Revert to good ol' paging

1 files changed, 80 insertions, 0 deletions

diff --git a/src/kernel/syscall.h b/src/kernel/syscall.h
new file mode 100644
index 0000000..2d79458
--- /dev/null
+++ b/src/kernel/syscall.h
@@ -0,0 +1,80 @@
+#ifndef MELVIX_SYSCALL_H
+#define MELVIX_SYSCALL_H
+
+#include <stdint.h>
+
+#define DECL_SYSCALL0(fn) int syscall_##fn();
+#define DECL_SYSCALL1(fn, p1) int syscall_##fn(p1);
+#define DECL_SYSCALL2(fn, p1, p2) int syscall_##fn(p1,p2);
+#define DECL_SYSCALL3(fn, p1, p2, p3) int syscall_##fn(p1,p2,p3);
+#define DECL_SYSCALL4(fn, p1, p2, p3, p4) int syscall_##fn(p1,p2,p3,p4);
+#define DECL_SYSCALL5(fn, p1, p2, p3, p4, p5) int syscall_##fn(p1,p2,p3,p4,p5);
+
+#define DEFN_SYSCALL0(fn, num) \
+int syscall_##fn() \
+{ \
+  int a; \
+  asm volatile("int $0x80" : "=a" (a) : "0" (num)); \
+  return a; \
+}
+
+#define DEFN_SYSCALL1(fn, num, P1) \
+int syscall_##fn(P1 p1) \
+{ \
+  int a; \
+  asm volatile("int $0x80" : "=a" (a) : "0" (num), "b" ((int)p1)); \
+  return a; \
+}
+
+#define DEFN_SYSCALL2(fn, num, P1, P2) \
+int syscall_##fn(P1 p1, P2 p2) \
+{ \
+  int a; \
+  asm volatile("int $0x80" : "=a" (a) : "0" (num), "b" ((int)p1), "c" ((int)p2)); \
+  return a; \
+}
+
+#define DEFN_SYSCALL3(fn, num, P1, P2, P3) \
+int syscall_##fn(P1 p1, P2 p2, P3 p3) \
+{ \
+  int a; \
+  asm volatile("int $0x80" : "=a" (a) : "0" (num), "b" ((int)p1), "c" ((int)p2), "d"((int)p3)); \
+  return a; \
+}
+
+#define DEFN_SYSCALL4(fn, num, P1, P2, P3, P4) \
+int syscall_##fn(P1 p1, P2 p2, P3 p3, P4 p4) \
+{ \
+  int a; \
+  asm volatile("int $0x80" : "=a" (a) : "0" (num), "b" ((int)p1), "c" ((int)p2), "d" ((int)p3), "S" ((int)p4)); \
+  return a; \
+}
+
+#define DEFN_SYSCALL5(fn, num) \
+int syscall_##fn(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) \
+{ \
+  int a; \
+  asm volatile("int $0x80" : "=a" (a) : "0" (num), "b" ((int)p1), "c" ((int)p2), "d" ((int)p3), "S" ((int)p4), "D" ((int)p5)); \
+  return a; \
+}
+
+/**
+ * DECLARATIONS
+ */
+DECL_SYSCALL0(halt);
+
+DECL_SYSCALL1(write, const char *);
+
+DECL_SYSCALL1(read, const char *);
+
+DECL_SYSCALL1(writec, char);
+
+DECL_SYSCALL0(readc);
+
+DECL_SYSCALL0(get_pointers);
+
+DECL_SYSCALL1(alloc, uint32_t);
+
+DECL_SYSCALL1(free, uint32_t);
+
+#endif
\ No newline at end of file