CRIS: Drop support for the CRIS port

The port was added back in 2000 so it's no longer even a good source
of inspiration for newer ports (if it ever was)

The last SoC (ARTPEC-3) with a CRIS main CPU was launched in 2008.

Coupled with time and working developer board hardware being
in low supply, it's time to drop the port from Linux.

So long and thanks for all the fish!

Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 117 deletions

diff --git a/arch/cris/mm/tlb.c b/arch/cris/mm/tlb.c
deleted file mode 100644
index e0dbea62cb81..000000000000
--- a/arch/cris/mm/tlb.c
+++ /dev/null
@@ -1,117 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- *  linux/arch/cris/mm/tlb.c
- *
- *  Copyright (C) 2000, 2001  Axis Communications AB
- *  
- *  Authors:   Bjorn Wesen (bjornw@axis.com)
- *
- */
-
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/mm_types.h>
-
-#include <asm/tlb.h>
-
-#define D(x)
-
-/* The TLB can host up to 64 different mm contexts at the same time.
- * The running context is R_MMU_CONTEXT, and each TLB entry contains a
- * page_id that has to match to give a hit. In page_id_map, we keep track
- * of which mm we have assigned to which page_id, so that we know when
- * to invalidate TLB entries.
- *
- * The last page_id is never running - it is used as an invalid page_id
- * so we can make TLB entries that will never match.
- *
- * Notice that we need to make the flushes atomic, otherwise an interrupt
- * handler that uses vmalloced memory might cause a TLB load in the middle
- * of a flush causing.
- */
-
-struct mm_struct *page_id_map[NUM_PAGEID];
-static int map_replace_ptr = 1;  /* which page_id_map entry to replace next */
-
-/* the following functions are similar to those used in the PPC port */
-
-static inline void
-alloc_context(struct mm_struct *mm)
-{
-	struct mm_struct *old_mm;
-
-	D(printk("tlb: alloc context %d (%p)\n", map_replace_ptr, mm));
-
-	/* did we replace an mm ? */
-
-	old_mm = page_id_map[map_replace_ptr];
-
-	if(old_mm) {
-		/* throw out any TLB entries belonging to the mm we replace
-		 * in the map
-		 */
-		flush_tlb_mm(old_mm);
-
-		old_mm->context.page_id = NO_CONTEXT;
-	}
-
-	/* insert it into the page_id_map */
-
-	mm->context.page_id = map_replace_ptr;
-	page_id_map[map_replace_ptr] = mm;
-
-	map_replace_ptr++;
-
-	if(map_replace_ptr == INVALID_PAGEID)
-		map_replace_ptr = 0;         /* wrap around */	
-}
-
-/* 
- * if needed, get a new MMU context for the mm. otherwise nothing is done.
- */
-
-void
-get_mmu_context(struct mm_struct *mm)
-{
-	if(mm->context.page_id == NO_CONTEXT)
-		alloc_context(mm);
-}
-
-/* called by __exit_mm to destroy the used MMU context if any before
- * destroying the mm itself. this is only called when the last user of the mm
- * drops it.
- *
- * the only thing we really need to do here is mark the used PID slot
- * as empty.
- */
-
-void
-destroy_context(struct mm_struct *mm)
-{
-	if(mm->context.page_id != NO_CONTEXT) {
-		D(printk("destroy_context %d (%p)\n", mm->context.page_id, mm));
-		flush_tlb_mm(mm);  /* TODO this might be redundant ? */
-		page_id_map[mm->context.page_id] = NULL;
-	}
-}
-
-/* called once during VM initialization, from init.c */
-
-void __init
-tlb_init(void)
-{
-	int i;
-
-	/* clear the page_id map */
-
-	for (i = 1; i < ARRAY_SIZE(page_id_map); i++)
-		page_id_map[i] = NULL;
-	
-	/* invalidate the entire TLB */
-
-	flush_tlb_all();
-
-	/* the init_mm has context 0 from the boot */
-
-	page_id_map[0] = &init_mm;
-}