From 1aac36f788834699b6891aea7a83eb950bd5e8f6 Mon Sep 17 00:00:00 2001
From: stefan <stefan@s00.xyz>
Date: Sat, 8 Apr 2023 20:42:18 -0400
Subject: no idea whot i changed lol

---
 sys/include/asm.h      | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++
 sys/include/cpu.h      | 10 +++++++++
 sys/include/fdt.h      | 18 +++++++++++++++++
 sys/include/smp.h      |  0
 sys/include/spinlock.h | 11 ++++++++++
 5 files changed, 94 insertions(+)
 create mode 100644 sys/include/asm.h
 create mode 100644 sys/include/cpu.h
 create mode 100644 sys/include/smp.h
 create mode 100644 sys/include/spinlock.h

(limited to 'sys/include')

diff --git a/sys/include/asm.h b/sys/include/asm.h
new file mode 100644
index 0000000..86e6354
--- /dev/null
+++ b/sys/include/asm.h
@@ -0,0 +1,55 @@
+#ifndef _ASM_H 
+#define _ASM_H 
+
+#include <stdint.h>
+
+#define SSTATUS_SIE      (1L << 1)
+
+static inline uint64_t 
+csrr_sstatus(void) 
+{
+        uint64_t x;
+        asm volatile("csrr %0, sstatus" : "=r"(x));
+        return x;
+}
+
+static inline void 
+csrw_sstatus(uint64_t x) 
+{
+        asm volatile("csrw sstatus, %0" : : "r"(x));
+}
+
+/* will enable all supervisor interrupts using the bit in sstatus */
+static inline void 
+sie_enable(void) 
+{
+        csrw_sstatus(csrr_sstatus() | SSTATUS_SIE);
+}
+
+/* will disable all supervisor interrupts by using the bitin sstatus (though sie can also be used) */
+static inline void 
+sie_disable(void) 
+{
+        csrw_sstatus(csrr_sstatus() & ~SSTATUS_SIE);
+}
+
+/* returns the status of the sie bit in sstatus 
+ * 1 if enabled, 0 if disabled.
+ * for more specific info see the sie register 
+ */
+static inline uint64_t
+sie_status() 
+{
+        return (csrr_sstatus() & SSTATUS_SIE) != 0;
+        
+}
+
+/* we use tp to store hartid */ 
+static inline uint64_t 
+read_tp(void) 
+{
+        uint64_t x;
+        asm volatile("addi %0, tp, 0" : "=r"(x));
+}
+
+#endif /* _ASM_H */ 
diff --git a/sys/include/cpu.h b/sys/include/cpu.h
new file mode 100644
index 0000000..9567496
--- /dev/null
+++ b/sys/include/cpu.h
@@ -0,0 +1,10 @@
+#ifndef _CPU_H 
+#define _CPU_H 
+
+struct hart {
+        int intr_stack;
+};
+
+struct hart harts[NPROC] = {0};
+
+#endif /* _CPU_H */
diff --git a/sys/include/fdt.h b/sys/include/fdt.h
index 92e5695..ca1cea0 100644
--- a/sys/include/fdt.h
+++ b/sys/include/fdt.h
@@ -1,5 +1,6 @@
 #include <stdint.h>
 #include <endian.h>
+#include <printf.h>
 
 #ifndef _FDT_H
 #define _FDT_H
@@ -34,4 +35,21 @@ struct fdt_reserve_entry {
         uint64_t size;
 };
 
+struct fdt_node_header {
+	uint32_t tag;
+	char name[];
+};
+
+void    walk_fdt(struct fdt_header *header);
+
+#define FDT_MAGIC	0xd00dfeed	/* 4: version, 4: total size */
+#define FDT_TAGSIZE	sizeof(fdt32_t)
+
+#define FDT_BEGIN_NODE	0x1		/* Start node: full name */
+#define FDT_END_NODE	0x2		/* End node */
+#define FDT_PROP	0x3		/* Property: name off,
+					   size, content */
+#define FDT_NOP		0x4		/* nop */
+#define FDT_END		0x9
+
 #endif /* _FDT_H */
diff --git a/sys/include/smp.h b/sys/include/smp.h
new file mode 100644
index 0000000..e69de29
diff --git a/sys/include/spinlock.h b/sys/include/spinlock.h
new file mode 100644
index 0000000..3400445
--- /dev/null
+++ b/sys/include/spinlock.h
@@ -0,0 +1,11 @@
+#ifndef _LOCK_H
+#define _LOCK_H
+
+struct spinlock {
+        int locked;
+        const char *name;
+};
+
+void initlock(struct spinlock *, const char *);
+
+#endif /* _LOCK_H */
-- 
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