arch: remove m32r port

The Mitsubishi/Renesas m32r architecture has been around for many years,
but the Linux port has been obsolete for a very long time as well, with
the last significant updates done for linux-2.6.14.

While some m32r microcontrollers are still being marketed by Renesas,
those are apparently no longer possible to support, mainly due to the
lack of an external memory interface.

Hirokazu Takata was the maintainer until the architecture got marked
Orphaned in 2014.

Link: http://www.linux-m32r.org/
Link: https://www.renesas.com/en-eu/products/microcontrollers-microprocessors/m32r.html
Cc: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 550 deletions

diff --git a/arch/m32r/mm/fault.c b/arch/m32r/mm/fault.c
deleted file mode 100644
index 46d9a5ca0e3a..000000000000
--- a/arch/m32r/mm/fault.c
+++ /dev/null
@@ -1,550 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- *  linux/arch/m32r/mm/fault.c
- *
- *  Copyright (c) 2001, 2002  Hitoshi Yamamoto, and H. Kondo
- *  Copyright (c) 2004  Naoto Sugai, NIIBE Yutaka
- *
- *  Some code taken from i386 version.
- *    Copyright (C) 1995  Linus Torvalds
- */
-
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/ptrace.h>
-#include <linux/mman.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/interrupt.h>
-#include <linux/init.h>
-#include <linux/tty.h>
-#include <linux/vt_kern.h>		/* For unblank_screen() */
-#include <linux/highmem.h>
-#include <linux/extable.h>
-#include <linux/uaccess.h>
-
-#include <asm/m32r.h>
-#include <asm/hardirq.h>
-#include <asm/mmu_context.h>
-#include <asm/tlbflush.h>
-
-extern void die(const char *, struct pt_regs *, long);
-
-#ifndef CONFIG_SMP
-asmlinkage unsigned int tlb_entry_i_dat;
-asmlinkage unsigned int tlb_entry_d_dat;
-#define tlb_entry_i tlb_entry_i_dat
-#define tlb_entry_d tlb_entry_d_dat
-#else
-unsigned int tlb_entry_i_dat[NR_CPUS];
-unsigned int tlb_entry_d_dat[NR_CPUS];
-#define tlb_entry_i tlb_entry_i_dat[smp_processor_id()]
-#define tlb_entry_d tlb_entry_d_dat[smp_processor_id()]
-#endif
-
-extern void init_tlb(void);
-
-/*======================================================================*
- * do_page_fault()
- *======================================================================*
- * This routine handles page faults.  It determines the address,
- * and the problem, and then passes it off to one of the appropriate
- * routines.
- *
- * ARGUMENT:
- *  regs       : M32R SP reg.
- *  error_code : See below
- *  address    : M32R MMU MDEVA reg. (Operand ACE)
- *             : M32R BPC reg. (Instruction ACE)
- *
- * error_code :
- *  bit 0 == 0 means no page found, 1 means protection fault
- *  bit 1 == 0 means read, 1 means write
- *  bit 2 == 0 means kernel, 1 means user-mode
- *  bit 3 == 0 means data, 1 means instruction
- *======================================================================*/
-#define ACE_PROTECTION		1
-#define ACE_WRITE		2
-#define ACE_USERMODE		4
-#define ACE_INSTRUCTION		8
-
-asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code,
-  unsigned long address)
-{
-	struct task_struct *tsk;
-	struct mm_struct *mm;
-	struct vm_area_struct * vma;
-	unsigned long page, addr;
-	unsigned long flags = 0;
-	int fault;
-	siginfo_t info;
-
-	/*
-	 * If BPSW IE bit enable --> set PSW IE bit
-	 */
-	if (regs->psw & M32R_PSW_BIE)
-		local_irq_enable();
-
-	tsk = current;
-
-	info.si_code = SEGV_MAPERR;
-
-	/*
-	 * We fault-in kernel-space virtual memory on-demand. The
-	 * 'reference' page table is init_mm.pgd.
-	 *
-	 * NOTE! We MUST NOT take any locks for this case. We may
-	 * be in an interrupt or a critical region, and should
-	 * only copy the information from the master page table,
-	 * nothing more.
-	 *
-	 * This verifies that the fault happens in kernel space
-	 * (error_code & ACE_USERMODE) == 0, and that the fault was not a
-	 * protection error (error_code & ACE_PROTECTION) == 0.
-	 */
-	if (address >= TASK_SIZE && !(error_code & ACE_USERMODE))
-		goto vmalloc_fault;
-
-	mm = tsk->mm;
-
-	/*
-	 * If we're in an interrupt or have no user context or have pagefaults
-	 * disabled then we must not take the fault.
-	 */
-	if (faulthandler_disabled() || !mm)
-		goto bad_area_nosemaphore;
-
-	if (error_code & ACE_USERMODE)
-		flags |= FAULT_FLAG_USER;
-
-	/* When running in the kernel we expect faults to occur only to
-	 * addresses in user space.  All other faults represent errors in the
-	 * kernel and should generate an OOPS.  Unfortunately, in the case of an
-	 * erroneous fault occurring in a code path which already holds mmap_sem
-	 * we will deadlock attempting to validate the fault against the
-	 * address space.  Luckily the kernel only validly references user
-	 * space from well defined areas of code, which are listed in the
-	 * exceptions table.
-	 *
-	 * As the vast majority of faults will be valid we will only perform
-	 * the source reference check when there is a possibility of a deadlock.
-	 * Attempt to lock the address space, if we cannot we then validate the
-	 * source.  If this is invalid we can skip the address space check,
-	 * thus avoiding the deadlock.
-	 */
-	if (!down_read_trylock(&mm->mmap_sem)) {
-		if ((error_code & ACE_USERMODE) == 0 &&
-		    !search_exception_tables(regs->psw))
-			goto bad_area_nosemaphore;
-		down_read(&mm->mmap_sem);
-	}
-
-	vma = find_vma(mm, address);
-	if (!vma)
-		goto bad_area;
-	if (vma->vm_start <= address)
-		goto good_area;
-	if (!(vma->vm_flags & VM_GROWSDOWN))
-		goto bad_area;
-
-	if (error_code & ACE_USERMODE) {
-		/*
-		 * accessing the stack below "spu" is always a bug.
-		 * The "+ 4" is there due to the push instruction
-		 * doing pre-decrement on the stack and that
-		 * doesn't show up until later..
-		 */
-		if (address + 4 < regs->spu)
-			goto bad_area;
-	}
-
-	if (expand_stack(vma, address))
-		goto bad_area;
-/*
- * Ok, we have a good vm_area for this memory access, so
- * we can handle it..
- */
-good_area:
-	info.si_code = SEGV_ACCERR;
-	switch (error_code & (ACE_WRITE|ACE_PROTECTION)) {
-		default:	/* 3: write, present */
-			/* fall through */
-		case ACE_WRITE:	/* write, not present */
-			if (!(vma->vm_flags & VM_WRITE))
-				goto bad_area;
-			flags |= FAULT_FLAG_WRITE;
-			break;
-		case ACE_PROTECTION:	/* read, present */
-		case 0:		/* read, not present */
-			if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
-				goto bad_area;
-	}
-
-	/*
-	 * For instruction access exception, check if the area is executable
-	 */
-	if ((error_code & ACE_INSTRUCTION) && !(vma->vm_flags & VM_EXEC))
-	  goto bad_area;
-
-	/*
-	 * If for any reason at all we couldn't handle the fault,
-	 * make sure we exit gracefully rather than endlessly redo
-	 * the fault.
-	 */
-	addr = (address & PAGE_MASK);
-	set_thread_fault_code(error_code);
-	fault = handle_mm_fault(vma, addr, flags);
-	if (unlikely(fault & VM_FAULT_ERROR)) {
-		if (fault & VM_FAULT_OOM)
-			goto out_of_memory;
-		else if (fault & VM_FAULT_SIGSEGV)
-			goto bad_area;
-		else if (fault & VM_FAULT_SIGBUS)
-			goto do_sigbus;
-		BUG();
-	}
-	if (fault & VM_FAULT_MAJOR)
-		tsk->maj_flt++;
-	else
-		tsk->min_flt++;
-	set_thread_fault_code(0);
-	up_read(&mm->mmap_sem);
-	return;
-
-/*
- * Something tried to access memory that isn't in our memory map..
- * Fix it, but check if it's kernel or user first..
- */
-bad_area:
-	up_read(&mm->mmap_sem);
-
-bad_area_nosemaphore:
-	/* User mode accesses just cause a SIGSEGV */
-	if (error_code & ACE_USERMODE) {
-		tsk->thread.address = address;
-		tsk->thread.error_code = error_code | (address >= TASK_SIZE);
-		tsk->thread.trap_no = 14;
-		info.si_signo = SIGSEGV;
-		info.si_errno = 0;
-		/* info.si_code has been set above */
-		info.si_addr = (void __user *)address;
-		force_sig_info(SIGSEGV, &info, tsk);
-		return;
-	}
-
-no_context:
-	/* Are we prepared to handle this kernel fault?  */
-	if (fixup_exception(regs))
-		return;
-
-/*
- * Oops. The kernel tried to access some bad page. We'll have to
- * terminate things with extreme prejudice.
- */
-
-	bust_spinlocks(1);
-
-	if (address < PAGE_SIZE)
-		printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
-	else
-		printk(KERN_ALERT "Unable to handle kernel paging request");
-	printk(" at virtual address %08lx\n",address);
-	printk(KERN_ALERT " printing bpc:\n");
-	printk("%08lx\n", regs->bpc);
-	page = *(unsigned long *)MPTB;
-	page = ((unsigned long *) page)[address >> PGDIR_SHIFT];
-	printk(KERN_ALERT "*pde = %08lx\n", page);
-	if (page & _PAGE_PRESENT) {
-		page &= PAGE_MASK;
-		address &= 0x003ff000;
-		page = ((unsigned long *) __va(page))[address >> PAGE_SHIFT];
-		printk(KERN_ALERT "*pte = %08lx\n", page);
-	}
-	die("Oops", regs, error_code);
-	bust_spinlocks(0);
-	do_exit(SIGKILL);
-
-/*
- * We ran out of memory, or some other thing happened to us that made
- * us unable to handle the page fault gracefully.
- */
-out_of_memory:
-	up_read(&mm->mmap_sem);
-	if (!(error_code & ACE_USERMODE))
-		goto no_context;
-	pagefault_out_of_memory();
-	return;
-
-do_sigbus:
-	up_read(&mm->mmap_sem);
-
-	/* Kernel mode? Handle exception or die */
-	if (!(error_code & ACE_USERMODE))
-		goto no_context;
-
-	tsk->thread.address = address;
-	tsk->thread.error_code = error_code;
-	tsk->thread.trap_no = 14;
-	info.si_signo = SIGBUS;
-	info.si_errno = 0;
-	info.si_code = BUS_ADRERR;
-	info.si_addr = (void __user *)address;
-	force_sig_info(SIGBUS, &info, tsk);
-	return;
-
-vmalloc_fault:
-	{
-		/*
-		 * Synchronize this task's top level page-table
-		 * with the 'reference' page table.
-		 *
-		 * Do _not_ use "tsk" here. We might be inside
-		 * an interrupt in the middle of a task switch..
-		 */
-		int offset = pgd_index(address);
-		pgd_t *pgd, *pgd_k;
-		pmd_t *pmd, *pmd_k;
-		pte_t *pte_k;
-
-		pgd = (pgd_t *)*(unsigned long *)MPTB;
-		pgd = offset + (pgd_t *)pgd;
-		pgd_k = init_mm.pgd + offset;
-
-		if (!pgd_present(*pgd_k))
-			goto no_context;
-
-		/*
-		 * set_pgd(pgd, *pgd_k); here would be useless on PAE
-		 * and redundant with the set_pmd() on non-PAE.
-		 */
-
-		pmd = pmd_offset(pgd, address);
-		pmd_k = pmd_offset(pgd_k, address);
-		if (!pmd_present(*pmd_k))
-			goto no_context;
-		set_pmd(pmd, *pmd_k);
-
-		pte_k = pte_offset_kernel(pmd_k, address);
-		if (!pte_present(*pte_k))
-			goto no_context;
-
-		addr = (address & PAGE_MASK);
-		set_thread_fault_code(error_code);
-		update_mmu_cache(NULL, addr, pte_k);
-		set_thread_fault_code(0);
-		return;
-	}
-}
-
-/*======================================================================*
- * update_mmu_cache()
- *======================================================================*/
-#define TLB_MASK	(NR_TLB_ENTRIES - 1)
-#define ITLB_END	(unsigned long *)(ITLB_BASE + (NR_TLB_ENTRIES * 8))
-#define DTLB_END	(unsigned long *)(DTLB_BASE + (NR_TLB_ENTRIES * 8))
-void update_mmu_cache(struct vm_area_struct *vma, unsigned long vaddr,
-	pte_t *ptep)
-{
-	volatile unsigned long *entry1, *entry2;
-	unsigned long pte_data, flags;
-	unsigned int *entry_dat;
-	int inst = get_thread_fault_code() & ACE_INSTRUCTION;
-	int i;
-
-	/* Ptrace may call this routine. */
-	if (vma && current->active_mm != vma->vm_mm)
-		return;
-
-	local_irq_save(flags);
-
-	vaddr = (vaddr & PAGE_MASK) | get_asid();
-
-	pte_data = pte_val(*ptep);
-
-#ifdef CONFIG_CHIP_OPSP
-	entry1 = (unsigned long *)ITLB_BASE;
-	for (i = 0; i < NR_TLB_ENTRIES; i++) {
-		if (*entry1++ == vaddr) {
-			set_tlb_data(entry1, pte_data);
-			break;
-		}
-		entry1++;
-	}
-	entry2 = (unsigned long *)DTLB_BASE;
-	for (i = 0; i < NR_TLB_ENTRIES; i++) {
-		if (*entry2++ == vaddr) {
-			set_tlb_data(entry2, pte_data);
-			break;
-		}
-		entry2++;
-	}
-#else
-	/*
-	 * Update TLB entries
-	 *  entry1: ITLB entry address
-	 *  entry2: DTLB entry address
-	 */
-	__asm__ __volatile__ (
-		"seth	%0, #high(%4)	\n\t"
-		"st	%2, @(%5, %0)	\n\t"
-		"ldi	%1, #1		\n\t"
-		"st	%1, @(%6, %0)	\n\t"
-		"add3	r4, %0, %7	\n\t"
-		".fillinsn		\n"
-		"1:			\n\t"
-		"ld	%1, @(%6, %0)	\n\t"
-		"bnez	%1, 1b		\n\t"
-		"ld	%0, @r4+	\n\t"
-		"ld	%1, @r4		\n\t"
-		"st	%3, @+%0	\n\t"
-		"st	%3, @+%1	\n\t"
-		: "=&r" (entry1), "=&r" (entry2)
-		: "r" (vaddr), "r" (pte_data), "i" (MMU_REG_BASE),
-		"i" (MSVA_offset), "i" (MTOP_offset), "i" (MIDXI_offset)
-		: "r4", "memory"
-	);
-#endif
-
-	if ((!inst && entry2 >= DTLB_END) || (inst && entry1 >= ITLB_END))
-		goto notfound;
-
-found:
-	local_irq_restore(flags);
-
-	return;
-
-	/* Valid entry not found */
-notfound:
-	/*
-	 * Update ITLB or DTLB entry
-	 *  entry1: TLB entry address
-	 *  entry2: TLB base address
-	 */
-	if (!inst) {
-		entry2 = (unsigned long *)DTLB_BASE;
-		entry_dat = &tlb_entry_d;
-	} else {
-		entry2 = (unsigned long *)ITLB_BASE;
-		entry_dat = &tlb_entry_i;
-	}
-	entry1 = entry2 + (((*entry_dat - 1) & TLB_MASK) << 1);
-
-	for (i = 0 ; i < NR_TLB_ENTRIES ; i++) {
-		if (!(entry1[1] & 2))	/* Valid bit check */
-			break;
-
-		if (entry1 != entry2)
-			entry1 -= 2;
-		else
-			entry1 += TLB_MASK << 1;
-	}
-
-	if (i >= NR_TLB_ENTRIES) {	/* Empty entry not found */
-		entry1 = entry2 + (*entry_dat << 1);
-		*entry_dat = (*entry_dat + 1) & TLB_MASK;
-	}
-	*entry1++ = vaddr;	/* Set TLB tag */
-	set_tlb_data(entry1, pte_data);
-
-	goto found;
-}
-
-/*======================================================================*
- * flush_tlb_page() : flushes one page
- *======================================================================*/
-void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
-	if (vma->vm_mm && mm_context(vma->vm_mm) != NO_CONTEXT) {
-		unsigned long flags;
-
-		local_irq_save(flags);
-		page &= PAGE_MASK;
-		page |= (mm_context(vma->vm_mm) & MMU_CONTEXT_ASID_MASK);
-		__flush_tlb_page(page);
-		local_irq_restore(flags);
-	}
-}
-
-/*======================================================================*
- * flush_tlb_range() : flushes a range of pages
- *======================================================================*/
-void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
-	unsigned long end)
-{
-	struct mm_struct *mm;
-
-	mm = vma->vm_mm;
-	if (mm_context(mm) != NO_CONTEXT) {
-		unsigned long flags;
-		int size;
-
-		local_irq_save(flags);
-		size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
-		if (size > (NR_TLB_ENTRIES / 4)) { /* Too many TLB to flush */
-			mm_context(mm) = NO_CONTEXT;
-			if (mm == current->mm)
-				activate_context(mm);
-		} else {
-			unsigned long asid;
-
-			asid = mm_context(mm) & MMU_CONTEXT_ASID_MASK;
-			start &= PAGE_MASK;
-			end += (PAGE_SIZE - 1);
-			end &= PAGE_MASK;
-
-			start |= asid;
-			end   |= asid;
-			while (start < end) {
-				__flush_tlb_page(start);
-				start += PAGE_SIZE;
-			}
-		}
-		local_irq_restore(flags);
-	}
-}
-
-/*======================================================================*
- * flush_tlb_mm() : flushes the specified mm context TLB's
- *======================================================================*/
-void local_flush_tlb_mm(struct mm_struct *mm)
-{
-	/* Invalidate all TLB of this process. */
-	/* Instead of invalidating each TLB, we get new MMU context. */
-	if (mm_context(mm) != NO_CONTEXT) {
-		unsigned long flags;
-
-		local_irq_save(flags);
-		mm_context(mm) = NO_CONTEXT;
-		if (mm == current->mm)
-			activate_context(mm);
-		local_irq_restore(flags);
-	}
-}
-
-/*======================================================================*
- * flush_tlb_all() : flushes all processes TLBs
- *======================================================================*/
-void local_flush_tlb_all(void)
-{
-	unsigned long flags;
-
-	local_irq_save(flags);
-	__flush_tlb_all();
-	local_irq_restore(flags);
-}
-
-/*======================================================================*
- * init_mmu()
- *======================================================================*/
-void __init init_mmu(void)
-{
-	tlb_entry_i = 0;
-	tlb_entry_d = 0;
-	mmu_context_cache = MMU_CONTEXT_FIRST_VERSION;
-	set_asid(mmu_context_cache & MMU_CONTEXT_ASID_MASK);
-	*(volatile unsigned long *)MPTB = (unsigned long)swapper_pg_dir;
-}