Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[linux-2.6] / arch / i386 / kernel / vmi.c
1 /*
2  * VMI specific paravirt-ops implementation
3  *
4  * Copyright (C) 2005, VMware, Inc.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful, but
12  * WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
14  * NON INFRINGEMENT.  See the GNU General Public License for more
15  * details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20  *
21  * Send feedback to zach@vmware.com
22  *
23  */
24
25 #include <linux/module.h>
26 #include <linux/license.h>
27 #include <linux/cpu.h>
28 #include <linux/bootmem.h>
29 #include <linux/mm.h>
30 #include <asm/vmi.h>
31 #include <asm/io.h>
32 #include <asm/fixmap.h>
33 #include <asm/apicdef.h>
34 #include <asm/apic.h>
35 #include <asm/processor.h>
36 #include <asm/timer.h>
37 #include <asm/vmi_time.h>
38
39 /* Convenient for calling VMI functions indirectly in the ROM */
40 typedef u32 __attribute__((regparm(1))) (VROMFUNC)(void);
41 typedef u64 __attribute__((regparm(2))) (VROMLONGFUNC)(int);
42
43 #define call_vrom_func(rom,func) \
44    (((VROMFUNC *)(rom->func))())
45
46 #define call_vrom_long_func(rom,func,arg) \
47    (((VROMLONGFUNC *)(rom->func)) (arg))
48
49 static struct vrom_header *vmi_rom;
50 static int license_gplok;
51 static int disable_nodelay;
52 static int disable_pge;
53 static int disable_pse;
54 static int disable_sep;
55 static int disable_tsc;
56 static int disable_mtrr;
57
58 /* Cached VMI operations */
59 struct {
60         void (*cpuid)(void /* non-c */);
61         void (*_set_ldt)(u32 selector);
62         void (*set_tr)(u32 selector);
63         void (*set_kernel_stack)(u32 selector, u32 esp0);
64         void (*allocate_page)(u32, u32, u32, u32, u32);
65         void (*release_page)(u32, u32);
66         void (*set_pte)(pte_t, pte_t *, unsigned);
67         void (*update_pte)(pte_t *, unsigned);
68         void (*set_linear_mapping)(int, u32, u32, u32);
69         void (*flush_tlb)(int);
70         void (*set_initial_ap_state)(int, int);
71         void (*halt)(void);
72 } vmi_ops;
73
74 /* XXX move this to alternative.h */
75 extern struct paravirt_patch __start_parainstructions[],
76         __stop_parainstructions[];
77
78 /*
79  * VMI patching routines.
80  */
81 #define MNEM_CALL 0xe8
82 #define MNEM_JMP  0xe9
83 #define MNEM_RET  0xc3
84
85 static char irq_save_disable_callout[] = {
86         MNEM_CALL, 0, 0, 0, 0,
87         MNEM_CALL, 0, 0, 0, 0,
88         MNEM_RET
89 };
90 #define IRQ_PATCH_INT_MASK 0
91 #define IRQ_PATCH_DISABLE  5
92
93 static inline void patch_offset(unsigned char *eip, unsigned char *dest)
94 {
95         *(unsigned long *)(eip+1) = dest-eip-5;
96 }
97
98 static unsigned patch_internal(int call, unsigned len, void *insns)
99 {
100         u64 reloc;
101         struct vmi_relocation_info *const rel = (struct vmi_relocation_info *)&reloc;
102         reloc = call_vrom_long_func(vmi_rom, get_reloc, call);
103         switch(rel->type) {
104                 case VMI_RELOCATION_CALL_REL:
105                         BUG_ON(len < 5);
106                         *(char *)insns = MNEM_CALL;
107                         patch_offset(insns, rel->eip);
108                         return 5;
109
110                 case VMI_RELOCATION_JUMP_REL:
111                         BUG_ON(len < 5);
112                         *(char *)insns = MNEM_JMP;
113                         patch_offset(insns, rel->eip);
114                         return 5;
115
116                 case VMI_RELOCATION_NOP:
117                         /* obliterate the whole thing */
118                         return 0;
119
120                 case VMI_RELOCATION_NONE:
121                         /* leave native code in place */
122                         break;
123
124                 default:
125                         BUG();
126         }
127         return len;
128 }
129
130 /*
131  * Apply patch if appropriate, return length of new instruction
132  * sequence.  The callee does nop padding for us.
133  */
134 static unsigned vmi_patch(u8 type, u16 clobbers, void *insns, unsigned len)
135 {
136         switch (type) {
137                 case PARAVIRT_IRQ_DISABLE:
138                         return patch_internal(VMI_CALL_DisableInterrupts, len, insns);
139                 case PARAVIRT_IRQ_ENABLE:
140                         return patch_internal(VMI_CALL_EnableInterrupts, len, insns);
141                 case PARAVIRT_RESTORE_FLAGS:
142                         return patch_internal(VMI_CALL_SetInterruptMask, len, insns);
143                 case PARAVIRT_SAVE_FLAGS:
144                         return patch_internal(VMI_CALL_GetInterruptMask, len, insns);
145                 case PARAVIRT_SAVE_FLAGS_IRQ_DISABLE:
146                         if (len >= 10) {
147                                 patch_internal(VMI_CALL_GetInterruptMask, len, insns);
148                                 patch_internal(VMI_CALL_DisableInterrupts, len-5, insns+5);
149                                 return 10;
150                         } else {
151                                 /*
152                                  * You bastards didn't leave enough room to
153                                  * patch save_flags_irq_disable inline.  Patch
154                                  * to a helper
155                                  */
156                                 BUG_ON(len < 5);
157                                 *(char *)insns = MNEM_CALL;
158                                 patch_offset(insns, irq_save_disable_callout);
159                                 return 5;
160                         }
161                 case PARAVIRT_INTERRUPT_RETURN:
162                         return patch_internal(VMI_CALL_IRET, len, insns);
163                 case PARAVIRT_STI_SYSEXIT:
164                         return patch_internal(VMI_CALL_SYSEXIT, len, insns);
165                 default:
166                         break;
167         }
168         return len;
169 }
170
171 /* CPUID has non-C semantics, and paravirt-ops API doesn't match hardware ISA */
172 static void vmi_cpuid(unsigned int *eax, unsigned int *ebx,
173                                unsigned int *ecx, unsigned int *edx)
174 {
175         int override = 0;
176         if (*eax == 1)
177                 override = 1;
178         asm volatile ("call *%6"
179                       : "=a" (*eax),
180                         "=b" (*ebx),
181                         "=c" (*ecx),
182                         "=d" (*edx)
183                       : "0" (*eax), "2" (*ecx), "r" (vmi_ops.cpuid));
184         if (override) {
185                 if (disable_pse)
186                         *edx &= ~X86_FEATURE_PSE;
187                 if (disable_pge)
188                         *edx &= ~X86_FEATURE_PGE;
189                 if (disable_sep)
190                         *edx &= ~X86_FEATURE_SEP;
191                 if (disable_tsc)
192                         *edx &= ~X86_FEATURE_TSC;
193                 if (disable_mtrr)
194                         *edx &= ~X86_FEATURE_MTRR;
195         }
196 }
197
198 static inline void vmi_maybe_load_tls(struct desc_struct *gdt, int nr, struct desc_struct *new)
199 {
200         if (gdt[nr].a != new->a || gdt[nr].b != new->b)
201                 write_gdt_entry(gdt, nr, new->a, new->b);
202 }
203
204 static void vmi_load_tls(struct thread_struct *t, unsigned int cpu)
205 {
206         struct desc_struct *gdt = get_cpu_gdt_table(cpu);
207         vmi_maybe_load_tls(gdt, GDT_ENTRY_TLS_MIN + 0, &t->tls_array[0]);
208         vmi_maybe_load_tls(gdt, GDT_ENTRY_TLS_MIN + 1, &t->tls_array[1]);
209         vmi_maybe_load_tls(gdt, GDT_ENTRY_TLS_MIN + 2, &t->tls_array[2]);
210 }
211
212 static void vmi_set_ldt(const void *addr, unsigned entries)
213 {
214         unsigned cpu = smp_processor_id();
215         u32 low, high;
216
217         pack_descriptor(&low, &high, (unsigned long)addr,
218                         entries * sizeof(struct desc_struct) - 1,
219                         DESCTYPE_LDT, 0);
220         write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, low, high);
221         vmi_ops._set_ldt(entries ? GDT_ENTRY_LDT*sizeof(struct desc_struct) : 0);
222 }
223
224 static void vmi_set_tr(void)
225 {
226         vmi_ops.set_tr(GDT_ENTRY_TSS*sizeof(struct desc_struct));
227 }
228
229 static void vmi_load_esp0(struct tss_struct *tss,
230                                    struct thread_struct *thread)
231 {
232         tss->esp0 = thread->esp0;
233
234         /* This can only happen when SEP is enabled, no need to test "SEP"arately */
235         if (unlikely(tss->ss1 != thread->sysenter_cs)) {
236                 tss->ss1 = thread->sysenter_cs;
237                 wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
238         }
239         vmi_ops.set_kernel_stack(__KERNEL_DS, tss->esp0);
240 }
241
242 static void vmi_flush_tlb_user(void)
243 {
244         vmi_ops.flush_tlb(VMI_FLUSH_TLB);
245 }
246
247 static void vmi_flush_tlb_kernel(void)
248 {
249         vmi_ops.flush_tlb(VMI_FLUSH_TLB | VMI_FLUSH_GLOBAL);
250 }
251
252 /* Stub to do nothing at all; used for delays and unimplemented calls */
253 static void vmi_nop(void)
254 {
255 }
256
257 /* For NO_IDLE_HZ, we stop the clock when halting the kernel */
258 #ifdef CONFIG_NO_IDLE_HZ
259 static fastcall void vmi_safe_halt(void)
260 {
261         int idle = vmi_stop_hz_timer();
262         vmi_ops.halt();
263         if (idle) {
264                 local_irq_disable();
265                 vmi_account_time_restart_hz_timer();
266                 local_irq_enable();
267         }
268 }
269 #endif
270
271 #ifdef CONFIG_DEBUG_PAGE_TYPE
272
273 #ifdef CONFIG_X86_PAE
274 #define MAX_BOOT_PTS (2048+4+1)
275 #else
276 #define MAX_BOOT_PTS (1024+1)
277 #endif
278
279 /*
280  * During boot, mem_map is not yet available in paging_init, so stash
281  * all the boot page allocations here.
282  */
283 static struct {
284         u32 pfn;
285         int type;
286 } boot_page_allocations[MAX_BOOT_PTS];
287 static int num_boot_page_allocations;
288 static int boot_allocations_applied;
289
290 void vmi_apply_boot_page_allocations(void)
291 {
292         int i;
293         BUG_ON(!mem_map);
294         for (i = 0; i < num_boot_page_allocations; i++) {
295                 struct page *page = pfn_to_page(boot_page_allocations[i].pfn);
296                 page->type = boot_page_allocations[i].type;
297                 page->type = boot_page_allocations[i].type &
298                                 ~(VMI_PAGE_ZEROED | VMI_PAGE_CLONE);
299         }
300         boot_allocations_applied = 1;
301 }
302
303 static void record_page_type(u32 pfn, int type)
304 {
305         BUG_ON(num_boot_page_allocations >= MAX_BOOT_PTS);
306         boot_page_allocations[num_boot_page_allocations].pfn = pfn;
307         boot_page_allocations[num_boot_page_allocations].type = type;
308         num_boot_page_allocations++;
309 }
310
311 static void check_zeroed_page(u32 pfn, int type, struct page *page)
312 {
313         u32 *ptr;
314         int i;
315         int limit = PAGE_SIZE / sizeof(int);
316
317         if (page_address(page))
318                 ptr = (u32 *)page_address(page);
319         else
320                 ptr = (u32 *)__va(pfn << PAGE_SHIFT);
321         /*
322          * When cloning the root in non-PAE mode, only the userspace
323          * pdes need to be zeroed.
324          */
325         if (type & VMI_PAGE_CLONE)
326                 limit = USER_PTRS_PER_PGD;
327         for (i = 0; i < limit; i++)
328                 BUG_ON(ptr[i]);
329 }
330
331 /*
332  * We stash the page type into struct page so we can verify the page
333  * types are used properly.
334  */
335 static void vmi_set_page_type(u32 pfn, int type)
336 {
337         /* PAE can have multiple roots per page - don't track */
338         if (PTRS_PER_PMD > 1 && (type & VMI_PAGE_PDP))
339                 return;
340
341         if (boot_allocations_applied) {
342                 struct page *page = pfn_to_page(pfn);
343                 if (type != VMI_PAGE_NORMAL)
344                         BUG_ON(page->type);
345                 else
346                         BUG_ON(page->type == VMI_PAGE_NORMAL);
347                 page->type = type & ~(VMI_PAGE_ZEROED | VMI_PAGE_CLONE);
348                 if (type & VMI_PAGE_ZEROED)
349                         check_zeroed_page(pfn, type, page);
350         } else {
351                 record_page_type(pfn, type);
352         }
353 }
354
355 static void vmi_check_page_type(u32 pfn, int type)
356 {
357         /* PAE can have multiple roots per page - skip checks */
358         if (PTRS_PER_PMD > 1 && (type & VMI_PAGE_PDP))
359                 return;
360
361         type &= ~(VMI_PAGE_ZEROED | VMI_PAGE_CLONE);
362         if (boot_allocations_applied) {
363                 struct page *page = pfn_to_page(pfn);
364                 BUG_ON((page->type ^ type) & VMI_PAGE_PAE);
365                 BUG_ON(type == VMI_PAGE_NORMAL && page->type);
366                 BUG_ON((type & page->type) == 0);
367         }
368 }
369 #else
370 #define vmi_set_page_type(p,t) do { } while (0)
371 #define vmi_check_page_type(p,t) do { } while (0)
372 #endif
373
374 static void vmi_allocate_pt(u32 pfn)
375 {
376         vmi_set_page_type(pfn, VMI_PAGE_L1);
377         vmi_ops.allocate_page(pfn, VMI_PAGE_L1, 0, 0, 0);
378 }
379
380 static void vmi_allocate_pd(u32 pfn)
381 {
382         /*
383          * This call comes in very early, before mem_map is setup.
384          * It is called only for swapper_pg_dir, which already has
385          * data on it.
386          */
387         vmi_set_page_type(pfn, VMI_PAGE_L2);
388         vmi_ops.allocate_page(pfn, VMI_PAGE_L2, 0, 0, 0);
389 }
390
391 static void vmi_allocate_pd_clone(u32 pfn, u32 clonepfn, u32 start, u32 count)
392 {
393         vmi_set_page_type(pfn, VMI_PAGE_L2 | VMI_PAGE_CLONE);
394         vmi_check_page_type(clonepfn, VMI_PAGE_L2);
395         vmi_ops.allocate_page(pfn, VMI_PAGE_L2 | VMI_PAGE_CLONE, clonepfn, start, count);
396 }
397
398 static void vmi_release_pt(u32 pfn)
399 {
400         vmi_ops.release_page(pfn, VMI_PAGE_L1);
401         vmi_set_page_type(pfn, VMI_PAGE_NORMAL);
402 }
403
404 static void vmi_release_pd(u32 pfn)
405 {
406         vmi_ops.release_page(pfn, VMI_PAGE_L2);
407         vmi_set_page_type(pfn, VMI_PAGE_NORMAL);
408 }
409
410 /*
411  * Helper macros for MMU update flags.  We can defer updates until a flush
412  * or page invalidation only if the update is to the current address space
413  * (otherwise, there is no flush).  We must check against init_mm, since
414  * this could be a kernel update, which usually passes init_mm, although
415  * sometimes this check can be skipped if we know the particular function
416  * is only called on user mode PTEs.  We could change the kernel to pass
417  * current->active_mm here, but in particular, I was unsure if changing
418  * mm/highmem.c to do this would still be correct on other architectures.
419  */
420 #define is_current_as(mm, mustbeuser) ((mm) == current->active_mm ||    \
421                                        (!mustbeuser && (mm) == &init_mm))
422 #define vmi_flags_addr(mm, addr, level, user)                           \
423         ((level) | (is_current_as(mm, user) ?                           \
424                 (VMI_PAGE_CURRENT_AS | ((addr) & VMI_PAGE_VA_MASK)) : 0))
425 #define vmi_flags_addr_defer(mm, addr, level, user)                     \
426         ((level) | (is_current_as(mm, user) ?                           \
427                 (VMI_PAGE_DEFER | VMI_PAGE_CURRENT_AS | ((addr) & VMI_PAGE_VA_MASK)) : 0))
428
429 static void vmi_update_pte(struct mm_struct *mm, u32 addr, pte_t *ptep)
430 {
431         vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE);
432         vmi_ops.update_pte(ptep, vmi_flags_addr(mm, addr, VMI_PAGE_PT, 0));
433 }
434
435 static void vmi_update_pte_defer(struct mm_struct *mm, u32 addr, pte_t *ptep)
436 {
437         vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE);
438         vmi_ops.update_pte(ptep, vmi_flags_addr_defer(mm, addr, VMI_PAGE_PT, 0));
439 }
440
441 static void vmi_set_pte(pte_t *ptep, pte_t pte)
442 {
443         /* XXX because of set_pmd_pte, this can be called on PT or PD layers */
444         vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE | VMI_PAGE_PD);
445         vmi_ops.set_pte(pte, ptep, VMI_PAGE_PT);
446 }
447
448 static void vmi_set_pte_at(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pte)
449 {
450         vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE);
451         vmi_ops.set_pte(pte, ptep, vmi_flags_addr(mm, addr, VMI_PAGE_PT, 0));
452 }
453
454 static void vmi_set_pmd(pmd_t *pmdp, pmd_t pmdval)
455 {
456 #ifdef CONFIG_X86_PAE
457         const pte_t pte = { pmdval.pmd, pmdval.pmd >> 32 };
458         vmi_check_page_type(__pa(pmdp) >> PAGE_SHIFT, VMI_PAGE_PMD);
459 #else
460         const pte_t pte = { pmdval.pud.pgd.pgd };
461         vmi_check_page_type(__pa(pmdp) >> PAGE_SHIFT, VMI_PAGE_PGD);
462 #endif
463         vmi_ops.set_pte(pte, (pte_t *)pmdp, VMI_PAGE_PD);
464 }
465
466 #ifdef CONFIG_X86_PAE
467
468 static void vmi_set_pte_atomic(pte_t *ptep, pte_t pteval)
469 {
470         /*
471          * XXX This is called from set_pmd_pte, but at both PT
472          * and PD layers so the VMI_PAGE_PT flag is wrong.  But
473          * it is only called for large page mapping changes,
474          * the Xen backend, doesn't support large pages, and the
475          * ESX backend doesn't depend on the flag.
476          */
477         set_64bit((unsigned long long *)ptep,pte_val(pteval));
478         vmi_ops.update_pte(ptep, VMI_PAGE_PT);
479 }
480
481 static void vmi_set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
482 {
483         vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE);
484         vmi_ops.set_pte(pte, ptep, vmi_flags_addr_defer(mm, addr, VMI_PAGE_PT, 1));
485 }
486
487 static void vmi_set_pud(pud_t *pudp, pud_t pudval)
488 {
489         /* Um, eww */
490         const pte_t pte = { pudval.pgd.pgd, pudval.pgd.pgd >> 32 };
491         vmi_check_page_type(__pa(pudp) >> PAGE_SHIFT, VMI_PAGE_PGD);
492         vmi_ops.set_pte(pte, (pte_t *)pudp, VMI_PAGE_PDP);
493 }
494
495 static void vmi_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
496 {
497         const pte_t pte = { 0 };
498         vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE);
499         vmi_ops.set_pte(pte, ptep, vmi_flags_addr(mm, addr, VMI_PAGE_PT, 0));
500 }
501
502 void vmi_pmd_clear(pmd_t *pmd)
503 {
504         const pte_t pte = { 0 };
505         vmi_check_page_type(__pa(pmd) >> PAGE_SHIFT, VMI_PAGE_PMD);
506         vmi_ops.set_pte(pte, (pte_t *)pmd, VMI_PAGE_PD);
507 }
508 #endif
509
510 #ifdef CONFIG_SMP
511 struct vmi_ap_state ap;
512 extern void setup_pda(void);
513
514 static void __init /* XXX cpu hotplug */
515 vmi_startup_ipi_hook(int phys_apicid, unsigned long start_eip,
516                      unsigned long start_esp)
517 {
518         /* Default everything to zero.  This is fine for most GPRs. */
519         memset(&ap, 0, sizeof(struct vmi_ap_state));
520
521         ap.gdtr_limit = GDT_SIZE - 1;
522         ap.gdtr_base = (unsigned long) get_cpu_gdt_table(phys_apicid);
523
524         ap.idtr_limit = IDT_ENTRIES * 8 - 1;
525         ap.idtr_base = (unsigned long) idt_table;
526
527         ap.ldtr = 0;
528
529         ap.cs = __KERNEL_CS;
530         ap.eip = (unsigned long) start_eip;
531         ap.ss = __KERNEL_DS;
532         ap.esp = (unsigned long) start_esp;
533
534         ap.ds = __USER_DS;
535         ap.es = __USER_DS;
536         ap.fs = __KERNEL_PDA;
537         ap.gs = 0;
538
539         ap.eflags = 0;
540
541         setup_pda();
542
543 #ifdef CONFIG_X86_PAE
544         /* efer should match BSP efer. */
545         if (cpu_has_nx) {
546                 unsigned l, h;
547                 rdmsr(MSR_EFER, l, h);
548                 ap.efer = (unsigned long long) h << 32 | l;
549         }
550 #endif
551
552         ap.cr3 = __pa(swapper_pg_dir);
553         /* Protected mode, paging, AM, WP, NE, MP. */
554         ap.cr0 = 0x80050023;
555         ap.cr4 = mmu_cr4_features;
556         vmi_ops.set_initial_ap_state(__pa(&ap), phys_apicid);
557 }
558 #endif
559
560 static inline int __init check_vmi_rom(struct vrom_header *rom)
561 {
562         struct pci_header *pci;
563         struct pnp_header *pnp;
564         const char *manufacturer = "UNKNOWN";
565         const char *product = "UNKNOWN";
566         const char *license = "unspecified";
567
568         if (rom->rom_signature != 0xaa55)
569                 return 0;
570         if (rom->vrom_signature != VMI_SIGNATURE)
571                 return 0;
572         if (rom->api_version_maj != VMI_API_REV_MAJOR ||
573             rom->api_version_min+1 < VMI_API_REV_MINOR+1) {
574                 printk(KERN_WARNING "VMI: Found mismatched rom version %d.%d\n",
575                                 rom->api_version_maj,
576                                 rom->api_version_min);
577                 return 0;
578         }
579
580         /*
581          * Relying on the VMI_SIGNATURE field is not 100% safe, so check
582          * the PCI header and device type to make sure this is really a
583          * VMI device.
584          */
585         if (!rom->pci_header_offs) {
586                 printk(KERN_WARNING "VMI: ROM does not contain PCI header.\n");
587                 return 0;
588         }
589
590         pci = (struct pci_header *)((char *)rom+rom->pci_header_offs);
591         if (pci->vendorID != PCI_VENDOR_ID_VMWARE ||
592             pci->deviceID != PCI_DEVICE_ID_VMWARE_VMI) {
593                 /* Allow it to run... anyways, but warn */
594                 printk(KERN_WARNING "VMI: ROM from unknown manufacturer\n");
595         }
596
597         if (rom->pnp_header_offs) {
598                 pnp = (struct pnp_header *)((char *)rom+rom->pnp_header_offs);
599                 if (pnp->manufacturer_offset)
600                         manufacturer = (const char *)rom+pnp->manufacturer_offset;
601                 if (pnp->product_offset)
602                         product = (const char *)rom+pnp->product_offset;
603         }
604
605         if (rom->license_offs)
606                 license = (char *)rom+rom->license_offs;
607
608         printk(KERN_INFO "VMI: Found %s %s, API version %d.%d, ROM version %d.%d\n",
609                 manufacturer, product,
610                 rom->api_version_maj, rom->api_version_min,
611                 pci->rom_version_maj, pci->rom_version_min);
612
613         license_gplok = license_is_gpl_compatible(license);
614         if (!license_gplok) {
615                 printk(KERN_WARNING "VMI: ROM license '%s' taints kernel... "
616                        "inlining disabled\n",
617                        license);
618                 add_taint(TAINT_PROPRIETARY_MODULE);
619         }
620         return 1;
621 }
622
623 /*
624  * Probe for the VMI option ROM
625  */
626 static inline int __init probe_vmi_rom(void)
627 {
628         unsigned long base;
629
630         /* VMI ROM is in option ROM area, check signature */
631         for (base = 0xC0000; base < 0xE0000; base += 2048) {
632                 struct vrom_header *romstart;
633                 romstart = (struct vrom_header *)isa_bus_to_virt(base);
634                 if (check_vmi_rom(romstart)) {
635                         vmi_rom = romstart;
636                         return 1;
637                 }
638         }
639         return 0;
640 }
641
642 /*
643  * VMI setup common to all processors
644  */
645 void vmi_bringup(void)
646 {
647         /* We must establish the lowmem mapping for MMU ops to work */
648         if (vmi_rom)
649                 vmi_ops.set_linear_mapping(0, __PAGE_OFFSET, max_low_pfn, 0);
650 }
651
652 /*
653  * Return a pointer to the VMI function or a NOP stub
654  */
655 static void *vmi_get_function(int vmicall)
656 {
657         u64 reloc;
658         const struct vmi_relocation_info *rel = (struct vmi_relocation_info *)&reloc;
659         reloc = call_vrom_long_func(vmi_rom, get_reloc, vmicall);
660         BUG_ON(rel->type == VMI_RELOCATION_JUMP_REL);
661         if (rel->type == VMI_RELOCATION_CALL_REL)
662                 return (void *)rel->eip;
663         else
664                 return (void *)vmi_nop;
665 }
666
667 /*
668  * Helper macro for making the VMI paravirt-ops fill code readable.
669  * For unimplemented operations, fall back to default.
670  */
671 #define para_fill(opname, vmicall)                              \
672 do {                                                            \
673         reloc = call_vrom_long_func(vmi_rom, get_reloc,         \
674                                     VMI_CALL_##vmicall);        \
675         if (rel->type != VMI_RELOCATION_NONE) {                 \
676                 BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);   \
677                 paravirt_ops.opname = (void *)rel->eip;         \
678         }                                                       \
679 } while (0)
680
681 /*
682  * Activate the VMI interface and switch into paravirtualized mode
683  */
684 static inline int __init activate_vmi(void)
685 {
686         short kernel_cs;
687         u64 reloc;
688         const struct vmi_relocation_info *rel = (struct vmi_relocation_info *)&reloc;
689
690         if (call_vrom_func(vmi_rom, vmi_init) != 0) {
691                 printk(KERN_ERR "VMI ROM failed to initialize!");
692                 return 0;
693         }
694         savesegment(cs, kernel_cs);
695
696         paravirt_ops.paravirt_enabled = 1;
697         paravirt_ops.kernel_rpl = kernel_cs & SEGMENT_RPL_MASK;
698
699         paravirt_ops.patch = vmi_patch;
700         paravirt_ops.name = "vmi";
701
702         /*
703          * Many of these operations are ABI compatible with VMI.
704          * This means we can fill in the paravirt-ops with direct
705          * pointers into the VMI ROM.  If the calling convention for
706          * these operations changes, this code needs to be updated.
707          *
708          * Exceptions
709          *  CPUID paravirt-op uses pointers, not the native ISA
710          *  halt has no VMI equivalent; all VMI halts are "safe"
711          *  no MSR support yet - just trap and emulate.  VMI uses the
712          *    same ABI as the native ISA, but Linux wants exceptions
713          *    from bogus MSR read / write handled
714          *  rdpmc is not yet used in Linux
715          */
716
717         /* CPUID is special, so very special */
718         reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_CPUID);
719         if (rel->type != VMI_RELOCATION_NONE) {
720                 BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
721                 vmi_ops.cpuid = (void *)rel->eip;
722                 paravirt_ops.cpuid = vmi_cpuid;
723         }
724
725         para_fill(clts, CLTS);
726         para_fill(get_debugreg, GetDR);
727         para_fill(set_debugreg, SetDR);
728         para_fill(read_cr0, GetCR0);
729         para_fill(read_cr2, GetCR2);
730         para_fill(read_cr3, GetCR3);
731         para_fill(read_cr4, GetCR4);
732         para_fill(write_cr0, SetCR0);
733         para_fill(write_cr2, SetCR2);
734         para_fill(write_cr3, SetCR3);
735         para_fill(write_cr4, SetCR4);
736         para_fill(save_fl, GetInterruptMask);
737         para_fill(restore_fl, SetInterruptMask);
738         para_fill(irq_disable, DisableInterrupts);
739         para_fill(irq_enable, EnableInterrupts);
740         /* irq_save_disable !!! sheer pain */
741         patch_offset(&irq_save_disable_callout[IRQ_PATCH_INT_MASK],
742                      (char *)paravirt_ops.save_fl);
743         patch_offset(&irq_save_disable_callout[IRQ_PATCH_DISABLE],
744                      (char *)paravirt_ops.irq_disable);
745 #ifndef CONFIG_NO_IDLE_HZ
746         para_fill(safe_halt, Halt);
747 #else
748         vmi_ops.halt = vmi_get_function(VMI_CALL_Halt);
749         paravirt_ops.safe_halt = vmi_safe_halt;
750 #endif
751         para_fill(wbinvd, WBINVD);
752         /* paravirt_ops.read_msr = vmi_rdmsr */
753         /* paravirt_ops.write_msr = vmi_wrmsr */
754         para_fill(read_tsc, RDTSC);
755         /* paravirt_ops.rdpmc = vmi_rdpmc */
756
757         /* TR interface doesn't pass TR value */
758         reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_SetTR);
759         if (rel->type != VMI_RELOCATION_NONE) {
760                 BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
761                 vmi_ops.set_tr = (void *)rel->eip;
762                 paravirt_ops.load_tr_desc = vmi_set_tr;
763         }
764
765         /* LDT is special, too */
766         reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_SetLDT);
767         if (rel->type != VMI_RELOCATION_NONE) {
768                 BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
769                 vmi_ops._set_ldt = (void *)rel->eip;
770                 paravirt_ops.set_ldt = vmi_set_ldt;
771         }
772
773         para_fill(load_gdt, SetGDT);
774         para_fill(load_idt, SetIDT);
775         para_fill(store_gdt, GetGDT);
776         para_fill(store_idt, GetIDT);
777         para_fill(store_tr, GetTR);
778         paravirt_ops.load_tls = vmi_load_tls;
779         para_fill(write_ldt_entry, WriteLDTEntry);
780         para_fill(write_gdt_entry, WriteGDTEntry);
781         para_fill(write_idt_entry, WriteIDTEntry);
782         reloc = call_vrom_long_func(vmi_rom, get_reloc,
783                                     VMI_CALL_UpdateKernelStack);
784         if (rel->type != VMI_RELOCATION_NONE) {
785                 BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
786                 vmi_ops.set_kernel_stack = (void *)rel->eip;
787                 paravirt_ops.load_esp0 = vmi_load_esp0;
788         }
789
790         para_fill(set_iopl_mask, SetIOPLMask);
791         paravirt_ops.io_delay = (void *)vmi_nop;
792         if (!disable_nodelay) {
793                 paravirt_ops.const_udelay = (void *)vmi_nop;
794         }
795
796         para_fill(set_lazy_mode, SetLazyMode);
797
798         reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_FlushTLB);
799         if (rel->type != VMI_RELOCATION_NONE) {
800                 vmi_ops.flush_tlb = (void *)rel->eip;
801                 paravirt_ops.flush_tlb_user = vmi_flush_tlb_user;
802                 paravirt_ops.flush_tlb_kernel = vmi_flush_tlb_kernel;
803         }
804         para_fill(flush_tlb_single, InvalPage);
805
806         /*
807          * Until a standard flag format can be agreed on, we need to
808          * implement these as wrappers in Linux.  Get the VMI ROM
809          * function pointers for the two backend calls.
810          */
811 #ifdef CONFIG_X86_PAE
812         vmi_ops.set_pte = vmi_get_function(VMI_CALL_SetPxELong);
813         vmi_ops.update_pte = vmi_get_function(VMI_CALL_UpdatePxELong);
814 #else
815         vmi_ops.set_pte = vmi_get_function(VMI_CALL_SetPxE);
816         vmi_ops.update_pte = vmi_get_function(VMI_CALL_UpdatePxE);
817 #endif
818         vmi_ops.set_linear_mapping = vmi_get_function(VMI_CALL_SetLinearMapping);
819         vmi_ops.allocate_page = vmi_get_function(VMI_CALL_AllocatePage);
820         vmi_ops.release_page = vmi_get_function(VMI_CALL_ReleasePage);
821
822         paravirt_ops.alloc_pt = vmi_allocate_pt;
823         paravirt_ops.alloc_pd = vmi_allocate_pd;
824         paravirt_ops.alloc_pd_clone = vmi_allocate_pd_clone;
825         paravirt_ops.release_pt = vmi_release_pt;
826         paravirt_ops.release_pd = vmi_release_pd;
827         paravirt_ops.set_pte = vmi_set_pte;
828         paravirt_ops.set_pte_at = vmi_set_pte_at;
829         paravirt_ops.set_pmd = vmi_set_pmd;
830         paravirt_ops.pte_update = vmi_update_pte;
831         paravirt_ops.pte_update_defer = vmi_update_pte_defer;
832 #ifdef CONFIG_X86_PAE
833         paravirt_ops.set_pte_atomic = vmi_set_pte_atomic;
834         paravirt_ops.set_pte_present = vmi_set_pte_present;
835         paravirt_ops.set_pud = vmi_set_pud;
836         paravirt_ops.pte_clear = vmi_pte_clear;
837         paravirt_ops.pmd_clear = vmi_pmd_clear;
838 #endif
839         /*
840          * These MUST always be patched.  Don't support indirect jumps
841          * through these operations, as the VMI interface may use either
842          * a jump or a call to get to these operations, depending on
843          * the backend.  They are performance critical anyway, so requiring
844          * a patch is not a big problem.
845          */
846         paravirt_ops.irq_enable_sysexit = (void *)0xfeedbab0;
847         paravirt_ops.iret = (void *)0xbadbab0;
848
849 #ifdef CONFIG_SMP
850         paravirt_ops.startup_ipi_hook = vmi_startup_ipi_hook;
851         vmi_ops.set_initial_ap_state = vmi_get_function(VMI_CALL_SetInitialAPState);
852 #endif
853
854 #ifdef CONFIG_X86_LOCAL_APIC
855         paravirt_ops.apic_read = vmi_get_function(VMI_CALL_APICRead);
856         paravirt_ops.apic_write = vmi_get_function(VMI_CALL_APICWrite);
857         paravirt_ops.apic_write_atomic = vmi_get_function(VMI_CALL_APICWrite);
858 #endif
859
860         /*
861          * Check for VMI timer functionality by probing for a cycle frequency method
862          */
863         reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_GetCycleFrequency);
864         if (rel->type != VMI_RELOCATION_NONE) {
865                 vmi_timer_ops.get_cycle_frequency = (void *)rel->eip;
866                 vmi_timer_ops.get_cycle_counter =
867                         vmi_get_function(VMI_CALL_GetCycleCounter);
868                 vmi_timer_ops.get_wallclock =
869                         vmi_get_function(VMI_CALL_GetWallclockTime);
870                 vmi_timer_ops.wallclock_updated =
871                         vmi_get_function(VMI_CALL_WallclockUpdated);
872                 vmi_timer_ops.set_alarm = vmi_get_function(VMI_CALL_SetAlarm);
873                 vmi_timer_ops.cancel_alarm =
874                          vmi_get_function(VMI_CALL_CancelAlarm);
875                 paravirt_ops.time_init = vmi_time_init;
876                 paravirt_ops.get_wallclock = vmi_get_wallclock;
877                 paravirt_ops.set_wallclock = vmi_set_wallclock;
878 #ifdef CONFIG_X86_LOCAL_APIC
879                 paravirt_ops.setup_boot_clock = vmi_timer_setup_boot_alarm;
880                 paravirt_ops.setup_secondary_clock = vmi_timer_setup_secondary_alarm;
881 #endif
882                 custom_sched_clock = vmi_sched_clock;
883         }
884
885         /*
886          * Alternative instruction rewriting doesn't happen soon enough
887          * to convert VMI_IRET to a call instead of a jump; so we have
888          * to do this before IRQs get reenabled.  Fortunately, it is
889          * idempotent.
890          */
891         apply_paravirt(__start_parainstructions, __stop_parainstructions);
892
893         vmi_bringup();
894
895         return 1;
896 }
897
898 #undef para_fill
899
900 void __init vmi_init(void)
901 {
902         unsigned long flags;
903
904         if (!vmi_rom)
905                 probe_vmi_rom();
906         else
907                 check_vmi_rom(vmi_rom);
908
909         /* In case probing for or validating the ROM failed, basil */
910         if (!vmi_rom)
911                 return;
912
913         reserve_top_address(-vmi_rom->virtual_top);
914
915         local_irq_save(flags);
916         activate_vmi();
917 #ifdef CONFIG_SMP
918         no_timer_check = 1;
919 #endif
920         local_irq_restore(flags & X86_EFLAGS_IF);
921 }
922
923 static int __init parse_vmi(char *arg)
924 {
925         if (!arg)
926                 return -EINVAL;
927
928         if (!strcmp(arg, "disable_nodelay"))
929                 disable_nodelay = 1;
930         else if (!strcmp(arg, "disable_pge")) {
931                 clear_bit(X86_FEATURE_PGE, boot_cpu_data.x86_capability);
932                 disable_pge = 1;
933         } else if (!strcmp(arg, "disable_pse")) {
934                 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
935                 disable_pse = 1;
936         } else if (!strcmp(arg, "disable_sep")) {
937                 clear_bit(X86_FEATURE_SEP, boot_cpu_data.x86_capability);
938                 disable_sep = 1;
939         } else if (!strcmp(arg, "disable_tsc")) {
940                 clear_bit(X86_FEATURE_TSC, boot_cpu_data.x86_capability);
941                 disable_tsc = 1;
942         } else if (!strcmp(arg, "disable_mtrr")) {
943                 clear_bit(X86_FEATURE_MTRR, boot_cpu_data.x86_capability);
944                 disable_mtrr = 1;
945         }
946         return 0;
947 }
948
949 early_param("vmi", parse_vmi);