metag: Remove arch/metag/

The earliest Meta architecture port of Linux I have a record of was an
import of a Meta port of Linux v2.4.1 in February 2004, which was worked
on significantly over the next few years by Graham Whaley, Will Newton,
Matt Fleming, myself and others.

Eventually the port was merged into mainline in v3.9 in March 2013, not
long after Imagination Technologies bought MIPS Technologies and shifted
its CPU focus over to the MIPS architecture.

As a result, though the port was maintained for a while, kept on life
support for a while longer, and useful for testing a few specific
drivers for which I don't have ready access to the equivalent MIPS
hardware, it is now essentially dead with no users.

It is also stuck using an out-of-tree toolchain based on GCC 4.2.4 which
is no longer maintained, now struggles to build modern kernels due to
toolchain bugs, and doesn't itself build with a modern GCC. The latest
buildroot port is still using an old uClibc snapshot which is no longer
served, and the latest uClibc doesn't build with GCC 4.2.4.

So lets call it a day and drop the Meta architecture port from the
kernel. RIP Meta.

Signed-off-by: James Hogan <jhogan@kernel.org>
Link: https://lkml.kernel.org/r/95906b76-6ce1-3f84-eaba-c29b4ae952eb@roeck-us.net
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Graham Whaley <graham.whaley@gmail.com>
Cc: linux-metag@vger.kernel.org

1 files changed, 0 insertions, 448 deletions

diff --git a/arch/metag/kernel/process.c b/arch/metag/kernel/process.c
deleted file mode 100644
index 0909834c83a7..000000000000
--- a/arch/metag/kernel/process.c
+++ /dev/null
@@ -1,448 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2005,2006,2007,2008,2009,2010,2011 Imagination Technologies
- *
- * This file contains the architecture-dependent parts of process handling.
- *
- */
-
-#include <linux/errno.h>
-#include <linux/export.h>
-#include <linux/sched.h>
-#include <linux/sched/debug.h>
-#include <linux/sched/task.h>
-#include <linux/sched/task_stack.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/unistd.h>
-#include <linux/ptrace.h>
-#include <linux/user.h>
-#include <linux/reboot.h>
-#include <linux/elfcore.h>
-#include <linux/fs.h>
-#include <linux/tick.h>
-#include <linux/slab.h>
-#include <linux/mman.h>
-#include <linux/pm.h>
-#include <linux/syscalls.h>
-#include <linux/uaccess.h>
-#include <linux/smp.h>
-#include <asm/core_reg.h>
-#include <asm/user_gateway.h>
-#include <asm/tcm.h>
-#include <asm/traps.h>
-#include <asm/switch_to.h>
-
-/*
- * Wait for the next interrupt and enable local interrupts
- */
-void arch_cpu_idle(void)
-{
-	int tmp;
-
-	/*
-	 * Quickly jump straight into the interrupt entry point without actually
-	 * triggering an interrupt. When TXSTATI gets read the processor will
-	 * block until an interrupt is triggered.
-	 */
-	asm volatile (/* Switch into ISTAT mode */
-		      "RTH\n\t"
-		      /* Enable local interrupts */
-		      "MOV	TXMASKI, %1\n\t"
-		      /*
-		       * We can't directly "SWAP PC, PCX", so we swap via a
-		       * temporary. Essentially we do:
-		       *  PCX_new = 1f (the place to continue execution)
-		       *  PC = PCX_old
-		       */
-		      "ADD	%0, CPC0, #(1f-.)\n\t"
-		      "SWAP	PCX, %0\n\t"
-		      "MOV	PC, %0\n"
-		      /* Continue execution here with interrupts enabled */
-		      "1:"
-		      : "=a" (tmp)
-		      : "r" (get_trigger_mask()));
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-void arch_cpu_idle_dead(void)
-{
-	cpu_die();
-}
-#endif
-
-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
-void (*soc_restart)(char *cmd);
-void (*soc_halt)(void);
-
-void machine_restart(char *cmd)
-{
-	if (soc_restart)
-		soc_restart(cmd);
-	hard_processor_halt(HALT_OK);
-}
-
-void machine_halt(void)
-{
-	if (soc_halt)
-		soc_halt();
-	smp_send_stop();
-	hard_processor_halt(HALT_OK);
-}
-
-void machine_power_off(void)
-{
-	if (pm_power_off)
-		pm_power_off();
-	smp_send_stop();
-	hard_processor_halt(HALT_OK);
-}
-
-#define FLAG_Z 0x8
-#define FLAG_N 0x4
-#define FLAG_O 0x2
-#define FLAG_C 0x1
-
-void show_regs(struct pt_regs *regs)
-{
-	int i;
-	const char *AX0_names[] = {"A0StP", "A0FrP"};
-	const char *AX1_names[] = {"A1GbP", "A1LbP"};
-
-	const char *DX0_names[] = {
-		"D0Re0",
-		"D0Ar6",
-		"D0Ar4",
-		"D0Ar2",
-		"D0FrT",
-		"D0.5 ",
-		"D0.6 ",
-		"D0.7 "
-	};
-
-	const char *DX1_names[] = {
-		"D1Re0",
-		"D1Ar5",
-		"D1Ar3",
-		"D1Ar1",
-		"D1RtP",
-		"D1.5 ",
-		"D1.6 ",
-		"D1.7 "
-	};
-
-	show_regs_print_info(KERN_INFO);
-
-	pr_info(" pt_regs @ %p\n", regs);
-	pr_info(" SaveMask = 0x%04hx\n", regs->ctx.SaveMask);
-	pr_info(" Flags = 0x%04hx (%c%c%c%c)\n", regs->ctx.Flags,
-		regs->ctx.Flags & FLAG_Z ? 'Z' : 'z',
-		regs->ctx.Flags & FLAG_N ? 'N' : 'n',
-		regs->ctx.Flags & FLAG_O ? 'O' : 'o',
-		regs->ctx.Flags & FLAG_C ? 'C' : 'c');
-	pr_info(" TXRPT = 0x%08x\n", regs->ctx.CurrRPT);
-	pr_info(" PC = 0x%08x\n", regs->ctx.CurrPC);
-
-	/* AX regs */
-	for (i = 0; i < 2; i++) {
-		pr_info(" %s = 0x%08x    ",
-			AX0_names[i],
-			regs->ctx.AX[i].U0);
-		printk(" %s = 0x%08x\n",
-			AX1_names[i],
-			regs->ctx.AX[i].U1);
-	}
-
-	if (regs->ctx.SaveMask & TBICTX_XEXT_BIT)
-		pr_warn(" Extended state present - AX2.[01] will be WRONG\n");
-
-	/* Special place with AXx.2 */
-	pr_info(" A0.2  = 0x%08x    ",
-		regs->ctx.Ext.AX2.U0);
-	printk(" A1.2  = 0x%08x\n",
-		regs->ctx.Ext.AX2.U1);
-
-	/* 'extended' AX regs (nominally, just AXx.3) */
-	for (i = 0; i < (TBICTX_AX_REGS - 3); i++) {
-		pr_info(" A0.%d  = 0x%08x    ", i + 3, regs->ctx.AX3[i].U0);
-		printk(" A1.%d  = 0x%08x\n", i + 3, regs->ctx.AX3[i].U1);
-	}
-
-	for (i = 0; i < 8; i++) {
-		pr_info(" %s = 0x%08x    ", DX0_names[i], regs->ctx.DX[i].U0);
-		printk(" %s = 0x%08x\n", DX1_names[i], regs->ctx.DX[i].U1);
-	}
-
-	show_trace(NULL, (unsigned long *)regs->ctx.AX[0].U0, regs);
-}
-
-/*
- * Copy architecture-specific thread state
- */
-int copy_thread(unsigned long clone_flags, unsigned long usp,
-		unsigned long kthread_arg, struct task_struct *tsk)
-{
-	struct pt_regs *childregs = task_pt_regs(tsk);
-	void *kernel_context = ((void *) childregs +
-				sizeof(struct pt_regs));
-	unsigned long global_base;
-
-	BUG_ON(((unsigned long)childregs) & 0x7);
-	BUG_ON(((unsigned long)kernel_context) & 0x7);
-
-	memset(&tsk->thread.kernel_context, 0,
-			sizeof(tsk->thread.kernel_context));
-
-	tsk->thread.kernel_context = __TBISwitchInit(kernel_context,
-						     ret_from_fork,
-						     0, 0);
-
-	if (unlikely(tsk->flags & PF_KTHREAD)) {
-		/*
-		 * Make sure we don't leak any kernel data to child's regs
-		 * if kernel thread becomes a userspace thread in the future
-		 */
-		memset(childregs, 0 , sizeof(struct pt_regs));
-
-		global_base = __core_reg_get(A1GbP);
-		childregs->ctx.AX[0].U1 = (unsigned long) global_base;
-		childregs->ctx.AX[0].U0 = (unsigned long) kernel_context;
-		/* Set D1Ar1=kthread_arg and D1RtP=usp (fn) */
-		childregs->ctx.DX[4].U1 = usp;
-		childregs->ctx.DX[3].U1 = kthread_arg;
-		tsk->thread.int_depth = 2;
-		return 0;
-	}
-
-	/*
-	 * Get a pointer to where the new child's register block should have
-	 * been pushed.
-	 * The Meta's stack grows upwards, and the context is the the first
-	 * thing to be pushed by TBX (phew)
-	 */
-	*childregs = *current_pt_regs();
-	/* Set the correct stack for the clone mode */
-	if (usp)
-		childregs->ctx.AX[0].U0 = ALIGN(usp, 8);
-	tsk->thread.int_depth = 1;
-
-	/* set return value for child process */
-	childregs->ctx.DX[0].U0 = 0;
-
-	/* The TLS pointer is passed as an argument to sys_clone. */
-	if (clone_flags & CLONE_SETTLS)
-		tsk->thread.tls_ptr =
-				(__force void __user *)childregs->ctx.DX[1].U1;
-
-#ifdef CONFIG_METAG_FPU
-	if (tsk->thread.fpu_context) {
-		struct meta_fpu_context *ctx;
-
-		ctx = kmemdup(tsk->thread.fpu_context,
-			      sizeof(struct meta_fpu_context), GFP_ATOMIC);
-		tsk->thread.fpu_context = ctx;
-	}
-#endif
-
-#ifdef CONFIG_METAG_DSP
-	if (tsk->thread.dsp_context) {
-		struct meta_ext_context *ctx;
-		int i;
-
-		ctx = kmemdup(tsk->thread.dsp_context,
-			      sizeof(struct meta_ext_context), GFP_ATOMIC);
-		for (i = 0; i < 2; i++)
-			ctx->ram[i] = kmemdup(ctx->ram[i], ctx->ram_sz[i],
-					      GFP_ATOMIC);
-		tsk->thread.dsp_context = ctx;
-	}
-#endif
-
-	return 0;
-}
-
-#ifdef CONFIG_METAG_FPU
-static void alloc_fpu_context(struct thread_struct *thread)
-{
-	thread->fpu_context = kzalloc(sizeof(struct meta_fpu_context),
-				      GFP_ATOMIC);
-}
-
-static void clear_fpu(struct thread_struct *thread)
-{
-	thread->user_flags &= ~TBICTX_FPAC_BIT;
-	kfree(thread->fpu_context);
-	thread->fpu_context = NULL;
-}
-#else
-static void clear_fpu(struct thread_struct *thread)
-{
-}
-#endif
-
-#ifdef CONFIG_METAG_DSP
-static void clear_dsp(struct thread_struct *thread)
-{
-	if (thread->dsp_context) {
-		kfree(thread->dsp_context->ram[0]);
-		kfree(thread->dsp_context->ram[1]);
-
-		kfree(thread->dsp_context);
-
-		thread->dsp_context = NULL;
-	}
-
-	__core_reg_set(D0.8, 0);
-}
-#else
-static void clear_dsp(struct thread_struct *thread)
-{
-}
-#endif
-
-struct task_struct *__sched __switch_to(struct task_struct *prev,
-					struct task_struct *next)
-{
-	TBIRES to, from;
-
-	to.Switch.pCtx = next->thread.kernel_context;
-	to.Switch.pPara = prev;
-
-#ifdef CONFIG_METAG_FPU
-	if (prev->thread.user_flags & TBICTX_FPAC_BIT) {
-		struct pt_regs *regs = task_pt_regs(prev);
-		TBIRES state;
-
-		state.Sig.SaveMask = prev->thread.user_flags;
-		state.Sig.pCtx = &regs->ctx;
-
-		if (!prev->thread.fpu_context)
-			alloc_fpu_context(&prev->thread);
-		if (prev->thread.fpu_context)
-			__TBICtxFPUSave(state, prev->thread.fpu_context);
-	}
-	/*
-	 * Force a restore of the FPU context next time this process is
-	 * scheduled.
-	 */
-	if (prev->thread.fpu_context)
-		prev->thread.fpu_context->needs_restore = true;
-#endif
-
-
-	from = __TBISwitch(to, &prev->thread.kernel_context);
-
-	/* Restore TLS pointer for this process. */
-	set_gateway_tls(current->thread.tls_ptr);
-
-	return (struct task_struct *) from.Switch.pPara;
-}
-
-void flush_thread(void)
-{
-	clear_fpu(&current->thread);
-	clear_dsp(&current->thread);
-}
-
-/*
- * Free current thread data structures etc.
- */
-void exit_thread(struct task_struct *tsk)
-{
-	clear_fpu(&tsk->thread);
-	clear_dsp(&tsk->thread);
-}
-
-/* TODO: figure out how to unwind the kernel stack here to figure out
- * where we went to sleep. */
-unsigned long get_wchan(struct task_struct *p)
-{
-	return 0;
-}
-
-int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
-{
-	/* Returning 0 indicates that the FPU state was not stored (as it was
-	 * not in use) */
-	return 0;
-}
-
-#ifdef CONFIG_METAG_USER_TCM
-
-#define ELF_MIN_ALIGN	PAGE_SIZE
-
-#define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
-#define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
-#define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
-
-#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
-
-unsigned long __metag_elf_map(struct file *filep, unsigned long addr,
-			      struct elf_phdr *eppnt, int prot, int type,
-			      unsigned long total_size)
-{
-	unsigned long map_addr, size;
-	unsigned long page_off = ELF_PAGEOFFSET(eppnt->p_vaddr);
-	unsigned long raw_size = eppnt->p_filesz + page_off;
-	unsigned long off = eppnt->p_offset - page_off;
-	unsigned int tcm_tag;
-	addr = ELF_PAGESTART(addr);
-	size = ELF_PAGEALIGN(raw_size);
-
-	/* mmap() will return -EINVAL if given a zero size, but a
-	 * segment with zero filesize is perfectly valid */
-	if (!size)
-		return addr;
-
-	tcm_tag = tcm_lookup_tag(addr);
-
-	if (tcm_tag != TCM_INVALID_TAG)
-		type &= ~MAP_FIXED;
-
-	/*
-	* total_size is the size of the ELF (interpreter) image.
-	* The _first_ mmap needs to know the full size, otherwise
-	* randomization might put this image into an overlapping
-	* position with the ELF binary image. (since size < total_size)
-	* So we first map the 'big' image - and unmap the remainder at
-	* the end. (which unmap is needed for ELF images with holes.)
-	*/
-	if (total_size) {
-		total_size = ELF_PAGEALIGN(total_size);
-		map_addr = vm_mmap(filep, addr, total_size, prot, type, off);
-		if (!BAD_ADDR(map_addr))
-			vm_munmap(map_addr+size, total_size-size);
-	} else
-		map_addr = vm_mmap(filep, addr, size, prot, type, off);
-
-	if (!BAD_ADDR(map_addr) && tcm_tag != TCM_INVALID_TAG) {
-		struct tcm_allocation *tcm;
-		unsigned long tcm_addr;
-
-		tcm = kmalloc(sizeof(*tcm), GFP_KERNEL);
-		if (!tcm)
-			return -ENOMEM;
-
-		tcm_addr = tcm_alloc(tcm_tag, raw_size);
-		if (tcm_addr != addr) {
-			kfree(tcm);
-			return -ENOMEM;
-		}
-
-		tcm->tag = tcm_tag;
-		tcm->addr = tcm_addr;
-		tcm->size = raw_size;
-
-		list_add(&tcm->list, &current->mm->context.tcm);
-
-		eppnt->p_vaddr = map_addr;
-		if (copy_from_user((void *) addr, (void __user *) map_addr,
-				   raw_size))
-			return -EFAULT;
-	}
-
-	return map_addr;
-}
-#endif