From d963772c6633a0610898aaba2ae90d461e8f2de8 Mon Sep 17 00:00:00 2001 From: nishi Date: Fri, 7 Jul 2023 23:40:27 +0000 Subject: should be working, should be git-svn-id: https://svn.vegaa.systems/svn/vega-Vega/trunk@7 a8a8aea2-181d-ee11-89e8-15fd0e089fc4 --- sys/include/arch/amd64/idt.h | 72 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 sys/include/arch/amd64/idt.h (limited to 'sys/include/arch/amd64/idt.h') diff --git a/sys/include/arch/amd64/idt.h b/sys/include/arch/amd64/idt.h new file mode 100644 index 0000000..d3b623d --- /dev/null +++ b/sys/include/arch/amd64/idt.h @@ -0,0 +1,72 @@ +/* + * Copyright (c) 2023 Ian Marco Moffett and the VegaOS team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of VegaOS nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* $Id$ */ + +#ifndef _AMD64_IDT_H_ +#define _AMD64_IDT_H_ + +#include +#include + +#define LIDT(idtr) __ASMV("lidt %0" \ + :: "m" (idtr)) + +#define IDT_TRAP_GATE_FLAGS 0x8F +#define IDT_INT_GATE_FLAGS 0x8E +#define IDT_INT_GATE_USER 0xEE + +/* + * AMD64 Interrupt Gate Descriptor. + */ +struct idt_entry { + uint16_t off_lo; /* Low 16 bits of ISR offset */ + uint16_t segsel; /* Segment selector, hardcode to kernel CS */ + uint8_t ist : 2; /* Interrupt stack table */ + uint8_t zero : 1; /* Unused: keep zero */ + uint8_t zero1 : 4; /* Unused: keep zero */ + uint8_t type : 4; /* Gate type */ + uint8_t zero2 : 1; /* Unused: keep zero */ + uint8_t dpl : 2; /* Descriptor privilege level */ + uint8_t p : 1; /* Present (keep 1 to mark as valid) */ + uint16_t off_mid; /* Middle 16 bits of ISR offset */ + uint32_t off_hi; /* High 32-bits of ISR offset */ + uint32_t reserved; /* Reserved: keep zero */ +}; + +struct __packed idtr { + uint16_t limit; + uintptr_t offset; +}; + + +void idt_set_desc(uint8_t vec, uint8_t type, uintptr_t isr, uint8_t ist); +void idt_load(void); + +#endif /* !_AMD64_IDT_H_ */ -- cgit v1.2.3