+/*
+pcboot - bootable PC demo/game kernel
+Copyright (C) 2018 John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY, without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+*/
#ifndef ASMOPS_H_
#define ASMOPS_H_
#define disable_intr() asm volatile("cli")
#define halt_cpu() asm volatile("hlt")
+#define CALLER_EIP(eip) \
+ asm volatile( \
+ "mov (%%esp), %0\n\t" \
+ : "=a" ((uint32_t)eip))
+
static inline uint8_t inb(uint16_t port)
{
uint8_t res;
"outl %0, %1\n\t" \
:: "a" ((uint32_t)(src)), "dN" ((uint16_t)(port)))
+/* delay for about 1us */
#define iodelay() outb(0, 0x80)