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);