X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-x86%2Fdesc_64.h;h=8b137891791fe96927ad78e64b0aad7bded08bdc;hb=5280e004fc22314122c84978c0b6a741cf96dc0f;hp=ba7fb87d10f3bea13a32a90f2bd727c8cf9ea1ac;hpb=80fbb69a8d1268ef48dfe21da80e68cb01922f31;p=linux-2.6-omap-h63xx.git diff --git a/include/asm-x86/desc_64.h b/include/asm-x86/desc_64.h index ba7fb87d10f..8b137891791 100644 --- a/include/asm-x86/desc_64.h +++ b/include/asm-x86/desc_64.h @@ -1,208 +1 @@ -/* Written 2000 by Andi Kleen */ -#ifndef __ARCH_DESC_H -#define __ARCH_DESC_H -#include -#include - -#ifndef __ASSEMBLY__ - -#include -#include -#include - -#include -#include - -extern struct desc_struct cpu_gdt_table[GDT_ENTRIES]; - -#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)) - -static inline unsigned long __store_tr(void) -{ - unsigned long tr; - - asm volatile ("str %w0":"=r" (tr)); - return tr; -} - -#define store_tr(tr) (tr) = __store_tr() - -extern gate_desc idt_table[]; -extern struct desc_ptr cpu_gdt_descr[]; - -static inline void write_ldt_entry(struct desc_struct *ldt, - int entry, u32 entry_low, u32 entry_high) -{ - __u32 *lp = (__u32 *)((entry << 3) + (char *)ldt); - - lp[0] = entry_low; - lp[1] = entry_high; -} - -/* the cpu gdt accessor */ -#define get_cpu_gdt_table(x) ((struct desc_struct *)cpu_gdt_descr[x].address) - -static inline void load_gdt(const struct desc_ptr *ptr) -{ - asm volatile("lgdt %w0"::"m" (*ptr)); -} - -static inline void store_gdt(struct desc_ptr *ptr) -{ - asm("sgdt %w0":"=m" (*ptr)); -} - -static inline void _set_gate(void *adr, unsigned type, unsigned long func, - unsigned dpl, unsigned ist) -{ - gate_desc 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 load_idt(const struct desc_ptr *ptr) -{ - asm volatile("lidt %w0"::"m" (*ptr)); -} - -static inline void store_idt(struct desc_ptr *dtr) -{ - asm("sidt %w0":"=m" (*dtr)); -} - -static inline void set_tssldt_descriptor(void *ptr, unsigned long tss, - unsigned type, unsigned size) -{ - struct ldttss_desc64 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(&get_cpu_gdt_table(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(&get_cpu_gdt_table(cpu)[GDT_ENTRY_LDT], - (unsigned long)addr, DESC_LDT, size * 8 - 1); -} - -#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) - -static inline void load_TLS(struct thread_struct *t, unsigned int cpu) -{ - unsigned int i; - u64 *gdt = (u64 *)(get_cpu_gdt_table(cpu) + GDT_ENTRY_TLS_MIN); - - for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++) - gdt[i] = t->tls_array[i]; -} - -/* - * 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; - -static inline unsigned long get_desc_base(const void *ptr) -{ - const u32 *desc = ptr; - unsigned long base; - base = ((desc[0] >> 16) & 0x0000ffff) | - ((desc[1] << 16) & 0x00ff0000) | - (desc[1] & 0xff000000); - return base; -} - -#endif /* !__ASSEMBLY__ */ - -#endif