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jamieiles |
// Copyright Jamie Iles, 2017
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//
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// This file is part of s80x86.
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//
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// s80x86 is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// s80x86 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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//
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// You should have received a copy of the GNU General Public License
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// along with s80x86. If not, see <http://www.gnu.org/licenses/>.
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#pragma once
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#include "bda.h"
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#define __unused __attribute__((unused))
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/* Pushed by the INT handlers in the order that a PUSHA would. */
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union reg {
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struct {
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unsigned char l;
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unsigned char h;
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};
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unsigned short x;
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};
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struct callregs {
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union reg di;
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union reg si;
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union reg bp;
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union reg sp;
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union reg bx;
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union reg dx;
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union reg cx;
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union reg ax;
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unsigned short ds;
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unsigned short flags;
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};
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enum FlagBitPos {
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CF_OFFS = 0,
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PF_OFFS = 2,
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AF_OFFS = 4,
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ZF_OFFS = 6,
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SF_OFFS = 7,
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TF_OFFS = 8,
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IF_OFFS = 9,
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DF_OFFS = 10,
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OF_OFFS = 11
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};
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enum Flag {
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CF = (1 << CF_OFFS),
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PF = (1 << PF_OFFS),
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AF = (1 << AF_OFFS),
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ZF = (1 << ZF_OFFS),
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SF = (1 << SF_OFFS),
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TF = (1 << TF_OFFS),
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IF = (1 << IF_OFFS),
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DF = (1 << DF_OFFS),
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OF = (1 << OF_OFFS),
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};
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#define VECTOR(vnum, handler) \
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static void __attribute__((used)) handler(struct callregs *); \
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asm(".pushsection .text, \"ax\"\n" \
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"1:\n" \
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"cli\n" \
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"push $" #handler \
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"\n" \
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"jmp irq_entry\n" \
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".pushsection .rodata.vectors\n" \
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".align 4\n" \
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".word " #vnum \
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"\n" \
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".word 1b\n" \
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".popsection")
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#define bda_write(field, val) \
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({ \
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typeof(((struct bios_data_area *)0)->field) _p = (val); \
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if (__builtin_types_compatible_p(typeof(_p), unsigned short)) \
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writew(0x40, offsetof(struct bios_data_area, field), _p); \
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else if (__builtin_types_compatible_p(typeof(_p), unsigned char)) \
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writeb(0x40, offsetof(struct bios_data_area, field), _p); \
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else \
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memcpy_seg(0x40, (void *)offsetof(struct bios_data_area, field), \
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get_cs(), &_p, sizeof(_p)); \
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})
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#define bda_read(field) \
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({ \
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typeof(((struct bios_data_area *)0)->field) _p; \
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if (__builtin_types_compatible_p(typeof(_p), unsigned short)) \
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_p = readw(0x40, offsetof(struct bios_data_area, field)); \
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else if (__builtin_types_compatible_p(typeof(_p), unsigned char)) \
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_p = readb(0x40, offsetof(struct bios_data_area, field)); \
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else \
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memcpy_seg(get_cs(), &_p, 0x40, \
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(void *)offsetof(struct bios_data_area, field), \
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sizeof(_p)); \
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_p; \
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})
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#define offsetof __builtin_offsetof
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#define noinline __attribute__((noinline))
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void irq_enable(int irq_num);
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void irq_ack(void);
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void printk(const char *fmt, ...);
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#define ARRAY_SIZE(__a) (sizeof(__a) / sizeof(__a[0]))
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