7842 - new directory organization

Baremetal is now the default build target and therefore has its sources
at the top-level. Baremetal programs build using the phase-2 Mu toolchain
that requires a Linux kernel. This phase-2 codebase which used to be at
the top-level is now under the linux/ directory. Finally, the phase-2 toolchain,
while self-hosting, has a way to bootstrap from a C implementation, which
is now stored in linux/bootstrap. The bootstrap C implementation uses some
literate programming tools that are now in linux/bootstrap/tools.

So the whole thing has gotten inverted. Each directory should build one
artifact and include the main sources (along with standard library). Tools
used for building it are relegated to sub-directories, even though those
tools are often useful in their own right, and have had lots of interesting
programs written using them.

A couple of things have gotten dropped in this process:
  - I had old ways to run on just a Linux kernel, or with a Soso kernel.
    No more.
  - I had some old tooling for running a single test at the cursor. I haven't
    used that lately. Maybe I'll bring it back one day.

The reorg isn't done yet. Still to do:
  - redo documentation everywhere. All the README files, all other markdown,
    particularly vocabulary.md.
  - clean up how-to-run comments at the start of programs everywhere
  - rethink what to do with the html/ directory. Do we even want to keep
    supporting it?

In spite of these shortcomings, all the scripts at the top-level, linux/
and linux/bootstrap are working. The names of the scripts also feel reasonable.
This is a good milestone to take stock at.

1 files changed, 0 insertions, 86 deletions

diff --git a/tools/iso/kernel.soso/screen.c b/tools/iso/kernel.soso/screen.c
deleted file mode 100644
index b54bba83..00000000
--- a/tools/iso/kernel.soso/screen.c
+++ /dev/null
@@ -1,86 +0,0 @@
-#include "screen.h"
-#include "common.h"
-#include "serial.h"
-
-#define SCREEN_LINE_COUNT 25
-#define SCREEN_COLUMN_COUNT 80
-
-static unsigned char *videoStart = (unsigned char*)0xB8000;
-
-static uint16 gCurrentLine = 0;
-static uint16 gCurrentColumn = 0;
-static uint8 gColor = 0x0A;
-
-void Screen_FlushFromTty(Tty* tty) {
-    memcpy(videoStart, tty->buffer, SCREEN_LINE_COUNT * SCREEN_COLUMN_COUNT * 2);
-
-    Screen_MoveCursor(tty->currentLine, tty->currentColumn);
-}
-
-void Screen_Print(int row, int column, const char* text) {
-    unsigned char * video = videoStart;
-    
-    video += (row * SCREEN_COLUMN_COUNT + column) * 2;
-    while(*text != 0) {
-        *video++ = *text++;
-        *video++ = gColor;
-    }
-}
-
-void Screen_SetActiveColor(uint8 color) {
-    gColor = color;
-}
-
-void Screen_ApplyColor(uint8 color) {
-    gColor = color;
-
-    unsigned char * video = videoStart;
-    int i = 0;
-
-    for (i = 0; i < SCREEN_LINE_COUNT * SCREEN_COLUMN_COUNT; ++i) {
-        video++;
-        *video++ = gColor;
-    }
-}
-
-void Screen_Clear() {
-	unsigned char * video = videoStart;
-	int i = 0;
-    
-    for (i = 0; i < SCREEN_LINE_COUNT * SCREEN_COLUMN_COUNT; ++i) {
-        *video++ = 0;
-        *video++ = gColor;
-    }
-    
-    gCurrentLine = 0;
-    gCurrentColumn = 0;
-}
-
-void Screen_MoveCursor(uint16 line, uint16 column) {
-   // The screen is 80 characters wide...
-   uint16 cursorLocation = line * SCREEN_COLUMN_COUNT + column;
-   outb(0x3D4, 14);                  // Tell the VGA board we are setting the high cursor byte.
-   outb(0x3D5, cursorLocation >> 8); // Send the high cursor byte.
-   outb(0x3D4, 15);                  // Tell the VGA board we are setting the low cursor byte.
-   outb(0x3D5, cursorLocation);      // Send the low cursor byte.
-
-   gCurrentColumn = column;
-   gCurrentLine = line;
-}
-
-void Screen_SetCursorVisible(BOOL visible) {
-    uint8 cursor = inb(0x3d5);
-
-    if (visible) {
-        cursor &= ~0x20;//5th bit cleared when cursor visible
-    }
-    else {
-        cursor |= 0x20;//5th bit set when cursor invisible
-    }
-    outb(0x3D5, cursor);
-}
-
-void Screen_GetCursor(uint16* line, uint16* column) {
-    *line = gCurrentLine;
-    *column = gCurrentColumn;
-}