freebsd-skq/sys/boot/ia64/common/exec.c

/* $FreeBSD$ */
/* $NetBSD: loadfile.c,v 1.10 1998/06/25 06:45:46 ross Exp $ */

/*-
 * Copyright (c) 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)boot.c	8.1 (Berkeley) 6/10/93
 */

#include <stand.h>
#include <string.h>

#include <sys/param.h>
#include <sys/linker.h>
#include <machine/elf.h>
#include <machine/bootinfo.h>
#include <machine/pte.h>

#include <efi.h>
#include <efilib.h>

#include "bootstrap.h"

#define _KERNEL

static int	elf_exec(struct preloaded_file *amp);

struct file_format ia64_elf = { elf_loadfile, elf_exec };

static __inline u_int64_t
disable_ic()
{
	u_int64_t psr;
	__asm __volatile("mov %0=psr;;" : "=r" (psr));
	__asm __volatile("rsm psr.ic|psr.i;; srlz.i;;");
	return psr;
}

static __inline void
restore_ic(u_int64_t psr)
{
	__asm __volatile("mov psr.l=%0;; srlz.i" :: "r" (psr));
}

/*
 * Entered with psr.ic and psr.i both zero.
 */
void
enter_kernel(u_int64_t start, struct bootinfo *bi, UINTN mapkey)
{
	u_int64_t		psr;
	EFI_STATUS		status;

	status = BS->ExitBootServices(IH, mapkey);
	if (EFI_ERROR(status)) {
		printf("ExitBootServices returned 0x%lx\n", status);
		return;
	}

	__asm __volatile("srlz.i;;");
	__asm __volatile("mov cr.ipsr=%0"
			 :: "r"(IA64_PSR_IC
				| IA64_PSR_DT
				| IA64_PSR_RT
				| IA64_PSR_IT
				| IA64_PSR_BN));
	__asm __volatile("mov cr.iip=%0" :: "r"(start));
	__asm __volatile("mov cr.ifs=r0;;");
	__asm __volatile("mov ar.rsc=0;; flushrs;;");

	__asm __volatile("rfi;;");
}

static int
elf_exec(struct preloaded_file *fp)
{
	struct file_metadata	*md;
	Elf_Ehdr		*hdr;
	struct ia64_pte		pte;
	struct bootinfo		*bi;
	u_int64_t		psr;
	UINTN			mapkey;

	if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
		return(EFTYPE);			/* XXX actually EFUCKUP */
	hdr = (Elf_Ehdr *)&(md->md_data);

	printf("Entering %s at 0x%lx...\n", fp->f_name, hdr->e_entry);

	/*
	 * Ugly hack, similar to linux. Dump the bootinfo into a
	 * special page reserved in the link map.
	 */
	bi = (struct bootinfo *) 0x508000;
	bzero(bi, sizeof(struct bootinfo));
	bi_load(bi, fp, &mapkey);

	/*
	 * Region 6 is direct mapped UC and region 7 is direct mapped
	 * WC. The details of this is controlled by the Alt {I,D}TLB
	 * handlers. Here we just make sure that they have the largest 
	 * possible page size to minimise TLB usage.
	 */
	ia64_set_rr(IA64_RR_BASE(6), (6 << 8) | (28 << 2));
	ia64_set_rr(IA64_RR_BASE(7), (7 << 8) | (28 << 2));

	psr = disable_ic();

	bzero(&pte, sizeof(pte));
	pte.pte_p = 1;
	pte.pte_ma = PTE_MA_WB;
	pte.pte_a = 1;
	pte.pte_d = 1;
	pte.pte_pl = PTE_PL_KERN;
	pte.pte_ar = PTE_AR_RWX;
	pte.pte_ppn = 0;

	__asm __volatile("mov cr.ifa=%0" :: "r"(IA64_RR_BASE(7)));
	__asm __volatile("mov cr.itir=%0" :: "r"(28 << 2));
	__asm __volatile("ptr.i %0,%1" :: "r"(IA64_RR_BASE(7)), "r"(28<<2));
	__asm __volatile("ptr.d %0,%1" :: "r"(IA64_RR_BASE(7)), "r"(28<<2));
	__asm __volatile("srlz.i;;");
	__asm __volatile("itr.i itr[%0]=%1;;"
			 :: "r"(0), "r"(*(u_int64_t*)&pte));
	__asm __volatile("itr.d dtr[%0]=%1;;"
			 :: "r"(0), "r"(*(u_int64_t*)&pte));
	__asm __volatile("srlz.i;;");

	bzero(&pte, sizeof(pte));
	pte.pte_p = 1;
	pte.pte_ma = PTE_MA_UC;
	pte.pte_a = 1;
	pte.pte_d = 1;
	pte.pte_pl = PTE_PL_KERN;
	pte.pte_ar = PTE_AR_RWX;
	pte.pte_ppn = 0xffffc000000 >> 12;

	__asm __volatile("mov cr.ifa=%0" :: "r"(IA64_PHYS_TO_RR6(0xffffc000000)));
	__asm __volatile("mov cr.itir=%0" :: "r"(26 << 2));
	//__asm __volatile("ptr.d %0,%1" :: "r"(IA64_PHYS_TO_RR6(0xffffc000000)), "r"(26<<2));
	__asm __volatile("srlz.i;;");
	__asm __volatile("itr.d dtr[%0]=%1;;"
			 :: "r"(1), "r"(*(u_int64_t*)&pte));
	__asm __volatile("srlz.i;;");

	enter_kernel(hdr->e_entry, bi, mapkey);

	restore_ic(psr);
}