Working i386 paging and liballoc

kernel/platform/i386_pc/sys/ioport.c

@@ -0,0 +1,85 @@
+/*
+Copyright 2025 Kamil Kowalczyk
+
+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 the copyright holder 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
+HOLDER 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.
+*/
+
+#include <libk/types.h>
+#include <sys/ioport.h>
+
+uint8_t ioport_in8(uint16_t port) {
+  uint8_t r;
+  __asm__ volatile("inb %1, %0" : "=a"(r) : "dN"(port));
+  return r;
+}
+
+void ioport_out8(uint16_t port, uint8_t value) {
+  __asm__ volatile("outb %1, %0" :: "dN"(port), "a"(value));
+}
+
+uint16_t ioport_in16(uint16_t port) {
+  uint16_t r;
+  __asm__ volatile("in %%dx, %%ax" : "=a"(r) : "d"(port));
+  return r;
+}
+
+void ioport_out16(uint16_t port, uint16_t value) {
+  __asm__ volatile("out %%ax, %%dx" :: "a"(value), "d"(port));
+}
+
+uint32_t ioport_in32(uint16_t port) {
+  uint32_t r;
+  __asm__ volatile("inl %%dx, %%eax" : "=a"(r) : "d"(port));
+  return r;
+}
+
+void ioport_out32(uint16_t port, uint32_t value) {
+  __asm__ volatile("outl %%eax, %%dx" :: "d"(port), "a"(value));
+}
+
+void ioport_ins16(uint16_t port, void *addr, int cnt) {
+  __asm__ volatile(
+    "cld; rep insw"
+    : "+D"(addr), "+c"(cnt)
+    : "d"(port)
+    : "memory", "cc"
+  );
+}
+
+void ioport_outs16(uint16_t port, const void *addr, int cnt) {
+  __asm__ volatile(
+    "cld; rep outsw"
+    : "+S"(addr), "+c"(cnt)
+    : "d"(port)
+    : "memory", "cc"
+  );
+}
+
+void ioport_wait(void) {
+  ioport_out8(0x80, 0);
+}