85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
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/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2018 K. Lange
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*
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* provides /dev/port
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*
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*/
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#include <kernel/system.h>
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#include <kernel/fs.h>
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#include <kernel/module.h>
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static uint32_t read_port(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
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switch (size) {
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case 1:
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buffer[0] = inportb(offset);
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break;
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case 2:
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((uint16_t *)buffer)[0] = inports(offset);
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break;
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case 4:
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((uint32_t *)buffer)[0] = inportl(offset);
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break;
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default:
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for (unsigned int i = 0; i < size; ++i) {
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buffer[i] = inportb(offset + i);
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}
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break;
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}
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return size;
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}
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static uint32_t write_port(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
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switch (size) {
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case 1:
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outportb(offset, buffer[0]);
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break;
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case 2:
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outports(offset, ((uint16_t*)buffer)[0]);
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break;
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case 4:
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outportl(offset, ((uint32_t*)buffer)[0]);
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break;
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default:
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for (unsigned int i = 0; i < size; ++i) {
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outportb(offset +i, buffer[i]);
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}
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break;
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}
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return size;
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}
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static fs_node_t * port_device_create(void) {
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fs_node_t * fnode = malloc(sizeof(fs_node_t));
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memset(fnode, 0x00, sizeof(fs_node_t));
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fnode->inode = 0;
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strcpy(fnode->name, "port");
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fnode->uid = 0;
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fnode->gid = 0;
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fnode->mask = 0660;
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fnode->flags = FS_CHARDEVICE;
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fnode->read = read_port;
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fnode->write = write_port;
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fnode->open = NULL;
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fnode->close = NULL;
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fnode->readdir = NULL;
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fnode->finddir = NULL;
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fnode->ioctl = NULL;
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return fnode;
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}
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static int port_initialize(void) {
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vfs_mount("/dev/port", port_device_create());
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return 0;
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}
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static int port_finalize(void) {
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return 0;
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}
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MODULE_DEF(portio, port_initialize, port_finalize);
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