~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/include/asm-x86_64/desc.h

Version: ~ [ linux-5.0-rc6 ] ~ [ linux-4.20.7 ] ~ [ linux-4.19.20 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.98 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.155 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.174 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.134 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.62 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* Written 2000 by Andi Kleen */ 
  2 #ifndef __ARCH_DESC_H
  3 #define __ARCH_DESC_H
  4 
  5 #include <linux/threads.h>
  6 #include <asm/ldt.h>
  7 
  8 #ifndef __ASSEMBLY__
  9 
 10 #include <linux/string.h>
 11 #include <asm/segment.h>
 12 #include <asm/mmu.h>
 13 
 14 // 8 byte segment descriptor
 15 struct desc_struct { 
 16         u16 limit0;
 17         u16 base0;
 18         unsigned base1 : 8, type : 4, s : 1, dpl : 2, p : 1;
 19         unsigned limit : 4, avl : 1, l : 1, d : 1, g : 1, base2 : 8;
 20 } __attribute__((packed)); 
 21 
 22 struct n_desc_struct { 
 23         unsigned int a,b;
 24 };      
 25 
 26 extern struct desc_struct cpu_gdt_table[NR_CPUS][GDT_ENTRIES];
 27 
 28 enum { 
 29         GATE_INTERRUPT = 0xE, 
 30         GATE_TRAP = 0xF,        
 31         GATE_CALL = 0xC,
 32 };      
 33 
 34 // 16byte gate
 35 struct gate_struct {          
 36         u16 offset_low;
 37         u16 segment; 
 38         unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;
 39         u16 offset_middle;
 40         u32 offset_high;
 41         u32 zero1; 
 42 } __attribute__((packed));
 43 
 44 #define PTR_LOW(x) ((unsigned long)(x) & 0xFFFF) 
 45 #define PTR_MIDDLE(x) (((unsigned long)(x) >> 16) & 0xFFFF)
 46 #define PTR_HIGH(x) ((unsigned long)(x) >> 32)
 47 
 48 enum { 
 49         DESC_TSS = 0x9,
 50         DESC_LDT = 0x2,
 51 }; 
 52 
 53 // LDT or TSS descriptor in the GDT. 16 bytes.
 54 struct ldttss_desc { 
 55         u16 limit0;
 56         u16 base0;
 57         unsigned base1 : 8, type : 5, dpl : 2, p : 1;
 58         unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;
 59         u32 base3;
 60         u32 zero1; 
 61 } __attribute__((packed)); 
 62 
 63 struct desc_ptr {
 64         unsigned short size;
 65         unsigned long address;
 66 } __attribute__((packed)) ;
 67 
 68 #define load_TR_desc() asm volatile("ltr %w0"::"r" (GDT_ENTRY_TSS*8))
 69 #define load_LDT_desc() asm volatile("lldt %w0"::"r" (GDT_ENTRY_LDT*8))
 70 #define clear_LDT()  asm volatile("lldt %w0"::"r" (0))
 71 
 72 /*
 73  * This is the ldt that every process will get unless we need
 74  * something other than this.
 75  */
 76 extern struct desc_struct default_ldt[];
 77 extern struct gate_struct idt_table[]; 
 78 
 79 static inline void _set_gate(void *adr, unsigned type, unsigned long func, unsigned dpl, unsigned ist)  
 80 {
 81         struct gate_struct s;   
 82         s.offset_low = PTR_LOW(func); 
 83         s.segment = __KERNEL_CS;
 84         s.ist = ist; 
 85         s.p = 1;
 86         s.dpl = dpl; 
 87         s.zero0 = 0;
 88         s.zero1 = 0; 
 89         s.type = type; 
 90         s.offset_middle = PTR_MIDDLE(func); 
 91         s.offset_high = PTR_HIGH(func); 
 92         /* does not need to be atomic because it is only done once at setup time */ 
 93         memcpy(adr, &s, 16); 
 94 } 
 95 
 96 static inline void set_intr_gate(int nr, void *func) 
 97 { 
 98         _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, 0); 
 99 } 
100 
101 static inline void set_intr_gate_ist(int nr, void *func, unsigned ist) 
102 { 
103         _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, ist); 
104 } 
105 
106 static inline void set_system_gate(int nr, void *func) 
107 { 
108         _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, 0); 
109 } 
110 
111 static inline void set_tssldt_descriptor(void *ptr, unsigned long tss, unsigned type, 
112                                          unsigned size) 
113 { 
114         struct ldttss_desc d;
115         memset(&d,0,sizeof(d)); 
116         d.limit0 = size & 0xFFFF;
117         d.base0 = PTR_LOW(tss); 
118         d.base1 = PTR_MIDDLE(tss) & 0xFF; 
119         d.type = type;
120         d.p = 1; 
121         d.limit1 = (size >> 16) & 0xF;
122         d.base2 = (PTR_MIDDLE(tss) >> 8) & 0xFF; 
123         d.base3 = PTR_HIGH(tss); 
124         memcpy(ptr, &d, 16); 
125 }
126 
127 static inline void set_tss_desc(unsigned cpu, void *addr)
128 { 
129         set_tssldt_descriptor(&cpu_gdt_table[cpu][GDT_ENTRY_TSS], (unsigned long)addr, 
130                               DESC_TSS,
131                               sizeof(struct tss_struct)); 
132 } 
133 
134 static inline void set_ldt_desc(unsigned cpu, void *addr, int size)
135 { 
136         set_tssldt_descriptor(&cpu_gdt_table[cpu][GDT_ENTRY_LDT], (unsigned long)addr, 
137                               DESC_LDT, size); 
138 }
139 
140 static inline void set_seg_base(unsigned cpu, int entry, void *base)
141 { 
142         struct desc_struct *d = &cpu_gdt_table[cpu][entry];
143         u32 addr = (u32)(u64)base;
144         BUG_ON((u64)base >> 32); 
145         d->base0 = addr & 0xffff;
146         d->base1 = (addr >> 16) & 0xff;
147         d->base2 = (addr >> 24) & 0xff;
148 } 
149 
150 #define LDT_entry_a(info) \
151         ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
152 /* Don't allow setting of the lm bit. It is useless anyways because 
153    64bit system calls require __USER_CS. */ 
154 #define LDT_entry_b(info) \
155         (((info)->base_addr & 0xff000000) | \
156         (((info)->base_addr & 0x00ff0000) >> 16) | \
157         ((info)->limit & 0xf0000) | \
158         (((info)->read_exec_only ^ 1) << 9) | \
159         ((info)->contents << 10) | \
160         (((info)->seg_not_present ^ 1) << 15) | \
161         ((info)->seg_32bit << 22) | \
162         ((info)->limit_in_pages << 23) | \
163         ((info)->useable << 20) | \
164         /* ((info)->lm << 21) | */ \
165         0x7000)
166 
167 #define LDT_empty(info) (\
168         (info)->base_addr       == 0    && \
169         (info)->limit           == 0    && \
170         (info)->contents        == 0    && \
171         (info)->read_exec_only  == 1    && \
172         (info)->seg_32bit       == 0    && \
173         (info)->limit_in_pages  == 0    && \
174         (info)->seg_not_present == 1    && \
175         (info)->useable         == 0    && \
176         (info)->lm              == 0)
177 
178 #if TLS_SIZE != 24
179 # error update this code.
180 #endif
181 
182 static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
183 {
184         u64 *gdt = (u64 *)(cpu_gdt_table[cpu] + GDT_ENTRY_TLS_MIN);
185         gdt[0] = t->tls_array[0];
186         gdt[1] = t->tls_array[1];
187         gdt[2] = t->tls_array[2];
188 } 
189 
190 /*
191  * load one particular LDT into the current CPU
192  */
193 extern inline void load_LDT_nolock (mm_context_t *pc, int cpu)
194 {
195         int count = pc->size;
196 
197         if (likely(!count)) {
198                 clear_LDT();
199                 return;
200         }
201                 
202         set_ldt_desc(cpu, pc->ldt, count);
203         load_LDT_desc();
204 }
205 
206 static inline void load_LDT(mm_context_t *pc)
207 {
208         int cpu = get_cpu();
209         load_LDT_nolock(pc, cpu);
210         put_cpu();
211 }
212 
213 #endif /* !__ASSEMBLY__ */
214 
215 #endif
216 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp