The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/xen/locore.s

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)locore.s      7.3 (Berkeley) 5/13/91
   33  * $FreeBSD: stable/9/sys/i386/xen/locore.s 201716 2010-01-07 04:47:09Z alc $
   34  *
   35  *              originally from: locore.s, by William F. Jolitz
   36  *
   37  *              Substantially rewritten by David Greenman, Rod Grimes,
   38  *                      Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp
   39  *                      and many others.
   40  */
   41 
   42 #include "opt_bootp.h"
   43 #include "opt_compat.h"
   44 #include "opt_nfsroot.h"
   45 #include "opt_global.h"
   46 #include "opt_pmap.h"
   47 
   48 #include <sys/syscall.h>
   49 #include <sys/reboot.h>
   50 
   51 #include <machine/asmacros.h>
   52 #include <machine/cputypes.h>
   53 #include <machine/psl.h>
   54 #include <machine/pmap.h>
   55 #include <machine/specialreg.h>
   56 
   57 #define __ASSEMBLY__    
   58 #include <xen/interface/elfnote.h>
   59                 
   60 /* The defines below have been lifted out of <machine/xen-public/arch-x86_32.h> */
   61 #define FLAT_RING1_CS 0xe019    /* GDT index 259 */
   62 #define FLAT_RING1_DS 0xe021    /* GDT index 260 */
   63 #define KERNEL_CS FLAT_RING1_CS 
   64 #define KERNEL_DS FLAT_RING1_DS
   65 
   66 #include "assym.s"
   67 
   68 .section __xen_guest
   69         .ascii "LOADER=generic,GUEST_OS=freebsd,GUEST_VER=7.0,XEN_VER=xen-3.0,BSD_SYMTAB,VIRT_BASE=0xc0000000"
   70         .byte 0
   71 
   72         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS,       .asciz, "FreeBSD")     
   73         ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION,  .asciz, "HEAD")
   74         ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION,    .asciz, "xen-3.0")
   75         ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE,      .long,  KERNBASE)
   76         ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET,   .long,  KERNBASE)
   77         ELFNOTE(Xen, XEN_ELFNOTE_ENTRY,          .long,  btext)
   78         ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, .long,  hypercall_page)
   79         ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW,   .long,  HYPERVISOR_VIRT_START)
   80 #if 0
   81         ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,       .asciz, "writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel")
   82 #endif
   83         ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,       .asciz, "writable_page_tables|supervisor_mode_kernel|writable_descriptor_tables")
   84                 
   85 #ifdef PAE
   86         ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE,       .asciz, "yes")
   87         ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,   .long,  PG_V, PG_V)
   88 #else
   89         ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE,       .asciz, "no")
   90         ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,   .long,  PG_V, PG_V)
   91 #endif
   92         ELFNOTE(Xen, XEN_ELFNOTE_LOADER,         .asciz, "generic")
   93         ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long,  1)             
   94 
   95         
   96         
   97 /*
   98  *      XXX
   99  *
  100  * Note: This version greatly munged to avoid various assembler errors
  101  * that may be fixed in newer versions of gas. Perhaps newer versions
  102  * will have more pleasant appearance.
  103  */
  104 
  105 /*
  106  * PTmap is recursive pagemap at top of virtual address space.
  107  * Within PTmap, the page directory can be found (third indirection).
  108  */
  109         .globl  PTmap,PTD,PTDpde
  110         .set    PTmap,(PTDPTDI << PDRSHIFT)
  111         .set    PTD,PTmap + (PTDPTDI * PAGE_SIZE)
  112         .set    PTDpde,PTD + (PTDPTDI * PDESIZE)
  113 
  114 /*
  115  * Compiled KERNBASE location and the kernel load address
  116  */
  117         .globl  kernbase
  118         .set    kernbase,KERNBASE
  119         .globl  kernload
  120         .set    kernload,KERNLOAD
  121 
  122 /*
  123  * Globals
  124  */
  125         .data
  126         ALIGN_DATA                      /* just to be sure */
  127 
  128         .space  0x2000                  /* space for tmpstk - temporary stack */
  129 tmpstk:
  130 
  131                 .globl  bootinfo
  132 bootinfo:       .space  BOOTINFO_SIZE   /* bootinfo that we can handle */
  133 
  134                 .globl KERNend
  135 KERNend:        .long   0               /* phys addr end of kernel (just after bss) */
  136                 .globl physfree
  137 physfree:       .long   0               /* phys addr of next free page */
  138 
  139         .globl  IdlePTD
  140 IdlePTD:        .long   0               /* phys addr of kernel PTD */
  141 
  142 #ifdef PAE
  143         .globl  IdlePDPT
  144 IdlePDPT:       .long   0               /* phys addr of kernel PDPT */
  145 #endif
  146 
  147 #ifdef SMP
  148         .globl  KPTphys
  149 #endif
  150 KPTphys:        .long   0               /* phys addr of kernel page tables */
  151         .globl  gdtset
  152 gdtset:         .long   0               /* GDT is valid */      
  153 
  154         .globl  proc0kstack
  155 proc0kstack:    .long   0               /* address of proc 0 kstack space */
  156 p0kpa:          .long   0               /* phys addr of proc0's STACK */
  157 
  158 vm86phystk:     .long   0               /* PA of vm86/bios stack */
  159 
  160         .globl  vm86paddr, vm86pa
  161 vm86paddr:      .long   0               /* address of vm86 region */
  162 vm86pa:         .long   0               /* phys addr of vm86 region */
  163 
  164 #ifdef PC98
  165         .globl  pc98_system_parameter
  166 pc98_system_parameter:
  167         .space  0x240
  168 #endif
  169 
  170         .globl  avail_space
  171 avail_space:    .long 0
  172 
  173 /**********************************************************************
  174  *
  175  * Some handy macros
  176  *
  177  */
  178 
  179 /*
  180  * We're already in protected mode, so no remapping is needed.
  181  */     
  182 #define R(foo) (foo)
  183         
  184 #define ALLOCPAGES(foo) \
  185         movl    R(physfree), %esi ; \
  186         movl    $((foo)*PAGE_SIZE), %eax ; \
  187         addl    %esi, %eax ; \
  188         movl    %eax, R(physfree) ; \
  189         movl    %esi, %edi ; \
  190         movl    $((foo)*PAGE_SIZE),%ecx ; \
  191         xorl    %eax,%eax ; \
  192         cld ; \
  193         rep ; \
  194         stosb
  195 
  196 /*
  197  * fillkpt
  198  *      eax = page frame address
  199  *      ebx = index into page table
  200  *      ecx = how many pages to map
  201  *      base = base address of page dir/table
  202  *      prot = protection bits
  203  */
  204 #define fillkpt(base, prot)               \
  205         shll    $PTESHIFT,%ebx          ; \
  206         addl    base,%ebx               ; \
  207         orl     $PG_V,%eax              ; \
  208         orl     prot,%eax               ; \
  209 1:      movl    %eax,(%ebx)             ; \
  210         addl    $PAGE_SIZE,%eax         ; /* increment physical address */ \
  211         addl    $PTESIZE,%ebx           ; /* next pte */ \
  212         loop    1b
  213 
  214 /*
  215  * fillkptphys(prot)
  216  *      eax = physical address
  217  *      ecx = how many pages to map
  218  *      prot = protection bits
  219  */
  220 #define fillkptphys(prot)                 \
  221         movl    %eax, %ebx              ; \
  222         shrl    $PAGE_SHIFT, %ebx       ; \
  223         fillkpt(R(KPTphys), prot)
  224 
  225 /* Temporary stack */
  226 .space  8192
  227 tmpstack:
  228         .long   tmpstack, KERNEL_DS
  229 
  230         .text
  231 
  232 .p2align 12,    0x90    
  233                 
  234 #define HYPERCALL_PAGE_OFFSET 0x1000
  235 .org HYPERCALL_PAGE_OFFSET
  236 ENTRY(hypercall_page)
  237         .cfi_startproc
  238         .skip   0x1000
  239         .cfi_endproc
  240 
  241 /**********************************************************************
  242  *
  243  * This is where the bootblocks start us, set the ball rolling...
  244  *
  245  */
  246 NON_GPROF_ENTRY(btext)
  247         /* At the end of our stack, we shall have free space - so store it */
  248         movl    %esp,%ebx
  249         movl    %ebx,R(avail_space)
  250 
  251         lss     tmpstack,%esp
  252 
  253         pushl   %esi
  254         call    initvalues      
  255         popl    %esi
  256 
  257         /* Store the CPUID information */
  258         xorl    %eax,%eax
  259         cpuid                                   # cpuid 0
  260         movl    %eax,R(cpu_high)                # highest capability
  261         movl    %ebx,R(cpu_vendor)              # store vendor string
  262         movl    %edx,R(cpu_vendor+4)
  263         movl    %ecx,R(cpu_vendor+8)
  264         movb    $0,R(cpu_vendor+12)
  265 
  266         movl    $1,%eax
  267         cpuid                                   # cpuid 1
  268         movl    %eax,R(cpu_id)                  # store cpu_id
  269         movl    %ebx,R(cpu_procinfo)            # store cpu_procinfo
  270         movl    %edx,R(cpu_feature)             # store cpu_feature
  271         movl    %ecx,R(cpu_feature2)            # store cpu_feature2
  272         rorl    $8,%eax                         # extract family type
  273         andl    $15,%eax
  274         cmpl    $5,%eax
  275         movl    $CPU_686,R(cpu)
  276 
  277         movl    proc0kstack,%eax
  278         leal    (KSTACK_PAGES*PAGE_SIZE-PCB_SIZE)(%eax),%esp
  279         xorl    %ebp,%ebp               /* mark end of frames */
  280 #ifdef PAE
  281         movl    IdlePDPT,%esi
  282 #else   
  283         movl    IdlePTD,%esi
  284 #endif  
  285         movl    %esi,(KSTACK_PAGES*PAGE_SIZE-PCB_SIZE+PCB_CR3)(%eax)
  286         pushl   physfree
  287         call    init386
  288         addl    $4, %esp
  289         call    mi_startup
  290         /* NOTREACHED */
  291         int     $3
  292 
  293 /*
  294  * Signal trampoline, copied to top of user stack
  295  */
  296 NON_GPROF_ENTRY(sigcode)
  297         calll   *SIGF_HANDLER(%esp)
  298         leal    SIGF_UC(%esp),%eax      /* get ucontext */
  299         pushl   %eax
  300         testl   $PSL_VM,UC_EFLAGS(%eax)
  301         jne     1f
  302         mov     UC_GS(%eax), %gs        /* restore %gs */
  303 1:
  304         movl    $SYS_sigreturn,%eax
  305         pushl   %eax                    /* junk to fake return addr. */
  306         int     $0x80                   /* enter kernel with args */
  307                                         /* on stack */
  308 1:
  309         jmp     1b
  310 
  311 #ifdef COMPAT_FREEBSD4
  312         ALIGN_TEXT
  313 freebsd4_sigcode:
  314         calll   *SIGF_HANDLER(%esp)
  315         leal    SIGF_UC4(%esp),%eax     /* get ucontext */
  316         pushl   %eax
  317         testl   $PSL_VM,UC4_EFLAGS(%eax)
  318         jne     1f
  319         mov     UC4_GS(%eax),%gs        /* restore %gs */
  320 1:
  321         movl    $344,%eax               /* 4.x SYS_sigreturn */
  322         pushl   %eax                    /* junk to fake return addr. */
  323         int     $0x80                   /* enter kernel with args */
  324                                         /* on stack */
  325 1:
  326         jmp     1b
  327 #endif
  328 
  329 #ifdef COMPAT_43
  330         ALIGN_TEXT
  331 osigcode:
  332         call    *SIGF_HANDLER(%esp)     /* call signal handler */
  333         lea     SIGF_SC(%esp),%eax      /* get sigcontext */
  334         pushl   %eax
  335         testl   $PSL_VM,SC_PS(%eax)
  336         jne     9f
  337         movl    SC_GS(%eax),%gs         /* restore %gs */
  338 9:
  339         movl    $103,%eax               /* 3.x SYS_sigreturn */
  340         pushl   %eax                    /* junk to fake return addr. */
  341         int     $0x80                   /* enter kernel with args */
  342 0:      jmp     0b
  343 #endif /* COMPAT_43 */
  344 
  345         ALIGN_TEXT
  346 esigcode:
  347 
  348         .data
  349         .globl  szsigcode
  350 szsigcode:
  351         .long   esigcode-sigcode
  352 #ifdef COMPAT_FREEBSD4
  353         .globl  szfreebsd4_sigcode
  354 szfreebsd4_sigcode:
  355         .long   esigcode-freebsd4_sigcode
  356 #endif
  357 #ifdef COMPAT_43
  358         .globl  szosigcode
  359 szosigcode:
  360         .long   esigcode-osigcode
  361 #endif

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