diff options
Diffstat (limited to 'nuttx/arch/x86/src/qemu/qemu_head.S')
| -rwxr-xr-x | nuttx/arch/x86/src/qemu/qemu_head.S | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/nuttx/arch/x86/src/qemu/qemu_head.S b/nuttx/arch/x86/src/qemu/qemu_head.S new file mode 100755 index 000000000..a1c816827 --- /dev/null +++ b/nuttx/arch/x86/src/qemu/qemu_head.S @@ -0,0 +1,126 @@ +/****************************************************************************
+ * arch/x86/src/qemu/qemu_head.S
+ *
+ * Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ * Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * .text
+ ****************************************************************************/
+
+#ifdef CONFIG_X86_NASM
+global loader /* Making entry point visible to linker */
+extern os_start /* os_start is defined elsewhere */
+extern up_lowsetup /* up_lowsetup is defined elsewhere */
+
+/* Setting up the Multiboot header - see GRUB docs for details */
+
+MODULEALIGN equ 1<<0 /* Align loaded modules on page boundaries */
+MEMINFO equ 1<<1 /* Provide memory map */
+FLAGS equ MODULEALIGN | MEMINFO /* This is the Multiboot 'flag' field */
+MAGIC equ 0x1BADB002 /* 'magic number' lets bootloader find the header */
+CHECKSUM equ -(MAGIC + FLAGS) /* Checksum required */
+
+section .text
+align 4
+MultiBootHeader:
+ dd MAGIC
+ dd FLAGS
+ dd CHECKSUM
+
+/* Reserve initial kernel stack space */
+
+STACKSIZE equ 0x4000 /* That's 16k */
+
+loader:
+ mov esp, stack+STACKSIZE /* Set up the stack */
+ push eax /* Pass Multiboot magic number */
+ push ebx /* Pass Multiboot info structure */
+
+ call up_lowsetup /* Low-level, pre-OS initialization */
+ call os_start /* Start NuttX */
+
+ cli
+hang:
+ hlt /* Halt machine should NuttX return */
+ jmp hang
+
+section .bss
+align 4
+stack:
+ resb STACKSIZE /* Reserve 16k stack on a doubleword boundary */
+
+#else /* GAS */
+
+ .global loader /* Making entry point visible to linker */
+ .global os_start /* os_start is defined elsewhere */
+ .global up_lowsetup /* up_lowsetup is defined elsewhere */
+
+/* Setting up the Multiboot header - see GRUB docs for details */
+
+ .set ALIGN, 1<<0 /* Align loaded modules on page boundaries */
+ .set MEMINFO, 1<<1 /* Provide memory map */
+ .set FLAGS, ALIGN | MEMINFO /* This is the Multiboot 'flag' field */
+ .set MAGIC, 0x1BADB002 /* 'magic number' lets bootloader find the header */
+ .set CHECKSUM, -(MAGIC + FLAGS) /* Checksum required */
+
+ .align 4
+ .long MAGIC
+ .long FLAGS
+ .long CHECKSUM
+
+/* Reserve initial kernel stack space */
+
+ .set STACKSIZE, 0x4000 /* That is, 16k */
+ .comm stack, STACKSIZE, 32 /* Reserve 16k stack on a quadword boundary */
+
+loader:
+ mov $(stack + STACKSIZE), %esp /* Set up the stack */
+ push %eax /* Multiboot magic number */
+ push %ebx /* Multiboot data structure */
+
+ call up_lowsetup /* Low-level, pre-OS initialization */
+ call os_start /* Start NuttX */
+
+ cli
+hang:
+ hlt /* Halt machine should NuttX return */
+ jmp hang
+#endif
+ .end
+#endif
\ No newline at end of file |