2007-07-19 16:49:22 +08:00
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#include <linux/linkage.h>
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#include <linux/lguest.h>
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#include <asm/asm-offsets.h>
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#include <asm/thread_info.h>
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/* FIXME: Once asm/processor-flags.h goes in, include that */
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#define X86_EFLAGS_IF 0x00000200
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/*
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* This is where we begin: we have a magic signature which the launcher looks
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* for. The plan is that the Linux boot protocol will be extended with a
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* "platform type" field which will guide us here from the normal entry point,
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2007-07-19 16:49:23 +08:00
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* but for the moment this suffices. We pass the virtual address of the boot
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* info to lguest_init().
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2007-07-19 16:49:22 +08:00
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*
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* We put it in .init.text will be discarded after boot.
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*/
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.section .init.text, "ax", @progbits
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.ascii "GenuineLguest"
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/* Set up initial stack. */
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movl $(init_thread_union+THREAD_SIZE),%esp
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2007-07-19 16:49:23 +08:00
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movl %esi, %eax
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addl $__PAGE_OFFSET, %eax
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2007-07-19 16:49:22 +08:00
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jmp lguest_init
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/* The templates for inline patching. */
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#define LGUEST_PATCH(name, insns...) \
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lgstart_##name: insns; lgend_##name:; \
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.globl lgstart_##name; .globl lgend_##name
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LGUEST_PATCH(cli, movl $0, lguest_data+LGUEST_DATA_irq_enabled)
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LGUEST_PATCH(sti, movl $X86_EFLAGS_IF, lguest_data+LGUEST_DATA_irq_enabled)
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LGUEST_PATCH(popf, movl %eax, lguest_data+LGUEST_DATA_irq_enabled)
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LGUEST_PATCH(pushf, movl lguest_data+LGUEST_DATA_irq_enabled, %eax)
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.text
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/* These demark the EIP range where host should never deliver interrupts. */
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.global lguest_noirq_start
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.global lguest_noirq_end
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/*
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* We move eflags word to lguest_data.irq_enabled to restore interrupt state.
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* For page faults, gpfs and virtual interrupts, the hypervisor has saved
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* eflags manually, otherwise it was delivered directly and so eflags reflects
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* the real machine IF state, ie. interrupts on. Since the kernel always dies
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* if it takes such a trap with interrupts disabled anyway, turning interrupts
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* back on unconditionally here is OK.
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*/
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ENTRY(lguest_iret)
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pushl %eax
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movl 12(%esp), %eax
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lguest_noirq_start:
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movl %eax,%ss:lguest_data+LGUEST_DATA_irq_enabled
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popl %eax
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iret
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lguest_noirq_end:
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