diff options
Diffstat (limited to 'arch/x86/lguest/i386_head.S')
| -rw-r--r-- | arch/x86/lguest/i386_head.S | 17 |
1 files changed, 4 insertions, 13 deletions
diff --git a/arch/x86/lguest/i386_head.S b/arch/x86/lguest/i386_head.S index ba4282eba5bf..ebc6ac733899 100644 --- a/arch/x86/lguest/i386_head.S +++ b/arch/x86/lguest/i386_head.S @@ -5,11 +5,8 @@ #include <asm/thread_info.h> #include <asm/processor-flags.h> -/*G:020 This is where we begin: we have a magic signature which the launcher - * looks for. The plan is that the Linux boot protocol will be extended with a - * "platform type" field which will guide us here from the normal entry point, - * but for the moment this suffices. The normal boot code uses %esi for the - * boot header, so we do too. +/*G:020 This is where we begin: head.S notes that the boot header's platform + * type field is "1" (lguest), so calls us here. The boot header is in %esi. * * WARNING: be very careful here! We're running at addresses equal to physical * addesses (around 0), not above PAGE_OFFSET as most code expectes @@ -19,19 +16,14 @@ * The .section line puts this code in .init.text so it will be discarded after * boot. */ .section .init.text, "ax", @progbits -.ascii "GenuineLguest" +ENTRY(lguest_entry) /* Make initial hypercall now, so we can set up the pagetables. */ movl $LHCALL_LGUEST_INIT, %eax movl $lguest_data - __PAGE_OFFSET, %edx int $LGUEST_TRAP_ENTRY - /* Set up boot information pointer to hand to lguest_init(): it wants - * a virtual address. */ - movl %esi, %eax - addl $__PAGE_OFFSET, %eax - /* The Host put the toplevel pagetable in lguest_data.pgdir. The movsl - * instruction uses %esi, so we needed to save it above. */ + * instruction uses %esi implicitly. */ movl lguest_data - __PAGE_OFFSET + LGUEST_DATA_pgdir, %esi /* Copy first 32 entries of page directory to __PAGE_OFFSET entries. @@ -47,7 +39,6 @@ /* Set up the initial stack so we can run C code. */ movl $(init_thread_union+THREAD_SIZE),%esp - /* Jumps are relative, and we're running __PAGE_OFFSET too low at the * moment. */ jmp lguest_init+__PAGE_OFFSET |