cc6978528c
This patch makes get_desc_base() receive a struct desc_struct, and then uses its internal fields to compute the base address. This is done at both i386 and x86_64, and then it is moved to common header Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
#ifndef _ASM_DESC_H_
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#define _ASM_DESC_H_
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#ifndef __ASSEMBLY__
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#include <asm/desc_defs.h>
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#include <asm/ldt.h>
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#include <asm/mmu.h>
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static inline void fill_ldt(struct desc_struct *desc, struct user_desc *info)
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{
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desc->limit0 = info->limit & 0x0ffff;
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desc->base0 = info->base_addr & 0x0000ffff;
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desc->base1 = (info->base_addr & 0x00ff0000) >> 16;
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desc->type = (info->read_exec_only ^ 1) << 1;
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desc->type |= info->contents << 2;
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desc->s = 1;
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desc->dpl = 0x3;
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desc->p = info->seg_not_present ^ 1;
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desc->limit = (info->limit & 0xf0000) >> 16;
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desc->avl = info->useable;
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desc->d = info->seg_32bit;
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desc->g = info->limit_in_pages;
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desc->base2 = (info->base_addr & 0xff000000) >> 24;
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}
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extern struct desc_ptr idt_descr;
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extern gate_desc idt_table[];
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#ifdef CONFIG_X86_32
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# include "desc_32.h"
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#else
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# include "desc_64.h"
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#endif
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#define _LDT_empty(info) (\
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(info)->base_addr == 0 && \
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(info)->limit == 0 && \
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(info)->contents == 0 && \
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(info)->read_exec_only == 1 && \
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(info)->seg_32bit == 0 && \
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(info)->limit_in_pages == 0 && \
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(info)->seg_not_present == 1 && \
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(info)->useable == 0)
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#ifdef CONFIG_X86_64
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#define LDT_empty(info) (_LDT_empty(info) && ((info)->lm == 0))
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#else
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#define LDT_empty(info) (_LDT_empty(info))
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#endif
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static inline void clear_LDT(void)
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{
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set_ldt(NULL, 0);
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}
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/*
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* load one particular LDT into the current CPU
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*/
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static inline void load_LDT_nolock(mm_context_t *pc)
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{
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set_ldt(pc->ldt, pc->size);
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}
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static inline void load_LDT(mm_context_t *pc)
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{
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preempt_disable();
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load_LDT_nolock(pc);
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preempt_enable();
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}
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static inline unsigned long get_desc_base(struct desc_struct *desc)
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{
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return desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24);
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}
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#else
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/*
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* GET_DESC_BASE reads the descriptor base of the specified segment.
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*
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* Args:
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* idx - descriptor index
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* gdt - GDT pointer
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* base - 32bit register to which the base will be written
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* lo_w - lo word of the "base" register
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* lo_b - lo byte of the "base" register
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* hi_b - hi byte of the low word of the "base" register
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*
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* Example:
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* GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah)
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* Will read the base address of GDT_ENTRY_ESPFIX_SS and put it into %eax.
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*/
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#define GET_DESC_BASE(idx, gdt, base, lo_w, lo_b, hi_b) \
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movb idx*8+4(gdt), lo_b; \
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movb idx*8+7(gdt), hi_b; \
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shll $16, base; \
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movw idx*8+2(gdt), lo_w;
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#endif /* __ASSEMBLY__ */
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#endif
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