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author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-22 20:45:50 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-22 20:45:50 (GMT) |
commit | a7e1aabb28e8154ce987b622fd78d80a1ca39361 (patch) | |
tree | 8671d8faf51d43665045b7362a177a23dc88921b /arch/x86/lguest/i386_head.S | |
parent | 111ad119d1765b1bbef2629a5f2bd825caeb7e74 (diff) | |
parent | 996ba96a97f7406052486682846d68935a60e986 (diff) | |
download | linux-fsl-qoriq-a7e1aabb28e8154ce987b622fd78d80a1ca39361.tar.xz |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
lguest: Fix in/out emulation
lguest: Fix translation count about wikipedia's cpuid page
lguest: Fix three simple typos in comments
lguest: update comments
lguest: Simplify device initialization.
lguest: don't rewrite vmcall instructions
lguest: remove remaining vmcall
lguest: use a special 1:1 linear pagetable mode until first switch.
lguest: Do not exit on non-fatal errors
Diffstat (limited to 'arch/x86/lguest/i386_head.S')
-rw-r--r-- | arch/x86/lguest/i386_head.S | 35 |
1 files changed, 20 insertions, 15 deletions
diff --git a/arch/x86/lguest/i386_head.S b/arch/x86/lguest/i386_head.S index 4f420c2f..6ddfe4f 100644 --- a/arch/x86/lguest/i386_head.S +++ b/arch/x86/lguest/i386_head.S @@ -6,18 +6,22 @@ #include <asm/processor-flags.h> /*G:020 - * Our story starts with the kernel booting into startup_32 in - * arch/x86/kernel/head_32.S. It expects a boot header, which is created by - * the bootloader (the Launcher in our case). + + * Our story starts with the bzImage: booting starts at startup_32 in + * arch/x86/boot/compressed/head_32.S. This merely uncompresses the real + * kernel in place and then jumps into it: startup_32 in + * arch/x86/kernel/head_32.S. Both routines expects a boot header in the %esi + * register, which is created by the bootloader (the Launcher in our case). * * The startup_32 function does very little: it clears the uninitialized global * C variables which we expect to be zero (ie. BSS) and then copies the boot - * header and kernel command line somewhere safe. Finally it checks the - * 'hardware_subarch' field. This was introduced in 2.6.24 for lguest and Xen: - * if it's set to '1' (lguest's assigned number), then it calls us here. + * header and kernel command line somewhere safe, and populates some initial + * page tables. Finally it checks the 'hardware_subarch' field. This was + * introduced in 2.6.24 for lguest and Xen: if it's set to '1' (lguest's + * assigned number), then it calls us here. * * WARNING: be very careful here! We're running at addresses equal to physical - * addesses (around 0), not above PAGE_OFFSET as most code expectes + * addresses (around 0), not above PAGE_OFFSET as most code expects * (eg. 0xC0000000). Jumps are relative, so they're OK, but we can't touch any * data without remembering to subtract __PAGE_OFFSET! * @@ -27,13 +31,18 @@ .section .init.text, "ax", @progbits ENTRY(lguest_entry) /* - * We make the "initialization" hypercall now to tell the Host about - * us, and also find out where it put our page tables. + * We make the "initialization" hypercall now to tell the Host where + * our lguest_data struct is. */ movl $LHCALL_LGUEST_INIT, %eax movl $lguest_data - __PAGE_OFFSET, %ebx int $LGUEST_TRAP_ENTRY + /* Now turn our pagetables on; setup by arch/x86/kernel/head_32.S. */ + movl $LHCALL_NEW_PGTABLE, %eax + movl $(initial_page_table - __PAGE_OFFSET), %ebx + int $LGUEST_TRAP_ENTRY + /* Set up the initial stack so we can run C code. */ movl $(init_thread_union+THREAD_SIZE),%esp @@ -96,12 +105,8 @@ send_interrupts: */ pushl %eax movl $LHCALL_SEND_INTERRUPTS, %eax - /* - * This is a vmcall instruction (same thing that KVM uses). Older - * assembler versions might not know the "vmcall" instruction, so we - * create one manually here. - */ - .byte 0x0f,0x01,0xc1 /* KVM_HYPERCALL */ + /* This is the actual hypercall trap. */ + int $LGUEST_TRAP_ENTRY /* Put eax back the way we found it. */ popl %eax ret |