first commit

1 files changed, 532 insertions, 0 deletions

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
new file mode 100644
index 000000000..ad14dbc07
--- /dev/null
+++ b/arch/arm64/kernel/process.c
@@ -0,0 +1,532 @@
+/*
+ * Based on arch/arm/kernel/process.c
+ *
+ * Original Copyright (C) 1995  Linus Torvalds
+ * Copyright (C) 1996-2000 Russell King - Converted to ARM.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdarg.h>
+
+#include <linux/compat.h>
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/user.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/interrupt.h>
+#include <linux/kallsyms.h>
+#include <linux/init.h>
+#include <linux/cpu.h>
+#include <linux/elfcore.h>
+#include <linux/pm.h>
+#include <linux/tick.h>
+#include <linux/utsname.h>
+#include <linux/uaccess.h>
+#include <linux/random.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/cpuidle.h>
+#include <linux/leds.h>
+#include <linux/personality.h>
+#include <linux/notifier.h>
+#include <linux/mtk_ram_console.h>
+
+#include <asm/compat.h>
+#include <asm/cacheflush.h>
+#include <asm/fpsimd.h>
+#include <asm/mmu_context.h>
+#include <asm/processor.h>
+#include <asm/stacktrace.h>
+
+extern void arch_reset(char mode, const char *cmd);
+
+static void setup_restart(void)
+{
+	/*
+	 * Tell the mm system that we are going to reboot -
+	 * we may need it to insert some 1:1 mappings so that
+	 * soft boot works.
+	 */
+	setup_mm_for_reboot();
+
+	/* Clean and invalidate caches */
+	flush_cache_all();
+
+	/* Turn D-cache off */
+	cpu_cache_off();
+
+	/* Push out any further dirty data, and ensure cache is empty */
+	flush_cache_all();
+}
+
+void soft_restart(unsigned long addr)
+{
+	setup_restart();
+	cpu_reset(addr);
+}
+
+/*
+ * Function pointers to optional machine specific functions
+ */
+void (*pm_power_off)(void);
+EXPORT_SYMBOL_GPL(pm_power_off);
+
+void (*arm_pm_restart)(char str, const char *cmd);
+EXPORT_SYMBOL_GPL(arm_pm_restart);
+
+/*
+ * This is our default idle handler.
+ */
+
+void (*arm_pm_idle)(void);	 
+
+static void default_idle(void)
+{
+	if (arm_pm_idle)
+		arm_pm_idle();
+	else
+		cpu_do_idle();
+	local_irq_enable();
+}
+
+void arch_cpu_idle_prepare(void)
+{
+	local_fiq_enable();
+}
+
+void arch_cpu_idle_enter(void)
+{
+	idle_notifier_call_chain(IDLE_START);
+	ledtrig_cpu(CPU_LED_IDLE_START);
+#ifdef CONFIG_PL310_ERRATA_769419
+	wmb();
+#endif
+}
+
+void arch_cpu_idle_exit(void)
+{
+	ledtrig_cpu(CPU_LED_IDLE_END);
+	idle_notifier_call_chain(IDLE_END);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+void arch_cpu_idle_dead(void)
+{
+       cpu_die();
+}
+#endif
+
+/*
+ * Called from the core idle loop.
+ */
+void arch_cpu_idle(void)
+{
+	if (cpuidle_idle_call())
+		default_idle();
+}
+
+void machine_shutdown(void)
+{
+#ifdef CONFIG_SMP
+	smp_send_stop();
+#endif
+}
+
+void machine_halt(void)
+{
+	machine_shutdown();
+	while (1);
+}
+
+extern int reboot_pid;
+//static int reboot_pid = 0;
+
+void machine_power_off(void)
+{
+	struct task_struct *tsk;
+	/* Disable interrupts first */
+	local_irq_disable();
+	local_fiq_disable();
+	
+	machine_shutdown();
+	if(reboot_pid > 1)
+	{
+		tsk = find_task_by_vpid(reboot_pid);
+		if(tsk == NULL)
+			tsk = current;		
+		dump_stack();
+	}
+	else
+	{
+		tsk = current;
+	}
+
+	if(tsk->real_parent)
+	{
+	 if(tsk->real_parent->real_parent)
+	 {
+	   printk("machine_shutdown: start, Proess(%s:%d). father %s:%d. grandfather %s:%d.\n",
+		tsk->comm, tsk->pid,tsk->real_parent->comm,tsk->real_parent->pid,
+		tsk->real_parent->real_parent->comm,tsk->real_parent->real_parent->pid);
+	 }
+	 else
+	 {
+	   printk("machine_shutdown: start, Proess(%s:%d). father %s:%d.\n", 
+		tsk->comm, tsk->pid,tsk->real_parent->comm,tsk->real_parent->pid);
+	 }
+	}
+	else
+	{
+	  printk("machine_shutdown: start, Proess(%s:%d)\n", tsk->comm, tsk->pid);	  
+	}
+
+#ifdef CONFIG_MTK_EMMC_SUPPORT 
+	last_kmsg_store_to_emmc();
+#endif
+	if (pm_power_off)
+		pm_power_off();
+}
+
+void machine_restart(char *cmd)
+{
+	struct task_struct *tsk;	
+
+	/* Disable interrupts first */
+	local_irq_disable();
+	local_fiq_disable();
+	
+	machine_shutdown();
+
+	if(reboot_pid > 1)
+	{
+		tsk = find_task_by_vpid(reboot_pid);
+		if(tsk == NULL)
+			tsk = current;		
+		dump_stack();
+	}
+	else
+	{
+		tsk = current;
+	}
+
+	if(tsk->real_parent)
+	{
+	 if(tsk->real_parent->real_parent)
+	 {
+	   printk("machine_shutdown: start, Proess(%s:%d). father %s:%d. grandfather %s:%d.\n",
+		tsk->comm, tsk->pid,tsk->real_parent->comm,tsk->real_parent->pid,
+		tsk->real_parent->real_parent->comm,tsk->real_parent->real_parent->pid);
+	 }
+	 else
+	 {
+	   printk("machine_shutdown: start, Proess(%s:%d). father %s:%d.\n", 
+		tsk->comm, tsk->pid,tsk->real_parent->comm,tsk->real_parent->pid);
+	 }
+	}
+	else
+	{
+	  printk("machine_shutdown: start, Proess(%s:%d)\n", tsk->comm, tsk->pid);	  
+	}
+
+	/* Now call the architecture specific reboot code. */
+	if (arm_pm_restart)
+		arm_pm_restart('h', cmd);
+#ifndef CONFIG_MTK_FPGA
+	else
+		arch_reset('h', cmd);
+#endif
+	/*
+	 * Whoops - the architecture was unable to reboot.
+	 */
+	printk("Reboot failed -- System halted\n");
+	while (1);
+}
+
+/*
+ * dump a block of kernel memory from around the given address
+ */
+static void show_data(unsigned long addr, int nbytes, const char *name)
+{
+	int	i, j;
+	int	nlines;
+	u32	*p;
+
+	/*
+	 * don't attempt to dump non-kernel addresses or
+	 * values that are probably just small negative numbers
+	 */
+	if (addr < PAGE_OFFSET || addr > -256UL)
+		return;
+
+	printk("\n%s: %#lx:\n", name, addr);
+
+	/*
+	 * round address down to a 32 bit boundary
+	 * and always dump a multiple of 32 bytes
+	 */
+	p = (u32 *)(addr & ~(sizeof(u32) - 1));
+	nbytes += (addr & (sizeof(u32) - 1));
+	nlines = (nbytes + 31) / 32;
+
+
+	for (i = 0; i < nlines; i++) {
+		/*
+		 * just display low 16 bits of address to keep
+		 * each line of the dump < 80 characters
+		 */
+		printk("%04lx ", (unsigned long)p & 0xffff);
+		for (j = 0; j < 8; j++) {
+			u32	data;
+			if (probe_kernel_address(p, data)) {
+				printk(" ********");
+			} else {
+				printk(" %08x", data);
+			}
+			++p;
+		}
+		printk("\n");
+	}
+}
+
+static void show_extra_register_data(struct pt_regs *regs, int nbytes)
+{
+	mm_segment_t fs;
+	unsigned int i;
+
+	fs = get_fs();
+	set_fs(KERNEL_DS);
+	show_data(regs->pc - nbytes, nbytes * 2, "PC");
+	show_data(regs->regs[30] - nbytes, nbytes * 2, "LR");
+	show_data(regs->sp - nbytes, nbytes * 2, "SP");
+	for (i = 0; i < 30; i++) {
+		char name[4];
+		snprintf(name, sizeof(name), "X%u", i);
+		show_data(regs->regs[i] - nbytes, nbytes * 2, name);
+	}
+	set_fs(fs);
+}
+
+void __show_regs(struct pt_regs *regs)
+{
+	int i;
+
+	show_regs_print_info(KERN_DEFAULT);
+	print_symbol("PC is at %s\n", instruction_pointer(regs));
+	print_symbol("LR is at %s\n", regs->regs[30]);
+	printk("pc : [<%016llx>] lr : [<%016llx>] pstate: %08llx\n",
+	       regs->pc, regs->regs[30], regs->pstate);
+	printk("sp : %016llx\n", regs->sp);
+	for (i = 29; i >= 0; i--) {
+		printk("x%-2d: %016llx ", i, regs->regs[i]);
+		if (i % 2 == 0)
+			printk("\n");
+	}
+	if (!user_mode(regs))
+		show_extra_register_data(regs, 128);
+	printk("\n");
+}
+
+void show_regs(struct pt_regs * regs)
+{
+	printk("\n");
+	__show_regs(regs);
+}
+
+/*
+ * Free current thread data structures etc..
+ */
+void exit_thread(void)
+{
+}
+
+static void tls_thread_flush(void)
+{
+	asm ("msr tpidr_el0, xzr");
+
+	if (is_compat_task()) {
+		current->thread.tp_value = 0;
+
+		/*
+		 * We need to ensure ordering between the shadow state and the
+		 * hardware state, so that we don't corrupt the hardware state
+		 * with a stale shadow state during context switch.
+		 */
+		barrier();
+		asm ("msr tpidrro_el0, xzr");
+	}
+}
+
+void flush_thread(void)
+{
+	fpsimd_flush_thread();
+	tls_thread_flush();
+	flush_ptrace_hw_breakpoint(current);
+}
+
+void release_thread(struct task_struct *dead_task)
+{
+}
+
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+	fpsimd_preserve_current_state();
+	*dst = *src;
+	return 0;
+}
+
+asmlinkage void ret_from_fork(void) asm("ret_from_fork");
+
+int copy_thread(unsigned long clone_flags, unsigned long stack_start,
+		unsigned long stk_sz, struct task_struct *p)
+{
+	struct pt_regs *childregs = task_pt_regs(p);
+	unsigned long tls = p->thread.tp_value;
+
+	memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));
+
+	if (likely(!(p->flags & PF_KTHREAD))) {
+		*childregs = *current_pt_regs();
+		childregs->regs[0] = 0;
+		if (is_compat_thread(task_thread_info(p))) {
+			if (stack_start)
+				childregs->compat_sp = stack_start;
+		} else {
+			/*
+			 * Read the current TLS pointer from tpidr_el0 as it may be
+			 * out-of-sync with the saved value.
+			 */
+			asm("mrs %0, tpidr_el0" : "=r" (tls));
+			if (stack_start) {
+				/* 16-byte aligned stack mandatory on AArch64 */
+				if (stack_start & 15)
+					return -EINVAL;
+				childregs->sp = stack_start;
+			}
+		}
+		/*
+		 * If a TLS pointer was passed to clone (4th argument), use it
+		 * for the new thread.
+		 */
+		if (clone_flags & CLONE_SETTLS)
+			tls = childregs->regs[3];
+	} else {
+		memset(childregs, 0, sizeof(struct pt_regs));
+		childregs->pstate = PSR_MODE_EL1h;
+		p->thread.cpu_context.x19 = stack_start;
+		p->thread.cpu_context.x20 = stk_sz;
+	}
+	p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
+	p->thread.cpu_context.sp = (unsigned long)childregs;
+	p->thread.tp_value = tls;
+
+	ptrace_hw_copy_thread(p);
+
+	return 0;
+}
+
+static void tls_thread_switch(struct task_struct *next)
+{
+	unsigned long tpidr, tpidrro;
+
+	if (!is_compat_task()) {
+		asm("mrs %0, tpidr_el0" : "=r" (tpidr));
+		current->thread.tp_value = tpidr;
+	}
+
+	if (is_compat_thread(task_thread_info(next))) {
+		tpidr = 0;
+		tpidrro = next->thread.tp_value;
+	} else {
+		tpidr = next->thread.tp_value;
+		tpidrro = 0;
+	}
+
+	asm(
+	"	msr	tpidr_el0, %0\n"
+	"	msr	tpidrro_el0, %1"
+	: : "r" (tpidr), "r" (tpidrro));
+}
+
+/*
+ * Thread switching.
+ */
+struct task_struct *__switch_to(struct task_struct *prev,
+				struct task_struct *next)
+{
+	struct task_struct *last;
+
+	fpsimd_thread_switch(next);
+	tls_thread_switch(next);
+	hw_breakpoint_thread_switch(next);
+	contextidr_thread_switch(next);
+
+	/*
+	 * Complete any pending TLB or cache maintenance on this CPU in case
+	 * the thread migrates to a different CPU.
+	 */
+	dsb();
+
+	/* the actual thread switch */
+	last = cpu_switch_to(prev, next);
+
+	return last;
+}
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	struct stackframe frame;
+	int count = 0;
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+
+	frame.fp = thread_saved_fp(p);
+	frame.sp = thread_saved_sp(p);
+	frame.pc = thread_saved_pc(p);
+	do {
+		int ret = unwind_frame(&frame);
+		if (ret < 0)
+			return 0;
+		if (!in_sched_functions(frame.pc))
+			return frame.pc;
+	} while (count ++ < 16);
+	return 0;
+}
+
+unsigned long arch_align_stack(unsigned long sp)
+{
+	if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+		sp -= get_random_int() & ~PAGE_MASK;
+	return sp & ~0xf;
+}
+
+static unsigned long randomize_base(unsigned long base)
+{
+	unsigned long range_end = base + (STACK_RND_MASK << PAGE_SHIFT) + 1;
+	return randomize_range(base, range_end, 0) ? : base;
+}
+
+unsigned long arch_randomize_brk(struct mm_struct *mm)
+{
+	return randomize_base(mm->brk);
+}
+
+unsigned long randomize_et_dyn(unsigned long base)
+{
+	return randomize_base(base);
+}