Something something with elfs and witches

2 files changed, 112 insertions, 0 deletions

diff --git a/apps/link.ld b/apps/link.ld
new file mode 100644
index 0000000..ee41578
--- /dev/null
+++ b/apps/link.ld
@@ -0,0 +1,24 @@
+ENTRY(main)
+SECTIONS
+{
+	.text 0x40000000:
+	{
+		code = .; _code = .; __code = .;
+		*(.text)
+	}
+
+	.data ALIGN(0x400000):
+	{
+		data = .; _data = .; __data = .;
+		*(.data)
+		*(.rodata)
+	}
+
+	.bss ALIGN(0x400000):
+	{
+		bss = .; _bss = .; __bss = .;
+		*(.bss)
+	}
+
+	end = .; _end = .; __end = .;
+}
diff --git a/apps/test.c b/apps/test.c
new file mode 100644
index 0000000..f9e40cb
--- /dev/null
+++ b/apps/test.c
@@ -0,0 +1,88 @@
+#include <def.h>
+
+u32 strlen(const char *s)
+{
+	const char *ss = s;
+	while (*ss)
+		ss++;
+	return ss - s;
+}
+
+u8 inb(u16 port)
+{
+	u8 value;
+	__asm__ volatile("inb %1, %0" : "=a"(value) : "Nd"(port));
+	return value;
+}
+
+u16 inw(u16 port)
+{
+	u16 value;
+	__asm__ volatile("inw %1, %0" : "=a"(value) : "Nd"(port));
+	return value;
+}
+
+u32 inl(u16 port)
+{
+	u32 value;
+	__asm__ volatile("inl %1, %0" : "=a"(value) : "Nd"(port));
+	return value;
+}
+
+void insl(u16 port, void *addr, int n)
+{
+	__asm__ volatile("cld; rep insl"
+			 : "=D"(addr), "=c"(n)
+			 : "d"(port), "0"(addr), "1"(n)
+			 : "memory", "cc");
+}
+
+void outb(u16 port, u8 data)
+{
+	__asm__ volatile("outb %0, %1" ::"a"(data), "Nd"(port));
+}
+
+void outw(u16 port, u16 data)
+{
+	__asm__ volatile("outw %0, %1" ::"a"(data), "Nd"(port));
+}
+
+void outl(u16 port, u32 data)
+{
+	__asm__ volatile("outl %0, %1" ::"a"(data), "Nd"(port));
+}
+
+void serial_install()
+{
+	outb(0x3f8 + 1, 0x00);
+	outb(0x3f8 + 3, 0x80);
+	outb(0x3f8 + 0, 0x03);
+	outb(0x3f8 + 1, 0x00);
+	outb(0x3f8 + 3, 0x03);
+	outb(0x3f8 + 2, 0xC7);
+	outb(0x3f8 + 4, 0x0B);
+}
+
+int is_transmit_empty()
+{
+	return inb(0x3f8 + 5) & 0x20;
+}
+
+void serial_put(char ch)
+{
+	while (is_transmit_empty() == 0)
+		;
+	outb(0x3f8, (u8)ch);
+}
+
+void serial_print(const char *data)
+{
+	for (u32 i = 0; i < strlen(data); i++)
+		serial_put(data[i]);
+}
+
+void main()
+{
+	serial_install();
+	serial_print("WELCOME TO USERSPACE");
+}