aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86_64/kernel/setup64.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86_64/kernel/setup64.c')
-rw-r--r--arch/x86_64/kernel/setup64.c289
1 files changed, 0 insertions, 289 deletions
diff --git a/arch/x86_64/kernel/setup64.c b/arch/x86_64/kernel/setup64.c
deleted file mode 100644
index 1200aaac403e..000000000000
--- a/arch/x86_64/kernel/setup64.c
+++ /dev/null
@@ -1,289 +0,0 @@
1/*
2 * X86-64 specific CPU setup.
3 * Copyright (C) 1995 Linus Torvalds
4 * Copyright 2001, 2002, 2003 SuSE Labs / Andi Kleen.
5 * See setup.c for older changelog.
6 */
7#include <linux/init.h>
8#include <linux/kernel.h>
9#include <linux/sched.h>
10#include <linux/string.h>
11#include <linux/bootmem.h>
12#include <linux/bitops.h>
13#include <linux/module.h>
14#include <asm/bootsetup.h>
15#include <asm/pda.h>
16#include <asm/pgtable.h>
17#include <asm/processor.h>
18#include <asm/desc.h>
19#include <asm/atomic.h>
20#include <asm/mmu_context.h>
21#include <asm/smp.h>
22#include <asm/i387.h>
23#include <asm/percpu.h>
24#include <asm/proto.h>
25#include <asm/sections.h>
26
27char x86_boot_params[BOOT_PARAM_SIZE] __initdata;
28
29cpumask_t cpu_initialized __cpuinitdata = CPU_MASK_NONE;
30
31struct x8664_pda *_cpu_pda[NR_CPUS] __read_mostly;
32EXPORT_SYMBOL(_cpu_pda);
33struct x8664_pda boot_cpu_pda[NR_CPUS] __cacheline_aligned;
34
35struct desc_ptr idt_descr = { 256 * 16 - 1, (unsigned long) idt_table };
36
37char boot_cpu_stack[IRQSTACKSIZE] __attribute__((section(".bss.page_aligned")));
38
39unsigned long __supported_pte_mask __read_mostly = ~0UL;
40static int do_not_nx __cpuinitdata = 0;
41
42/* noexec=on|off
43Control non executable mappings for 64bit processes.
44
45on Enable(default)
46off Disable
47*/
48static int __init nonx_setup(char *str)
49{
50 if (!str)
51 return -EINVAL;
52 if (!strncmp(str, "on", 2)) {
53 __supported_pte_mask |= _PAGE_NX;
54 do_not_nx = 0;
55 } else if (!strncmp(str, "off", 3)) {
56 do_not_nx = 1;
57 __supported_pte_mask &= ~_PAGE_NX;
58 }
59 return 0;
60}
61early_param("noexec", nonx_setup);
62
63int force_personality32 = 0;
64
65/* noexec32=on|off
66Control non executable heap for 32bit processes.
67To control the stack too use noexec=off
68
69on PROT_READ does not imply PROT_EXEC for 32bit processes
70off PROT_READ implies PROT_EXEC (default)
71*/
72static int __init nonx32_setup(char *str)
73{
74 if (!strcmp(str, "on"))
75 force_personality32 &= ~READ_IMPLIES_EXEC;
76 else if (!strcmp(str, "off"))
77 force_personality32 |= READ_IMPLIES_EXEC;
78 return 1;
79}
80__setup("noexec32=", nonx32_setup);
81
82/*
83 * Great future plan:
84 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
85 * Always point %gs to its beginning
86 */
87void __init setup_per_cpu_areas(void)
88{
89 int i;
90 unsigned long size;
91
92#ifdef CONFIG_HOTPLUG_CPU
93 prefill_possible_map();
94#endif
95
96 /* Copy section for each CPU (we discard the original) */
97 size = PERCPU_ENOUGH_ROOM;
98
99 printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n", size);
100 for_each_cpu_mask (i, cpu_possible_map) {
101 char *ptr;
102
103 if (!NODE_DATA(cpu_to_node(i))) {
104 printk("cpu with no node %d, num_online_nodes %d\n",
105 i, num_online_nodes());
106 ptr = alloc_bootmem_pages(size);
107 } else {
108 ptr = alloc_bootmem_pages_node(NODE_DATA(cpu_to_node(i)), size);
109 }
110 if (!ptr)
111 panic("Cannot allocate cpu data for CPU %d\n", i);
112 cpu_pda(i)->data_offset = ptr - __per_cpu_start;
113 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
114 }
115}
116
117void pda_init(int cpu)
118{
119 struct x8664_pda *pda = cpu_pda(cpu);
120
121 /* Setup up data that may be needed in __get_free_pages early */
122 asm volatile("movl %0,%%fs ; movl %0,%%gs" :: "r" (0));
123 /* Memory clobbers used to order PDA accessed */
124 mb();
125 wrmsrl(MSR_GS_BASE, pda);
126 mb();
127
128 pda->cpunumber = cpu;
129 pda->irqcount = -1;
130 pda->kernelstack =
131 (unsigned long)stack_thread_info() - PDA_STACKOFFSET + THREAD_SIZE;
132 pda->active_mm = &init_mm;
133 pda->mmu_state = 0;
134
135 if (cpu == 0) {
136 /* others are initialized in smpboot.c */
137 pda->pcurrent = &init_task;
138 pda->irqstackptr = boot_cpu_stack;
139 } else {
140 pda->irqstackptr = (char *)
141 __get_free_pages(GFP_ATOMIC, IRQSTACK_ORDER);
142 if (!pda->irqstackptr)
143 panic("cannot allocate irqstack for cpu %d", cpu);
144 }
145
146
147 pda->irqstackptr += IRQSTACKSIZE-64;
148}
149
150char boot_exception_stacks[(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ + DEBUG_STKSZ]
151__attribute__((section(".bss.page_aligned")));
152
153extern asmlinkage void ignore_sysret(void);
154
155/* May not be marked __init: used by software suspend */
156void syscall_init(void)
157{
158 /*
159 * LSTAR and STAR live in a bit strange symbiosis.
160 * They both write to the same internal register. STAR allows to set CS/DS
161 * but only a 32bit target. LSTAR sets the 64bit rip.
162 */
163 wrmsrl(MSR_STAR, ((u64)__USER32_CS)<<48 | ((u64)__KERNEL_CS)<<32);
164 wrmsrl(MSR_LSTAR, system_call);
165 wrmsrl(MSR_CSTAR, ignore_sysret);
166
167#ifdef CONFIG_IA32_EMULATION
168 syscall32_cpu_init ();
169#endif
170
171 /* Flags to clear on syscall */
172 wrmsrl(MSR_SYSCALL_MASK, EF_TF|EF_DF|EF_IE|0x3000);
173}
174
175void __cpuinit check_efer(void)
176{
177 unsigned long efer;
178
179 rdmsrl(MSR_EFER, efer);
180 if (!(efer & EFER_NX) || do_not_nx) {
181 __supported_pte_mask &= ~_PAGE_NX;
182 }
183}
184
185unsigned long kernel_eflags;
186
187/*
188 * cpu_init() initializes state that is per-CPU. Some data is already
189 * initialized (naturally) in the bootstrap process, such as the GDT
190 * and IDT. We reload them nevertheless, this function acts as a
191 * 'CPU state barrier', nothing should get across.
192 * A lot of state is already set up in PDA init.
193 */
194void __cpuinit cpu_init (void)
195{
196 int cpu = stack_smp_processor_id();
197 struct tss_struct *t = &per_cpu(init_tss, cpu);
198 struct orig_ist *orig_ist = &per_cpu(orig_ist, cpu);
199 unsigned long v;
200 char *estacks = NULL;
201 struct task_struct *me;
202 int i;
203
204 /* CPU 0 is initialised in head64.c */
205 if (cpu != 0) {
206 pda_init(cpu);
207 } else
208 estacks = boot_exception_stacks;
209
210 me = current;
211
212 if (cpu_test_and_set(cpu, cpu_initialized))
213 panic("CPU#%d already initialized!\n", cpu);
214
215 printk("Initializing CPU#%d\n", cpu);
216
217 clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE);
218
219 /*
220 * Initialize the per-CPU GDT with the boot GDT,
221 * and set up the GDT descriptor:
222 */
223 if (cpu)
224 memcpy(cpu_gdt(cpu), cpu_gdt_table, GDT_SIZE);
225
226 cpu_gdt_descr[cpu].size = GDT_SIZE;
227 asm volatile("lgdt %0" :: "m" (cpu_gdt_descr[cpu]));
228 asm volatile("lidt %0" :: "m" (idt_descr));
229
230 memset(me->thread.tls_array, 0, GDT_ENTRY_TLS_ENTRIES * 8);
231 syscall_init();
232
233 wrmsrl(MSR_FS_BASE, 0);
234 wrmsrl(MSR_KERNEL_GS_BASE, 0);
235 barrier();
236
237 check_efer();
238
239 /*
240 * set up and load the per-CPU TSS
241 */
242 for (v = 0; v < N_EXCEPTION_STACKS; v++) {
243 static const unsigned int order[N_EXCEPTION_STACKS] = {
244 [0 ... N_EXCEPTION_STACKS - 1] = EXCEPTION_STACK_ORDER,
245 [DEBUG_STACK - 1] = DEBUG_STACK_ORDER
246 };
247 if (cpu) {
248 estacks = (char *)__get_free_pages(GFP_ATOMIC, order[v]);
249 if (!estacks)
250 panic("Cannot allocate exception stack %ld %d\n",
251 v, cpu);
252 }
253 estacks += PAGE_SIZE << order[v];
254 orig_ist->ist[v] = t->ist[v] = (unsigned long)estacks;
255 }
256
257 t->io_bitmap_base = offsetof(struct tss_struct, io_bitmap);
258 /*
259 * <= is required because the CPU will access up to
260 * 8 bits beyond the end of the IO permission bitmap.
261 */
262 for (i = 0; i <= IO_BITMAP_LONGS; i++)
263 t->io_bitmap[i] = ~0UL;
264
265 atomic_inc(&init_mm.mm_count);
266 me->active_mm = &init_mm;
267 if (me->mm)
268 BUG();
269 enter_lazy_tlb(&init_mm, me);
270
271 set_tss_desc(cpu, t);
272 load_TR_desc();
273 load_LDT(&init_mm.context);
274
275 /*
276 * Clear all 6 debug registers:
277 */
278
279 set_debugreg(0UL, 0);
280 set_debugreg(0UL, 1);
281 set_debugreg(0UL, 2);
282 set_debugreg(0UL, 3);
283 set_debugreg(0UL, 6);
284 set_debugreg(0UL, 7);
285
286 fpu_init();
287
288 raw_local_save_flags(kernel_eflags);
289}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 00:41:11 -0500