arch: remove tile port

The Tile architecture port was added by Chris Metcalf in 2010, and
maintained until early 2018 when he orphaned it due to his departure
from Mellanox, and nobody else stepped up to maintain it. The product
line is still around in the form of the BlueField SoC, but no longer
uses the Tile architecture.

There are also still products for sale with Tile-GX SoCs, notably the
Mikrotik CCR router family. The products all use old (linux-3.3) kernels
with lots of patches and won't be upgraded by their manufacturers. There
have been efforts to port both OpenWRT and Debian to these, but both
projects have stalled and are very unlikely to be continued in the future.

Given that we are reasonably sure that nobody is still using the port
with an upstream kernel any more, it seems better to remove it now while
the port is in a good shape than to let it bitrot for a few years first.

Cc: Chris Metcalf <chris.d.metcalf@gmail.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: http://www.mellanox.com/page/npu_multicore_overview
Link: https://jenkins.debian.net/view/rebootstrap/job/rebootstrap_tilegx_gcc7/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 165 deletions

diff --git a/arch/tile/mm/elf.c b/arch/tile/mm/elf.c
deleted file mode 100644
index 889901824400..000000000000
--- a/arch/tile/mm/elf.c
+++ /dev/null
@@ -1,165 +0,0 @@
-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- *   This program is free software; you can redistribute it and/or
- *   modify it under the terms of the GNU General Public License
- *   as published by the Free Software Foundation, version 2.
- *
- *   This program is distributed in the hope that it will be useful, but
- *   WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- */
-
-#include <linux/mm.h>
-#include <linux/pagemap.h>
-#include <linux/binfmts.h>
-#include <linux/compat.h>
-#include <linux/mman.h>
-#include <linux/file.h>
-#include <linux/elf.h>
-#include <asm/pgtable.h>
-#include <asm/pgalloc.h>
-#include <asm/sections.h>
-#include <asm/vdso.h>
-#include <arch/sim.h>
-
-/* Notify a running simulator, if any, that an exec just occurred. */
-static void sim_notify_exec(const char *binary_name)
-{
-	unsigned char c;
-	do {
-		c = *binary_name++;
-		__insn_mtspr(SPR_SIM_CONTROL,
-			     (SIM_CONTROL_OS_EXEC
-			      | (c << _SIM_CONTROL_OPERATOR_BITS)));
-
-	} while (c);
-}
-
-static int notify_exec(struct mm_struct *mm)
-{
-	int ret = 0;
-	char *buf, *path;
-	struct vm_area_struct *vma;
-	struct file *exe_file;
-
-	if (!sim_is_simulator())
-		return 1;
-
-	buf = (char *) __get_free_page(GFP_KERNEL);
-	if (buf == NULL)
-		return 0;
-
-	exe_file = get_mm_exe_file(mm);
-	if (exe_file == NULL)
-		goto done_free;
-
-	path = file_path(exe_file, buf, PAGE_SIZE);
-	if (IS_ERR(path))
-		goto done_put;
-
-	down_read(&mm->mmap_sem);
-	for (vma = current->mm->mmap; ; vma = vma->vm_next) {
-		if (vma == NULL) {
-			up_read(&mm->mmap_sem);
-			goto done_put;
-		}
-		if (vma->vm_file == exe_file)
-			break;
-	}
-
-	/*
-	 * Notify simulator of an ET_DYN object so we know the load address.
-	 * The somewhat cryptic overuse of SIM_CONTROL_DLOPEN allows us
-	 * to be backward-compatible with older simulator releases.
-	 */
-	if (vma->vm_start == (ELF_ET_DYN_BASE & PAGE_MASK)) {
-		char buf[64];
-		int i;
-
-		snprintf(buf, sizeof(buf), "0x%lx:@", vma->vm_start);
-		for (i = 0; ; ++i) {
-			char c = buf[i];
-			__insn_mtspr(SPR_SIM_CONTROL,
-				     (SIM_CONTROL_DLOPEN
-				      | (c << _SIM_CONTROL_OPERATOR_BITS)));
-			if (c == '\0') {
-				ret = 1; /* success */
-				break;
-			}
-		}
-	}
-	up_read(&mm->mmap_sem);
-
-	sim_notify_exec(path);
-done_put:
-	fput(exe_file);
-done_free:
-	free_page((unsigned long)buf);
-	return ret;
-}
-
-/* Notify a running simulator, if any, that we loaded an interpreter. */
-static void sim_notify_interp(unsigned long load_addr)
-{
-	size_t i;
-	for (i = 0; i < sizeof(load_addr); i++) {
-		unsigned char c = load_addr >> (i * 8);
-		__insn_mtspr(SPR_SIM_CONTROL,
-			     (SIM_CONTROL_OS_INTERP
-			      | (c << _SIM_CONTROL_OPERATOR_BITS)));
-	}
-}
-
-
-int arch_setup_additional_pages(struct linux_binprm *bprm,
-				int executable_stack)
-{
-	struct mm_struct *mm = current->mm;
-	int retval = 0;
-
-	/*
-	 * Notify the simulator that an exec just occurred.
-	 * If we can't find the filename of the mapping, just use
-	 * whatever was passed as the linux_binprm filename.
-	 */
-	if (!notify_exec(mm))
-		sim_notify_exec(bprm->filename);
-
-	down_write(&mm->mmap_sem);
-
-	retval = setup_vdso_pages();
-
-#ifndef __tilegx__
-	/*
-	 * Set up a user-interrupt mapping here; the user can't
-	 * create one themselves since it is above TASK_SIZE.
-	 * We make it unwritable by default, so the model for adding
-	 * interrupt vectors always involves an mprotect.
-	 */
-	if (!retval) {
-		unsigned long addr = MEM_USER_INTRPT;
-		addr = mmap_region(NULL, addr, INTRPT_SIZE,
-				   VM_READ|VM_EXEC|
-				   VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, 0, NULL);
-		if (addr > (unsigned long) -PAGE_SIZE)
-			retval = (int) addr;
-	}
-#endif
-
-	up_write(&mm->mmap_sem);
-
-	return retval;
-}
-
-
-void elf_plat_init(struct pt_regs *regs, unsigned long load_addr)
-{
-	/* Zero all registers. */
-	memset(regs, 0, sizeof(*regs));
-
-	/* Report the interpreter's load address. */
-	sim_notify_interp(load_addr);
-}