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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/x86_64/kernel/setup64.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/x86_64/kernel/setup64.c')
-rw-r--r--arch/x86_64/kernel/setup64.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/setup64.c b/arch/x86_64/kernel/setup64.c
new file mode 100644
index 000000000000..b5305b04bc40
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+++ b/arch/x86_64/kernel/setup64.c
@@ -0,0 +1,292 @@
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 * $Id: setup64.c,v 1.12 2002/03/21 10:09:17 ak Exp $
7 */
8#include <linux/config.h>
9#include <linux/init.h>
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <linux/string.h>
13#include <linux/bootmem.h>
14#include <linux/bitops.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/mtrr.h>
25#include <asm/proto.h>
26#include <asm/mman.h>
27#include <asm/numa.h>
28
29char x86_boot_params[2048] __initdata = {0,};
30
31cpumask_t cpu_initialized __initdata = CPU_MASK_NONE;
32
33struct x8664_pda cpu_pda[NR_CPUS] __cacheline_aligned;
34
35extern struct task_struct init_task;
36
37extern unsigned char __per_cpu_start[], __per_cpu_end[];
38
39extern struct desc_ptr cpu_gdt_descr[];
40struct desc_ptr idt_descr = { 256 * 16, (unsigned long) idt_table };
41
42char boot_cpu_stack[IRQSTACKSIZE] __attribute__((section(".bss.page_aligned")));
43
44unsigned long __supported_pte_mask = ~0UL;
45static int do_not_nx __initdata = 0;
46
47/* noexec=on|off
48Control non executable mappings for 64bit processes.
49
50on Enable(default)
51off Disable
52*/
53int __init nonx_setup(char *str)
54{
55 if (!strncmp(str, "on", 2)) {
56 __supported_pte_mask |= _PAGE_NX;
57 do_not_nx = 0;
58 } else if (!strncmp(str, "off", 3)) {
59 do_not_nx = 1;
60 __supported_pte_mask &= ~_PAGE_NX;
61 }
62 return 0;
63}
64__setup("noexec=", nonx_setup); /* parsed early actually */
65
66int force_personality32 = READ_IMPLIES_EXEC;
67
68/* noexec32=on|off
69Control non executable heap for 32bit processes.
70To control the stack too use noexec=off
71
72on PROT_READ does not imply PROT_EXEC for 32bit processes
73off PROT_READ implies PROT_EXEC (default)
74*/
75static int __init nonx32_setup(char *str)
76{
77 if (!strcmp(str, "on"))
78 force_personality32 &= ~READ_IMPLIES_EXEC;
79 else if (!strcmp(str, "off"))
80 force_personality32 |= READ_IMPLIES_EXEC;
81 return 0;
82}
83__setup("noexec32=", nonx32_setup);
84
85/*
86 * Great future plan:
87 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
88 * Always point %gs to its beginning
89 */
90void __init setup_per_cpu_areas(void)
91{
92 int i;
93 unsigned long size;
94
95 /* Copy section for each CPU (we discard the original) */
96 size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES);
97#ifdef CONFIG_MODULES
98 if (size < PERCPU_ENOUGH_ROOM)
99 size = PERCPU_ENOUGH_ROOM;
100#endif
101
102 for (i = 0; i < NR_CPUS; i++) {
103 unsigned char *ptr;
104
105 if (!NODE_DATA(cpu_to_node(i))) {
106 printk("cpu with no node %d, num_online_nodes %d\n",
107 i, num_online_nodes());
108 ptr = alloc_bootmem(size);
109 } else {
110 ptr = alloc_bootmem_node(NODE_DATA(cpu_to_node(i)), size);
111 }
112 if (!ptr)
113 panic("Cannot allocate cpu data for CPU %d\n", i);
114 cpu_pda[i].data_offset = ptr - __per_cpu_start;
115 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
116 }
117}
118
119void pda_init(int cpu)
120{
121 struct x8664_pda *pda = &cpu_pda[cpu];
122
123 /* Setup up data that may be needed in __get_free_pages early */
124 asm volatile("movl %0,%%fs ; movl %0,%%gs" :: "r" (0));
125 wrmsrl(MSR_GS_BASE, cpu_pda + cpu);
126
127 pda->me = pda;
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 asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt)));
147
148 pda->irqstackptr += IRQSTACKSIZE-64;
149}
150
151char boot_exception_stacks[N_EXCEPTION_STACKS * EXCEPTION_STKSZ]
152__attribute__((section(".bss.page_aligned")));
153
154/* May not be marked __init: used by software suspend */
155void syscall_init(void)
156{
157 /*
158 * LSTAR and STAR live in a bit strange symbiosis.
159 * They both write to the same internal register. STAR allows to set CS/DS
160 * but only a 32bit target. LSTAR sets the 64bit rip.
161 */
162 wrmsrl(MSR_STAR, ((u64)__USER32_CS)<<48 | ((u64)__KERNEL_CS)<<32);
163 wrmsrl(MSR_LSTAR, system_call);
164
165#ifdef CONFIG_IA32_EMULATION
166 syscall32_cpu_init ();
167#endif
168
169 /* Flags to clear on syscall */
170 wrmsrl(MSR_SYSCALL_MASK, EF_TF|EF_DF|EF_IE|0x3000);
171}
172
173void __init check_efer(void)
174{
175 unsigned long efer;
176
177 rdmsrl(MSR_EFER, efer);
178 if (!(efer & EFER_NX) || do_not_nx) {
179 __supported_pte_mask &= ~_PAGE_NX;
180 }
181}
182
183/*
184 * cpu_init() initializes state that is per-CPU. Some data is already
185 * initialized (naturally) in the bootstrap process, such as the GDT
186 * and IDT. We reload them nevertheless, this function acts as a
187 * 'CPU state barrier', nothing should get across.
188 * A lot of state is already set up in PDA init.
189 */
190void __init cpu_init (void)
191{
192#ifdef CONFIG_SMP
193 int cpu = stack_smp_processor_id();
194#else
195 int cpu = smp_processor_id();
196#endif
197 struct tss_struct *t = &per_cpu(init_tss, cpu);
198 unsigned long v;
199 char *estacks = NULL;
200 struct task_struct *me;
201 int i;
202
203 /* CPU 0 is initialised in head64.c */
204 if (cpu != 0) {
205 pda_init(cpu);
206 } else
207 estacks = boot_exception_stacks;
208
209 me = current;
210
211 if (cpu_test_and_set(cpu, cpu_initialized))
212 panic("CPU#%d already initialized!\n", cpu);
213
214 printk("Initializing CPU#%d\n", cpu);
215
216 clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE);
217
218 /*
219 * Initialize the per-CPU GDT with the boot GDT,
220 * and set up the GDT descriptor:
221 */
222 if (cpu) {
223 memcpy(cpu_gdt_table[cpu], cpu_gdt_table[0], GDT_SIZE);
224 }
225
226 cpu_gdt_descr[cpu].size = GDT_SIZE;
227 cpu_gdt_descr[cpu].address = (unsigned long)cpu_gdt_table[cpu];
228 asm volatile("lgdt %0" :: "m" (cpu_gdt_descr[cpu]));
229 asm volatile("lidt %0" :: "m" (idt_descr));
230
231 memcpy(me->thread.tls_array, cpu_gdt_table[cpu], GDT_ENTRY_TLS_ENTRIES * 8);
232
233 /*
234 * Delete NT
235 */
236
237 asm volatile("pushfq ; popq %%rax ; btr $14,%%rax ; pushq %%rax ; popfq" ::: "eax");
238
239 syscall_init();
240
241 wrmsrl(MSR_FS_BASE, 0);
242 wrmsrl(MSR_KERNEL_GS_BASE, 0);
243 barrier();
244
245 check_efer();
246
247 /*
248 * set up and load the per-CPU TSS
249 */
250 for (v = 0; v < N_EXCEPTION_STACKS; v++) {
251 if (cpu) {
252 estacks = (char *)__get_free_pages(GFP_ATOMIC,
253 EXCEPTION_STACK_ORDER);
254 if (!estacks)
255 panic("Cannot allocate exception stack %ld %d\n",
256 v, cpu);
257 }
258 estacks += EXCEPTION_STKSZ;
259 t->ist[v] = (unsigned long)estacks;
260 }
261
262 t->io_bitmap_base = offsetof(struct tss_struct, io_bitmap);
263 /*
264 * <= is required because the CPU will access up to
265 * 8 bits beyond the end of the IO permission bitmap.
266 */
267 for (i = 0; i <= IO_BITMAP_LONGS; i++)
268 t->io_bitmap[i] = ~0UL;
269
270 atomic_inc(&init_mm.mm_count);
271 me->active_mm = &init_mm;
272 if (me->mm)
273 BUG();
274 enter_lazy_tlb(&init_mm, me);
275
276 set_tss_desc(cpu, t);
277 load_TR_desc();
278 load_LDT(&init_mm.context);
279
280 /*
281 * Clear all 6 debug registers:
282 */
283
284 set_debug(0UL, 0);
285 set_debug(0UL, 1);
286 set_debug(0UL, 2);
287 set_debug(0UL, 3);
288 set_debug(0UL, 6);
289 set_debug(0UL, 7);
290
291 fpu_init();
292}