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9beb1d0779
speculative loads. This at least makes control speculative loads work. In the future we should analyze which faults/exceptions we want to handle rather than defer to avoid having to call the recovery code when it's not strictly necessary.
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/*-
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* Copyright (c) 2006 Marcel Moolenaar
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* All rights reserved.
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*
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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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*
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stand.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/linker.h>
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#include <machine/elf.h>
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#include <machine/ia64_cpu.h>
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#include <machine/pte.h>
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#include <ia64/include/bootinfo.h>
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#include <ia64/include/vmparam.h>
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#include <efi.h>
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#include <efilib.h>
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#include "bootstrap.h"
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#define _KERNEL
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static int elf64_exec(struct preloaded_file *amp);
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struct file_format ia64_elf = { elf64_loadfile, elf64_exec };
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/*
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* Entered with psr.ic and psr.i both zero.
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*/
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void
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enter_kernel(uint64_t start, uint64_t bi)
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{
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__asm __volatile("srlz.i;;");
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__asm __volatile("mov cr.ipsr=%0"
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:: "r"(IA64_PSR_IC
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| IA64_PSR_DT
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| IA64_PSR_RT
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| IA64_PSR_IT
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| IA64_PSR_BN));
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__asm __volatile("mov cr.iip=%0" :: "r"(start));
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__asm __volatile("mov cr.ifs=r0;;");
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__asm __volatile("mov ar.rsc=0;; flushrs;;");
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__asm __volatile("mov r8=%0" :: "r" (bi));
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__asm __volatile("rfi;;");
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/* NOTREACHED */
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}
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static int
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elf64_exec(struct preloaded_file *fp)
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{
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struct file_metadata *md;
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Elf_Ehdr *hdr;
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pt_entry_t pte;
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uint64_t bi_addr;
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md = file_findmetadata(fp, MODINFOMD_ELFHDR);
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if (md == NULL)
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return (EINVAL);
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hdr = (Elf_Ehdr *)&(md->md_data);
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bi_load(fp, &bi_addr);
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printf("Entering %s at 0x%lx...\n", fp->f_name, hdr->e_entry);
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ldr_enter(fp->f_name);
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__asm __volatile("rsm psr.ic|psr.i;;");
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__asm __volatile("srlz.i;;");
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/*
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* Region 6 is direct mapped UC and region 7 is direct mapped
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* WC. The details of this is controlled by the Alt {I,D}TLB
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* handlers. Here we just make sure that they have the largest
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* possible page size to minimise TLB usage.
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*/
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ia64_set_rr(IA64_RR_BASE(6), (6 << 8) | (28 << 2));
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ia64_set_rr(IA64_RR_BASE(7), (7 << 8) | (28 << 2));
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pte = PTE_PRESENT | PTE_MA_WB | PTE_ACCESSED | PTE_DIRTY |
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PTE_PL_KERN | PTE_AR_RWX | PTE_ED;
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__asm __volatile("mov cr.ifa=%0" :: "r"(IA64_RR_BASE(7)));
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__asm __volatile("mov cr.itir=%0" :: "r"(28 << 2));
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__asm __volatile("ptr.i %0,%1" :: "r"(IA64_RR_BASE(7)), "r"(28<<2));
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__asm __volatile("ptr.d %0,%1" :: "r"(IA64_RR_BASE(7)), "r"(28<<2));
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__asm __volatile("srlz.i;;");
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__asm __volatile("itr.i itr[%0]=%1;;" :: "r"(0), "r"(pte));
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__asm __volatile("srlz.i;;");
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__asm __volatile("itr.d dtr[%0]=%1;;" :: "r"(0), "r"(pte));
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__asm __volatile("srlz.i;;");
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enter_kernel(hdr->e_entry, bi_addr);
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/* NOTREACHED */
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return (0);
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}
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