reorganize source

[com32] / src / kern / intr.h

diff --git a/src/kern/intr.h b/src/kern/intr.h
new file mode 100644 (file)
index 0000000..3cfbe8b
--- /dev/null
+++ b/src/kern/intr.h
@@ -0,0 +1,90 @@
+/*
+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 INTR_H_
+#define INTR_H_
+
+#include <inttypes.h>
+#include "asmops.h"
+
+/* offset used to remap IRQ numbers (+32) */
+#define IRQ_OFFSET             32
+/* conversion macros between IRQ and interrupt numbers */
+#define IRQ_TO_INTR(x) ((x) + IRQ_OFFSET)
+#define INTR_TO_IRQ(x) ((x) - IRQ_OFFSET)
+/* checks whether a particular interrupt is an remapped IRQ */
+#define IS_IRQ(n)      ((n) >= IRQ_OFFSET && (n) < IRQ_OFFSET + 16)
+
+/* general purpose registers as they are pushed by pusha */
+struct registers {
+       uint32_t edi, esi, ebp, esp;
+       uint32_t ebx, edx, ecx, eax;
+} __attribute__ ((packed));
+
+/* structure used to pass the interrupt stack frame from the
+ * entry points to the C dispatch function.
+ */
+struct intr_frame {
+       /* registers pushed by pusha in intr_entry_* */
+       struct registers regs;
+       /* data segment selectors */
+       /* XXX removed: not needed unless we do dpl3 transitions
+       uint32_t ds, es, fs, gs;
+       */
+       /* interrupt number and error code pushed in intr_entry_* */
+       uint32_t inum, err;
+       /* pushed by CPU during interrupt entry */
+       uint32_t eip, cs, eflags;
+       /* pushed by CPU during interrupt entry from user space */
+       /* XXX removed: again, not doing user space currently
+       uint32_t esp, ss;
+       */
+} __attribute__ ((packed));
+
+
+
+typedef void (*intr_func_t)(int);
+
+
+void init_intr(void);
+void cleanup_intr(void);
+
+struct intr_frame *get_intr_frame(void);
+
+/* install high level interrupt callback */
+void interrupt(int intr_num, intr_func_t func);
+
+/* install low-level interrupt vector in IDT
+ * must be able to handle EOI and return with iret
+ */
+void set_intr_entry(int num, void (*handler)(void));
+
+void prog_pic(int offs);
+void set_pic_mask(int pic, unsigned char mask);
+unsigned char get_pic_mask(int pic);
+void mask_irq(int irq);
+void unmask_irq(int irq);
+
+/* defined in intr_asm.S */
+int get_intr_flag(void);
+void set_intr_flag(int onoff);
+
+void intr_ret(struct intr_frame ifrm);
+
+void end_of_irq(int irq);
+
+#endif /* INTR_H_ */