debuggers.hg

changeset 17089:55ae3b66b1b6

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x86/64: Make BIOS call to declare our intention to enter long mode.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 14 11:24:49 2008 +0000 (2008-02-14)
parents 72f52dd2dba8
children 8210e430be2b 9e9ba5185ef1
files xen/arch/x86/boot/trampoline.S
line diff
     1.1 --- a/xen/arch/x86/boot/trampoline.S	Thu Feb 14 11:14:17 2008 +0000
     1.2 +++ b/xen/arch/x86/boot/trampoline.S	Thu Feb 14 11:24:49 2008 +0000
     1.3 @@ -155,6 +155,13 @@ 1:      mov     $(BOOT_TRAMPOLINE>>4),%a
     1.4          lidt    bootsym(rm_idt)
     1.5          sti
     1.6  
     1.7 +#if defined(__x86_64__)
     1.8 +        /* Declare that our target operating mode is long mode. */
     1.9 +        movw    $0xec00,%ax      # declare target operating mode
    1.10 +        movw    $0x0002,%bx      # long mode
    1.11 +        int     $0x15
    1.12 +#endif
    1.13 +
    1.14          /*
    1.15           * Do real-mode work:
    1.16           *  1. Get memory map.