Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 280 insertions, 0 deletions

diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
new file mode 100644
index 0000000000..ed93bd8c15
--- /dev/null
+++ b/arch/parisc/kernel/process.c
@@ -0,0 +1,280 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *    PARISC Architecture-dependent parts of process handling
+ *    based on the work for i386
+ *
+ *    Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
+ *    Copyright (C) 2000 Martin K Petersen <mkp at mkp.net>
+ *    Copyright (C) 2000 John Marvin <jsm at parisc-linux.org>
+ *    Copyright (C) 2000 David Huggins-Daines <dhd with pobox.org>
+ *    Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
+ *    Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org>
+ *    Copyright (C) 2000 David Kennedy <dkennedy with linuxcare.com>
+ *    Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org>
+ *    Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org>
+ *    Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org>
+ *    Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org>
+ *    Copyright (C) 2001-2014 Helge Deller <deller@gmx.de>
+ *    Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
+ */
+#include <linux/elf.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/cpu.h>
+#include <linux/module.h>
+#include <linux/personality.h>
+#include <linux/ptrace.h>
+#include <linux/reboot.h>
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/task.h>
+#include <linux/sched/task_stack.h>
+#include <linux/slab.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/kallsyms.h>
+#include <linux/uaccess.h>
+#include <linux/rcupdate.h>
+#include <linux/random.h>
+#include <linux/nmi.h>
+#include <linux/sched/hotplug.h>
+
+#include <asm/io.h>
+#include <asm/asm-offsets.h>
+#include <asm/assembly.h>
+#include <asm/pdc.h>
+#include <asm/pdc_chassis.h>
+#include <asm/unwind.h>
+#include <asm/sections.h>
+#include <asm/cacheflush.h>
+
+#define COMMAND_GLOBAL  F_EXTEND(0xfffe0030)
+#define CMD_RESET       5       /* reset any module */
+
+/*
+** The Wright Brothers and Gecko systems have a H/W problem
+** (Lasi...'nuf said) may cause a broadcast reset to lockup
+** the system. An HVERSION dependent PDC call was developed
+** to perform a "safe", platform specific broadcast reset instead
+** of kludging up all the code.
+**
+** Older machines which do not implement PDC_BROADCAST_RESET will
+** return (with an error) and the regular broadcast reset can be
+** issued. Obviously, if the PDC does implement PDC_BROADCAST_RESET
+** the PDC call will not return (the system will be reset).
+*/
+void machine_restart(char *cmd)
+{
+#ifdef FASTBOOT_SELFTEST_SUPPORT
+	/*
+	 ** If user has modified the Firmware Selftest Bitmap,
+	 ** run the tests specified in the bitmap after the
+	 ** system is rebooted w/PDC_DO_RESET.
+	 **
+	 ** ftc_bitmap = 0x1AUL "Skip destructive memory tests"
+	 **
+	 ** Using "directed resets" at each processor with the MEM_TOC
+	 ** vector cleared will also avoid running destructive
+	 ** memory self tests. (Not implemented yet)
+	 */
+	if (ftc_bitmap) {
+		pdc_do_firm_test_reset(ftc_bitmap);
+	}
+#endif
+	/* set up a new led state on systems shipped with a LED State panel */
+	pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
+	
+	/* "Normal" system reset */
+	pdc_do_reset();
+
+	/* Nope...box should reset with just CMD_RESET now */
+	gsc_writel(CMD_RESET, COMMAND_GLOBAL);
+
+	/* Wait for RESET to lay us to rest. */
+	while (1) ;
+
+}
+
+/*
+ * This routine is called from sys_reboot to actually turn off the
+ * machine 
+ */
+void machine_power_off(void)
+{
+	/* Put the soft power button back under hardware control.
+	 * If the user had already pressed the power button, the
+	 * following call will immediately power off. */
+	pdc_soft_power_button(0);
+	
+	pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
+
+	/* ipmi_poweroff may have been installed. */
+	do_kernel_power_off();
+		
+	/* It seems we have no way to power the system off via
+	 * software. The user has to press the button himself. */
+
+	printk("Power off or press RETURN to reboot.\n");
+
+	/* prevent soft lockup/stalled CPU messages for endless loop. */
+	rcu_sysrq_start();
+	lockup_detector_soft_poweroff();
+	while (1) {
+		/* reboot if user presses RETURN key */
+		if (pdc_iodc_getc() == 13) {
+			printk("Rebooting...\n");
+			machine_restart(NULL);
+		}
+	}
+}
+
+void (*pm_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
+
+void machine_halt(void)
+{
+	machine_power_off();
+}
+
+void flush_thread(void)
+{
+	/* Only needs to handle fpu stuff or perf monitors.
+	** REVISIT: several arches implement a "lazy fpu state".
+	*/
+}
+
+/*
+ * Idle thread support
+ *
+ * Detect when running on QEMU with SeaBIOS PDC Firmware and let
+ * QEMU idle the host too.
+ */
+
+int running_on_qemu __ro_after_init;
+EXPORT_SYMBOL(running_on_qemu);
+
+/*
+ * Called from the idle thread for the CPU which has been shutdown.
+ */
+void __noreturn arch_cpu_idle_dead(void)
+{
+#ifdef CONFIG_HOTPLUG_CPU
+	idle_task_exit();
+
+	local_irq_disable();
+
+	/* Tell the core that this CPU is now safe to dispose of. */
+	cpuhp_ap_report_dead();
+
+	/* Ensure that the cache lines are written out. */
+	flush_cache_all_local();
+	flush_tlb_all_local(NULL);
+
+	/* Let PDC firmware put CPU into firmware idle loop. */
+	__pdc_cpu_rendezvous();
+
+	pr_warn("PDC does not provide rendezvous function.\n");
+#endif
+	while (1);
+}
+
+void __cpuidle arch_cpu_idle(void)
+{
+	/* nop on real hardware, qemu will idle sleep. */
+	asm volatile("or %%r10,%%r10,%%r10\n":::);
+}
+
+static int __init parisc_idle_init(void)
+{
+	if (!running_on_qemu)
+		cpu_idle_poll_ctrl(1);
+
+	return 0;
+}
+arch_initcall(parisc_idle_init);
+
+/*
+ * Copy architecture-specific thread state
+ */
+int
+copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
+{
+	unsigned long clone_flags = args->flags;
+	unsigned long usp = args->stack;
+	unsigned long tls = args->tls;
+	struct pt_regs *cregs = &(p->thread.regs);
+	void *stack = task_stack_page(p);
+	
+	/* We have to use void * instead of a function pointer, because
+	 * function pointers aren't a pointer to the function on 64-bit.
+	 * Make them const so the compiler knows they live in .text */
+	extern void * const ret_from_kernel_thread;
+	extern void * const child_return;
+
+	if (unlikely(args->fn)) {
+		/* kernel thread */
+		memset(cregs, 0, sizeof(struct pt_regs));
+		if (args->idle) /* idle thread */
+			return 0;
+		/* Must exit via ret_from_kernel_thread in order
+		 * to call schedule_tail()
+		 */
+		cregs->ksp = (unsigned long) stack + FRAME_SIZE + PT_SZ_ALGN;
+		cregs->kpc = (unsigned long) &ret_from_kernel_thread;
+		/*
+		 * Copy function and argument to be called from
+		 * ret_from_kernel_thread.
+		 */
+#ifdef CONFIG_64BIT
+		cregs->gr[27] = ((unsigned long *)args->fn)[3];
+		cregs->gr[26] = ((unsigned long *)args->fn)[2];
+#else
+		cregs->gr[26] = (unsigned long) args->fn;
+#endif
+		cregs->gr[25] = (unsigned long) args->fn_arg;
+	} else {
+		/* user thread */
+		/* usp must be word aligned.  This also prevents users from
+		 * passing in the value 1 (which is the signal for a special
+		 * return for a kernel thread) */
+		if (usp) {
+			usp = ALIGN(usp, 4);
+			if (likely(usp))
+				cregs->gr[30] = usp;
+		}
+		cregs->ksp = (unsigned long) stack + FRAME_SIZE;
+		cregs->kpc = (unsigned long) &child_return;
+
+		/* Setup thread TLS area */
+		if (clone_flags & CLONE_SETTLS)
+			cregs->cr27 = tls;
+	}
+
+	return 0;
+}
+
+unsigned long
+__get_wchan(struct task_struct *p)
+{
+	struct unwind_frame_info info;
+	unsigned long ip;
+	int count = 0;
+
+	/*
+	 * These bracket the sleeping functions..
+	 */
+
+	unwind_frame_init_from_blocked_task(&info, p);
+	do {
+		if (unwind_once(&info) < 0)
+			return 0;
+		if (task_is_running(p))
+                        return 0;
+		ip = info.ip;
+		if (!in_sched_functions(ip))
+			return ip;
+	} while (count++ < MAX_UNWIND_ENTRIES);
+	return 0;
+}