1 /* 2 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> 3 * Copyright (C) 2008-2009 PetaLogix 4 * Copyright (C) 2006 Atmark Techno, Inc. 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 11 #include <linux/cpu.h> 12 #include <linux/export.h> 13 #include <linux/sched.h> 14 #include <linux/pm.h> 15 #include <linux/tick.h> 16 #include <linux/bitops.h> 17 #include <linux/ptrace.h> 18 #include <asm/pgalloc.h> 19 #include <linux/uaccess.h> /* for USER_DS macros */ 20 #include <asm/cacheflush.h> 21 22 void show_regs(struct pt_regs *regs) 23 { 24 show_regs_print_info(KERN_INFO); 25 26 pr_info(" Registers dump: mode=%X\r\n", regs->pt_mode); 27 pr_info(" r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n", 28 regs->r1, regs->r2, regs->r3, regs->r4); 29 pr_info(" r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n", 30 regs->r5, regs->r6, regs->r7, regs->r8); 31 pr_info(" r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n", 32 regs->r9, regs->r10, regs->r11, regs->r12); 33 pr_info(" r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n", 34 regs->r13, regs->r14, regs->r15, regs->r16); 35 pr_info(" r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n", 36 regs->r17, regs->r18, regs->r19, regs->r20); 37 pr_info(" r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n", 38 regs->r21, regs->r22, regs->r23, regs->r24); 39 pr_info(" r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n", 40 regs->r25, regs->r26, regs->r27, regs->r28); 41 pr_info(" r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n", 42 regs->r29, regs->r30, regs->r31, regs->pc); 43 pr_info(" msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n", 44 regs->msr, regs->ear, regs->esr, regs->fsr); 45 } 46 47 void (*pm_power_off)(void) = NULL; 48 EXPORT_SYMBOL(pm_power_off); 49 50 void flush_thread(void) 51 { 52 } 53 54 int copy_thread(unsigned long clone_flags, unsigned long usp, 55 unsigned long arg, struct task_struct *p) 56 { 57 struct pt_regs *childregs = task_pt_regs(p); 58 struct thread_info *ti = task_thread_info(p); 59 60 if (unlikely(p->flags & PF_KTHREAD)) { 61 /* if we're creating a new kernel thread then just zeroing all 62 * the registers. That's OK for a brand new thread.*/ 63 memset(childregs, 0, sizeof(struct pt_regs)); 64 memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); 65 ti->cpu_context.r1 = (unsigned long)childregs; 66 ti->cpu_context.r20 = (unsigned long)usp; /* fn */ 67 ti->cpu_context.r19 = (unsigned long)arg; 68 childregs->pt_mode = 1; 69 local_save_flags(childregs->msr); 70 #ifdef CONFIG_MMU 71 ti->cpu_context.msr = childregs->msr & ~MSR_IE; 72 #endif 73 ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8; 74 return 0; 75 } 76 *childregs = *current_pt_regs(); 77 if (usp) 78 childregs->r1 = usp; 79 80 memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); 81 ti->cpu_context.r1 = (unsigned long)childregs; 82 #ifndef CONFIG_MMU 83 ti->cpu_context.msr = (unsigned long)childregs->msr; 84 #else 85 childregs->msr |= MSR_UMS; 86 87 /* we should consider the fact that childregs is a copy of the parent 88 * regs which were saved immediately after entering the kernel state 89 * before enabling VM. This MSR will be restored in switch_to and 90 * RETURN() and we want to have the right machine state there 91 * specifically this state must have INTs disabled before and enabled 92 * after performing rtbd 93 * compose the right MSR for RETURN(). It will work for switch_to also 94 * excepting for VM and UMS 95 * don't touch UMS , CARRY and cache bits 96 * right now MSR is a copy of parent one */ 97 childregs->msr &= ~MSR_EIP; 98 childregs->msr |= MSR_IE; 99 childregs->msr &= ~MSR_VM; 100 childregs->msr |= MSR_VMS; 101 childregs->msr |= MSR_EE; /* exceptions will be enabled*/ 102 103 ti->cpu_context.msr = (childregs->msr|MSR_VM); 104 ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */ 105 ti->cpu_context.msr &= ~MSR_IE; 106 #endif 107 ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8; 108 109 /* 110 * r21 is the thread reg, r10 is 6th arg to clone 111 * which contains TLS area 112 */ 113 if (clone_flags & CLONE_SETTLS) 114 childregs->r21 = childregs->r10; 115 116 return 0; 117 } 118 119 #ifndef CONFIG_MMU 120 /* 121 * Return saved PC of a blocked thread. 122 */ 123 unsigned long thread_saved_pc(struct task_struct *tsk) 124 { 125 struct cpu_context *ctx = 126 &(((struct thread_info *)(tsk->stack))->cpu_context); 127 128 /* Check whether the thread is blocked in resume() */ 129 if (in_sched_functions(ctx->r15)) 130 return (unsigned long)ctx->r15; 131 else 132 return ctx->r14; 133 } 134 #endif 135 136 unsigned long get_wchan(struct task_struct *p) 137 { 138 /* TBD (used by procfs) */ 139 return 0; 140 } 141 142 /* Set up a thread for executing a new program */ 143 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp) 144 { 145 regs->pc = pc; 146 regs->r1 = usp; 147 regs->pt_mode = 0; 148 #ifdef CONFIG_MMU 149 regs->msr |= MSR_UMS; 150 regs->msr &= ~MSR_VM; 151 #endif 152 } 153 154 #ifdef CONFIG_MMU 155 #include <linux/elfcore.h> 156 /* 157 * Set up a thread for executing a new program 158 */ 159 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs) 160 { 161 return 0; /* MicroBlaze has no separate FPU registers */ 162 } 163 #endif /* CONFIG_MMU */ 164 165 void arch_cpu_idle(void) 166 { 167 local_irq_enable(); 168 } 169