idt: reformat code
This commit is contained in:
Mathieu Maret
parent
c62f52342f
commit
6d34b7eef0
66
idt.c
66
idt.c
@ -1,45 +1,44 @@
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#include "idt.h"
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static struct idtEntry idt[IDT_NUM];
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static struct idtEntry idt[IDT_NUM];
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int idtSetup()
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{
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struct idtRegister idtr;
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struct idtRegister idtr;
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for (int i = 0; i < IDT_NUM; i++) {
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struct idtEntry *idte = idt + i;
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for (int i = 0; i < IDT_NUM; i++) {
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struct idtEntry *idte = idt + i;
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/* Setup an empty IDTE interrupt gate, see figure 5-2 in Intel
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x86 doc, vol 3 */
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idte->seg_sel = BUILD_SEGMENT_SELECTOR(RING_0, 0, SEGMENT_IDX_CODE);
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idte->reserved = 0;
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idte->flags = 0;
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idte->type = 0x6; /* Interrupt gate (110b) */
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idte->op_size = 1; /* 32bits instructions */
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/* Setup an empty IDTE interrupt gate, see figure 5-2 in Intel
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x86 doc, vol 3 */
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idte->seg_sel = BUILD_SEGMENT_SELECTOR(RING_0, 0, SEGMENT_IDX_CODE);
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idte->reserved = 0;
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idte->flags = 0;
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idte->type = 0x6; /* Interrupt gate (110b) */
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idte->op_size = 1; /* 32bits instructions */
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/* Disabled it for now */
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idte->zero = 0;
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idte->offset_low = 0;
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idte->offset_high = 0;
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idte->dpl = 0;
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idte->present = 0;
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}
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/* Disabled it for now */
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idte->zero = 0;
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idte->offset_low = 0;
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idte->offset_high = 0;
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idte->dpl = 0;
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idte->present = 0;
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}
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/*
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* Setup the IDT register, see Intel x86 doc vol 3, section 5.8.
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*/
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/*
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* Setup the IDT register, see Intel x86 doc vol 3, section 5.8.
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*/
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/* Address of the IDT */
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idtr.base_addr = (uint32_t) idt;
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/* Address of the IDT */
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idtr.base_addr = (uint32_t)idt;
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/* The limit is the maximum offset in bytes from the base address of
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the IDT */
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idtr.limit = sizeof(idt) - 1;
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/* The limit is the maximum offset in bytes from the base address of
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the IDT */
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idtr.limit = sizeof(idt) - 1;
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/* Commit the IDT into the CPU */
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asm volatile ("lidt %0\n"::"m"(idtr):"memory");
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/* Commit the IDT into the CPU */
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asm volatile("lidt %0\n" ::"m"(idtr) : "memory");
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return 0;
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return 0;
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}
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int idt_set_handler(int index, unsigned int addr, int priviledge)
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@ -51,13 +50,18 @@ int idt_set_handler(int index, unsigned int addr, int priviledge)
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if ((priviledge < 0) || priviledge > 3)
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return -1;
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idte = &idt[index];
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idte = idt + index;
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if (addr != (unsigned int)NULL) {
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idte->offset_low = addr && 0xffff;
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idte->offset_high = (addr >> 16) && 0xffff;
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idte->dpl = priviledge;
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idte->present = 1;
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} else {
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idte->offset_low = 0;
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idte->offset_high = 0;
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idte->dpl = 0;
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idte->present = 0;
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}
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return 0;
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59
segment.h
Normal file
59
segment.h
Normal file
@ -0,0 +1,59 @@
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/* Copyright (C) 2004 The SOS Team
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Copyright (C) 1999 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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USA.
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*/
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#ifndef _SOS_HWSEGS_H_
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#define _SOS_HWSEGS_H_
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/**
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* @file segments.h
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*
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* Global and local (GDT/LDT) segment descriptor definition and
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* structure. These segments map virtual addresses (ie
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* data/instruction addresses, relative to these segment descriptors)
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* to linear addresses (ie addresses in the paged-memory space).
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*
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* @see Intel x86 doc, vol 3 chapter 3.
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*/
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#include "types.h"
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/*
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* Global segment selectors (GDT) for SOS/x86.
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*
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* @see gdt.h
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*/
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#define SOS_SEG_NULL 0 /* NULL segment, unused by the procesor */
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#define SOS_SEG_KCODE 1 /* Kernel code segment */
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#define SOS_SEG_KDATA 2 /* Kernel data segment */
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/**
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* Helper macro that builds a segment register's value
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*/
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#define SOS_BUILD_SEGMENT_REG_VALUE(desc_privilege,in_ldt,seg_index) \
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( (((desc_privilege) & 0x3) << 0) \
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| (((in_ldt)?1:0) << 2) \
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| ((seg_index) << 3) )
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/*
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* Local segment selectors (LDT) for SOS/x86
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*/
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/* None */
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#endif /* _SOS_HWSEGS_H_ */
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