1 files changed, 25 insertions, 0 deletions
diff --git a/kernel/entry.S b/kernel/entry.S
new file mode 100644
index 0000000..b3d2c55
--- /dev/null
+++ b/kernel/entry.S
@@ -0,0 +1,25 @@
+	# qemu -kernel starts at 0x1000. the instructions
+        # there seem to be provided by qemu, as if it
+        # were a ROM. the code at 0x1000 jumps to
+        # 0x8000000, the _start function here,
+        # in machine mode.
+.section .data
+.globl stack0
+.section .text
+.globl mstart
+.section .text
+.globl _entry
+_entry:
+	# set up a stack for C.
+        # stack0 is declared in start,
+        # with 4096 bytes per CPU.
+        la sp, stack0
+        li a0, 1024*4
+	csrr a1, mhartid
+        addi a1, a1, 1
+        mul a0, a0, a1
+        add sp, sp, a0
+	# jump to mstart() in start.c
+        call mstart
+junk:
+        j junk