tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __KVM_H
2#define __KVM_H
3
4/*
5 * This work is licensed under the terms of the GNU GPL, version 2. See
6 * the COPYING file in the top-level directory.
7 */
8
9#include <linux/types.h>
10#include <linux/list.h>
11#include <linux/mutex.h>
12#include <linux/spinlock.h>
13#include <linux/mm.h>
14
15#include "vmx.h"
16#include <linux/kvm.h>
17
18#define CR0_PE_MASK (1ULL << 0)
19#define CR0_TS_MASK (1ULL << 3)
20#define CR0_NE_MASK (1ULL << 5)
21#define CR0_WP_MASK (1ULL << 16)
22#define CR0_NW_MASK (1ULL << 29)
23#define CR0_CD_MASK (1ULL << 30)
24#define CR0_PG_MASK (1ULL << 31)
25
26#define CR3_WPT_MASK (1ULL << 3)
27#define CR3_PCD_MASK (1ULL << 4)
28
29#define CR3_RESEVED_BITS 0x07ULL
30#define CR3_L_MODE_RESEVED_BITS (~((1ULL << 40) - 1) | 0x0fe7ULL)
31#define CR3_FLAGS_MASK ((1ULL << 5) - 1)
32
33#define CR4_VME_MASK (1ULL << 0)
34#define CR4_PSE_MASK (1ULL << 4)
35#define CR4_PAE_MASK (1ULL << 5)
36#define CR4_PGE_MASK (1ULL << 7)
37#define CR4_VMXE_MASK (1ULL << 13)
38
39#define KVM_GUEST_CR0_MASK \
40 (CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK \
41 | CR0_NW_MASK | CR0_CD_MASK)
42#define KVM_VM_CR0_ALWAYS_ON \
43 (CR0_PG_MASK | CR0_PE_MASK | CR0_WP_MASK | CR0_NE_MASK)
44#define KVM_GUEST_CR4_MASK \
45 (CR4_PSE_MASK | CR4_PAE_MASK | CR4_PGE_MASK | CR4_VMXE_MASK | CR4_VME_MASK)
46#define KVM_PMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK)
47#define KVM_RMODE_VM_CR4_ALWAYS_ON (CR4_VMXE_MASK | CR4_PAE_MASK | CR4_VME_MASK)
48
49#define INVALID_PAGE (~(hpa_t)0)
50#define UNMAPPED_GVA (~(gpa_t)0)
51
52#define KVM_MAX_VCPUS 1
53#define KVM_MEMORY_SLOTS 4
54#define KVM_NUM_MMU_PAGES 256
55#define KVM_MIN_FREE_MMU_PAGES 5
56#define KVM_REFILL_PAGES 25
57
58#define FX_IMAGE_SIZE 512
59#define FX_IMAGE_ALIGN 16
60#define FX_BUF_SIZE (2 * FX_IMAGE_SIZE + FX_IMAGE_ALIGN)
61
62#define DE_VECTOR 0
63#define DF_VECTOR 8
64#define TS_VECTOR 10
65#define NP_VECTOR 11
66#define SS_VECTOR 12
67#define GP_VECTOR 13
68#define PF_VECTOR 14
69
70#define SELECTOR_TI_MASK (1 << 2)
71#define SELECTOR_RPL_MASK 0x03
72
73#define IOPL_SHIFT 12
74
75/*
76 * Address types:
77 *
78 * gva - guest virtual address
79 * gpa - guest physical address
80 * gfn - guest frame number
81 * hva - host virtual address
82 * hpa - host physical address
83 * hfn - host frame number
84 */
85
86typedef unsigned long gva_t;
87typedef u64 gpa_t;
88typedef unsigned long gfn_t;
89
90typedef unsigned long hva_t;
91typedef u64 hpa_t;
92typedef unsigned long hfn_t;
93
94#define NR_PTE_CHAIN_ENTRIES 5
95
96struct kvm_pte_chain {
97 u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
98 struct hlist_node link;
99};
100
101/*
102 * kvm_mmu_page_role, below, is defined as:
103 *
104 * bits 0:3 - total guest paging levels (2-4, or zero for real mode)
105 * bits 4:7 - page table level for this shadow (1-4)
106 * bits 8:9 - page table quadrant for 2-level guests
107 * bit 16 - "metaphysical" - gfn is not a real page (huge page/real mode)
108 */
109union kvm_mmu_page_role {
110 unsigned word;
111 struct {
112 unsigned glevels : 4;
113 unsigned level : 4;
114 unsigned quadrant : 2;
115 unsigned pad_for_nice_hex_output : 6;
116 unsigned metaphysical : 1;
117 };
118};
119
120struct kvm_mmu_page {
121 struct list_head link;
122 struct hlist_node hash_link;
123
124 /*
125 * The following two entries are used to key the shadow page in the
126 * hash table.
127 */
128 gfn_t gfn;
129 union kvm_mmu_page_role role;
130
131 hpa_t page_hpa;
132 unsigned long slot_bitmap; /* One bit set per slot which has memory
133 * in this shadow page.
134 */
135 int global; /* Set if all ptes in this page are global */
136 int multimapped; /* More than one parent_pte? */
137 int root_count; /* Currently serving as active root */
138 union {
139 u64 *parent_pte; /* !multimapped */
140 struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
141 };
142};
143
144struct vmcs {
145 u32 revision_id;
146 u32 abort;
147 char data[0];
148};
149
150#define vmx_msr_entry kvm_msr_entry
151
152struct kvm_vcpu;
153
154/*
155 * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
156 * 32-bit). The kvm_mmu structure abstracts the details of the current mmu
157 * mode.
158 */
159struct kvm_mmu {
160 void (*new_cr3)(struct kvm_vcpu *vcpu);
161 int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
162 void (*free)(struct kvm_vcpu *vcpu);
163 gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
164 hpa_t root_hpa;
165 int root_level;
166 int shadow_root_level;
167
168 u64 *pae_root;
169};
170
171#define KVM_NR_MEM_OBJS 20
172
173struct kvm_mmu_memory_cache {
174 int nobjs;
175 void *objects[KVM_NR_MEM_OBJS];
176};
177
178/*
179 * We don't want allocation failures within the mmu code, so we preallocate
180 * enough memory for a single page fault in a cache.
181 */
182struct kvm_guest_debug {
183 int enabled;
184 unsigned long bp[4];
185 int singlestep;
186};
187
188enum {
189 VCPU_REGS_RAX = 0,
190 VCPU_REGS_RCX = 1,
191 VCPU_REGS_RDX = 2,
192 VCPU_REGS_RBX = 3,
193 VCPU_REGS_RSP = 4,
194 VCPU_REGS_RBP = 5,
195 VCPU_REGS_RSI = 6,
196 VCPU_REGS_RDI = 7,
197#ifdef CONFIG_X86_64
198 VCPU_REGS_R8 = 8,
199 VCPU_REGS_R9 = 9,
200 VCPU_REGS_R10 = 10,
201 VCPU_REGS_R11 = 11,
202 VCPU_REGS_R12 = 12,
203 VCPU_REGS_R13 = 13,
204 VCPU_REGS_R14 = 14,
205 VCPU_REGS_R15 = 15,
206#endif
207 NR_VCPU_REGS
208};
209
210enum {
211 VCPU_SREG_CS,
212 VCPU_SREG_DS,
213 VCPU_SREG_ES,
214 VCPU_SREG_FS,
215 VCPU_SREG_GS,
216 VCPU_SREG_SS,
217 VCPU_SREG_TR,
218 VCPU_SREG_LDTR,
219};
220
221struct kvm_vcpu {
222 struct kvm *kvm;
223 union {
224 struct vmcs *vmcs;
225 struct vcpu_svm *svm;
226 };
227 struct mutex mutex;
228 int cpu;
229 int launched;
230 int interrupt_window_open;
231 unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
232#define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
233 unsigned long irq_pending[NR_IRQ_WORDS];
234 unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
235 unsigned long rip; /* needs vcpu_load_rsp_rip() */
236
237 unsigned long cr0;
238 unsigned long cr2;
239 unsigned long cr3;
240 unsigned long cr4;
241 unsigned long cr8;
242 u64 pdptrs[4]; /* pae */
243 u64 shadow_efer;
244 u64 apic_base;
245 int nmsrs;
246 struct vmx_msr_entry *guest_msrs;
247 struct vmx_msr_entry *host_msrs;
248
249 struct list_head free_pages;
250 struct kvm_mmu_page page_header_buf[KVM_NUM_MMU_PAGES];
251 struct kvm_mmu mmu;
252
253 struct kvm_mmu_memory_cache mmu_pte_chain_cache;
254 struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
255
256 gfn_t last_pt_write_gfn;
257 int last_pt_write_count;
258
259 struct kvm_guest_debug guest_debug;
260
261 char fx_buf[FX_BUF_SIZE];
262 char *host_fx_image;
263 char *guest_fx_image;
264
265 int mmio_needed;
266 int mmio_read_completed;
267 int mmio_is_write;
268 int mmio_size;
269 unsigned char mmio_data[8];
270 gpa_t mmio_phys_addr;
271
272 struct {
273 int active;
274 u8 save_iopl;
275 struct kvm_save_segment {
276 u16 selector;
277 unsigned long base;
278 u32 limit;
279 u32 ar;
280 } tr, es, ds, fs, gs;
281 } rmode;
282};
283
284struct kvm_memory_slot {
285 gfn_t base_gfn;
286 unsigned long npages;
287 unsigned long flags;
288 struct page **phys_mem;
289 unsigned long *dirty_bitmap;
290};
291
292struct kvm {
293 spinlock_t lock; /* protects everything except vcpus */
294 int nmemslots;
295 struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS];
296 /*
297 * Hash table of struct kvm_mmu_page.
298 */
299 struct list_head active_mmu_pages;
300 int n_free_mmu_pages;
301 struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
302 struct kvm_vcpu vcpus[KVM_MAX_VCPUS];
303 int memory_config_version;
304 int busy;
305 unsigned long rmap_overflow;
306};
307
308struct kvm_stat {
309 u32 pf_fixed;
310 u32 pf_guest;
311 u32 tlb_flush;
312 u32 invlpg;
313
314 u32 exits;
315 u32 io_exits;
316 u32 mmio_exits;
317 u32 signal_exits;
318 u32 irq_window_exits;
319 u32 halt_exits;
320 u32 request_irq_exits;
321 u32 irq_exits;
322};
323
324struct descriptor_table {
325 u16 limit;
326 unsigned long base;
327} __attribute__((packed));
328
329struct kvm_arch_ops {
330 int (*cpu_has_kvm_support)(void); /* __init */
331 int (*disabled_by_bios)(void); /* __init */
332 void (*hardware_enable)(void *dummy); /* __init */
333 void (*hardware_disable)(void *dummy);
334 int (*hardware_setup)(void); /* __init */
335 void (*hardware_unsetup)(void); /* __exit */
336
337 int (*vcpu_create)(struct kvm_vcpu *vcpu);
338 void (*vcpu_free)(struct kvm_vcpu *vcpu);
339
340 struct kvm_vcpu *(*vcpu_load)(struct kvm_vcpu *vcpu);
341 void (*vcpu_put)(struct kvm_vcpu *vcpu);
342
343 int (*set_guest_debug)(struct kvm_vcpu *vcpu,
344 struct kvm_debug_guest *dbg);
345 int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
346 int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
347 u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
348 void (*get_segment)(struct kvm_vcpu *vcpu,
349 struct kvm_segment *var, int seg);
350 void (*set_segment)(struct kvm_vcpu *vcpu,
351 struct kvm_segment *var, int seg);
352 void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
353 void (*decache_cr0_cr4_guest_bits)(struct kvm_vcpu *vcpu);
354 void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
355 void (*set_cr0_no_modeswitch)(struct kvm_vcpu *vcpu,
356 unsigned long cr0);
357 void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
358 void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
359 void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
360 void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
361 void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
362 void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
363 void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
364 unsigned long (*get_dr)(struct kvm_vcpu *vcpu, int dr);
365 void (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value,
366 int *exception);
367 void (*cache_regs)(struct kvm_vcpu *vcpu);
368 void (*decache_regs)(struct kvm_vcpu *vcpu);
369 unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
370 void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
371
372 void (*invlpg)(struct kvm_vcpu *vcpu, gva_t addr);
373 void (*tlb_flush)(struct kvm_vcpu *vcpu);
374 void (*inject_page_fault)(struct kvm_vcpu *vcpu,
375 unsigned long addr, u32 err_code);
376
377 void (*inject_gp)(struct kvm_vcpu *vcpu, unsigned err_code);
378
379 int (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
380 int (*vcpu_setup)(struct kvm_vcpu *vcpu);
381 void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
382};
383
384extern struct kvm_stat kvm_stat;
385extern struct kvm_arch_ops *kvm_arch_ops;
386
387#define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt)
388#define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt)
389
390int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module);
391void kvm_exit_arch(void);
392
393void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
394int kvm_mmu_create(struct kvm_vcpu *vcpu);
395int kvm_mmu_setup(struct kvm_vcpu *vcpu);
396
397int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
398void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot);
399
400hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa);
401#define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
402#define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
403static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
404hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva);
405
406void kvm_emulator_want_group7_invlpg(void);
407
408extern hpa_t bad_page_address;
409
410static inline struct page *gfn_to_page(struct kvm_memory_slot *slot, gfn_t gfn)
411{
412 return slot->phys_mem[gfn - slot->base_gfn];
413}
414
415struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
416void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
417
418enum emulation_result {
419 EMULATE_DONE, /* no further processing */
420 EMULATE_DO_MMIO, /* kvm_run filled with mmio request */
421 EMULATE_FAIL, /* can't emulate this instruction */
422};
423
424int emulate_instruction(struct kvm_vcpu *vcpu, struct kvm_run *run,
425 unsigned long cr2, u16 error_code);
426void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
427void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
428void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
429 unsigned long *rflags);
430
431unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
432void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
433 unsigned long *rflags);
434
435struct x86_emulate_ctxt;
436
437int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
438int emulate_clts(struct kvm_vcpu *vcpu);
439int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
440 unsigned long *dest);
441int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
442 unsigned long value);
443
444void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
445void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr0);
446void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr0);
447void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr0);
448void lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
449
450int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
451int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
452
453void fx_init(struct kvm_vcpu *vcpu);
454
455void load_msrs(struct vmx_msr_entry *e, int n);
456void save_msrs(struct vmx_msr_entry *e, int n);
457void kvm_resched(struct kvm_vcpu *vcpu);
458
459int kvm_read_guest(struct kvm_vcpu *vcpu,
460 gva_t addr,
461 unsigned long size,
462 void *dest);
463
464int kvm_write_guest(struct kvm_vcpu *vcpu,
465 gva_t addr,
466 unsigned long size,
467 void *data);
468
469unsigned long segment_base(u16 selector);
470
471void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
472void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes);
473int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
474void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
475
476static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
477 u32 error_code)
478{
479 if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
480 kvm_mmu_free_some_pages(vcpu);
481 return vcpu->mmu.page_fault(vcpu, gva, error_code);
482}
483
484static inline struct page *_gfn_to_page(struct kvm *kvm, gfn_t gfn)
485{
486 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
487 return (slot) ? slot->phys_mem[gfn - slot->base_gfn] : NULL;
488}
489
490static inline int is_long_mode(struct kvm_vcpu *vcpu)
491{
492#ifdef CONFIG_X86_64
493 return vcpu->shadow_efer & EFER_LME;
494#else
495 return 0;
496#endif
497}
498
499static inline int is_pae(struct kvm_vcpu *vcpu)
500{
501 return vcpu->cr4 & CR4_PAE_MASK;
502}
503
504static inline int is_pse(struct kvm_vcpu *vcpu)
505{
506 return vcpu->cr4 & CR4_PSE_MASK;
507}
508
509static inline int is_paging(struct kvm_vcpu *vcpu)
510{
511 return vcpu->cr0 & CR0_PG_MASK;
512}
513
514static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
515{
516 return slot - kvm->memslots;
517}
518
519static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
520{
521 struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
522
523 return (struct kvm_mmu_page *)page->private;
524}
525
526static inline u16 read_fs(void)
527{
528 u16 seg;
529 asm ("mov %%fs, %0" : "=g"(seg));
530 return seg;
531}
532
533static inline u16 read_gs(void)
534{
535 u16 seg;
536 asm ("mov %%gs, %0" : "=g"(seg));
537 return seg;
538}
539
540static inline u16 read_ldt(void)
541{
542 u16 ldt;
543 asm ("sldt %0" : "=g"(ldt));
544 return ldt;
545}
546
547static inline void load_fs(u16 sel)
548{
549 asm ("mov %0, %%fs" : : "rm"(sel));
550}
551
552static inline void load_gs(u16 sel)
553{
554 asm ("mov %0, %%gs" : : "rm"(sel));
555}
556
557#ifndef load_ldt
558static inline void load_ldt(u16 sel)
559{
560 asm ("lldt %0" : : "g"(sel));
561}
562#endif
563
564static inline void get_idt(struct descriptor_table *table)
565{
566 asm ("sidt %0" : "=m"(*table));
567}
568
569static inline void get_gdt(struct descriptor_table *table)
570{
571 asm ("sgdt %0" : "=m"(*table));
572}
573
574static inline unsigned long read_tr_base(void)
575{
576 u16 tr;
577 asm ("str %0" : "=g"(tr));
578 return segment_base(tr);
579}
580
581#ifdef CONFIG_X86_64
582static inline unsigned long read_msr(unsigned long msr)
583{
584 u64 value;
585
586 rdmsrl(msr, value);
587 return value;
588}
589#endif
590
591static inline void fx_save(void *image)
592{
593 asm ("fxsave (%0)":: "r" (image));
594}
595
596static inline void fx_restore(void *image)
597{
598 asm ("fxrstor (%0)":: "r" (image));
599}
600
601static inline void fpu_init(void)
602{
603 asm ("finit");
604}
605
606static inline u32 get_rdx_init_val(void)
607{
608 return 0x600; /* P6 family */
609}
610
611#define ASM_VMX_VMCLEAR_RAX ".byte 0x66, 0x0f, 0xc7, 0x30"
612#define ASM_VMX_VMLAUNCH ".byte 0x0f, 0x01, 0xc2"
613#define ASM_VMX_VMRESUME ".byte 0x0f, 0x01, 0xc3"
614#define ASM_VMX_VMPTRLD_RAX ".byte 0x0f, 0xc7, 0x30"
615#define ASM_VMX_VMREAD_RDX_RAX ".byte 0x0f, 0x78, 0xd0"
616#define ASM_VMX_VMWRITE_RAX_RDX ".byte 0x0f, 0x79, 0xd0"
617#define ASM_VMX_VMWRITE_RSP_RDX ".byte 0x0f, 0x79, 0xd4"
618#define ASM_VMX_VMXOFF ".byte 0x0f, 0x01, 0xc4"
619#define ASM_VMX_VMXON_RAX ".byte 0xf3, 0x0f, 0xc7, 0x30"
620
621#define MSR_IA32_TIME_STAMP_COUNTER 0x010
622
623#define TSS_IOPB_BASE_OFFSET 0x66
624#define TSS_BASE_SIZE 0x68
625#define TSS_IOPB_SIZE (65536 / 8)
626#define TSS_REDIRECTION_SIZE (256 / 8)
627#define RMODE_TSS_SIZE (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
628
629#endif