runtime: remove tiny

It is unmaintained and untested, and I think it's broken too.
It was a toy to show that Go can run on real hardware,
and it served its purpose.

The source code will of course remain in the repository
history, so it could be brought back if needed later.

R=r, r2, uriel
CC=golang-dev
https://golang.org/cl/3996047

src/pkg/runtime/Makefile

@@ -34,9 +34,6 @@ GOFILES=\
 	runtime_defs.go\
 	$(GOOS)/runtime_defs.go\
 
-GOFILES_tiny=\
-	tiny/io.go\
-
 OFILES_windows=\
 	syscall.$O\
 

src/pkg/runtime/tiny/386/defs.h

-// nothing to see here

src/pkg/runtime/tiny/386/rt0.s

-// Copyright 2010 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-TEXT _rt0_386_tiny(SB), 7, $0
-	// Disable interrupts.
-	CLI
-	
-	// Establish stack.
-	MOVL	$0x10000, AX
-	MOVL	AX, SP
-	
-	// Set up memory hardware.
-	CALL	runtime·msetup(SB)
-
-	// _rt0_386 expects to find argc, argv, envv on stack.
-	// Set up argv=["kernel"] and envv=[].
-	SUBL	$64, SP
-	MOVL	$1, 0(SP)
-	MOVL	$runtime·kernel(SB), 4(SP)
-	MOVL	$0, 8(SP)
-	MOVL	$0, 12(SP)
-	JMP	_rt0_386(SB)
-
-DATA runtime·kernel(SB)/7, $"kernel\z"
-GLOBL runtime·kernel(SB), $7
-	
-

src/pkg/runtime/tiny/386/signal.c

-// Copyright 2010 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file. 
-
-#include "runtime.h"
-
-extern void runtime·write(int32 fd, void *v, int32 len, int32 cap);	// slice, spelled out
-
-int32
-runtime·write(int32 fd, void *v, int32 len)
-{
-	runtime·write(fd, v, len, len);
-	return len;
-}
-
-void
-runtime·gettime(int64*, int32*) 
-{
-}

src/pkg/runtime/tiny/386/sys.s

-// Copyright 2010 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Manipulation of segment tables.
-//
-// Descriptor entry format for system call
-// is the native machine format, ugly as it is:
-//
-//	2-byte limit
-//	3-byte base
-//	1-byte: 0x80=present, 0x60=dpl<<5, 0x1F=type
-//	1-byte: 0x80=limit is *4k, 0x40=32-bit operand size,
-//		0x0F=4 more bits of limit
-//	1 byte: 8 more bits of base
-
-// Called to set up memory hardware.
-// Already running in 32-bit mode thanks to boot block,
-// but we need to install our new GDT that we can modify.
-TEXT runtime·msetup(SB), 7, $0
-	MOVL	runtime·gdtptr(SB), GDTR
-	MOVL	$(1*8+0), AX
-	MOVW	AX, DS
-	MOVW	AX, ES
-	MOVW	AX, SS
-	MOVW	$0, AX
-	MOVW	AX, FS
-	MOVW	AX, GS
-
-	// long jmp to cs:mret
-	BYTE	$0xEA
-	LONG $runtime·mret(SB)
-	WORD $(2*8+0)
-	
-TEXT runtime·mret(SB), 7, $0
-	RET
-
-// GDT memory
-TEXT runtime·gdt(SB), 7, $0
-	// null segment
-	LONG	$0
-	LONG	$0
-	
-	// 4GB data segment
-	LONG	$0xFFFF
-	LONG	$0x00CF9200
-
-	// 4GB code segment
-	LONG	$0xFFFF
-	LONG	$0x00CF9A00
-
-	// null segment (will be thread-local storage segment)
-	LONG	$0
-	LONG	$0
-
-// GDT pseudo-descriptor
-TEXT runtime·gdtptr(SB), 7, $0
-	WORD	$(4*8)
-	LONG	$runtime·gdt(SB)
-
-// Called to establish the per-thread segment.
-// Write to gdt[3] and reload the gdt register.
-// setldt(int entry, int address, int limit)
-TEXT runtime·setldt(SB),7,$32
-	MOVL	address+4(FP), BX	// aka base
-	MOVL	limit+8(FP), CX
-
-	// set up segment descriptor
-	LEAL	gdt+(3*8)(SB), AX	// gdt entry #3
-	MOVL	$0, 0(AX)
-	MOVL	$0, 4(AX)
-
-	MOVW	BX, 2(AX)
-	SHRL	$16, BX
-	MOVB	BX, 4(AX)
-	SHRL	$8, BX
-	MOVB	BX, 7(AX)
-
-	MOVW	CX, 0(AX)
-	SHRL	$16, CX
-	ANDL	$0x0F, CX
-	ORL	$0x40, CX		// 32-bit operand size
-	MOVB	CX, 6(AX)
-	MOVB	$0xF2, 5(AX)	// r/w data descriptor, dpl=3, present
-
-	MOVL	runtime·gdtptr(SB), GDTR
-
-	// Compute segment selector - (entry*8+0)
-	MOVL	$(3*8+0), AX
-	MOVW	AX, GS
-	RET
-

src/pkg/runtime/tiny/README

-This directory contains a simple example of how one might
-start Go running on bare hardware. There is currently code
-for 386 and arm.
-
-
-386
-
-It is very primitive but can run go/test/sieve.go, the concurrent
-prime sieve, on a uniprocessor.
-
-To run, first build the tools by running all.bash with GOARCH=386
-and GOOS set to your normal GOOS (linux, darwin).  Then:
-
-	export GOOS=tiny
-	cd $GOROOT/src/pkg/runtime
-	make clean
-	make install
-	cd tiny
-	8g $GOROOT/test/sieve.go
-	8l sieve.8
-	8l -a sieve.8 >sieve.asm	# can consult sieve.asm for debugging
-	dd if=/dev/zero of=disk count=10000
-	cat bootblock 8.out | dd of=disk conv=notrunc
-
-Use the built-in print(text string) function to print to the
-console.
-
-
-BOCHS
-
-You may have to tweak the .bochsrc depending on your system,
-and you may need to install the Bochs emulator.
-
-    $ cp dot-bochsrc .bochsrc
-    $ $EDITOR .bochsrc # tweak it if required
-    $ bochs
-
-
-ORACLE xVM VIRTUALBOX
-
-Install VirtualBox. Then:
-
-    Build 'disk' (described above under '386').
-
-    $ VBoxManage convertfromraw disk go-tiny.vdi
-    $ VirtualBox
-        create a new VM; as disk use the go-tiny.vdi image.
-        start the vm.
-
-
-QEMU / KVM
-
-This should work the same for qemu and kvm (really: qemu-kvm).
-
-    Build 'disk' (described above under '386').
-
-    $ qemu -hda disk
-
-
-ARM
-
-First build the toolchain using GOARCH=arm and GOOS=linux. When
-you build your embedded code set GOARCH=tiny.
-
-	export GOOS=tiny
-	cd $GOROOT/src/pkg/runtime
-	make clean
-	make install
-
-On arm the tiny runtime doesn't define a low level write function. You can either
-define a stub if you don't need debug output, or more usefully, define it to
-print to some debug serial port. Here is a sample function that prints to
-the DBGU on an at91sam7s:
-
-#define DBGU_CSR  ((uint32*)   0xFFFFF214) // (DBGU) Channel Status Register
-#define US_TXRDY        ((uint32) 0x1 <<  1) // (DBGU) TXRDY Interrupt
-#define DBGU_THR  ((uint32*)   0xFFFFF21C) // (DBGU) Transmitter Holding Register
-
-int32
-write(int32 fd, void* b, int32 n)
-{
-	uint32 i;
-	uint8* s = (uint8*)b;
-
-	for (i = 0; i < n; i++) {
-		while ((*DBGU_CSR & US_TXRDY) == 0) {
-		}
-		*DBGU_THR = *s;
-		s++;
-	}
-	return n;
-}
-
-
-
-The 386 bootblock is from MIT's xv6 project and carries this notice:
-
-    The xv6 software is:
-    
-    Copyright (c) 2006-2009 Frans Kaashoek, Robert Morris, Russ Cox,
-                            Massachusetts Institute of Technology
-    
-    Permission is hereby granted, free of charge, to any person obtaining
-    a copy of this software and associated documentation files (the
-    "Software"), to deal in the Software without restriction, including
-    without limitation the rights to use, copy, modify, merge, publish,
-    distribute, sublicense, and/or sell copies of the Software, and to
-    permit persons to whom the Software is furnished to do so, subject to
-    the following conditions:
-    
-    The above copyright notice and this permission notice shall be
-    included in all copies or substantial portions of the Software.
-    
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-    LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-    OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-http://pdos.csail.mit.edu/6.828/xv6/
-

src/pkg/runtime/tiny/arm/defs.h

-// nothing to see here

src/pkg/runtime/tiny/arm/rt0.s

-// nothing to see here

src/pkg/runtime/tiny/arm/signal.c

-// nothing to see here

src/pkg/runtime/tiny/arm/sys.s

-// nothing to see here

src/pkg/runtime/tiny/dot-bochsrc

-romimage: file=$BXSHARE/BIOS-bochs-latest
-cpu: count=1, ips=100000000, reset_on_triple_fault=0
-megs: 32
-vgaromimage: file=/usr/share/vgabios/vgabios.bin
-vga: extension=none
-ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
-ata1: enabled=1, ioaddr1=0x170, ioaddr2=0x370, irq=15
-ata2: enabled=0, ioaddr1=0x1e8, ioaddr2=0x3e0, irq=11
-ata3: enabled=0, ioaddr1=0x168, ioaddr2=0x360, irq=9
-ata0-master: type=disk, mode=flat, path="disk", cylinders=100, heads=10, spt=10
-boot: disk
-panic: action=ask
-error: action=report
-info: action=report
-debug: action=ignore
-debugger_log: -
-config_interface: wx
-display_library: wx

src/pkg/runtime/tiny/io.go

-// Copyright 2010 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Simple CGA screen output
-
-package runtime
-
-import "unsafe"
-
-var crt *[25 * 80]uint16
-var pos int
-
-func putc(c int) {
-	const (
-		port  = 0x3d4
-		color = 0x0700 // white on black
-	)
-
-	if crt == nil {
-		// init on demand in case printf is called before
-		// initialization runs.
-		var mem uintptr = 0xb8000
-		crt = (*[25 * 80]uint16)(unsafe.Pointer(mem))
-		pos = 0
-		for i := range crt[0:] {
-			crt[i] = 0
-		}
-	}
-
-	switch c {
-	case '\n':
-		pos += 80 - pos%80
-	default:
-		crt[pos] = uint16(c&0xff | color)
-		pos++
-	}
-
-	if pos/80 >= 24 {
-		copy(crt[0:], crt[80:])
-		pos -= 80
-		for i := 0; i < 80; i++ {
-			crt[24*80+i] = 0
-		}
-	}
-	crt[pos] = ' ' | color
-}
-
-func write(fd int32, b []byte) {
-	for _, c := range b {
-		putc(int(c))
-	}
-}

src/pkg/runtime/tiny/mem.c

-// Copyright 2010 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-#include "runtime.h"
-#include "malloc.h"
-
-// Assume there's an arbitrary amount of memory starting at "end".
-// Sizing PC memory is beyond the scope of this demo.
-
-static byte *allocp;
-
-void*
-runtime·SysAlloc(uintptr ask)
-{
-	extern byte end[];
-	byte *q;
-	
-	if(allocp == nil) {
-		allocp = end;
-		allocp += 7 & -(uintptr)allocp;
-	}
-	ask += 7 & -ask;
-
-	q = allocp;
-	allocp += ask;
-	runtime·memclr(q, ask);
-	return q;
-}
-
-void
-runtime·SysFree(void *v, uintptr n)
-{
-	// Push pointer back if this is a free
-	// of the most recent SysAlloc.
-	n += 7 & -n;
-	if(allocp == (byte*)v+n)
-		allocp -= n;
-}
-
-void
-runtime·SysUnused(void *v, uintptr n)
-{
-	USED(v, n);
-}
-
-void
-runtime·SysMemInit(void)
-{
-}

src/pkg/runtime/tiny/os.h

-// nothing to see here

src/pkg/runtime/tiny/runtime_defs.go

-// Copyright 2010 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// OS-Specific Go definitions of internal structures. Master is runtime.h
-
-package runtime
-
-type lock struct {
-	key  uint32
-	sema uint32
-}
-
-type note lock

src/pkg/runtime/tiny/signals.h

-// nothing to see here

src/pkg/runtime/tiny/thread.c

-// Copyright 2010 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-#include "runtime.h"
-
-int8 *goos = "tiny";
-
-void
-runtime·minit(void)
-{
-}
-
-void
-runtime·osinit(void)
-{
-}
-
-void
-runtime·goenvs(void)
-{
-	runtime·goenvs_unix();
-}
-
-void
-runtime·initsig(int32 queue)
-{
-}
-
-void
-runtime·exit(int32)
-{
-	for(;;);
-}
-
-// single processor, no interrupts,
-// so no need for real concurrency or atomicity
-
-void
-runtime·newosproc(M *m, G *g, void *stk, void (*fn)(void))
-{
-	USED(m, g, stk, fn);
-	runtime·throw("newosproc");
-}
-
-void
-runtime·lock(Lock *l)
-{
-	if(m->locks < 0)
-		runtime·throw("lock count");
-	m->locks++;
-	if(l->key != 0)
-		runtime·throw("deadlock");
-	l->key = 1;
-}
-
-void
-runtime·unlock(Lock *l)
-{
-	m->locks--;
-	if(m->locks < 0)
-		runtime·throw("lock count");
-	if(l->key != 1)
-		runtime·throw("unlock of unlocked lock");
-	l->key = 0;
-}
-
-void 
-runtime·destroylock(Lock *l)
-{
-	// nothing
-}
-
-void
-runtime·noteclear(Note *n)
-{
-	n->lock.key = 0;
-}
-
-void
-runtime·notewakeup(Note *n)
-{
-	n->lock.key = 1;
-}
-
-void
-runtime·notesleep(Note *n)
-{
-	if(n->lock.key != 1)
-		runtime·throw("notesleep");
-}
-