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
.usersp_sysret
))
145 /* If operation requires a jmp, then jmp */
146 ret
= paravirt_patch_jmp(insnbuf
, opfunc
, addr
, len
);
148 /* Otherwise call the function; assume target could
149 clobber any caller-save reg */
150 ret
= paravirt_patch_call(insnbuf
, opfunc
, CLBR_ANY
,
151 addr
, clobbers
, len
);
156 unsigned paravirt_patch_insns(void *insnbuf
, unsigned len
,
157 const char *start
, const char *end
)
159 unsigned insn_len
= end
- start
;
161 if (insn_len
> len
|| start
== NULL
)
164 memcpy(insnbuf
, start
, insn_len
);
171 pv_irq_ops
.init_IRQ();
174 static void native_flush_tlb(void)
176 __native_flush_tlb();
180 * Global pages have to be flushed a bit differently. Not a real
181 * performance problem because this does not happen often.
183 static void native_flush_tlb_global(void)
185 __native_flush_tlb_global();
188 static void native_flush_tlb_single(unsigned long addr
)
190 __native_flush_tlb_single(addr
);
193 /* These are in entry.S */
194 extern void native_iret(void);
195 extern void native_irq_enable_sysexit(void);
196 extern void native_usersp_sysret(void);
198 static int __init
print_banner(void)
200 pv_init_ops
.banner();
203 core_initcall(print_banner
);
205 static struct resource reserve_ioports
= {
207 .end
= IO_SPACE_LIMIT
,
208 .name
= "paravirt-ioport",
209 .flags
= IORESOURCE_IO
| IORESOURCE_BUSY
,
213 * Reserve the whole legacy IO space to prevent any legacy drivers
214 * from wasting time probing for their hardware. This is a fairly
215 * brute-force approach to disabling all non-virtual drivers.
217 * Note that this must be called very early to have any effect.
219 int paravirt_disable_iospace(void)
221 return request_resource(&ioport_resource
, &reserve_ioports
);
224 static DEFINE_PER_CPU(enum paravirt_lazy_mode
, paravirt_lazy_mode
) = PARAVIRT_LAZY_NONE
;
226 static inline void enter_lazy(enum paravirt_lazy_mode mode
)
228 BUG_ON(__get_cpu_var(paravirt_lazy_mode
) != PARAVIRT_LAZY_NONE
);
229 BUG_ON(preemptible());
231 __get_cpu_var(paravirt_lazy_mode
) = mode
;
234 void paravirt_leave_lazy(enum paravirt_lazy_mode mode
)
236 BUG_ON(__get_cpu_var(paravirt_lazy_mode
) != mode
);
237 BUG_ON(preemptible());
239 __get_cpu_var(paravirt_lazy_mode
) = PARAVIRT_LAZY_NONE
;
242 void paravirt_enter_lazy_mmu(void)
244 enter_lazy(PARAVIRT_LAZY_MMU
);
247 void paravirt_leave_lazy_mmu(void)
249 paravirt_leave_lazy(PARAVIRT_LAZY_MMU
);
252 void paravirt_enter_lazy_cpu(void)
254 enter_lazy(PARAVIRT_LAZY_CPU
);
257 void paravirt_leave_lazy_cpu(void)
259 paravirt_leave_lazy(PARAVIRT_LAZY_CPU
);
262 enum paravirt_lazy_mode
paravirt_get_lazy_mode(void)
264 return __get_cpu_var(paravirt_lazy_mode
);
267 struct pv_info pv_info
= {
268 .name
= "bare hardware",
269 .paravirt_enabled
= 0,
271 .shared_kernel_pmd
= 1, /* Only used when CONFIG_X86_PAE is set */
274 struct pv_init_ops pv_init_ops
= {
275 .patch
= native_patch
,
276 .banner
= default_banner
,
277 .arch_setup
= paravirt_nop
,
278 .memory_setup
= machine_specific_memory_setup
,
281 struct pv_time_ops pv_time_ops
= {
282 .time_init
= hpet_time_init
,
283 .get_wallclock
= native_get_wallclock
,
284 .set_wallclock
= native_set_wallclock
,
285 .sched_clock
= native_sched_clock
,
286 .get_cpu_khz
= native_calculate_cpu_khz
,
289 struct pv_irq_ops pv_irq_ops
= {
290 .init_IRQ
= native_init_IRQ
,
291 .save_fl
= native_save_fl
,
292 .restore_fl
= native_restore_fl
,
293 .irq_disable
= native_irq_disable
,
294 .irq_enable
= native_irq_enable
,
295 .safe_halt
= native_safe_halt
,
299 struct pv_cpu_ops pv_cpu_ops
= {
300 .cpuid
= native_cpuid
,
301 .get_debugreg
= native_get_debugreg
,
302 .set_debugreg
= native_set_debugreg
,
304 .read_cr0
= native_read_cr0
,
305 .write_cr0
= native_write_cr0
,
306 .read_cr4
= native_read_cr4
,
307 .read_cr4_safe
= native_read_cr4_safe
,
308 .write_cr4
= native_write_cr4
,
310 .read_cr8
= native_read_cr8
,
311 .write_cr8
= native_write_cr8
,
313 .wbinvd
= native_wbinvd
,
314 .read_msr
= native_read_msr_safe
,
315 .write_msr
= native_write_msr_safe
,
316 .read_tsc
= native_read_tsc
,
317 .read_pmc
= native_read_pmc
,
318 .read_tscp
= native_read_tscp
,
319 .load_tr_desc
= native_load_tr_desc
,
320 .set_ldt
= native_set_ldt
,
321 .load_gdt
= native_load_gdt
,
322 .load_idt
= native_load_idt
,
323 .store_gdt
= native_store_gdt
,
324 .store_idt
= native_store_idt
,
325 .store_tr
= native_store_tr
,
326 .load_tls
= native_load_tls
,
327 .write_ldt_entry
= native_write_ldt_entry
,
328 .write_gdt_entry
= native_write_gdt_entry
,
329 .write_idt_entry
= native_write_idt_entry
,
330 .load_sp0
= native_load_sp0
,
333 .irq_enable_sysexit
= native_irq_enable_sysexit
,
335 .usersp_sysret
= native_usersp_sysret
,
338 .swapgs
= native_swapgs
,
340 .set_iopl_mask
= native_set_iopl_mask
,
341 .io_delay
= native_io_delay
,
344 .enter
= paravirt_nop
,
345 .leave
= paravirt_nop
,
349 struct pv_apic_ops pv_apic_ops
= {
350 #ifdef CONFIG_X86_LOCAL_APIC
351 .apic_write
= native_apic_write
,
352 .apic_write_atomic
= native_apic_write_atomic
,
353 .apic_read
= native_apic_read
,
354 .setup_boot_clock
= setup_boot_APIC_clock
,
355 .setup_secondary_clock
= setup_secondary_APIC_clock
,
356 .startup_ipi_hook
= paravirt_nop
,
360 struct pv_mmu_ops pv_mmu_ops
= {
361 #ifndef CONFIG_X86_64
362 .pagetable_setup_start
= native_pagetable_setup_start
,
363 .pagetable_setup_done
= native_pagetable_setup_done
,
366 .read_cr2
= native_read_cr2
,
367 .write_cr2
= native_write_cr2
,
368 .read_cr3
= native_read_cr3
,
369 .write_cr3
= native_write_cr3
,
371 .flush_tlb_user
= native_flush_tlb
,
372 .flush_tlb_kernel
= native_flush_tlb_global
,
373 .flush_tlb_single
= native_flush_tlb_single
,
374 .flush_tlb_others
= native_flush_tlb_others
,
376 .pgd_alloc
= __paravirt_pgd_alloc
,
377 .pgd_free
= paravirt_nop
,
379 .alloc_pte
= paravirt_nop
,
380 .alloc_pmd
= paravirt_nop
,
381 .alloc_pmd_clone
= paravirt_nop
,
382 .alloc_pud
= paravirt_nop
,
383 .release_pte
= paravirt_nop
,
384 .release_pmd
= paravirt_nop
,
385 .release_pud
= paravirt_nop
,
387 .set_pte
= native_set_pte
,
388 .set_pte_at
= native_set_pte_at
,
389 .set_pmd
= native_set_pmd
,
390 .pte_update
= paravirt_nop
,
391 .pte_update_defer
= paravirt_nop
,
393 .ptep_modify_prot_start
= __ptep_modify_prot_start
,
394 .ptep_modify_prot_commit
= __ptep_modify_prot_commit
,
396 #ifdef CONFIG_HIGHPTE
397 .kmap_atomic_pte
= kmap_atomic
,
400 #if PAGETABLE_LEVELS >= 3
401 #ifdef CONFIG_X86_PAE
402 .set_pte_atomic
= native_set_pte_atomic
,
403 .set_pte_present
= native_set_pte_present
,
404 .pte_clear
= native_pte_clear
,
405 .pmd_clear
= native_pmd_clear
,
407 .set_pud
= native_set_pud
,
408 .pmd_val
= native_pmd_val
,
409 .make_pmd
= native_make_pmd
,
411 #if PAGETABLE_LEVELS == 4
412 .pud_val
= native_pud_val
,
413 .make_pud
= native_make_pud
,
414 .set_pgd
= native_set_pgd
,
416 #endif /* PAGETABLE_LEVELS >= 3 */
418 .pte_val
= native_pte_val
,
419 .pte_flags
= native_pte_val
,
420 .pgd_val
= native_pgd_val
,
422 .make_pte
= native_make_pte
,
423 .make_pgd
= native_make_pgd
,
425 .dup_mmap
= paravirt_nop
,
426 .exit_mmap
= paravirt_nop
,
427 .activate_mm
= paravirt_nop
,
430 .enter
= paravirt_nop
,
431 .leave
= paravirt_nop
,
434 .set_fixmap
= native_set_fixmap
,
437 EXPORT_SYMBOL_GPL(pv_time_ops
);
438 EXPORT_SYMBOL (pv_cpu_ops
);
439 EXPORT_SYMBOL (pv_mmu_ops
);
440 EXPORT_SYMBOL_GPL(pv_apic_ops
);
441 EXPORT_SYMBOL_GPL(pv_info
);
442 EXPORT_SYMBOL (pv_irq_ops
);