xnu-4903.221.2.tar.gz

[apple/xnu.git] / osfmk / i386 / i386_vm_init.c

diff --git a/osfmk/i386/i386_vm_init.c b/osfmk/i386/i386_vm_init.c
index 2cf0278676ecd84ad7ca3d822c34cf0558f7c14c..9b74e8d449911ea58db3ba8e0e8edfa96ff2f799 100644 (file)
--- a/osfmk/i386/i386_vm_init.c
+++ b/osfmk/i386/i386_vm_init.c
@@ -1,23 +1,29 @@
 /*
 /*

- * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2003-2012 Apple 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@


@@ -48,8 +54,6 @@
  * the rights to redistribute these changes.
  */
 
  * the rights to redistribute these changes.
  */
 

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

 
 #include <mach/i386/vm_param.h>
 
 
 #include <mach/i386/vm_param.h>
 


@@ -68,80 +72,153 @@
 #include <vm/pmap.h>
 #include <vm/vm_kern.h>
 #include <i386/pmap.h>
 #include <vm/pmap.h>
 #include <vm/vm_kern.h>
 #include <i386/pmap.h>

-#include <i386/ipl.h>

 #include <i386/misc_protos.h>
 #include <i386/misc_protos.h>

-#include <i386/mp_slave_boot.h>

 #include <i386/cpuid.h>
 #include <mach/thread_status.h>
 #include <pexpert/i386/efi.h>
 #include <i386/cpuid.h>
 #include <mach/thread_status.h>
 #include <pexpert/i386/efi.h>

-#include "i386_lowmem.h"
+#include <i386/i386_lowmem.h>
+#include <x86_64/lowglobals.h>
+#include <i386/pal_routines.h>
+
+#include <mach-o/loader.h>
+#include <libkern/kernel_mach_header.h>
+

 
 vm_size_t      mem_size = 0; 
 
 vm_size_t      mem_size = 0; 

-vm_offset_t    first_avail = 0;/* first after page tables */
-vm_offset_t    last_addr;
+pmap_paddr_t   first_avail = 0;/* first after page tables */

 
 uint64_t       max_mem;        /* Size of physical memory (bytes), adjusted by maxmem */
 uint64_t        mem_actual;
 
 uint64_t       max_mem;        /* Size of physical memory (bytes), adjusted by maxmem */
 uint64_t        mem_actual;

-uint64_t       sane_size = 0;  /* Memory size to use for defaults calculations */
-
-#define MAXBOUNCEPOOL  (128 * 1024 * 1024)
-#define MAXLORESERVE   ( 32 * 1024 * 1024)
-
-extern int bsd_mbuf_cluster_reserve(void);
-
+uint64_t       sane_size = 0;  /* Memory size for defaults calculations */

 
 

-uint32_t       bounce_pool_base = 0;
-uint32_t       bounce_pool_size = 0;
-
-static void    reserve_bouncepool(uint32_t);
-
-
-pmap_paddr_t   avail_start, avail_end;
+/*
+ * KASLR parameters
+ */
+ppnum_t                vm_kernel_base_page;
+vm_offset_t    vm_kernel_base;
+vm_offset_t    vm_kernel_top;
+vm_offset_t    vm_kernel_stext;
+vm_offset_t    vm_kernel_etext;
+vm_offset_t    vm_kernel_slide;
+vm_offset_t    vm_kernel_slid_base;
+vm_offset_t    vm_kernel_slid_top;
+vm_offset_t vm_hib_base;
+vm_offset_t    vm_kext_base = VM_MIN_KERNEL_AND_KEXT_ADDRESS;
+vm_offset_t    vm_kext_top = VM_MIN_KERNEL_ADDRESS;
+
+vm_offset_t vm_prelink_stext;
+vm_offset_t vm_prelink_etext;
+vm_offset_t vm_prelink_sinfo;
+vm_offset_t vm_prelink_einfo;
+vm_offset_t vm_slinkedit;
+vm_offset_t vm_elinkedit;
+
+vm_offset_t vm_kernel_builtinkmod_text;
+vm_offset_t vm_kernel_builtinkmod_text_end;
+
+#define MAXLORESERVE   (32 * 1024 * 1024)
+
+ppnum_t                max_ppnum = 0;
+ppnum_t                lowest_lo = 0;
+ppnum_t                lowest_hi = 0;
+ppnum_t                highest_hi = 0;
+
+enum {PMAP_MAX_RESERVED_RANGES = 32};
+uint32_t pmap_reserved_pages_allocated = 0;
+uint32_t pmap_reserved_range_indices[PMAP_MAX_RESERVED_RANGES];
+uint32_t pmap_last_reserved_range_index = 0;
+uint32_t pmap_reserved_ranges = 0;
+
+extern unsigned int bsd_mbuf_cluster_reserve(boolean_t *);
+
+pmap_paddr_t     avail_start, avail_end;

 vm_offset_t    virtual_avail, virtual_end;
 static pmap_paddr_t    avail_remaining;
 vm_offset_t     static_memory_end = 0;
 
 vm_offset_t    virtual_avail, virtual_end;
 static pmap_paddr_t    avail_remaining;
 vm_offset_t     static_memory_end = 0;
 

-#include       <mach-o/loader.h>
-vm_offset_t    edata, etext, end;
+vm_offset_t    sHIB, eHIB, stext, etext, sdata, edata, end, sconst, econst;

 
 /*
 
 /*

- * _mh_execute_header is the mach_header for the currently executing
- * 32 bit kernel
+ * _mh_execute_header is the mach_header for the currently executing kernel

  */
  */

-extern struct mach_header _mh_execute_header;
-void *sectTEXTB; int sectSizeTEXT;
-void *sectDATAB; int sectSizeDATA;
-void *sectOBJCB; int sectSizeOBJC;
-void *sectLINKB; int sectSizeLINK;
-void *sectPRELINKB; int sectSizePRELINK;
-void *sectHIBB; int sectSizeHIB;
+vm_offset_t segTEXTB; unsigned long segSizeTEXT;
+vm_offset_t segDATAB; unsigned long segSizeDATA;
+vm_offset_t segLINKB; unsigned long segSizeLINK;
+vm_offset_t segPRELINKTEXTB; unsigned long segSizePRELINKTEXT;
+vm_offset_t segPRELINKINFOB; unsigned long segSizePRELINKINFO;
+vm_offset_t segHIBB; unsigned long segSizeHIB;
+unsigned long segSizeConst;
+
+static kernel_segment_command_t *segTEXT, *segDATA;
+static kernel_section_t *cursectTEXT, *lastsectTEXT;
+static kernel_segment_command_t *segCONST;
+
+extern uint64_t firmware_Conventional_bytes;
+extern uint64_t firmware_RuntimeServices_bytes;
+extern uint64_t firmware_ACPIReclaim_bytes;
+extern uint64_t firmware_ACPINVS_bytes;
+extern uint64_t firmware_PalCode_bytes;
+extern uint64_t firmware_Reserved_bytes;
+extern uint64_t firmware_Unusable_bytes;
+extern uint64_t firmware_other_bytes;
+uint64_t firmware_MMIO_bytes;

 
 

-extern void *getsegdatafromheader(struct mach_header *, const char *, int *);
-extern struct segment_command *getsegbyname(const char *);
-extern struct section *firstsect(struct segment_command *);
-extern struct section *nextsect(struct segment_command *, struct section *);
+/*
+ * Linker magic to establish the highest address in the kernel.
+ */
+extern void    *last_kernel_symbol;

 
 

+boolean_t      memmap = FALSE;
+#if    DEBUG || DEVELOPMENT
+static void
+kprint_memmap(vm_offset_t maddr, unsigned int msize, unsigned int mcount) {
+    unsigned int         i;
+    unsigned int         j;
+    pmap_memory_region_t *p = pmap_memory_regions;
+    EfiMemoryRange       *mptr; 
+    addr64_t             region_start, region_end;
+    addr64_t             efi_start, efi_end;
+
+    for (j = 0; j < pmap_memory_region_count; j++, p++) {
+        kprintf("pmap region %d type %d base 0x%llx alloc_up 0x%llx alloc_down 0x%llx top 0x%llx\n",
+            j, p->type,
+            (addr64_t) p->base  << I386_PGSHIFT,
+            (addr64_t) p->alloc_up << I386_PGSHIFT,
+            (addr64_t) p->alloc_down << I386_PGSHIFT,
+            (addr64_t) p->end   << I386_PGSHIFT);
+        region_start = (addr64_t) p->base << I386_PGSHIFT;
+        region_end = ((addr64_t) p->end << I386_PGSHIFT) - 1;
+        mptr = (EfiMemoryRange *) maddr; 
+        for (i = 0; 
+             i < mcount;
+             i++, mptr = (EfiMemoryRange *)(((vm_offset_t)mptr) + msize)) {
+            if (mptr->Type != kEfiLoaderCode &&
+                mptr->Type != kEfiLoaderData &&
+                mptr->Type != kEfiBootServicesCode &&
+                mptr->Type != kEfiBootServicesData &&
+                mptr->Type != kEfiConventionalMemory) {
+                efi_start = (addr64_t)mptr->PhysicalStart;
+                efi_end = efi_start + ((vm_offset_t)mptr->NumberOfPages << I386_PGSHIFT) - 1;
+                if ((efi_start >= region_start && efi_start <= region_end) ||
+                    (efi_end >= region_start && efi_end <= region_end)) {
+                    kprintf(" *** Overlapping region with EFI runtime region %d\n", i);
+                }
+            }
+        }
+    }
+}
+#define DPRINTF(x...)  do { if (memmap) kprintf(x); } while (0)

 
 

-void
-i386_macho_zerofill(void)
-{
-       struct segment_command  *sgp;
-       struct section          *sp;
-
-       sgp = getsegbyname("__DATA");
-       if (sgp) {
-               sp = firstsect(sgp);
-               if (sp) {
-                       do {
-                               if ((sp->flags & S_ZEROFILL))
-                                       bzero((char *) sp->addr, sp->size);
-                       } while ((sp = nextsect(sgp, sp)));
-               }
-       }
+#else

 
 

-       return;
+static void
+kprint_memmap(vm_offset_t maddr, unsigned int msize, unsigned int mcount) {
+#pragma unused(maddr, msize, mcount)

 }
 
 }
 

+#define DPRINTF(x...)
+#endif /* DEBUG */
+

 /*
  * Basic VM initialization.
  */
 /*
  * Basic VM initialization.
  */


@@ -155,35 +232,137 @@ i386_vm_init(uint64_t    maxmem,
        EfiMemoryRange *mptr;
         unsigned int mcount;
         unsigned int msize;
        EfiMemoryRange *mptr;
         unsigned int mcount;
         unsigned int msize;

+       vm_offset_t maddr;

        ppnum_t fap;
        unsigned int i;
        ppnum_t fap;
        unsigned int i;

-       unsigned int safeboot;

        ppnum_t maxpg = 0;
         uint32_t pmap_type;
        ppnum_t maxpg = 0;
         uint32_t pmap_type;

-       uint32_t maxbouncepoolsize;

        uint32_t maxloreserve;
        uint32_t maxdmaaddr;
        uint32_t maxloreserve;
        uint32_t maxdmaaddr;

+       uint32_t  mbuf_reserve = 0;
+       boolean_t mbuf_override = FALSE;
+       boolean_t coalescing_permitted;
+       vm_kernel_base_page = i386_btop(args->kaddr);
+       vm_offset_t base_address;
+       vm_offset_t static_base_address;
+    
+       PE_parse_boot_argn("memmap", &memmap, sizeof(memmap));
+
+       /*
+        * Establish the KASLR parameters.
+        */
+       static_base_address = ml_static_ptovirt(KERNEL_BASE_OFFSET);
+       base_address        = ml_static_ptovirt(args->kaddr);
+       vm_kernel_slide     = base_address - static_base_address;
+       if (args->kslide) {
+               kprintf("KASLR slide: 0x%016lx dynamic\n", vm_kernel_slide);
+               if (vm_kernel_slide != ((vm_offset_t)args->kslide))
+                       panic("Kernel base inconsistent with slide - rebased?");
+       } else {
+               /* No slide relative to on-disk symbols */
+               kprintf("KASLR slide: 0x%016lx static and ignored\n",
+                       vm_kernel_slide);
+               vm_kernel_slide = 0;
+       }
+
+       /*
+        * Zero out local relocations to avoid confusing kxld.
+        * TODO: might be better to move this code to OSKext::initialize
+        */
+       if (_mh_execute_header.flags & MH_PIE) {
+               struct load_command *loadcmd;
+               uint32_t cmd;
+
+               loadcmd = (struct load_command *)((uintptr_t)&_mh_execute_header +
+                                                 sizeof (_mh_execute_header));
+
+               for (cmd = 0; cmd < _mh_execute_header.ncmds; cmd++) {
+                       if (loadcmd->cmd == LC_DYSYMTAB) {
+                               struct dysymtab_command *dysymtab;
+
+                               dysymtab = (struct dysymtab_command *)loadcmd;
+                               dysymtab->nlocrel = 0;
+                               dysymtab->locreloff = 0;
+                               kprintf("Hiding local relocations\n");
+                               break;
+                       }
+                       loadcmd = (struct load_command *)((uintptr_t)loadcmd + loadcmd->cmdsize);
+               }
+       }

 
        /*
         * Now retrieve addresses for end, edata, and etext 
         * from MACH-O headers.
         */
 
        /*
         * Now retrieve addresses for end, edata, and etext 
         * from MACH-O headers.
         */

+       segTEXTB = (vm_offset_t) getsegdatafromheader(&_mh_execute_header,
+                                       "__TEXT", &segSizeTEXT);
+       segDATAB = (vm_offset_t) getsegdatafromheader(&_mh_execute_header,
+                                       "__DATA", &segSizeDATA);
+       segLINKB = (vm_offset_t) getsegdatafromheader(&_mh_execute_header,
+                                       "__LINKEDIT", &segSizeLINK);
+       segHIBB  = (vm_offset_t) getsegdatafromheader(&_mh_execute_header,
+                                       "__HIB", &segSizeHIB);
+       segPRELINKTEXTB = (vm_offset_t) getsegdatafromheader(&_mh_execute_header,
+                                               "__PRELINK_TEXT", &segSizePRELINKTEXT);
+       segPRELINKINFOB = (vm_offset_t) getsegdatafromheader(&_mh_execute_header,
+                                               "__PRELINK_INFO", &segSizePRELINKINFO);
+       segTEXT = getsegbynamefromheader(&_mh_execute_header,
+                                       "__TEXT");
+       segDATA = getsegbynamefromheader(&_mh_execute_header,
+                                       "__DATA");
+       segCONST = getsegbynamefromheader(&_mh_execute_header,
+                                       "__CONST");
+       cursectTEXT = lastsectTEXT = firstsect(segTEXT);
+       /* Discover the last TEXT section within the TEXT segment */
+       while ((cursectTEXT = nextsect(segTEXT, cursectTEXT)) != NULL) {
+               lastsectTEXT = cursectTEXT;
+       }

 
 

-       sectTEXTB = (void *) getsegdatafromheader(
-               &_mh_execute_header, "__TEXT", &sectSizeTEXT);
-       sectDATAB = (void *) getsegdatafromheader(
-               &_mh_execute_header, "__DATA", &sectSizeDATA);
-       sectOBJCB = (void *) getsegdatafromheader(
-               &_mh_execute_header, "__OBJC", &sectSizeOBJC);
-       sectLINKB = (void *) getsegdatafromheader(
-               &_mh_execute_header, "__LINKEDIT", &sectSizeLINK);
-       sectHIBB = (void *)getsegdatafromheader(
-               &_mh_execute_header, "__HIB", &sectSizeHIB);
-       sectPRELINKB = (void *) getsegdatafromheader(
-               &_mh_execute_header, "__PRELINK", &sectSizePRELINK);
-
-       etext = (vm_offset_t) sectTEXTB + sectSizeTEXT;
-       edata = (vm_offset_t) sectDATAB + sectSizeDATA;
+       sHIB  = segHIBB;
+       eHIB  = segHIBB + segSizeHIB;
+       vm_hib_base = sHIB;
+       /* Zero-padded from ehib to stext if text is 2M-aligned */
+       stext = segTEXTB;
+       lowGlo.lgStext = stext;
+       etext = (vm_offset_t) round_page_64(lastsectTEXT->addr + lastsectTEXT->size);
+       /* Zero-padded from etext to sdata if text is 2M-aligned */
+       sdata = segDATAB;
+       edata = segDATAB + segSizeDATA;
+
+       sconst = segCONST->vmaddr;
+       segSizeConst = segCONST->vmsize;
+       econst = sconst + segSizeConst;
+
+       assert(((sconst|econst) & PAGE_MASK) == 0);
+       
+       DPRINTF("segTEXTB    = %p\n", (void *) segTEXTB);
+       DPRINTF("segDATAB    = %p\n", (void *) segDATAB);
+       DPRINTF("segLINKB    = %p\n", (void *) segLINKB);
+       DPRINTF("segHIBB     = %p\n", (void *) segHIBB);
+       DPRINTF("segPRELINKTEXTB = %p\n", (void *) segPRELINKTEXTB);
+       DPRINTF("segPRELINKINFOB = %p\n", (void *) segPRELINKINFOB);
+       DPRINTF("sHIB        = %p\n", (void *) sHIB);
+       DPRINTF("eHIB        = %p\n", (void *) eHIB);
+       DPRINTF("stext       = %p\n", (void *) stext);
+       DPRINTF("etext       = %p\n", (void *) etext);
+       DPRINTF("sdata       = %p\n", (void *) sdata);
+       DPRINTF("edata       = %p\n", (void *) edata);
+       DPRINTF("sconst      = %p\n", (void *) sconst);
+       DPRINTF("econst      = %p\n", (void *) econst);
+       DPRINTF("kernel_top  = %p\n", (void *) &last_kernel_symbol);
+
+       vm_kernel_base  = sHIB;
+       vm_kernel_top   = (vm_offset_t) &last_kernel_symbol;
+       vm_kernel_stext = stext;
+       vm_kernel_etext = etext;
+       vm_prelink_stext = segPRELINKTEXTB;
+       vm_prelink_etext = segPRELINKTEXTB + segSizePRELINKTEXT;
+       vm_prelink_sinfo = segPRELINKINFOB;
+       vm_prelink_einfo = segPRELINKINFOB + segSizePRELINKINFO;
+       vm_slinkedit = segLINKB;
+       vm_elinkedit = segLINKB + segSizeLINK;
+       vm_kernel_slid_base = vm_kext_base + vm_kernel_slide;
+       vm_kernel_slid_top = vm_prelink_einfo;

 
        vm_set_page_size();
 
 
        vm_set_page_size();
 


@@ -191,9 +370,6 @@ i386_vm_init(uint64_t       maxmem,
         * Compute the memory size.
         */
 
         * Compute the memory size.
         */
 

-       if ((1 == vm_himemory_mode) || PE_parse_boot_arg("-x", &safeboot)) {
-               maxpg = 1 << (32 - I386_PGSHIFT);
-       }

        avail_remaining = 0;
        avail_end = 0;
        pmptr = pmap_memory_regions;
        avail_remaining = 0;
        avail_end = 0;
        pmptr = pmap_memory_regions;


@@ -201,23 +377,60 @@ i386_vm_init(uint64_t     maxmem,
        pmap_memory_region_count = pmap_memory_region_current = 0;
        fap = (ppnum_t) i386_btop(first_avail);
 
        pmap_memory_region_count = pmap_memory_region_current = 0;
        fap = (ppnum_t) i386_btop(first_avail);
 

-       mptr = (EfiMemoryRange *)args->MemoryMap;
+       maddr = ml_static_ptovirt((vm_offset_t)args->MemoryMap);
+       mptr = (EfiMemoryRange *)maddr;

         if (args->MemoryMapDescriptorSize == 0)
                panic("Invalid memory map descriptor size");
         msize = args->MemoryMapDescriptorSize;
         mcount = args->MemoryMapSize / msize;
 
 #define FOURGIG 0x0000000100000000ULL
         if (args->MemoryMapDescriptorSize == 0)
                panic("Invalid memory map descriptor size");
         msize = args->MemoryMapDescriptorSize;
         mcount = args->MemoryMapSize / msize;
 
 #define FOURGIG 0x0000000100000000ULL

+#define ONEGIG  0x0000000040000000ULL

 
        for (i = 0; i < mcount; i++, mptr = (EfiMemoryRange *)(((vm_offset_t)mptr) + msize)) {
                ppnum_t base, top;
 
        for (i = 0; i < mcount; i++, mptr = (EfiMemoryRange *)(((vm_offset_t)mptr) + msize)) {
                ppnum_t base, top;

+               uint64_t region_bytes = 0;

 
                if (pmap_memory_region_count >= PMAP_MEMORY_REGIONS_SIZE) {
                        kprintf("WARNING: truncating memory region count at %d\n", pmap_memory_region_count);
                        break;
                }
                base = (ppnum_t) (mptr->PhysicalStart >> I386_PGSHIFT);
 
                if (pmap_memory_region_count >= PMAP_MEMORY_REGIONS_SIZE) {
                        kprintf("WARNING: truncating memory region count at %d\n", pmap_memory_region_count);
                        break;
                }
                base = (ppnum_t) (mptr->PhysicalStart >> I386_PGSHIFT);

-               top = (ppnum_t) ((mptr->PhysicalStart) >> I386_PGSHIFT) + mptr->NumberOfPages - 1;
+               top = (ppnum_t) (((mptr->PhysicalStart) >> I386_PGSHIFT) + mptr->NumberOfPages - 1);
+
+               if (base == 0) {
+                       /*
+                        * Avoid having to deal with the edge case of the 
+                        * very first possible physical page and the roll-over
+                        * to -1; just ignore that page.
+                        */
+                       kprintf("WARNING: ignoring first page in [0x%llx:0x%llx]\n", (uint64_t) base, (uint64_t) top);
+                       base++;
+               }
+               if (top + 1 == 0) {
+                       /*
+                        * Avoid having to deal with the edge case of the 
+                        * very last possible physical page and the roll-over
+                        * to 0; just ignore that page.
+                        */
+                       kprintf("WARNING: ignoring last page in [0x%llx:0x%llx]\n", (uint64_t) base, (uint64_t) top);
+                       top--;
+               }
+               if (top < base) {
+                       /*
+                        * That was the only page in that region, so
+                        * ignore the whole region.
+                        */
+                       continue;
+               }
+
+#if    MR_RSV_TEST
+               static uint32_t nmr = 0;
+               if ((base > 0x20000) && (nmr++ < 4))
+                       mptr->Attribute |= EFI_MEMORY_KERN_RESERVED;
+#endif
+               region_bytes = (uint64_t)(mptr->NumberOfPages << I386_PGSHIFT);
+               pmap_type = mptr->Type;

 
                switch (mptr->Type) {
                case kEfiLoaderCode:
 
                switch (mptr->Type) {
                case kEfiLoaderCode:


@@ -229,31 +442,56 @@ i386_vm_init(uint64_t     maxmem,
                         * Consolidate usable memory types into one.
                         */
                        pmap_type = kEfiConventionalMemory;
                         * Consolidate usable memory types into one.
                         */
                        pmap_type = kEfiConventionalMemory;

-                       sane_size += (uint64_t)(mptr->NumberOfPages << I386_PGSHIFT);
+                       sane_size += region_bytes;
+                       firmware_Conventional_bytes += region_bytes;

                        break;
                        break;

+                       /*
+                        * sane_size should reflect the total amount of physical
+                        * RAM in the system, not just the amount that is
+                        * available for the OS to use.
+                        * We now get this value from SMBIOS tables
+                        * rather than reverse engineering the memory map.
+                        * But the legacy computation of "sane_size" is kept
+                        * for diagnostic information.
+                        */

 
                case kEfiRuntimeServicesCode:
                case kEfiRuntimeServicesData:
 
                case kEfiRuntimeServicesCode:
                case kEfiRuntimeServicesData:

+                       firmware_RuntimeServices_bytes += region_bytes;
+                       sane_size += region_bytes;
+                       break;

                case kEfiACPIReclaimMemory:
                case kEfiACPIReclaimMemory:

+                       firmware_ACPIReclaim_bytes += region_bytes;
+                       sane_size += region_bytes;
+                       break;

                case kEfiACPIMemoryNVS:
                case kEfiACPIMemoryNVS:

+                       firmware_ACPINVS_bytes += region_bytes;
+                       sane_size += region_bytes;
+                       break;

                case kEfiPalCode:
                case kEfiPalCode:

-                       /*
-                        * sane_size should reflect the total amount of physical ram
-                        * in the system, not just the amount that is available for
-                        * the OS to use
-                        */
-                       sane_size += (uint64_t)(mptr->NumberOfPages << I386_PGSHIFT);
-                       /* fall thru */
+                       firmware_PalCode_bytes += region_bytes;
+                       sane_size += region_bytes;
+                       break;

 
 

+               case kEfiReservedMemoryType:
+                       firmware_Reserved_bytes += region_bytes;
+                       break;

                case kEfiUnusableMemory:
                case kEfiUnusableMemory:

+                       firmware_Unusable_bytes += region_bytes;
+                       break;

                case kEfiMemoryMappedIO:
                case kEfiMemoryMappedIOPortSpace:
                case kEfiMemoryMappedIO:
                case kEfiMemoryMappedIOPortSpace:

-               case kEfiReservedMemoryType:
+                       firmware_MMIO_bytes += region_bytes;
+                       break;

                default:
                default:

-                       pmap_type = mptr->Type;
+                       firmware_other_bytes += region_bytes;
+                       break;

                }
 
                }
 

-               kprintf("EFI region: type = %d/%d,  base = 0x%x,  top = 0x%x\n", mptr->Type, pmap_type, base, top);
+               DPRINTF("EFI region %d: type %u/%d, base 0x%x, top 0x%x %s\n",
+                   i, mptr->Type, pmap_type, base, top,
+                   (mptr->Attribute&EFI_MEMORY_KERN_RESERVED)? "RESERVED" :
+                   (mptr->Attribute&EFI_MEMORY_RUNTIME)? "RUNTIME" : "");

 
                if (maxpg) {
                        if (base >= maxpg)
 
                if (maxpg) {
                        if (base >= maxpg)


@@ -264,21 +502,32 @@ i386_vm_init(uint64_t     maxmem,
                /*
                 * handle each region
                 */
                /*
                 * handle each region
                 */

-               if (kEfiACPIMemoryNVS == pmap_type) {
-                       prev_pmptr = 0;
-                       continue;
-               } else if ((mptr->Attribute & EFI_MEMORY_RUNTIME) == EFI_MEMORY_RUNTIME ||
-                          pmap_type != kEfiConventionalMemory) {
+               if ((mptr->Attribute & EFI_MEMORY_RUNTIME) == EFI_MEMORY_RUNTIME ||
+                   pmap_type != kEfiConventionalMemory) {

                        prev_pmptr = 0;
                        continue;
                } else {
                        /*
                         * Usable memory region
                         */
                        prev_pmptr = 0;
                        continue;
                } else {
                        /*
                         * Usable memory region
                         */

-                       if (top < I386_LOWMEM_RESERVED) {
+                       if (top < I386_LOWMEM_RESERVED ||
+                           !pal_is_usable_memory(base, top)) {

                                prev_pmptr = 0;
                                continue;
                        }
                                prev_pmptr = 0;
                                continue;
                        }

+                       /*
+                        * A range may be marked with with the
+                        * EFI_MEMORY_KERN_RESERVED attribute
+                        * on some systems, to indicate that the range
+                        * must not be made available to devices.
+                        */
+
+                       if (mptr->Attribute & EFI_MEMORY_KERN_RESERVED) {
+                               if (++pmap_reserved_ranges > PMAP_MAX_RESERVED_RANGES) {
+                                       panic("Too many reserved ranges %u\n", pmap_reserved_ranges);
+                               }
+                       }
+

                        if (top < fap) {
                                /*
                                 * entire range below first_avail
                        if (top < fap) {
                                /*
                                 * entire range below first_avail


@@ -290,11 +539,25 @@ i386_vm_init(uint64_t     maxmem,
                                        pmptr->base = base;
                                else
                                        pmptr->base = I386_LOWMEM_RESERVED;
                                        pmptr->base = base;
                                else
                                        pmptr->base = I386_LOWMEM_RESERVED;

-                               /*
-                                * mark as already mapped
-                                */
-                               pmptr->alloc = pmptr->end = top;
+
+                               pmptr->end = top;
+
+
+                               if ((mptr->Attribute & EFI_MEMORY_KERN_RESERVED) &&
+                                   (top < vm_kernel_base_page)) {
+                                       pmptr->alloc_up = pmptr->base;
+                                       pmptr->alloc_down = pmptr->end;
+                                       pmap_reserved_range_indices[pmap_last_reserved_range_index++] = pmap_memory_region_count;
+                               }
+                               else {
+                                       /*
+                                        * mark as already mapped
+                                        */
+                                       pmptr->alloc_up = top + 1;
+                                       pmptr->alloc_down = top;
+                               }

                                pmptr->type = pmap_type;
                                pmptr->type = pmap_type;

+                               pmptr->attribute = mptr->Attribute;

                        }
                        else if ( (base < fap) && (top > fap) ) {
                                /*
                        }
                        else if ( (base < fap) && (top > fap) ) {
                                /*


@@ -303,40 +566,54 @@ i386_vm_init(uint64_t     maxmem,
                                 * mark already allocated
                                 */
                                pmptr->base = base;
                                 * mark already allocated
                                 */
                                pmptr->base = base;

-                               pmptr->alloc = pmptr->end = (fap - 1);
+                               pmptr->end = (fap - 1);
+                               pmptr->alloc_up = pmptr->end + 1;
+                               pmptr->alloc_down = pmptr->end;

                                pmptr->type = pmap_type;
                                pmptr->type = pmap_type;

+                               pmptr->attribute = mptr->Attribute;

                                /*
                                 * we bump these here inline so the accounting
                                 * below works correctly
                                 */
                                pmptr++;
                                pmap_memory_region_count++;
                                /*
                                 * we bump these here inline so the accounting
                                 * below works correctly
                                 */
                                pmptr++;
                                pmap_memory_region_count++;

-                               pmptr->alloc = pmptr->base = fap;
+
+                               pmptr->alloc_up = pmptr->base = fap;

                                pmptr->type = pmap_type;
                                pmptr->type = pmap_type;

-                               pmptr->end = top;
-                       }
-                       else {
+                               pmptr->attribute = mptr->Attribute;
+                               pmptr->alloc_down = pmptr->end = top;
+
+                               if (mptr->Attribute & EFI_MEMORY_KERN_RESERVED)
+                                       pmap_reserved_range_indices[pmap_last_reserved_range_index++] = pmap_memory_region_count;
+                       } else {

                                /*
                                 * entire range useable
                                 */
                                /*
                                 * entire range useable
                                 */

-                               pmptr->alloc = pmptr->base = base;
+                               pmptr->alloc_up = pmptr->base = base;

                                pmptr->type = pmap_type;
                                pmptr->type = pmap_type;

-                               pmptr->end = top;
+                               pmptr->attribute = mptr->Attribute;
+                               pmptr->alloc_down = pmptr->end = top;
+                               if (mptr->Attribute & EFI_MEMORY_KERN_RESERVED)
+                                       pmap_reserved_range_indices[pmap_last_reserved_range_index++] = pmap_memory_region_count;

                        }
 
                        if (i386_ptob(pmptr->end) > avail_end )
                                avail_end = i386_ptob(pmptr->end);
 
                        avail_remaining += (pmptr->end - pmptr->base);
                        }
 
                        if (i386_ptob(pmptr->end) > avail_end )
                                avail_end = i386_ptob(pmptr->end);
 
                        avail_remaining += (pmptr->end - pmptr->base);

-
+                       coalescing_permitted = (prev_pmptr && (pmptr->attribute == prev_pmptr->attribute) && ((pmptr->attribute & EFI_MEMORY_KERN_RESERVED) == 0));

                        /*
                         * Consolidate contiguous memory regions, if possible
                         */
                        if (prev_pmptr &&
                        /*
                         * Consolidate contiguous memory regions, if possible
                         */
                        if (prev_pmptr &&

-                           pmptr->type == prev_pmptr->type &&
-                           pmptr->base == pmptr->alloc &&
-                           pmptr->base == (prev_pmptr->end + 1)) {
-                               prev_pmptr->end = pmptr->end;
+                           (pmptr->type == prev_pmptr->type) &&
+                           (coalescing_permitted) &&
+                           (pmptr->base == pmptr->alloc_up) &&
+                           (prev_pmptr->end == prev_pmptr->alloc_down) &&
+                           (pmptr->base == (prev_pmptr->end + 1)))
+                       {
+                               prev_pmptr->end = pmptr->end;
+                               prev_pmptr->alloc_down = pmptr->alloc_down;

                        } else {
                                pmap_memory_region_count++;
                                prev_pmptr = pmptr;
                        } else {
                                pmap_memory_region_count++;
                                prev_pmptr = pmptr;


@@ -345,60 +622,73 @@ i386_vm_init(uint64_t     maxmem,
                }
        }
 
                }
        }
 

-
-#ifdef PRINT_PMAP_MEMORY_TABLE
-       {
-        unsigned int j;
-        pmap_memory_region_t *p = pmap_memory_regions;
-        vm_offset_t region_start, region_end;
-        vm_offset_t efi_start, efi_end;
-        for (j=0;j<pmap_memory_region_count;j++, p++) {
-            kprintf("type %d base 0x%x alloc 0x%x top 0x%x\n", p->type,
-                    p->base << I386_PGSHIFT, p->alloc << I386_PGSHIFT, p->end << I386_PGSHIFT);
-            region_start = p->base << I386_PGSHIFT;
-            region_end = (p->end << I386_PGSHIFT) - 1;
-            mptr = args->MemoryMap;
-            for (i=0; i<mcount; i++, mptr = (EfiMemoryRange *)(((vm_offset_t)mptr) + msize)) {
-                if (mptr->Type != kEfiLoaderCode &&
-                    mptr->Type != kEfiLoaderData &&
-                    mptr->Type != kEfiBootServicesCode &&
-                    mptr->Type != kEfiBootServicesData &&
-                    mptr->Type != kEfiConventionalMemory) {
-                efi_start = (vm_offset_t)mptr->PhysicalStart;
-                efi_end = efi_start + ((vm_offset_t)mptr->NumberOfPages << I386_PGSHIFT) - 1;
-                if ((efi_start >= region_start && efi_start <= region_end) ||
-                    (efi_end >= region_start && efi_end <= region_end)) {
-                    kprintf(" *** Overlapping region with EFI runtime region %d\n", i);
-                }
-                }
-                
-            }
-        }
+       if (memmap) {
+               kprint_memmap(maddr, msize, mcount);

        }
        }

-#endif

 
        avail_start = first_avail;
 
        avail_start = first_avail;

-       mem_actual = sane_size;
-
-#define MEG            (1024*1024)
+       mem_actual = args->PhysicalMemorySize;

 
        /*
 
        /*

-        * For user visible memory size, round up to 128 Mb - accounting for the various stolen memory
-        * not reported by EFI.
+        * For user visible memory size, round up to 128 Mb
+        * - accounting for the various stolen memory not reported by EFI.
+        * This is maintained for historical, comparison purposes but
+        * we now use the memory size reported by EFI/Booter.

         */
         */

+       sane_size = (sane_size + 128 * MB - 1) & ~((uint64_t)(128 * MB - 1));
+       if (sane_size != mem_actual)
+               printf("mem_actual: 0x%llx\n legacy sane_size: 0x%llx\n",
+                       mem_actual, sane_size);
+       sane_size = mem_actual;

 
 

-       sane_size = (sane_size + 128 * MEG - 1) & ~((uint64_t)(128 * MEG - 1));
+       /*
+        * We cap at KERNEL_MAXMEM bytes (currently 32GB for K32, 96GB for K64).
+        * Unless overriden by the maxmem= boot-arg
+        * -- which is a non-zero maxmem argument to this function.
+        */
+       if (maxmem == 0 && sane_size > KERNEL_MAXMEM) {
+               maxmem = KERNEL_MAXMEM;
+               printf("Physical memory %lld bytes capped at %dGB\n",
+                       sane_size, (uint32_t) (KERNEL_MAXMEM/GB));
+       }

 
        /*
         * if user set maxmem, reduce memory sizes
         */
        if ( (maxmem > (uint64_t)first_avail) && (maxmem < sane_size)) {
 
        /*
         * if user set maxmem, reduce memory sizes
         */
        if ( (maxmem > (uint64_t)first_avail) && (maxmem < sane_size)) {

-               ppnum_t discarded_pages  = (sane_size - maxmem) >> I386_PGSHIFT;
-               sane_size                = maxmem;
+               ppnum_t discarded_pages  = (ppnum_t)((sane_size - maxmem) >> I386_PGSHIFT);
+               ppnum_t highest_pn = 0;
+               ppnum_t cur_end  = 0;
+               uint64_t        pages_to_use;
+               unsigned        cur_region = 0;
+
+               sane_size = maxmem;
+

                if (avail_remaining > discarded_pages)
                        avail_remaining -= discarded_pages;
                else
                        avail_remaining = 0;
                if (avail_remaining > discarded_pages)
                        avail_remaining -= discarded_pages;
                else
                        avail_remaining = 0;

+               
+               pages_to_use = avail_remaining;
+
+               while (cur_region < pmap_memory_region_count && pages_to_use) {
+                       for (cur_end = pmap_memory_regions[cur_region].base;
+                            cur_end < pmap_memory_regions[cur_region].end && pages_to_use;
+                            cur_end++) {
+                               if (cur_end > highest_pn)
+                                       highest_pn = cur_end;
+                               pages_to_use--;
+                       }
+                       if (pages_to_use == 0) {
+                               pmap_memory_regions[cur_region].end = cur_end;
+                               pmap_memory_regions[cur_region].alloc_down = cur_end;
+                       }
+
+                       cur_region++;
+               }
+               pmap_memory_region_count = cur_region;
+
+               avail_end = i386_ptob(highest_pn + 1);

        }
 
        /*
        }
 
        /*


@@ -411,41 +701,54 @@ i386_vm_init(uint64_t     maxmem,
                mem_size = (vm_size_t)sane_size;
        max_mem = sane_size;
 
                mem_size = (vm_size_t)sane_size;
        max_mem = sane_size;
 

-       kprintf("Physical memory %d MB\n", sane_size/MEG);
+       kprintf("Physical memory %llu MB\n", sane_size/MB);

 
 

-       if (!PE_parse_boot_arg("max_valid_dma_addr", &maxdmaaddr))
-               max_valid_dma_address = 1024ULL * 1024ULL * 4096ULL;
-       else
-               max_valid_dma_address = ((uint64_t) maxdmaaddr) * 1024ULL * 1024ULL;
+       max_valid_low_ppnum = (2 * GB) / PAGE_SIZE;

 
 

-       if (!PE_parse_boot_arg("maxbouncepool", &maxbouncepoolsize))
-               maxbouncepoolsize = MAXBOUNCEPOOL;
-       else
-               maxbouncepoolsize = maxbouncepoolsize * (1024 * 1024);
+       if (!PE_parse_boot_argn("max_valid_dma_addr", &maxdmaaddr, sizeof (maxdmaaddr))) {
+               max_valid_dma_address = (uint64_t)4 * (uint64_t)GB;
+       } else {
+               max_valid_dma_address = ((uint64_t) maxdmaaddr) * MB;

 
 

-       /*
-        * bsd_mbuf_cluster_reserve depends on sane_size being set
-        * in order to correctly determine the size of the mbuf pool
-        * that will be reserved
-        */
-       if (!PE_parse_boot_arg("maxloreserve", &maxloreserve))
-               maxloreserve = MAXLORESERVE + bsd_mbuf_cluster_reserve();
-       else
-               maxloreserve = maxloreserve * (1024 * 1024);
+               if ((max_valid_dma_address / PAGE_SIZE) < max_valid_low_ppnum)
+                       max_valid_low_ppnum = (ppnum_t)(max_valid_dma_address / PAGE_SIZE);
+       }
+       if (avail_end >= max_valid_dma_address) {

 
 

+               if (!PE_parse_boot_argn("maxloreserve", &maxloreserve, sizeof (maxloreserve))) {

 
 

-       if (avail_end >= max_valid_dma_address) {
-               if (maxbouncepoolsize)
-                       reserve_bouncepool(maxbouncepoolsize);
+                       if (sane_size >= (ONEGIG * 15))
+                               maxloreserve = (MAXLORESERVE / PAGE_SIZE) * 4;
+                       else if (sane_size >= (ONEGIG * 7))
+                               maxloreserve = (MAXLORESERVE / PAGE_SIZE) * 2;
+                       else
+                               maxloreserve = MAXLORESERVE / PAGE_SIZE;

 
 

-               if (maxloreserve)
-                       vm_lopage_poolsize = maxloreserve / PAGE_SIZE;
+#if SOCKETS
+                       mbuf_reserve = bsd_mbuf_cluster_reserve(&mbuf_override) / PAGE_SIZE;
+#endif
+               } else
+                       maxloreserve = (maxloreserve * (1024 * 1024)) / PAGE_SIZE;
+
+               if (maxloreserve) {
+                       vm_lopage_free_limit = maxloreserve;
+                       
+                       if (mbuf_override == TRUE) {
+                               vm_lopage_free_limit += mbuf_reserve;
+                               vm_lopage_lowater = 0;
+                       } else
+                               vm_lopage_lowater = vm_lopage_free_limit / 16;
+
+                       vm_lopage_refill = TRUE;
+                       vm_lopage_needed = TRUE;
+               }

        }
        }

-
+       

        /*
         *      Initialize kernel physical map.
         *      Kernel virtual address starts at VM_KERNEL_MIN_ADDRESS.
         */
        /*
         *      Initialize kernel physical map.
         *      Kernel virtual address starts at VM_KERNEL_MIN_ADDRESS.
         */

+       kprintf("avail_remaining = 0x%lx\n", (unsigned long)avail_remaining);

        pmap_bootstrap(0, IA32e);
 }
 
        pmap_bootstrap(0, IA32e);
 }
 


@@ -453,7 +756,83 @@ i386_vm_init(uint64_t      maxmem,
 unsigned int
 pmap_free_pages(void)
 {
 unsigned int
 pmap_free_pages(void)
 {

-       return avail_remaining;
+       return (unsigned int)avail_remaining;
+}
+
+
+boolean_t pmap_next_page_reserved(ppnum_t *);
+
+/*
+ * Pick a page from a "kernel private" reserved range; works around
+ * errata on some hardware.
+ */
+boolean_t
+pmap_next_page_reserved(ppnum_t *pn) {
+       if (pmap_reserved_ranges) {
+               uint32_t n;
+               pmap_memory_region_t *region;
+               for (n = 0; n < pmap_last_reserved_range_index; n++) {
+                       uint32_t reserved_index = pmap_reserved_range_indices[n];
+                       region = &pmap_memory_regions[reserved_index];
+                       if (region->alloc_up <= region->alloc_down) {
+                               *pn = region->alloc_up++;
+                               avail_remaining--;
+
+                               if (*pn > max_ppnum)
+                                       max_ppnum = *pn;
+
+                               if (lowest_lo == 0 || *pn < lowest_lo)
+                                       lowest_lo = *pn;
+
+                               pmap_reserved_pages_allocated++;
+#if DEBUG
+                               if (region->alloc_up > region->alloc_down) {
+                                       kprintf("Exhausted reserved range index: %u, base: 0x%x end: 0x%x, type: 0x%x, attribute: 0x%llx\n", reserved_index, region->base, region->end, region->type, region->attribute);
+                               }
+#endif
+                               return TRUE;
+                       }
+               }
+       }
+       return FALSE;
+}
+
+
+boolean_t
+pmap_next_page_hi(
+                 ppnum_t *pn)
+{
+       pmap_memory_region_t *region;
+       int     n;
+
+       if (pmap_next_page_reserved(pn))
+               return TRUE;
+
+       if (avail_remaining) {
+               for (n = pmap_memory_region_count - 1; n >= 0; n--) {
+                       region = &pmap_memory_regions[n];
+
+                       if (region->alloc_down >= region->alloc_up) {
+                               *pn = region->alloc_down--;
+                               avail_remaining--;
+
+                               if (*pn > max_ppnum)
+                                       max_ppnum = *pn;
+
+                                if (lowest_lo == 0 || *pn < lowest_lo)
+                                        lowest_lo = *pn;
+
+                                if (lowest_hi == 0 || *pn < lowest_hi)
+                                        lowest_hi = *pn;
+
+                                if (*pn > highest_hi)
+                                        highest_hi = *pn;
+
+                               return TRUE;
+                       }
+               }
+       }
+       return FALSE;

 }
 
 
 }
 
 


@@ -461,16 +840,21 @@ boolean_t
 pmap_next_page(
               ppnum_t *pn)
 {
 pmap_next_page(
               ppnum_t *pn)
 {

-       

        if (avail_remaining) while (pmap_memory_region_current < pmap_memory_region_count) {
        if (avail_remaining) while (pmap_memory_region_current < pmap_memory_region_count) {

-               if (pmap_memory_regions[pmap_memory_region_current].alloc ==
-                   pmap_memory_regions[pmap_memory_region_current].end) {
-                       pmap_memory_region_current++;
+               if (pmap_memory_regions[pmap_memory_region_current].alloc_up >
+                   pmap_memory_regions[pmap_memory_region_current].alloc_down) {
+                       pmap_memory_region_current++;

                        continue;
                }
                        continue;
                }

-               *pn = pmap_memory_regions[pmap_memory_region_current].alloc++;
+               *pn = pmap_memory_regions[pmap_memory_region_current].alloc_up++;

                avail_remaining--;
 
                avail_remaining--;
 

+               if (*pn > max_ppnum)
+                       max_ppnum = *pn;
+
+               if (lowest_lo == 0 || *pn < lowest_lo)
+                       lowest_lo = *pn;
+

                return TRUE;
        }
        return FALSE;
                return TRUE;
        }
        return FALSE;


@@ -484,36 +868,10 @@ pmap_valid_page(
         unsigned int i;
        pmap_memory_region_t *pmptr = pmap_memory_regions;
 
         unsigned int i;
        pmap_memory_region_t *pmptr = pmap_memory_regions;
 

-       assert(pn);

        for (i = 0; i < pmap_memory_region_count; i++, pmptr++) {
        for (i = 0; i < pmap_memory_region_count; i++, pmptr++) {

-                if ( (pn >= pmptr->base) && (pn <= pmptr->end) && pmptr->type == kEfiConventionalMemory )
+               if ( (pn >= pmptr->base) && (pn <= pmptr->end) )

                        return TRUE;
        }
        return FALSE;
 }
 
                        return TRUE;
        }
        return FALSE;
 }
 

-
-static void
-reserve_bouncepool(uint32_t bounce_pool_wanted)
-{
-       pmap_memory_region_t *pmptr  = pmap_memory_regions;
-       pmap_memory_region_t *lowest = NULL;
-        unsigned int i;
-       unsigned int pages_needed;
-
-       pages_needed = bounce_pool_wanted / PAGE_SIZE;
-
-       for (i = 0; i < pmap_memory_region_count; i++, pmptr++) {
-               if ( (pmptr->type == kEfiConventionalMemory) && ((pmptr->end - pmptr->alloc) >= pages_needed) ) {
-                       if ( (lowest == NULL) || (pmptr->alloc < lowest->alloc) )
-                               lowest = pmptr;
-               }
-       }
-       if ( (lowest != NULL) ) {
-               bounce_pool_base = lowest->alloc * PAGE_SIZE;
-               bounce_pool_size = bounce_pool_wanted;
-
-               lowest->alloc += pages_needed;
-               avail_remaining -= pages_needed;
-       }
-}