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boot: check for long mode support so we can complain if someone runs the wrong qemu

This commit is contained in:
K. Lange 2021-06-15 19:44:29 +09:00
parent 87d6784633
commit 1091bb5eec
1 changed files with 17 additions and 0 deletions
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17
boot/boot.S
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@ -48,6 +48,19 @@ unrealmode:
movl $0xb8000, %edi
addr32 rep stosb
/* Check if we can actually go to long mode on this */
mov $0x80000001, %eax
cpuid
and $0x20000000, %edx
jnz can_long
movl $str_Need_long, %esi
movl $str_Need_long_end - str_Need_long, %ecx
movl $0xb8000, %edi
addr32 rep movsb
jmp _oh_no
can_long:
/* Print "Loading..." */
movl $str_Loading, %esi
movl $str_Loading_end - str_Loading, %ecx
@ -262,3 +275,7 @@ str_Bad_end:
str_Loading:
.byte 'L',7,'o',7,'a',7,'d',7,'i',7,'n',7,'g',7,'.',7,'.',7,'.',7
str_Loading_end:
str_Need_long:
.byte 'T',7,'o',7,'a',7,'r',7,'u',7,'O',7,'S',7,' ',7,'2',7,' ',7,'r',7,'e',7,'q',7,'u',7,'i',7,'r',7,'e',7,'s',7,' ',7,'a',7,' ',7,'6',7,'4',7,'-',7,'b',7,'i',7,'t',7,' ',7,'p',7,'r',7,'o',7,'c',7,'e',7,'s',7,'s',7,'o',7,'r',7
str_Need_long_end: