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