added precompiled linux boot sector

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@652 c046a42c-6fe2-441c-8c8c-71466251a162

Makefile

@@ -39,7 +39,8 @@ install: all
 	mkdir -p $(prefix)/bin
 	install -m 755 -s $(TOOLS) $(prefix)/bin
 	mkdir -p $(sharedir)
-	install -m 644 pc-bios/bios.bin pc-bios/vgabios.bin $(sharedir)
+	install -m 644 pc-bios/bios.bin pc-bios/vgabios.bin \
+                       pc-bios/linux_boot.bin $(sharedir)
 	mkdir -p $(mandir)/man1
 	install qemu.1 $(mandir)/man1
 	for d in $(TARGET_DIRS); do \

Makefile.target

@@ -206,9 +206,6 @@ endif
 
 # must use static linking to avoid leaving stuff in virtual address space
 VL_OBJS=vl.o block.o ide.o vga.o sb16.o dma.o oss.o fdc.o osdep.o
-ifeq ($(TARGET_ARCH), i386)
-VL_OBJS+=linux_boot.o	
-endif
 ifeq ($(TARGET_ARCH), ppc)
 VL_OBJS+= hw.o
 endif

pc-bios/Makefile

+#
+# NOTE: only compilable with x86 cross compile tools
+#
+include ../config-host.mak
+
+DEFINES=
+
+TARGETS=
+ifeq ($(ARCH),i386)
+TARGETS+=linux_boot.bin
+endif
+
+all: $(TARGETS)
+
+linux_boot.bin: linux_boot.o
+	ld --oformat binary -Ttext 0 -o $@ $<
+	chmod a-x $@
+
+%.o: %.S
+	$(CC) $(DEFINES) -c -o $@ $<
+
+clean:
+	rm -f $(TARGETS) *.o *~
+

linux_boot.S → pc-bios/linux_boot.S

@@ -7,10 +7,9 @@
         
 .code16	
 .text
-	.globl	linux_boot_start
-	.globl	linux_boot_end
+	.globl	_start
 
-linux_boot_start:
+_start:
         cli
         cld
         mov $LOAD_SEG, %ax
@@ -23,10 +22,8 @@ linux_boot_start:
         ljmp $LOAD_SEG + 0x20, $0
 
 1:              
-        .fill 510 - (1b - linux_boot_start), 1, 0
+        .fill 510 - (1b - _start), 1, 0
 
         /* boot sector signature */
         .byte 0x55
         .byte 0xaa
-                
-linux_boot_end:

vl.c

@@ -53,6 +53,7 @@
 #define DEFAULT_NETWORK_SCRIPT "/etc/qemu-ifup"
 #define BIOS_FILENAME "bios.bin"
 #define VGABIOS_FILENAME "vgabios.bin"
+#define LINUX_BOOT_FILENAME "linux_boot.bin"
 
 //#define DEBUG_UNUSED_IOPORT
 
@@ -3463,15 +3464,21 @@ int main(int argc, char **argv)
     bochs_bios_init();
 
     if (linux_boot) {
-        extern uint8_t linux_boot_start;
-        extern uint8_t linux_boot_end;
+        uint8_t bootsect[512];
 
         if (bs_table[0] == NULL) {
             fprintf(stderr, "A disk image must be given for 'hda' when booting a Linux kernel\n");
             exit(1);
         }
-        bdrv_set_boot_sector(bs_table[0], &linux_boot_start,
-                             &linux_boot_end - &linux_boot_start);
+        snprintf(buf, sizeof(buf), "%s/%s", bios_dir, LINUX_BOOT_FILENAME);
+        ret = load_image(buf, bootsect);
+        if (ret != sizeof(bootsect)) {
+            fprintf(stderr, "qemu: could not load linux boot sector '%s'\n",
+                    buf);
+            exit(1);
+        }
+
+        bdrv_set_boot_sector(bs_table[0], bootsect, sizeof(bootsect));
 
         /* now we can load the kernel */
         ret = load_kernel(kernel_filename,