1024
-      break-if->=
-      pixel 0, x, y, 0  # black
-      x <- increment
-      loop
-    }
-    y <- increment
-    loop
-  }
-}
diff --git a/baremetal/500text-screen.mu b/baremetal/500text-screen.mu
new file mode 100644
index 00000000..525ddb03
--- /dev/null
+++ b/baremetal/500text-screen.mu
@@ -0,0 +1,64 @@
+# Screen primitives for character-oriented output.
+#
+# Unlike the top-level, this text mode has no scrolling.
+
+fn draw-grapheme screen: (addr screen), g: grapheme, x: int, y: int, color: int {
+  {
+    compare screen, 0
+    break-if-!=
+    draw-grapheme-on-real-screen g, x, y, color
+    return
+  }
+  # TODO: fake screen
+}
+
+fn cursor-position screen: (addr screen) -> _/eax: int, _/ecx: int {
+  {
+    compare screen, 0
+    break-if-!=
+    var x/eax: int <- copy 0
+    var y/ecx: int <- copy 0
+    x, y <- cursor-position-on-real-screen
+    return x, y
+  }
+  # TODO: fake screen
+  return 0, 0
+}
+
+fn set-cursor-position screen: (addr screen), x: int, y: int {
+  {
+    compare screen, 0
+    break-if-!=
+    set-cursor-position-on-real-screen x, y
+    return
+  }
+  # TODO: fake screen
+}
+
+fn clear-screen screen: (addr screen) {
+  {
+    compare screen, 0
+    break-if-!=
+    clear-real-screen
+    return
+  }
+  # TODO: fake screen
+}
+
+fn clear-real-screen {
+  var y/eax: int <- copy 0
+  {
+    compare y, 0x300  # 768
+    break-if->=
+    var x/edx: int <- copy 0
+    {
+      compare x, 0x400  # 1024
+      break-if->=
+      pixel-on-real-screen x, y, 0  # black
+      x <- increment
+      loop
+    }
+    y <- increment
+    loop
+  }
+}
diff --git a/baremetal/503manhattan-line.mu b/baremetal/503manhattan-line.mu
index 0351fcb6..5c51473d 100644
--- a/baremetal/503manhattan-line.mu
+++ b/baremetal/503manhattan-line.mu
@@ -1,27 +1,27 @@
-fn draw-box screen: (addr screen), x1: int, y1: int, x2: int, y2: int, color: int {
-  draw-horizontal-line screen, x1, x2, y1, color
-  draw-vertical-line screen, x1, y1, y2, color
-  draw-horizontal-line screen, x1, x2, y2, color
-  draw-vertical-line screen, x2, y1, y2, color
+fn draw-box-on-real-screen x1: int, y1: int, x2: int, y2: int, color: int {
+  draw-horizontal-line-on-real-screen x1, x2, y1, color
+  draw-vertical-line-on-real-screen x1, y1, y2, color
+  draw-horizontal-line-on-real-screen x1, x2, y2, color
+  draw-vertical-line-on-real-screen x2, y1, y2, color
 }
 
-fn draw-horizontal-line screen: (addr screen), x1: int, x2: int, y: int, color: int {
+fn draw-horizontal-line-on-real-screen x1: int, x2: int, y: int, color: int {
   var x/eax: int <- copy x1
   {
     compare x, x2
     break-if->=
-    pixel screen, x, y, color
+    pixel-on-real-screen x, y, color
     x <- increment
     loop
   }
 }
 
-fn draw-vertical-line screen: (addr screen), x: int, y1: int, y2: int, color: int {
+fn draw-vertical-line-on-real-screen x: int, y1: int, y2: int, color: int {
   var y/eax: int <- copy y1
   {
     compare y, y2
     break-if->=
-    pixel screen, x, y, color
+    pixel-on-real-screen x, y, color
     y <- increment
     loop
   }
diff --git a/baremetal/ex2.mu b/baremetal/ex2.mu
index b386fe5b..d7a5e0c4 100644
--- a/baremetal/ex2.mu
+++ b/baremetal/ex2.mu
@@ -21,7 +21,7 @@ fn main {
       break-if->=
       var color/ecx: int <- copy x
       color <- and 0xff
-      pixel 0, x, y, color
+      pixel-on-real-screen x, y, color
       x <- increment
       loop
     }
diff --git a/baremetal/ex3.mu b/baremetal/ex3.mu
index 21e30466..206e22b3 100644
--- a/baremetal/ex3.mu
+++ b/baremetal/ex3.mu
@@ -18,7 +18,7 @@ fn main {
     var key/eax: byte <- read-key 0  # real keyboard
     compare key, 0
     loop-if-=  # busy wait
-    pixel 0, x, y, 0x31  # green
+    pixel-on-real-screen x, y, 0x31  # green
     x <- increment
     compare x, 0x400
     {
diff --git a/baremetal/ex6.mu b/baremetal/ex6.mu
index 5e47a57c..72d21f2e 100644
--- a/baremetal/ex6.mu
+++ b/baremetal/ex6.mu
@@ -11,7 +11,7 @@
 
 fn main {
   # drawing text within a bounding box
-  draw-box 0, 0xf, 0x1f, 0x79, 0x51, 0x4
+  draw-box-on-real-screen 0xf, 0x1f, 0x79, 0x51, 0x4
   var x/eax: int <- copy 0x20
   var y/ecx: int <- copy 0x20
   x, y <- draw-text-wrapping-right-then-down 0, "hello ",     0x10, 0x20, 0x78, 0x50, x, y, 0xa  # (0x10, 0x20) -> (0x78, 0x50)
diff --git a/baremetal/mu-init.subx b/baremetal/mu-init.subx
index 77e62ede..a1aa4e99 100644
--- a/baremetal/mu-init.subx
+++ b/baremetal/mu-init.subx
@@ -17,7 +17,7 @@ bd/copy-to-ebp 0/imm32
 {
   3d/compare-eax-and 0/imm32
   75/jump-if-!= break/disp8
-  (clear-screen)
+  (clear-real-screen)
   (main)
 }
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2025-01-09 13:08:31 +0000