diff options
Diffstat (limited to 'grub-core/tests/boot/kernel-8086.S')
| -rw-r--r-- | grub-core/tests/boot/kernel-8086.S | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/grub-core/tests/boot/kernel-8086.S b/grub-core/tests/boot/kernel-8086.S new file mode 100644 index 0000000..20040da --- /dev/null +++ b/grub-core/tests/boot/kernel-8086.S @@ -0,0 +1,69 @@ + +#define SHUTDOWN_PORT 0x8900 + + .text + .globl _start +_start: +base: + .code16 + jmp cont + +portmsg: + xorw %ax, %ax +1: + movb 0(%si), %al + test %ax, %ax + jz 1f + outb %al, %dx + incw %si + jmp 1b +1: + ret + +serialmsg: +1: + movb 0(%si), %bl + testb %bl, %bl + jz 1f + movw $0x3fd, %dx +2: + inb %dx, %al + testb $0x20, %al + jz 2b + + movw $0x3f8, %dx + movb %bl, %al + outb %al, %dx + incw %si + jmp 1b +1: + ret + +cont: +#ifdef TARGET_NTLDR + movw $0x2000, %ax +#elif defined (TARGET_CHAINLOADER) + xorw %ax, %ax +#else +#error unsupported target +#endif + movw %ax, %ds + lea message, %si + call serialmsg + lea shutdown, %si + movw $SHUTDOWN_PORT, %dx + call portmsg + +1: + hlt + jmp 1b + +shutdown: + .ascii "Shutdown" + .byte 0 +message: + .ascii "Boot Test Passed Successfully\n" SUCCESSFUL_BOOT_STRING "\n" + .byte 0 + + . = base + 510 + .short 0xaa55
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