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6496a23a MS |
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 | ||
579907e6 | 11 | #include <linux/cpu.h> |
d64af918 | 12 | #include <linux/export.h> |
6496a23a | 13 | #include <linux/sched.h> |
b17b0153 | 14 | #include <linux/sched/debug.h> |
29930025 | 15 | #include <linux/sched/task.h> |
68db0cf1 | 16 | #include <linux/sched/task_stack.h> |
6496a23a MS |
17 | #include <linux/pm.h> |
18 | #include <linux/tick.h> | |
19 | #include <linux/bitops.h> | |
f3268edb | 20 | #include <linux/ptrace.h> |
6496a23a | 21 | #include <asm/pgalloc.h> |
6bd55f0b | 22 | #include <linux/uaccess.h> /* for USER_DS macros */ |
a1f55113 | 23 | #include <asm/cacheflush.h> |
6496a23a MS |
24 | |
25 | void show_regs(struct pt_regs *regs) | |
26 | { | |
a43cb95d TH |
27 | show_regs_print_info(KERN_INFO); |
28 | ||
6bd55f0b MS |
29 | pr_info(" Registers dump: mode=%X\r\n", regs->pt_mode); |
30 | pr_info(" r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n", | |
6496a23a | 31 | regs->r1, regs->r2, regs->r3, regs->r4); |
6bd55f0b | 32 | pr_info(" r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n", |
6496a23a | 33 | regs->r5, regs->r6, regs->r7, regs->r8); |
6bd55f0b | 34 | pr_info(" r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n", |
6496a23a | 35 | regs->r9, regs->r10, regs->r11, regs->r12); |
6bd55f0b | 36 | pr_info(" r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n", |
6496a23a | 37 | regs->r13, regs->r14, regs->r15, regs->r16); |
6bd55f0b | 38 | pr_info(" r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n", |
6496a23a | 39 | regs->r17, regs->r18, regs->r19, regs->r20); |
6bd55f0b | 40 | pr_info(" r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n", |
6496a23a | 41 | regs->r21, regs->r22, regs->r23, regs->r24); |
6bd55f0b | 42 | pr_info(" r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n", |
6496a23a | 43 | regs->r25, regs->r26, regs->r27, regs->r28); |
6bd55f0b | 44 | pr_info(" r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n", |
6496a23a | 45 | regs->r29, regs->r30, regs->r31, regs->pc); |
6bd55f0b | 46 | pr_info(" msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n", |
6496a23a | 47 | regs->msr, regs->ear, regs->esr, regs->fsr); |
6496a23a MS |
48 | } |
49 | ||
6496a23a MS |
50 | void (*pm_power_off)(void) = NULL; |
51 | EXPORT_SYMBOL(pm_power_off); | |
52 | ||
6496a23a MS |
53 | void flush_thread(void) |
54 | { | |
55 | } | |
56 | ||
a8fb748e | 57 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
afa86fc4 | 58 | unsigned long arg, struct task_struct *p) |
6496a23a MS |
59 | { |
60 | struct pt_regs *childregs = task_pt_regs(p); | |
61 | struct thread_info *ti = task_thread_info(p); | |
62 | ||
2319295d AV |
63 | if (unlikely(p->flags & PF_KTHREAD)) { |
64 | /* if we're creating a new kernel thread then just zeroing all | |
65 | * the registers. That's OK for a brand new thread.*/ | |
66 | memset(childregs, 0, sizeof(struct pt_regs)); | |
67 | memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); | |
68 | ti->cpu_context.r1 = (unsigned long)childregs; | |
69 | ti->cpu_context.r20 = (unsigned long)usp; /* fn */ | |
70 | ti->cpu_context.r19 = (unsigned long)arg; | |
71 | childregs->pt_mode = 1; | |
72 | local_save_flags(childregs->msr); | |
73 | #ifdef CONFIG_MMU | |
74 | ti->cpu_context.msr = childregs->msr & ~MSR_IE; | |
75 | #endif | |
76 | ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8; | |
77 | return 0; | |
78 | } | |
f3268edb AV |
79 | *childregs = *current_pt_regs(); |
80 | if (usp) | |
81 | childregs->r1 = usp; | |
6496a23a MS |
82 | |
83 | memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); | |
84 | ti->cpu_context.r1 = (unsigned long)childregs; | |
2319295d | 85 | #ifndef CONFIG_MMU |
6496a23a | 86 | ti->cpu_context.msr = (unsigned long)childregs->msr; |
5233806d | 87 | #else |
2319295d | 88 | childregs->msr |= MSR_UMS; |
5233806d | 89 | |
5233806d MS |
90 | /* we should consider the fact that childregs is a copy of the parent |
91 | * regs which were saved immediately after entering the kernel state | |
92 | * before enabling VM. This MSR will be restored in switch_to and | |
93 | * RETURN() and we want to have the right machine state there | |
94 | * specifically this state must have INTs disabled before and enabled | |
95 | * after performing rtbd | |
96 | * compose the right MSR for RETURN(). It will work for switch_to also | |
97 | * excepting for VM and UMS | |
98 | * don't touch UMS , CARRY and cache bits | |
99 | * right now MSR is a copy of parent one */ | |
5233806d MS |
100 | childregs->msr &= ~MSR_EIP; |
101 | childregs->msr |= MSR_IE; | |
102 | childregs->msr &= ~MSR_VM; | |
103 | childregs->msr |= MSR_VMS; | |
104 | childregs->msr |= MSR_EE; /* exceptions will be enabled*/ | |
105 | ||
106 | ti->cpu_context.msr = (childregs->msr|MSR_VM); | |
107 | ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */ | |
84ac218f | 108 | ti->cpu_context.msr &= ~MSR_IE; |
5233806d | 109 | #endif |
6496a23a MS |
110 | ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8; |
111 | ||
d5c15f17 EI |
112 | /* |
113 | * r21 is the thread reg, r10 is 6th arg to clone | |
114 | * which contains TLS area | |
115 | */ | |
6496a23a | 116 | if (clone_flags & CLONE_SETTLS) |
d5c15f17 | 117 | childregs->r21 = childregs->r10; |
6496a23a MS |
118 | |
119 | return 0; | |
120 | } | |
121 | ||
5233806d | 122 | #ifndef CONFIG_MMU |
6496a23a MS |
123 | /* |
124 | * Return saved PC of a blocked thread. | |
125 | */ | |
126 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
127 | { | |
128 | struct cpu_context *ctx = | |
129 | &(((struct thread_info *)(tsk->stack))->cpu_context); | |
130 | ||
131 | /* Check whether the thread is blocked in resume() */ | |
132 | if (in_sched_functions(ctx->r15)) | |
133 | return (unsigned long)ctx->r15; | |
134 | else | |
135 | return ctx->r14; | |
136 | } | |
5233806d | 137 | #endif |
6496a23a | 138 | |
6496a23a MS |
139 | unsigned long get_wchan(struct task_struct *p) |
140 | { | |
141 | /* TBD (used by procfs) */ | |
142 | return 0; | |
143 | } | |
e1c4bd08 MS |
144 | |
145 | /* Set up a thread for executing a new program */ | |
146 | void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp) | |
147 | { | |
e1c4bd08 MS |
148 | regs->pc = pc; |
149 | regs->r1 = usp; | |
150 | regs->pt_mode = 0; | |
f1ae3f69 | 151 | #ifdef CONFIG_MMU |
866d7229 | 152 | regs->msr |= MSR_UMS; |
99c59f60 | 153 | regs->msr &= ~MSR_VM; |
f1ae3f69 | 154 | #endif |
e1c4bd08 | 155 | } |
5233806d MS |
156 | |
157 | #ifdef CONFIG_MMU | |
158 | #include <linux/elfcore.h> | |
159 | /* | |
160 | * Set up a thread for executing a new program | |
161 | */ | |
162 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs) | |
163 | { | |
164 | return 0; /* MicroBlaze has no separate FPU registers */ | |
165 | } | |
166 | #endif /* CONFIG_MMU */ | |
a047775e MS |
167 | |
168 | void arch_cpu_idle(void) | |
169 | { | |
170 | local_irq_enable(); | |
171 | } |