1 /* Paravirtualization interfaces
2 Copyright (C) 2006 Rusty Russell IBM Corporation
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 2007 - x86_64 support added by Glauber de Oliveira Costa, Red Hat Inc
21 #include <linux/errno.h>
22 #include <linux/module.h>
23 #include <linux/efi.h>
24 #include <linux/bcd.h>
25 #include <linux/highmem.h>
28 #include <asm/paravirt.h>
30 #include <asm/setup.h>
31 #include <asm/arch_hooks.h>
33 #include <asm/pgalloc.h>
35 #include <asm/delay.h>
36 #include <asm/fixmap.h>
38 #include <asm/tlbflush.h>
39 #include <asm/timer.h>
42 void _paravirt_nop(void)
46 static void __init
default_banner(void)
48 printk(KERN_INFO
"Booting paravirtualized kernel on %s\n",
52 char *memory_setup(void)
54 return pv_init_ops
.memory_setup();
57 /* Simple instruction patching code. */
58 #define DEF_NATIVE(ops, name, code) \
59 extern const char start_##ops##_##name[], end_##ops##_##name[]; \
60 asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
62 /* Undefined instruction for dealing with missing ops pointers. */
63 static const unsigned char ud2a
[] = { 0x0f, 0x0b };
65 unsigned paravirt_patch_nop(void)
70 unsigned paravirt_patch_ignore(unsigned len
)
78 } __attribute__((packed
));
80 unsigned paravirt_patch_call(void *insnbuf
,
81 const void *target
, u16 tgt_clobbers
,
82 unsigned long addr
, u16 site_clobbers
,
85 struct branch
*b
= insnbuf
;
86 unsigned long delta
= (unsigned long)target
- (addr
+5);
88 if (tgt_clobbers
& ~site_clobbers
)
89 return len
; /* target would clobber too much for this site */
91 return len
; /* call too long for patch site */
93 b
->opcode
= 0xe8; /* call */
95 BUILD_BUG_ON(sizeof(*b
) != 5);
100 unsigned paravirt_patch_jmp(void *insnbuf
, const void *target
,
101 unsigned long addr
, unsigned len
)
103 struct branch
*b
= insnbuf
;
104 unsigned long delta
= (unsigned long)target
- (addr
+5);
107 return len
; /* call too long for patch site */
109 b
->opcode
= 0xe9; /* jmp */
115 /* Neat trick to map patch type back to the call within the
116 * corresponding structure. */
117 static void *get_call_destination(u8 type
)
119 struct paravirt_patch_template tmpl
= {
120 .pv_init_ops
= pv_init_ops
,
121 .pv_time_ops
= pv_time_ops
,
122 .pv_cpu_ops
= pv_cpu_ops
,
123 .pv_irq_ops
= pv_irq_ops
,
124 .pv_apic_ops
= pv_apic_ops
,
125 .pv_mmu_ops
= pv_mmu_ops
,
127 return *((void **)&tmpl
+ type
);
130 unsigned paravirt_patch_default(u8 type
, u16 clobbers
, void *insnbuf
,
131 unsigned long addr
, unsigned len
)
133 void *opfunc
= get_call_destination(type
);
137 /* If there's no function, patch it with a ud2a (BUG) */
138 ret
= paravirt_patch_insns(insnbuf
, len
, ud2a
, ud2a
+sizeof(ud2a
));
139 else if (opfunc
== paravirt_nop
)
140 /* If the operation is a nop, then nop the callsite */
141 ret
= paravirt_patch_nop();
142 else if (type
== PARAVIRT_PATCH(pv_cpu_ops
.iret
) ||
143 type
== PARAVIRT_PATCH(pv_cpu_ops
.irq_enable_sysexit
) ||
144 type
== PARAVIRT_PATCH(pv_cpu_ops
.usergs_sysret32
) ||
145 type
== PARAVIRT_PATCH(pv_cpu_ops
.usergs_sysret64
))
146 /* If operation requires a jmp, then jmp */
147 ret
= paravirt_patch_jmp(insnbuf
, opfunc
, addr
, len
);
149 /* Otherwise call the function; assume target could
150 clobber any caller-save reg */
151 ret
= paravirt_patch_call(insnbuf
, opfunc
, CLBR_ANY
,
152 addr
, clobbers
, len
);
157 unsigned paravirt_patch_insns(void *insnbuf
, unsigned len
,
158 const char *start
, const char *end
)
160 unsigned insn_len
= end
- start
;
162 if (insn_len
> len
|| start
== NULL
)
165 memcpy(insnbuf
, start
, insn_len
);
172 pv_irq_ops
.init_IRQ();
175 static void native_flush_tlb(void)
177 __native_flush_tlb();
181 * Global pages have to be flushed a bit differently. Not a real
182 * performance problem because this does not happen often.
184 static void native_flush_tlb_global(void)
186 __native_flush_tlb_global();
189 static void native_flush_tlb_single(unsigned long addr
)
191 __native_flush_tlb_single(addr
);
194 /* These are in entry.S */
195 extern void native_iret(void);
196 extern void native_irq_enable_sysexit(void);
197 extern void native_usergs_sysret32(void);
198 extern void native_usergs_sysret64(void);
200 static int __init
print_banner(void)
202 pv_init_ops
.banner();
205 core_initcall(print_banner
);
207 static struct resource reserve_ioports
= {
209 .end
= IO_SPACE_LIMIT
,
210 .name
= "paravirt-ioport",
211 .flags
= IORESOURCE_IO
| IORESOURCE_BUSY
,
215 * Reserve the whole legacy IO space to prevent any legacy drivers
216 * from wasting time probing for their hardware. This is a fairly
217 * brute-force approach to disabling all non-virtual drivers.
219 * Note that this must be called very early to have any effect.
221 int paravirt_disable_iospace(void)
223 return request_resource(&ioport_resource
, &reserve_ioports
);
226 static DEFINE_PER_CPU(enum paravirt_lazy_mode
, paravirt_lazy_mode
) = PARAVIRT_LAZY_NONE
;
228 static inline void enter_lazy(enum paravirt_lazy_mode mode
)
230 BUG_ON(__get_cpu_var(paravirt_lazy_mode
) != PARAVIRT_LAZY_NONE
);
231 BUG_ON(preemptible());
233 __get_cpu_var(paravirt_lazy_mode
) = mode
;
236 void paravirt_leave_lazy(enum paravirt_lazy_mode mode
)
238 BUG_ON(__get_cpu_var(paravirt_lazy_mode
) != mode
);
239 BUG_ON(preemptible());
241 __get_cpu_var(paravirt_lazy_mode
) = PARAVIRT_LAZY_NONE
;
244 void paravirt_enter_lazy_mmu(void)
246 enter_lazy(PARAVIRT_LAZY_MMU
);
249 void paravirt_leave_lazy_mmu(void)
251 paravirt_leave_lazy(PARAVIRT_LAZY_MMU
);
254 void paravirt_enter_lazy_cpu(void)
256 enter_lazy(PARAVIRT_LAZY_CPU
);
259 void paravirt_leave_lazy_cpu(void)
261 paravirt_leave_lazy(PARAVIRT_LAZY_CPU
);
264 enum paravirt_lazy_mode
paravirt_get_lazy_mode(void)
266 return __get_cpu_var(paravirt_lazy_mode
);
269 struct pv_info pv_info
= {
270 .name
= "bare hardware",
271 .paravirt_enabled
= 0,
273 .shared_kernel_pmd
= 1, /* Only used when CONFIG_X86_PAE is set */
276 struct pv_init_ops pv_init_ops
= {
277 .patch
= native_patch
,
278 .banner
= default_banner
,
279 .arch_setup
= paravirt_nop
,
280 .memory_setup
= machine_specific_memory_setup
,
283 struct pv_time_ops pv_time_ops
= {
284 .time_init
= hpet_time_init
,
285 .get_wallclock
= native_get_wallclock
,
286 .set_wallclock
= native_set_wallclock
,
287 .sched_clock
= native_sched_clock
,
288 .get_tsc_khz
= native_calibrate_tsc
,
291 struct pv_irq_ops pv_irq_ops
= {
292 .init_IRQ
= native_init_IRQ
,
293 .save_fl
= native_save_fl
,
294 .restore_fl
= native_restore_fl
,
295 .irq_disable
= native_irq_disable
,
296 .irq_enable
= native_irq_enable
,
297 .safe_halt
= native_safe_halt
,
300 .adjust_exception_frame
= paravirt_nop
,
304 struct pv_cpu_ops pv_cpu_ops
= {
305 .cpuid
= native_cpuid
,
306 .get_debugreg
= native_get_debugreg
,
307 .set_debugreg
= native_set_debugreg
,
309 .read_cr0
= native_read_cr0
,
310 .write_cr0
= native_write_cr0
,
311 .read_cr4
= native_read_cr4
,
312 .read_cr4_safe
= native_read_cr4_safe
,
313 .write_cr4
= native_write_cr4
,
315 .read_cr8
= native_read_cr8
,
316 .write_cr8
= native_write_cr8
,
318 .wbinvd
= native_wbinvd
,
319 .read_msr
= native_read_msr_safe
,
320 .write_msr
= native_write_msr_safe
,
321 .read_tsc
= native_read_tsc
,
322 .read_pmc
= native_read_pmc
,
323 .read_tscp
= native_read_tscp
,
324 .load_tr_desc
= native_load_tr_desc
,
325 .set_ldt
= native_set_ldt
,
326 .load_gdt
= native_load_gdt
,
327 .load_idt
= native_load_idt
,
328 .store_gdt
= native_store_gdt
,
329 .store_idt
= native_store_idt
,
330 .store_tr
= native_store_tr
,
331 .load_tls
= native_load_tls
,
333 .load_gs_index
= native_load_gs_index
,
335 .write_ldt_entry
= native_write_ldt_entry
,
336 .write_gdt_entry
= native_write_gdt_entry
,
337 .write_idt_entry
= native_write_idt_entry
,
338 .load_sp0
= native_load_sp0
,
340 #if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
341 .irq_enable_sysexit
= native_irq_enable_sysexit
,
344 #ifdef CONFIG_IA32_EMULATION
345 .usergs_sysret32
= native_usergs_sysret32
,
347 .usergs_sysret64
= native_usergs_sysret64
,
350 .swapgs
= native_swapgs
,
352 .set_iopl_mask
= native_set_iopl_mask
,
353 .io_delay
= native_io_delay
,
356 .enter
= paravirt_nop
,
357 .leave
= paravirt_nop
,
361 struct pv_apic_ops pv_apic_ops
= {
362 #ifdef CONFIG_X86_LOCAL_APIC
363 .apic_write
= native_apic_write
,
364 .apic_write_atomic
= native_apic_write_atomic
,
365 .apic_read
= native_apic_read
,
366 .setup_boot_clock
= setup_boot_APIC_clock
,
367 .setup_secondary_clock
= setup_secondary_APIC_clock
,
368 .startup_ipi_hook
= paravirt_nop
,
372 struct pv_mmu_ops pv_mmu_ops
= {
373 #ifndef CONFIG_X86_64
374 .pagetable_setup_start
= native_pagetable_setup_start
,
375 .pagetable_setup_done
= native_pagetable_setup_done
,
378 .read_cr2
= native_read_cr2
,
379 .write_cr2
= native_write_cr2
,
380 .read_cr3
= native_read_cr3
,
381 .write_cr3
= native_write_cr3
,
383 .flush_tlb_user
= native_flush_tlb
,
384 .flush_tlb_kernel
= native_flush_tlb_global
,
385 .flush_tlb_single
= native_flush_tlb_single
,
386 .flush_tlb_others
= native_flush_tlb_others
,
388 .pgd_alloc
= __paravirt_pgd_alloc
,
389 .pgd_free
= paravirt_nop
,
391 .alloc_pte
= paravirt_nop
,
392 .alloc_pmd
= paravirt_nop
,
393 .alloc_pmd_clone
= paravirt_nop
,
394 .alloc_pud
= paravirt_nop
,
395 .release_pte
= paravirt_nop
,
396 .release_pmd
= paravirt_nop
,
397 .release_pud
= paravirt_nop
,
399 .set_pte
= native_set_pte
,
400 .set_pte_at
= native_set_pte_at
,
401 .set_pmd
= native_set_pmd
,
402 .pte_update
= paravirt_nop
,
403 .pte_update_defer
= paravirt_nop
,
405 .ptep_modify_prot_start
= __ptep_modify_prot_start
,
406 .ptep_modify_prot_commit
= __ptep_modify_prot_commit
,
408 #ifdef CONFIG_HIGHPTE
409 .kmap_atomic_pte
= kmap_atomic
,
412 #if PAGETABLE_LEVELS >= 3
413 #ifdef CONFIG_X86_PAE
414 .set_pte_atomic
= native_set_pte_atomic
,
415 .set_pte_present
= native_set_pte_present
,
416 .pte_clear
= native_pte_clear
,
417 .pmd_clear
= native_pmd_clear
,
419 .set_pud
= native_set_pud
,
420 .pmd_val
= native_pmd_val
,
421 .make_pmd
= native_make_pmd
,
423 #if PAGETABLE_LEVELS == 4
424 .pud_val
= native_pud_val
,
425 .make_pud
= native_make_pud
,
426 .set_pgd
= native_set_pgd
,
428 #endif /* PAGETABLE_LEVELS >= 3 */
430 .pte_val
= native_pte_val
,
431 .pte_flags
= native_pte_val
,
432 .pgd_val
= native_pgd_val
,
434 .make_pte
= native_make_pte
,
435 .make_pgd
= native_make_pgd
,
437 .dup_mmap
= paravirt_nop
,
438 .exit_mmap
= paravirt_nop
,
439 .activate_mm
= paravirt_nop
,
442 .enter
= paravirt_nop
,
443 .leave
= paravirt_nop
,
446 .set_fixmap
= native_set_fixmap
,
449 EXPORT_SYMBOL_GPL(pv_time_ops
);
450 EXPORT_SYMBOL (pv_cpu_ops
);
451 EXPORT_SYMBOL (pv_mmu_ops
);
452 EXPORT_SYMBOL_GPL(pv_apic_ops
);
453 EXPORT_SYMBOL_GPL(pv_info
);
454 EXPORT_SYMBOL (pv_irq_ops
);