http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/asm-x86_64/desc.h

/* Written 2000 by Andi Kleen */ #ifndef __ARCH_DESC_H #define __ARCH_DESC_H #include <linux/threads.h> #include <asm/ldt.h> #ifndef __ASSEMBLY__ #include <linux/string.h> #include <linux/smp.h> #include <asm/segment.h> #include <asm/mmu.h> // 8 byte segment descriptor struct desc_struct { u16 limit0; u16 base0; unsigned base1 : 8, type : 4, s : 1, dpl : 2, p : 1; unsigned limit : 4, avl : 1, l : 1, d : 1, g : 1, base2 : 8; } __attribute__((packed)); struct n_desc_struct { unsigned int a,b; }; extern struct desc_struct cpu_gdt_table[GDT_ENTRIES]; enum { GATE_INTERRUPT = 0xE, GATE_TRAP = 0xF, GATE_CALL = 0xC, }; // 16byte gate struct gate_struct { u16 offset_low; u16 segment; unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1; u16 offset_middle; u32 offset_high; u32 zero1; } __attribute__((packed)); #define PTR_LOW(x) ((unsigned long)(x) & 0xFFFF) #define PTR_MIDDLE(x) (((unsigned long)(x) >> 16) & 0xFFFF) #define PTR_HIGH(x) ((unsigned long)(x) >> 32) enum { DESC_TSS = 0x9, DESC_LDT = 0x2, }; // LDT or TSS descriptor in the GDT. 16 bytes. struct ldttss_desc { u16 limit0; u16 base0; unsigned base1 : 8, type : 5, dpl : 2, p : 1; unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8; u32 base3; u32 zero1; } __attribute__((packed)); struct desc_ptr { unsigned short size; unsigned long address; } __attribute__((packed)) ; #define load_TR_desc() asm volatile("ltr %w0"::"r" (GDT_ENTRY_TSS*8)) #define load_LDT_desc() asm volatile("lldt %w0"::"r" (GDT_ENTRY_LDT*8)) #define clear_LDT() asm volatile("lldt %w0"::"r" (0)) /* * This is the ldt that every process will get unless we need * something other than this. */ extern struct desc_struct default_ldt[]; extern struct gate_struct idt_table[]; extern struct desc_ptr cpu_gdt_descr[]; /* the cpu gdt accessor */ #define cpu_gdt(_cpu) ((struct desc_struct *)cpu_gdt_descr[_cpu].address) static inline void _set_gate(void *adr, unsigned type, unsigned long func, unsigned dpl, unsigned ist) { struct gate_struct s; s.offset_low = PTR_LOW(func); s.segment = __KERNEL_CS; s.ist = ist; s.p = 1; s.dpl = dpl; s.zero0 = 0; s.zero1 = 0; s.type = type; s.offset_middle = PTR_MIDDLE(func); s.offset_high = PTR_HIGH(func); /* does not need to be atomic because it is only done once at setup time */ memcpy(adr, &s, 16); } static inline void set_intr_gate(int nr, void *func) { BUG_ON((unsigned)nr > 0xFF); _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, 0); } static inline void set_intr_gate_ist(int nr, void *func, unsigned ist) { BUG_ON((unsigned)nr > 0xFF); _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, ist); } static inline void set_system_gate(int nr, void *func) { BUG_ON((unsigned)nr > 0xFF); _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, 0); } static inline void set_system_gate_ist(int nr, void *func, unsigned ist) { _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, ist); } static inline void set_tssldt_descriptor(void *ptr, unsigned long tss, unsigned type, unsigned size) { struct ldttss_desc d; memset(&d,0,sizeof(d)); d.limit0 = size & 0xFFFF; d.base0 = PTR_LOW(tss); d.base1 = PTR_MIDDLE(tss) & 0xFF; d.type = type; d.p = 1; d.limit1 = (size >> 16) & 0xF; d.base2 = (PTR_MIDDLE(tss) >> 8) & 0xFF; d.base3 = PTR_HIGH(tss); memcpy(ptr, &d, 16); } static inline void set_tss_desc(unsigned cpu, void *addr) { /* * sizeof(unsigned long) coming from an extra "long" at the end * of the iobitmap. See tss_struct definition in processor.h * * -1? seg base+limit should be pointing to the address of the * last valid byte */ set_tssldt_descriptor(&cpu_gdt(cpu)[GDT_ENTRY_TSS], (unsigned long)addr, DESC_TSS, IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1); } static inline void set_ldt_desc(unsigned cpu, void *addr, int size) { set_tssldt_descriptor(&cpu_gdt(cpu)[GDT_ENTRY_LDT], (unsigned long)addr, DESC_LDT, size * 8 - 1); } static inline void set_seg_base(unsigned cpu, int entry, void *base) { struct desc_struct *d = &cpu_gdt(cpu)[entry]; u32 addr = (u32)(u64)base; BUG_ON((u64)base >> 32); d->base0 = addr & 0xffff; d->base1 = (addr >> 16) & 0xff; d->base2 = (addr >> 24) & 0xff; } #define LDT_entry_a(info) \ ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff)) /* Don't allow setting of the lm bit. It is useless anyways because 64bit system calls require __USER_CS. */ #define LDT_entry_b(info) \ (((info)->base_addr & 0xff000000) | \ (((info)->base_addr & 0x00ff0000) >> 16) | \ ((info)->limit & 0xf0000) | \ (((info)->read_exec_only ^ 1) << 9) | \ ((info)->contents << 10) | \ (((info)->seg_not_present ^ 1) << 15) | \ ((info)->seg_32bit << 22) | \ ((info)->limit_in_pages << 23) | \ ((info)->useable << 20) | \ /* ((info)->lm << 21) | */ \ 0x7000) #define LDT_empty(info) (\ (info)->base_addr == 0 && \ (info)->limit == 0 && \ (info)->contents == 0 && \ (info)->read_exec_only == 1 && \ (info)->seg_32bit == 0 && \ (info)->limit_in_pages == 0 && \ (info)->seg_not_present == 1 && \ (info)->useable == 0 && \ (info)->lm == 0) #if TLS_SIZE != 24 # error update this code. #endif static inline void load_TLS(struct thread_struct *t, unsigned int cpu) { u64 *gdt = (u64 *)(cpu_gdt(cpu) + GDT_ENTRY_TLS_MIN); gdt[0] = t->tls_array[0]; gdt[1] = t->tls_array[1]; gdt[2] = t->tls_array[2]; } /* * load one particular LDT into the current CPU */ static inline void load_LDT_nolock (mm_context_t *pc, int cpu) { int count = pc->size; if (likely(!count)) { clear_LDT(); return; } set_ldt_desc(cpu, pc->ldt, count); load_LDT_desc(); } static inline void load_LDT(mm_context_t *pc) { int cpu = get_cpu(); load_LDT_nolock(pc, cpu); put_cpu(); } extern struct desc_ptr idt_descr; #endif /* !__ASSEMBLY__ */ #endif