| /* |
| * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> |
| * Copyright (C) 2008-2009 PetaLogix |
| * Copyright (C) 2006 Atmark Techno, Inc. |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| */ |
| |
| #include <linux/cpu.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/pm.h> |
| #include <linux/tick.h> |
| #include <linux/bitops.h> |
| #include <linux/ptrace.h> |
| #include <asm/pgalloc.h> |
| #include <linux/uaccess.h> /* for USER_DS macros */ |
| #include <asm/cacheflush.h> |
| |
| void show_regs(struct pt_regs *regs) |
| { |
| show_regs_print_info(KERN_INFO); |
| |
| pr_info(" Registers dump: mode=%X\r\n", regs->pt_mode); |
| pr_info(" r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n", |
| regs->r1, regs->r2, regs->r3, regs->r4); |
| pr_info(" r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n", |
| regs->r5, regs->r6, regs->r7, regs->r8); |
| pr_info(" r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n", |
| regs->r9, regs->r10, regs->r11, regs->r12); |
| pr_info(" r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n", |
| regs->r13, regs->r14, regs->r15, regs->r16); |
| pr_info(" r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n", |
| regs->r17, regs->r18, regs->r19, regs->r20); |
| pr_info(" r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n", |
| regs->r21, regs->r22, regs->r23, regs->r24); |
| pr_info(" r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n", |
| regs->r25, regs->r26, regs->r27, regs->r28); |
| pr_info(" r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n", |
| regs->r29, regs->r30, regs->r31, regs->pc); |
| pr_info(" msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n", |
| regs->msr, regs->ear, regs->esr, regs->fsr); |
| } |
| |
| void (*pm_power_off)(void) = NULL; |
| EXPORT_SYMBOL(pm_power_off); |
| |
| void flush_thread(void) |
| { |
| } |
| |
| int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, |
| struct task_struct *p, unsigned long tls) |
| { |
| struct pt_regs *childregs = task_pt_regs(p); |
| struct thread_info *ti = task_thread_info(p); |
| |
| if (unlikely(p->flags & PF_KTHREAD)) { |
| /* if we're creating a new kernel thread then just zeroing all |
| * the registers. That's OK for a brand new thread.*/ |
| memset(childregs, 0, sizeof(struct pt_regs)); |
| memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); |
| ti->cpu_context.r1 = (unsigned long)childregs; |
| ti->cpu_context.r20 = (unsigned long)usp; /* fn */ |
| ti->cpu_context.r19 = (unsigned long)arg; |
| childregs->pt_mode = 1; |
| local_save_flags(childregs->msr); |
| #ifdef CONFIG_MMU |
| ti->cpu_context.msr = childregs->msr & ~MSR_IE; |
| #endif |
| ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8; |
| return 0; |
| } |
| *childregs = *current_pt_regs(); |
| if (usp) |
| childregs->r1 = usp; |
| |
| memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); |
| ti->cpu_context.r1 = (unsigned long)childregs; |
| #ifndef CONFIG_MMU |
| ti->cpu_context.msr = (unsigned long)childregs->msr; |
| #else |
| childregs->msr |= MSR_UMS; |
| |
| /* we should consider the fact that childregs is a copy of the parent |
| * regs which were saved immediately after entering the kernel state |
| * before enabling VM. This MSR will be restored in switch_to and |
| * RETURN() and we want to have the right machine state there |
| * specifically this state must have INTs disabled before and enabled |
| * after performing rtbd |
| * compose the right MSR for RETURN(). It will work for switch_to also |
| * excepting for VM and UMS |
| * don't touch UMS , CARRY and cache bits |
| * right now MSR is a copy of parent one */ |
| childregs->msr &= ~MSR_EIP; |
| childregs->msr |= MSR_IE; |
| childregs->msr &= ~MSR_VM; |
| childregs->msr |= MSR_VMS; |
| childregs->msr |= MSR_EE; /* exceptions will be enabled*/ |
| |
| ti->cpu_context.msr = (childregs->msr|MSR_VM); |
| ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */ |
| ti->cpu_context.msr &= ~MSR_IE; |
| #endif |
| ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8; |
| |
| /* |
| * r21 is the thread reg, r10 is 6th arg to clone |
| * which contains TLS area |
| */ |
| if (clone_flags & CLONE_SETTLS) |
| childregs->r21 = tls; |
| |
| return 0; |
| } |
| |
| unsigned long get_wchan(struct task_struct *p) |
| { |
| /* TBD (used by procfs) */ |
| return 0; |
| } |
| |
| /* Set up a thread for executing a new program */ |
| void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp) |
| { |
| regs->pc = pc; |
| regs->r1 = usp; |
| regs->pt_mode = 0; |
| #ifdef CONFIG_MMU |
| regs->msr |= MSR_UMS; |
| regs->msr &= ~MSR_VM; |
| #endif |
| } |
| |
| #ifdef CONFIG_MMU |
| #include <linux/elfcore.h> |
| /* |
| * Set up a thread for executing a new program |
| */ |
| int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs) |
| { |
| return 0; /* MicroBlaze has no separate FPU registers */ |
| } |
| #endif /* CONFIG_MMU */ |
| |
| void arch_cpu_idle(void) |
| { |
| local_irq_enable(); |
| } |