89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
/* 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) 2011-2018 K. Lange
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*
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* System Functions
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*
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*/
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#include <kernel/system.h>
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char * boot_arg = NULL;
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char * boot_arg_extra = NULL;
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/*
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* memsetw
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* Set `count` shorts to `val`.
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*/
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unsigned short * memsetw(unsigned short * dest, unsigned short val, int count) {
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int i = 0;
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for ( ; i < count; ++i ) {
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dest[i] = val;
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}
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return dest;
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}
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uint32_t __attribute__ ((pure)) krand(void) {
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static uint32_t x = 123456789;
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static uint32_t y = 362436069;
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static uint32_t z = 521288629;
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static uint32_t w = 88675123;
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uint32_t t;
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t = x ^ (x << 11);
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x = y; y = z; z = w;
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return w = w ^ (w >> 19) ^ t ^ (t >> 8);
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}
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unsigned short inports(unsigned short _port) {
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unsigned short rv;
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asm volatile ("inw %1, %0" : "=a" (rv) : "dN" (_port));
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return rv;
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}
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void outports(unsigned short _port, unsigned short _data) {
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asm volatile ("outw %1, %0" : : "dN" (_port), "a" (_data));
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}
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unsigned int inportl(unsigned short _port) {
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unsigned int rv;
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asm volatile ("inl %%dx, %%eax" : "=a" (rv) : "dN" (_port));
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return rv;
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}
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void outportl(unsigned short _port, unsigned int _data) {
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asm volatile ("outl %%eax, %%dx" : : "dN" (_port), "a" (_data));
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}
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unsigned char inportb(unsigned short _port) {
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unsigned char rv;
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asm volatile ("inb %1, %0" : "=a" (rv) : "dN" (_port));
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return rv;
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}
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void outportb(unsigned short _port, unsigned char _data) {
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asm volatile ("outb %1, %0" : : "dN" (_port), "a" (_data));
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}
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void outportsm(unsigned short port, unsigned char * data, unsigned long size) {
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asm volatile ("rep outsw" : "+S" (data), "+c" (size) : "d" (port));
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}
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void inportsm(unsigned short port, unsigned char * data, unsigned long size) {
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asm volatile ("rep insw" : "+D" (data), "+c" (size) : "d" (port) : "memory");
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}
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size_t lfind(const char * str, const char accept) {
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return (size_t)strchr(str, accept);
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}
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size_t rfind(const char * str, const char accept) {
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return (size_t)strrchr(str, accept);
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}
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uint8_t startswith(const char * str, const char * accept) {
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return strstr(str, accept) == str;
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}
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