xnu-1699.26.8.tar.gz

[apple/xnu.git] / osfmk / i386 / start.s

diff --git a/osfmk/i386/start.s b/osfmk/i386/start.s
index 0607eee1e949c1e9f5998d66ced74eca10669831..5472ffde37d1182ac0ee30e8cbfd8bddf49cb650 100644 (file)
--- a/osfmk/i386/start.s
+++ b/osfmk/i386/start.s
@@ -1,23 +1,29 @@
 /*
  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
  *
 /*
  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
  *

- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  * 
  * 

- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.

  * 
  * 

- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER

  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.

  * 
  * 

- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 /*
  * @OSF_COPYRIGHT@
  */
 /*
  * @OSF_COPYRIGHT@


@@ -51,138 +57,88 @@
  */
 
 #include <platforms.h>
  */
 
 #include <platforms.h>

-#include <cpus.h>
-#include <mach_kdb.h>

 
 #include <i386/asm.h>
 #include <i386/proc_reg.h>
 
 #include <i386/asm.h>
 #include <i386/proc_reg.h>

+#include <i386/postcode.h>

 #include <assym.s>
 
 #include <assym.s>
 

-#if    NCPUS > 1
-

 #define        CX(addr,reg)    addr(,reg,4)
 
 #define        CX(addr,reg)    addr(,reg,4)
 

-#else
-
-#define        CPU_NUMBER(reg)
-#define        CX(addr,reg)    addr
-
-#endif /* NCPUS > 1 */
-
-#include <i386/mp.h>
+#include <i386/acpi.h>
+#include <i386/cpuid.h>

 
 /*
 
 /*

- * GAS won't handle an intersegment jump with a relocatable offset.
+ * Interrupt and bootup stack for initial processor.

  */
  */

-#define        LJMP(segment,address)   \
-       .byte   0xea            ;\
-       .long   address         ;\
-       .word   segment
-

 
 

+/* in the __HIB section since the hibernate restore code uses this stack. */
+       .section __HIB, __data
+       .align  12

 
 

-#define KVTOPHYS       (-KERNELBASE)
-#define        KVTOLINEAR      LINEAR_KERNELBASE
+       .globl  EXT(low_intstack)
+EXT(low_intstack):
+       .globl  EXT(gIOHibernateRestoreStack)
+EXT(gIOHibernateRestoreStack):

 
 

+       .space  INTSTACK_SIZE

 
 

-#define        PA(addr)        (addr)+KVTOPHYS
-#define        VA(addr)        (addr)-KVTOPHYS
+       .globl  EXT(low_eintstack)
+EXT(low_eintstack:)
+       .globl  EXT(gIOHibernateRestoreStackEnd)
+EXT(gIOHibernateRestoreStackEnd):

 
 

-       .data
-       .align  2
-       .globl  EXT(_kick_buffer_)
-EXT(_kick_buffer_):
-       .long   1
-       .long   3
-       .set    .,.+16836

 /*
 /*

- * Interrupt and bootup stack for initial processor.
+ * Pointers to GDT and IDT.  These contain linear addresses.

  */
        .align  ALIGN
  */
        .align  ALIGN

-       .globl  EXT(intstack)
-EXT(intstack):
-       .set    ., .+INTSTACK_SIZE
-       .globl  EXT(eintstack)
-EXT(eintstack:)
-
-#if    NCPUS == 1
-       .globl  EXT(int_stack_high)     /* all interrupt stacks */
-EXT(int_stack_high):                   /* must lie below this */
-       .long   EXT(eintstack)          /* address */
-
-       .globl  EXT(int_stack_top)      /* top of interrupt stack */
-EXT(int_stack_top):
-       .long   EXT(eintstack)
-#endif
+       .globl  EXT(gdtptr)
+       /* align below properly */
+       .word   0 
+LEXT(gdtptr)
+       .word   Times(8,GDTSZ)-1
+       .long   EXT(master_gdt)

 
 

-#if    MACH_KDB
-/*
- * Kernel debugger stack for each processor.
- */
-       .align  ALIGN
-       .globl  EXT(db_stack_store)
-EXT(db_stack_store):
-       .set    ., .+(INTSTACK_SIZE*NCPUS)
+       /* back to the regular __DATA section. */
+
+       .section __DATA, __data

 
 /*
 
 /*

- * Stack for last-ditch debugger task for each processor.
+ * Stack for last-gasp double-fault handler.

  */
  */

-       .align  ALIGN
-       .globl  EXT(db_task_stack_store)
-EXT(db_task_stack_store):
-       .set    ., .+(INTSTACK_SIZE*NCPUS)
-#endif /* MACH_KDB */
+       .align  12
+       .globl  EXT(df_task_stack)
+EXT(df_task_stack):
+       .space  INTSTACK_SIZE
+       .globl  EXT(df_task_stack_end)
+EXT(df_task_stack_end):
+

 
 /*
 
 /*

- * per-processor kernel debugger stacks
+ * Stack for machine-check handler.

  */
  */

-        .align  ALIGN
-        .globl  EXT(kgdb_stack_store)
-EXT(kgdb_stack_store):
-        .set    ., .+(INTSTACK_SIZE*NCPUS)
-
+       .align  12
+       .globl  EXT(mc_task_stack)
+EXT(mc_task_stack):
+       .space  INTSTACK_SIZE
+       .globl  EXT(mc_task_stack_end)
+EXT(mc_task_stack_end):

 
 

+#if    MACH_KDB

 /*
 /*

- * Pointers to GDT and IDT.  These contain linear addresses.
+ * Stack for last-ditch debugger task for each processor.

  */
  */

-       .align  ALIGN
-       .globl  EXT(gdtptr)
-LEXT(gdtptr)
-       .word   Times(8,GDTSZ)-1
-       .long   EXT(gdt)+KVTOLINEAR
+       .align  12
+       .globl  EXT(db_task_stack_store)
+EXT(db_task_stack_store):
+       .space  (INTSTACK_SIZE*MAX_CPUS)
+
+#endif /* MACH_KDB */

 
 

-       .align  ALIGN
-       .globl  EXT(idtptr)
-LEXT(idtptr)
-       .word   Times(8,IDTSZ)-1
-       .long   EXT(idt)+KVTOLINEAR
-
-#if    NCPUS > 1
-       .data
-       /*
-        *      start_lock is very special.  We initialize the
-        *      lock at allocation time rather than at run-time.
-        *      Although start_lock should be an instance of a
-        *      hw_lock, we hand-code all manipulation of the lock
-        *      because the hw_lock code may require function calls;
-        *      and we'd rather not introduce another dependency on
-        *      a working stack at this point.
-        */
-       .globl  EXT(start_lock)
-EXT(start_lock):
-       .long   0                       /* synchronizes processor startup */
-
-       .globl  EXT(master_is_up)
-EXT(master_is_up):
-       .long   0                       /* 1 when OK for other processors */
-                                       /* to start */
-       .globl  EXT(mp_boot_pde)
-EXT(mp_boot_pde):
-       .long   0
-#endif /* NCPUS > 1 */

 
 /*
 
 /*

- * All CPUs start here.
+ * BSP CPU start here.
+ *     eax points to kernbootstruct

  *
  * Environment:
  *     protected mode, no paging, flat 32-bit address space.
  *
  * Environment:
  *     protected mode, no paging, flat 32-bit address space.


@@ -190,434 +146,192 @@ EXT(mp_boot_pde):
  */
        .text
        .align  ALIGN
  */
        .text
        .align  ALIGN

-       .globl  EXT(pstart)

        .globl  EXT(_start)
 LEXT(_start)
        .globl  EXT(_start)
 LEXT(_start)

-LEXT(pstart)
-       mov     %eax, %ebx              /* save pointer to kernbootstruct */
-       mov     $0,%ax                  /* fs must be zeroed; */
-       mov     %ax,%fs                 /* some bootstrappers don`t do this */
-       mov     %ax,%gs
-
-#if    NCPUS > 1
-       jmp     1f
-0:     cmpl    $0,PA(EXT(start_lock))
-       jne     0b
-1:     movb    $1,%eax
-       xchgl   %eax,PA(EXT(start_lock)) /* locked */
-       testl   %eax,%eax
-       jnz     0b
-
-       cmpl    $0,PA(EXT(master_is_up))        /* are we first? */
-       jne     EXT(slave_start)                /* no -- system already up. */
-       movl    $1,PA(EXT(master_is_up))        /* others become slaves */
-#endif /* NCPUS > 1 */
+       mov             %ds, %bx
+       mov             %bx, %es
+       mov             %eax, %ebp              /* Move kernbootstruct to ebp */
+       mov             %eax, %ebx              /* get pointer to kernbootstruct */

 
 

-/*
- * Get startup parameters.
- */
+       mov     $EXT(low_eintstack),%esp                        /* switch to the bootup stack */

 
 

-#include <i386/AT386/asm_startup.h>
+       POSTCODE(PSTART_ENTRY)

 
 

-/*
- * Build initial page table directory and page tables.
- * %ebx holds first available physical address.
- */
+       lgdt    EXT(gdtptr)                                     /* load GDT */

 
 

-       addl    $(NBPG-1),%ebx          /* round first avail physical addr */
-       andl    $(-NBPG),%ebx           /* to machine page size */
-       leal    -KVTOPHYS(%ebx),%eax    /* convert to virtual address */
-       movl    %eax,PA(EXT(kpde))      /* save as kernel page table directory */
-       movl    %ebx,%cr3               /* set physical address in CR3 now */
-
-       movl    %ebx,%edi               /* clear page table directory */
-       movl    $(PTES_PER_PAGE),%ecx   /* one page of ptes */
-       xorl    %eax,%eax
+       mov     $(KERNEL_DS),%ax                                /* set kernel data segment */
+       mov     %ax, %ds
+       mov     %ax, %es
+       mov     %ax, %ss
+       xor     %ax, %ax                                                /* fs must be zeroed; */
+       mov     %ax, %fs                                                /* some bootstrappers don`t do this */
+       mov     %ax, %gs

        cld
        cld

-       rep
-       stosl                           /* edi now points to next page */

 
 

-/*
- * Use next few pages for page tables.
- */
-       addl    $(KERNELBASEPDE),%ebx   /* point to pde for kernel base */
-       movl    %edi,%esi               /* point to end of current pte page */
+       /* "The Aussie Maneuver" ("Myria" variant) */
+       pushl $(0xcb<<24)|KERNEL32_CS           /* reload CS  */
+       call .-1

 
 

-/*
- * Enter 1-1 mappings for kernel and for kernel page tables.
- */
-       movl    $(INTEL_PTE_KERNEL),%eax /* set up pte prototype */
-0:
-       cmpl    %esi,%edi               /* at end of pte page? */
-       jb      1f                      /* if so: */
-       movl    %edi,%edx               /*    get pte address (physical) */
-       andl    $(-NBPG),%edx           /*    mask out offset in page */
-       orl     $(INTEL_PTE_KERNEL),%edx /*   add pte bits */
-       movl    %edx,(%ebx)             /*    set pde */
-       addl    $4,%ebx                 /*    point to next pde */
-       movl    %edi,%esi               /*    point to */
-       addl    $(NBPG),%esi            /*    end of new pte page */
-1:
-       movl    %eax,(%edi)             /* set pte */
-       addl    $4,%edi                 /* advance to next pte */
-       addl    $(NBPG),%eax            /* advance to next phys page */
-       cmpl    %edi,%eax               /* have we mapped this pte page yet? */
-       jb      0b                      /* loop if not */
-
-/*
- * Zero rest of last pte page.
- */
-       xor     %eax,%eax               /* don`t map yet */
-2:     cmpl    %esi,%edi               /* at end of pte page? */
-       jae     3f
-       movl    %eax,(%edi)             /* zero mapping */
-       addl    $4,%edi
-       jmp     2b
-3:
-
-#if    NCPUS > 1
-/*
- * Grab (waste?) another page for a bootstrap page directory
- * for the other CPUs.  We don't want the running CPUs to see
- * addresses 0..3fffff mapped 1-1.
- */
-       movl    %edi,PA(EXT(mp_boot_pde)) /* save its physical address */
-       movl    $(PTES_PER_PAGE),%ecx   /* and clear it */
-       rep
-       stosl
-#endif /* NCPUS > 1 */
-       movl    %edi,PA(EXT(first_avail)) /* save first available phys addr */
-
-/*
- * pmap_bootstrap will enter rest of mappings.
- */
-
-/*
- * Fix initial descriptor tables.
- */
-       lea     PA(EXT(idt)),%esi       /* fix IDT */
-       movl    $(IDTSZ),%ecx
-       movl    $(PA(fix_idt_ret)),%ebx
-       jmp     fix_desc_common         /* (cannot use stack) */
-fix_idt_ret:
-
-       lea     PA(EXT(gdt)),%esi       /* fix GDT */
-       movl    $(GDTSZ),%ecx
-       movl    $(PA(fix_gdt_ret)),%ebx
-       jmp     fix_desc_common         /* (cannot use stack) */
-fix_gdt_ret:
-
-       lea     PA(EXT(ldt)),%esi       /* fix LDT */
-       movl    $(LDTSZ),%ecx
-       movl    $(PA(fix_ldt_ret)),%ebx
-       jmp     fix_desc_common         /* (cannot use stack) */
-fix_ldt_ret:
+paging:
+       andl    $0xfffffff0, %esp                               /* align stack */
+       subl    $0xc, %esp
+       pushl   %ebp                                            /* push boot args addr */
+       xorl    %ebp, %ebp                                      /* zero frame pointer */
+       
+       POSTCODE(PSTART_BEFORE_PAGING)

 
 /*
  * Turn on paging.
  */
 
 /*
  * Turn on paging.
  */

-       movl    %cr3,%eax               /* retrieve kernel PDE phys address */
-       movl    KERNELBASEPDE(%eax),%ecx
-       movl    %ecx,(%eax)             /* set it also as pte for location */
-                                       /* 0..3fffff, so that the code */
-                                       /* that enters paged mode is mapped */
-                                       /* to identical addresses after */
-                                       /* paged mode is enabled */
-
-       addl    $4,%eax                 /* 400000..7fffff */
-       movl    KERNELBASEPDE(%eax),%ecx
-       movl    %ecx,(%eax)
-
-       movl    $ EXT(pag_start),%ebx   /* first paged code address */
-
-       movl    %cr0,%eax
-       orl     $(CR0_PG),%eax          /* set PG bit in CR0 */
-       orl     $(CR0_WP),%eax
-       movl    %eax,%cr0               /* to enable paging */
-
-       jmp     *%ebx                   /* flush prefetch queue */
-
-/*
- * We are now paging, and can run with correct addresses.
- */
-LEXT(pag_start)
-       lgdt    EXT(gdtptr)             /* load GDT */
-       lidt    EXT(idtptr)             /* load IDT */
-       LJMP(KERNEL_CS,EXT(vstart))     /* switch to kernel code segment */
-
-/*
- * Master is now running with correct addresses.
- */
-LEXT(vstart)
-       mov     $(KERNEL_DS),%ax        /* set kernel data segment */
-       mov     %ax,%ds
-       mov     %ax,%es
-       mov     %ax,%ss
-       mov     %ax,EXT(ktss)+TSS_SS0   /* set kernel stack segment */
-                                       /* for traps to kernel */
-#if    MACH_KDB
-       mov     %ax,EXT(dbtss)+TSS_SS0  /* likewise for debug task switch */
-       mov     %cr3,%eax               /* get PDBR into debug TSS */
-       mov     %eax,EXT(dbtss)+TSS_PDBR
-       mov     $0,%eax
-#endif
-
-       movw    $(KERNEL_LDT),%ax       /* get LDT segment */
-       lldt    %ax                     /* load LDT */
-#if    MACH_KDB
-       mov     %ax,EXT(ktss)+TSS_LDT   /* store LDT in two TSS, as well... */
-       mov     %ax,EXT(dbtss)+TSS_LDT  /*   ...matters if we switch tasks */
-#endif
-       movw    $(KERNEL_TSS),%ax
-       ltr     %ax                     /* set up KTSS */
-
-       mov     $ CPU_DATA,%ax
-       mov     %ax,%gs
-
-       lea     EXT(eintstack),%esp     /* switch to the bootup stack */
-       call    EXT(i386_init)          /* run C code */
+       movl    $EXT(IdlePDPT), %eax            /* CR3 */
+       movl    %eax, %cr3
+       movl    %cr4, %eax                                      /* PAE */
+       orl     $(CR4_PAE), %eax
+       movl    %eax, %cr4
+       movl    %cr0,%eax                                       /* paging */
+       orl     $(CR0_PG|CR0_WP),%eax
+       movl    %eax,%cr0
+       
+       call    EXT(vstart)                                     /* run C code */

        /*NOTREACHED*/
        hlt
 
        /*NOTREACHED*/
        hlt
 

-#if    NCPUS > 1

 /*
 /*

- * master_up is used by the master cpu to signify that it is done
- * with the interrupt stack, etc. See the code in pstart and svstart
- * that this interlocks with.
- */
-       .align  ALIGN
-       .globl  EXT(master_up)
-LEXT(master_up)
-       pushl   %ebp                    /* set up */
-       movl    %esp,%ebp               /* stack frame */
-       movl    $0,%ecx                 /* unlock start_lock */
-       xchgl   %ecx,EXT(start_lock)    /* since we are no longer using */
-                                       /* bootstrap stack */
-       leave                           /* pop stack frame */
-       ret
-
-/*
- * We aren't the first.  Call slave_main to initialize the processor
- * and get Mach going on it.
+ * AP (slave) CPUs enter here.
+ *
+ * Environment:
+ *     protected mode, no paging, flat 32-bit address space.
+ *     (Code/data/stack segments have base == 0, limit == 4G)

  */
        .align  ALIGN
  */
        .align  ALIGN

-       .globl  EXT(slave_start)
-LEXT(slave_start)
+       .globl  EXT(slave_pstart)
+LEXT(slave_pstart)

        cli                             /* disable interrupts, so we don`t */
                                        /* need IDT for a while */
        cli                             /* disable interrupts, so we don`t */
                                        /* need IDT for a while */

-       movl    EXT(kpde)+KVTOPHYS,%ebx /* get PDE virtual address */
-       addl    $(KVTOPHYS),%ebx        /* convert to physical address */
-
-       movl    PA(EXT(mp_boot_pde)),%edx /* point to the bootstrap PDE */
-       movl    KERNELBASEPDE(%ebx),%eax
-                                       /* point to pte for KERNELBASE */
-       movl    %eax,KERNELBASEPDE(%edx)
-                                       /* set in bootstrap PDE */
-       movl    %eax,(%edx)             /* set it also as pte for location */
-                                       /* 0..3fffff, so that the code */
-                                       /* that enters paged mode is mapped */
-                                       /* to identical addresses after */
-                                       /* paged mode is enabled */
-       movl    %edx,%cr3               /* use bootstrap PDE to enable paging */
-
-       movl    $ EXT(spag_start),%edx  /* first paged code address */
-
-       movl    %cr0,%eax
-       orl     $(CR0_PG),%eax          /* set PG bit in CR0 */
-       orl     $(CR0_WP),%eax
-       movl    %eax,%cr0               /* to enable paging */
-
-       jmp     *%edx                   /* flush prefetch queue. */
-
-/*
- * We are now paging, and can run with correct addresses.
- */
-LEXT(spag_start)
-
-       lgdt    EXT(gdtptr)             /* load GDT */
-       lidt    EXT(idtptr)             /* load IDT */
-       LJMP(KERNEL_CS,EXT(svstart))    /* switch to kernel code segment */
-
-/*
- * Slave is now running with correct addresses.
- */
-LEXT(svstart)
-       mov     $(KERNEL_DS),%ax        /* set kernel data segment */
-       mov     %ax,%ds
-       mov     %ax,%es
-       mov     %ax,%ss
+       xor %ebp, %ebp  // zero boot cpu
+       mov $EXT(mp_slave_stack)+PAGE_SIZE, %esp;
+       jmp paging

 
 

-       movl    %ebx,%cr3               /* switch to the real kernel PDE  */

 
 

-       CPU_NUMBER(%eax)
-       movl    CX(EXT(interrupt_stack),%eax),%esp /* get stack */
-       addl    $(INTSTACK_SIZE),%esp   /* point to top */
-       xorl    %ebp,%ebp               /* for completeness */
+/* Code to get from real mode to protected mode */

 
 

-       movl    $0,%ecx                 /* unlock start_lock */
-       xchgl   %ecx,EXT(start_lock)    /* since we are no longer using */
-                                       /* bootstrap stack */
-
-/*
- * switch to the per-cpu descriptor tables
- */
+#define        operand_size_prefix     .byte 0x66
+#define        address_size_prefix     .byte 0x67
+#define        cs_base_prefix          .byte 0x2e

 
 

-       pushl   %eax                    /* pass CPU number */
-       call    EXT(mp_desc_init)       /* set up local table */
-                                       /* pointer returned in %eax */
-       subl    $4,%esp                 /* get space to build pseudo-descriptors */
-       
-       CPU_NUMBER(%eax)
-       movw    $(GDTSZ*8-1),0(%esp)    /* set GDT size in GDT descriptor */
-       movl    CX(EXT(mp_gdt),%eax),%edx
-       addl    $ KVTOLINEAR,%edx
-       movl    %edx,2(%esp)            /* point to local GDT (linear address) */
-       lgdt    0(%esp)                 /* load new GDT */
-       
-       movw    $(IDTSZ*8-1),0(%esp)    /* set IDT size in IDT descriptor */
-       movl    CX(EXT(mp_idt),%eax),%edx
-       addl    $ KVTOLINEAR,%edx
-       movl    %edx,2(%esp)            /* point to local IDT (linear address) */
-       lidt    0(%esp)                 /* load new IDT */
-       
-       movw    $(KERNEL_LDT),%ax       /* get LDT segment */
-       lldt    %ax                     /* load LDT */
-
-       movw    $(KERNEL_TSS),%ax
-       ltr     %ax                     /* load new KTSS */
-
-       mov     $ CPU_DATA,%ax
-       mov     %ax,%gs
-
-       call    EXT(slave_main)         /* start MACH */
-       /*NOTREACHED*/
-       hlt
-#endif /* NCPUS > 1 */
+#undef LJMP
+#define        LJMP(segment,address)                   \
+       operand_size_prefix                     ;\
+       .byte   0xea                            ;\
+       .long   address-EXT(real_mode_bootstrap_base)   ;\
+       .word   segment

 
 

-/*
- * Convert a descriptor from fake to real format.
- *
- * Calls from assembly code:
- * %ebx = return address (physical) CANNOT USE STACK
- * %esi        = descriptor table address (physical)
- * %ecx = number of descriptors
- *
- * Calls from C:
- * 0(%esp) = return address
- * 4(%esp) = descriptor table address (physical)
- * 8(%esp) = number of descriptors
- *
- * Fake descriptor format:
- *     bytes 0..3              base 31..0
- *     bytes 4..5              limit 15..0
- *     byte  6                 access byte 2 | limit 19..16
- *     byte  7                 access byte 1
- *
- * Real descriptor format:
- *     bytes 0..1              limit 15..0
- *     bytes 2..3              base 15..0
- *     byte  4                 base 23..16
- *     byte  5                 access byte 1
- *     byte  6                 access byte 2 | limit 19..16
- *     byte  7                 base 31..24
- *
- * Fake gate format:
- *     bytes 0..3              offset
- *     bytes 4..5              selector
- *     byte  6                 word count << 4 (to match fake descriptor)
- *     byte  7                 access byte 1
- *
- * Real gate format:
- *     bytes 0..1              offset 15..0
- *     bytes 2..3              selector
- *     byte  4                 word count
- *     byte  5                 access byte 1
- *     bytes 6..7              offset 31..16
- */
-       .globl  EXT(fix_desc)
-LEXT(fix_desc)
-       pushl   %ebp                    /* set up */
-       movl    %esp,%ebp               /* stack frame */
-       pushl   %esi                    /* save registers */
-       pushl   %ebx
-       movl    B_ARG0,%esi             /* point to first descriptor */
-       movl    B_ARG1,%ecx             /* get number of descriptors */
-       lea     0f,%ebx                 /* get return address */
-       jmp     fix_desc_common         /* call internal routine */
-0:     popl    %ebx                    /* restore registers */
-       popl    %esi
-       leave                           /* pop stack frame */
-       ret                             /* return */
-
-fix_desc_common:
-0:
-       movw    6(%esi),%dx             /* get access byte */
-       movb    %dh,%al
-       andb    $0x14,%al
-       cmpb    $0x04,%al               /* gate or descriptor? */
-       je      1f
-
-/* descriptor */
-       movl    0(%esi),%eax            /* get base in eax */
-       rol     $16,%eax                /* swap 15..0 with 31..16 */
-                                       /* (15..0 in correct place) */
-       movb    %al,%dl                 /* combine bits 23..16 with ACC1 */
-                                       /* in dh/dl */
-       movb    %ah,7(%esi)             /* store bits 31..24 in correct place */
-       movw    4(%esi),%ax             /* move limit bits 0..15 to word 0 */
-       movl    %eax,0(%esi)            /* store (bytes 0..3 correct) */
-       movw    %dx,4(%esi)             /* store bytes 4..5 */
-       jmp     2f
-
-/* gate */
+#define        LGDT(address)                           \
+       cs_base_prefix                          ;\
+       address_size_prefix                     ;\
+       operand_size_prefix                     ;\
+       .word   0x010f                          ;\
+       .byte   0x15                            ;\
+       .long   address-EXT(real_mode_bootstrap_base)
+
+.section __HIB,__text
+.align 12      /* Page align for single bcopy_phys() */
+.code32
+Entry(real_mode_bootstrap_base)
+       cli
+
+       LGDT(EXT(protected_mode_gdtr))
+
+       /* set the PE bit of CR0 */
+       mov     %cr0, %eax
+       inc %eax
+       mov     %eax, %cr0 
+
+       /* reload CS register */
+       LJMP(KERNEL32_CS, 1f + REAL_MODE_BOOTSTRAP_OFFSET)

 1:
 1:

-       movw    4(%esi),%ax             /* get selector */
-       shrb    $4,%dl                  /* shift word count to proper place */
-       movw    %dx,4(%esi)             /* store word count / ACC1 */
-       movw    2(%esi),%dx             /* get offset 16..31 */
-       movw    %dx,6(%esi)             /* store in correct place */
-       movw    %ax,2(%esi)             /* store selector in correct place */
-2:
-       addl    $8,%esi                 /* bump to next descriptor */
-       loop    0b                      /* repeat */
-       jmp     *%ebx                   /* all done */
-
-/*
- * put arg in kbd leds and spin a while
- * eats eax, ecx, edx
- */
-#define        K_RDWR          0x60
-#define        K_CMD_LEDS      0xed
-#define        K_STATUS        0x64
-#define        K_IBUF_FULL     0x02            /* input (to kbd) buffer full */
-#define        K_OBUF_FULL     0x01            /* output (from kbd) buffer full */
-
-ENTRY(set_kbd_leds)
-       mov     S_ARG0,%cl              /* save led value */
-       
-0:     inb     $(K_STATUS),%al         /* get kbd status */
-       testb   $(K_IBUF_FULL),%al      /* input busy? */
-       jne     0b                      /* loop until not */

        
        

-       mov     $(K_CMD_LEDS),%al       /* K_CMD_LEDS */
-       outb    %al,$(K_RDWR)           /* to kbd */
+       /* we are in protected mode now */
+       /* set up the segment registers */
+       mov     $KERNEL_DS, %eax
+       movw    %ax, %ds
+       movw    %ax, %es
+       movw    %ax, %ss
+       mov             $0, %ax
+       movw    %ax, %fs
+       movw    %ax, %gs

 
 

-0:     inb     $(K_STATUS),%al         /* get kbd status */
-       testb   $(K_OBUF_FULL),%al      /* output present? */
-       je      0b                      /* loop if not */
+       POSTCODE(SLAVE_STARTPROG_ENTRY);

 
 

-       inb     $(K_RDWR),%al           /* read status (and discard) */
+       mov     PROT_MODE_START+REAL_MODE_BOOTSTRAP_OFFSET, %ecx
+       jmp     *%ecx

 
 

-0:     inb     $(K_STATUS),%al         /* get kbd status */
-       testb   $(K_IBUF_FULL),%al      /* input busy? */
-       jne     0b                      /* loop until not */
-       
-       mov     %cl,%al                 /* move led value */
-       outb    %al,$(K_RDWR)           /* to kbd */
+Entry(protected_mode_gdtr)
+       .short  160             /* limit (8*6 segs) */
+       .long   EXT(master_gdt)

 
 

-       movl    $10000000,%ecx          /* spin */
-0:     nop
-       nop
-       loop    0b                      /* a while */
+Entry(real_mode_bootstrap_end)

 
 

-       ret
+.section __HIB,__text
+       .align  ALIGN
+       .globl  EXT(hibernate_machine_entrypoint)
+LEXT(hibernate_machine_entrypoint)
+       mov     %eax, %edi // save header pointer
+       /* restore gdt */
+       lgdt    EXT(protected_mode_gdtr)
+
+       /* setup the protected mode segment registers */
+       mov             $KERNEL_DS, %eax
+       movw    %ax, %ds
+       movw    %ax, %es
+       movw    %ax, %ss
+       mov             $0,%ax                  /* fs must be zeroed; */
+       mov             %ax,%fs
+       mov             %ax,%gs
+
+       /* set up the page tables to use BootstrapPTD 
+        * as done in idle_pt.c, but this must be done programatically */
+       mov $EXT(IdlePDPT), %eax
+       mov $EXT(BootstrapPTD) + (INTEL_PTE_VALID), %ecx
+       mov $0x0, %edx
+       mov     %ecx, (0*8+0)(%eax)
+       mov %edx, (0*8+4)(%eax)
+       add     $(PAGE_SIZE), %ecx
+       mov %ecx, (1*8+0)(%eax)
+       mov %edx, (1*8+4)(%eax)
+       add     $(PAGE_SIZE), %ecx
+       mov %ecx, (2*8+0)(%eax)
+       mov %edx, (2*8+4)(%eax)
+       add     $(PAGE_SIZE), %ecx
+       mov %ecx, (3*8+0)(%eax)
+       mov %edx, (3*8+4)(%eax)
+       mov %eax, %cr3
+
+
+       movl    %cr4,%eax
+       orl             $(CR4_PAE),%eax
+       movl    %eax,%cr4               /* enable page size extensions */
+
+       movl    $(MSR_IA32_EFER), %ecx                  /* MSR number in ecx */
+       rdmsr                                           /* MSR value return in edx: eax */
+       orl     $(MSR_IA32_EFER_NXE), %eax              /* Set NXE bit in low 32-bits */
+       wrmsr                                           /* Update Extended Feature Enable reg */
+
+       movl    %cr0, %eax
+       orl     $(CR0_PG|CR0_WP), %eax
+       movl    %eax, %cr0      /* ready paging */
+
+       mov $EXT(gIOHibernateRestoreStackEnd), %esp     /* setup stack */
+       xorl    %ebp, %ebp                              /* zero frame pointer */
+
+       ljmpl   $(KERNEL32_CS), $Ltemp
+Ltemp:
+       xorl    %eax, %eax              /* Video memory - N/A */
+       pushl   %eax
+       pushl   %eax
+       pushl   %eax
+       mov             %edi, %eax              /* Pointer to hibernate header */
+       pushl   %eax
+       call    EXT(hibernate_kernel_entrypoint)
+       /* NOTREACHED */
+       hlt