From 9b22a6965579ea1867aea291d910c96f386b518b Mon Sep 17 00:00:00 2001
From: Brett Weiland <brett_weiland@bpcspace.com>
Date: Tue, 24 Aug 2021 14:09:29 -0500
Subject: major backup 8.24.21

---
 src/include/int.h | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 src/include/int.h

(limited to 'src/include/int.h')

diff --git a/src/include/int.h b/src/include/int.h
new file mode 100644
index 0000000..8cc6a88
--- /dev/null
+++ b/src/include/int.h
@@ -0,0 +1,84 @@
+#ifndef int_header
+#define int_header
+
+#include <stdint.h>
+#include <stddef.h>
+
+
+
+void usleep(unsigned int us);
+void init_interrupts();
+
+typedef uint32_t *lapic_t;
+
+//this is only for madt; do we really need it here?
+struct ioapic_t {
+  void *address;
+  unsigned int gsi_base;
+  unsigned int gsi_count;
+};
+
+//future: if we start to do things like this more then once,
+struct ioapic_fixedlen {
+  size_t count;
+  struct ioapic_t *ioapic;
+};
+
+//TODO change name
+struct apic_vt {
+  uint8_t vector;
+  unsigned int delivery_mode:3;
+  unsigned int dest_mode:1;
+  unsigned int delivery_status:1;
+  unsigned int polarity:1; //0 = high, 1 = low.
+  unsigned int remote_irr:1;
+  unsigned int trigger_mode:1;
+  unsigned int mask:1;
+  unsigned long int reserved:40;
+  unsigned int destination:7;
+} __attribute__((packed));
+
+
+//simplified idt_descriptor makes things easier
+struct idt_entry {
+  void *addr;
+  unsigned int ist:3;
+  unsigned int type:4;
+  unsigned int priv:2;
+};
+
+#define IOAPIC_REDIRECT_FIXED(vector, destination) \
+  ((struct apic_vt) { \
+   .vector = vector,			    \
+   .delivery_mode = 0,			  \
+   .dest_mode = 0,			      \
+   .polarity = 0,			        \
+   .remote_irr = 0,			      \
+   .trigger_mode = 0,			    \
+   .mask = 0,			            \
+   .destination = destination \
+})
+
+#define KERNEL_IDT_GATE(isr) \
+  ((struct idt_entry) {         \
+   .addr = isr,                \
+   .ist = 0,                    \
+   .type = INT_GATE_64,         \
+   .priv = 0                    \
+})
+
+#define TASK_GATE_64  0x5
+#define INT_GATE_64   0xe
+#define TRAP_GATE_64  0xf
+
+#define SPURRIOUS_VECTOR 255
+
+
+void create_fixed_interrupt(unsigned int irq, struct apic_vt *redirect);
+void clear_int();
+unsigned int alloc_idt(struct idt_entry *entry);
+void free_idt(unsigned int entry);
+void modify_idt(struct idt_entry *entry, unsigned int vector);
+
+
+#endif
-- 
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