reorganize source

[com32] / src / kern / asmops.h

diff --git a/src/kern/asmops.h b/src/kern/asmops.h
new file mode 100644 (file)
index 0000000..5d8ec31
--- /dev/null
+++ b/src/kern/asmops.h
@@ -0,0 +1,85 @@
+/*
+pcboot - bootable PC demo/game kernel
+Copyright (C) 2018-2023  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_
+
+#include <inttypes.h>
+
+#define enable_intr() asm volatile("sti")
+#define disable_intr() asm volatile("cli")
+#define halt_cpu() asm volatile("hlt")
+
+#define CALLER_EIP(eip) \
+       asm volatile( \
+               "mov 4(%%ebp), %0\n\t" \
+               : "=a" ((uint32_t)eip))
+
+static inline uint8_t inp(uint16_t port)
+{
+       uint8_t res;
+       asm volatile (
+               "inb %1, %0\n\t"
+               : "=a" (res)
+               : "dN" (port));
+       return res;
+}
+
+static inline uint16_t inpw(uint16_t port)
+{
+       uint16_t res;
+       asm volatile (
+               "inw %1, %0\n\t"
+               : "=a" (res)
+               : "dN" (port));
+       return res;
+}
+
+static inline uint32_t inpd(uint16_t port)
+{
+       uint32_t res;
+       asm volatile (
+               "inl %1, %0\n\t"
+               : "=a" (res)
+               : "dN" (port));
+       return res;
+}
+
+#define outp(port, src) \
+       asm volatile( \
+               "outb %0, %1\n\t" \
+               :: "a" ((uint8_t)(src)), "dN" ((uint16_t)(port)))
+
+#define outpw(port, src) \
+       asm volatile( \
+               "outw %0, %1\n\t" \
+               :: "a" ((uint16_t)(src)), "dN" ((uint16_t)(port)))
+
+#define outpd(port, src) \
+       asm volatile( \
+               "outl %0, %1\n\t" \
+               :: "a" ((uint32_t)(src)), "dN" ((uint16_t)(port)))
+
+/* delay for about 1us */
+#define iodelay() outp(0x80, 0)
+
+#define get_ebp(ebp) \
+       asm volatile( \
+               "mov %%ebp, %0\n\t" \
+               : "=g"((uint32_t)(ebp)))
+
+#endif /* ASMOPS_H_ */