Messages in this thread | | | Date | Thu, 21 Dec 2006 09:24:58 +0530 | From | Vivek Goyal <> | Subject | Re: Patch "i386: Relocatable kernel support" causes instant reboot |
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On Thu, Dec 21, 2006 at 07:56:01AM +0530, Vivek Goyal wrote: [..] > > # Manual, Mixing 16-bit and 32-bit code, page 16-6) > > > > .byte 0x66, 0xea # prefix + jmpi-opcode > > -code32: .long 0x1000 # will be set to 0x100000 > > - # for big kernels > > +code32: .long startup_32 # will be set to %cs+startup_32 > > .word __BOOT_CS > > +.code32 > > +startup_32: > > + movl $(__BOOT_DS), %eax > > + movl %eax, %ds > > + movl %eax, %es > > + movl %eax, %fs > > + movl %eax, %gs > > + movl %eax, %ss > > + > > + xorl %eax, %eax > > +1: incl %eax # check that A20 really IS enabled > > + movl %eax, 0x00000000 # loop forever if it isn't > > + cmpl %eax, 0x00100000 > > + je 1b > > + > > + # Jump to the 32bit entry point > > + jmpl *(code32_start - start + (DELTA_INITSEG << 4))(%esi) > > Hi Eric, > > I got a basic query. Why have we introduced this additional jump to > startup_32 in the same file? Won't it work if we stick to old method of > enabling protected mode and then directly taking a jmp to startup_32 in > arch/i386/kernel/head.S. Am I missing something obivious? >
Sorry, I meant arch/i386/boot/compressed/head.S and not arch/i386/kernel/head.S
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