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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/stand/efi/loader/arch/amd64/amd64_tramp.S
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/*-

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 * Copyright (c) 2013 The FreeBSD Foundation

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 *

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 * This software was developed by Benno Rice under sponsorship from

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 * the FreeBSD Foundation.

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Redistributions in binary form must reproduce the above copyright

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 *    notice, this list of conditions and the following disclaimer in the

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 *    documentation and/or other materials provided with the distribution.

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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 * SUCH DAMAGE.

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 */

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#include <machine/asmacros.h>

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#define ASM_FILE

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#include "multiboot2.h"

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	.text

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	.globl	amd64_tramp

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/*

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 * void amd64_tramp(uint64_t stack, void *copy_finish, uint64_t kernend,

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 *		    uint64_t modulep, uint64_t pagetable, uint64_t entry)

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 */

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amd64_tramp:

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	cli			/* Make sure we don't get interrupted. */

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	movq	%rdi,%rsp	/* Switch to our temporary stack. */

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	movq	%rdx,%r12	/* Stash the kernel values for later. */

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	movq	%rcx,%r13

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	movq	%r8,%r14

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	movq	%r9,%r15

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	callq	*%rsi		/* Call copy_finish so we're all ready to go. */

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	pushq	%r12		/* Push kernend. */

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	salq	$32,%r13	/* Shift modulep and push it. */

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	pushq	%r13

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	pushq	%r15		/* Push the entry address. */

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	movq	%r14,%cr3	/* Switch page tables. */

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	ret			/* "Return" to kernel entry. */

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	ALIGN_TEXT

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amd64_tramp_end:

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/* void multiboot2_exec(uint64_t entry, uint64_t multiboot_info, uint64_t stack) */

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	.globl	multiboot2_exec

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multiboot2_exec:

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	movq	%rdx,%rsp

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	pushq	%rdi

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	movq	%rsi,%rbx

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	movq	$MULTIBOOT2_BOOTLOADER_MAGIC,%rax

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	ret

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	.data

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	.globl	amd64_tramp_size

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amd64_tramp_size:

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	.long	amd64_tramp_end-amd64_tramp

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