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Annotation of Gnu-Mach/i386/i386at/biosmem.h, revision 1.1.1.2

1.1       root        1: /*
                      2:  * Copyright (c) 2010-2014 Richard Braun.
                      3:  *
                      4:  * This program is free software: you can redistribute it and/or modify
                      5:  * it under the terms of the GNU General Public License as published by
                      6:  * the Free Software Foundation, either version 2 of the License, or
                      7:  * (at your option) any later version.
                      8:  *
                      9:  * This program is distributed in the hope that it will be useful,
                     10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
                     11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     12:  * GNU General Public License for more details.
                     13:  *
                     14:  * You should have received a copy of the GNU General Public License
                     15:  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
                     16:  */
                     17: 
                     18: #ifndef _X86_BIOSMEM_H
                     19: #define _X86_BIOSMEM_H
                     20: 
                     21: #include <mach/machine/vm_types.h>
                     22: #include <mach/machine/multiboot.h>
                     23: 
                     24: /*
                     25:  * Address where the address of the Extended BIOS Data Area segment can be
                     26:  * found.
                     27:  */
                     28: #define BIOSMEM_EBDA_PTR 0x40e
                     29: 
                     30: /*
                     31:  * Significant low memory addresses.
                     32:  *
                     33:  * The first 64 KiB are reserved for various reasons (e.g. to preserve BIOS
                     34:  * data and to work around data corruption on some hardware).
                     35:  */
                     36: #define BIOSMEM_BASE        0x010000
                     37: #define BIOSMEM_BASE_END    0x0a0000
                     38: #define BIOSMEM_EXT_ROM     0x0e0000
                     39: #define BIOSMEM_ROM         0x0f0000
                     40: #define BIOSMEM_END         0x100000
                     41: 
                     42: /*
1.1.1.2 ! root       43:  * Report reserved addresses to the biosmem module.
1.1       root       44:  *
1.1.1.2 ! root       45:  * Once all boot data have been registered, the user can set up the
        !            46:  * early page allocator.
1.1       root       47:  *
1.1.1.2 ! root       48:  * If the range is marked temporary, it will be unregistered when
        !            49:  * biosmem_free_usable() is called, so that pages that used to store
        !            50:  * these boot data may be released to the VM system.
        !            51:  */
        !            52: void biosmem_register_boot_data(phys_addr_t start, phys_addr_t end,
        !            53:                                 boolean_t temporary);
        !            54: 
        !            55: /*
        !            56:  * Initialize the early page allocator.
        !            57:  *
        !            58:  * This function uses the memory map provided by the boot loader along
        !            59:  * with the registered boot data addresses to set up a heap of free pages
        !            60:  * of physical memory.
        !            61:  *
        !            62:  * Note that on Xen, this function registers all the Xen boot information
        !            63:  * as boot data itself.
1.1       root       64:  */
                     65: #ifdef MACH_HYP
                     66: void biosmem_xen_bootstrap(void);
                     67: #else /* MACH_HYP */
1.1.1.2 ! root       68: void biosmem_bootstrap(const struct multiboot_raw_info *mbi);
1.1       root       69: #endif /* MACH_HYP */
                     70: 
                     71: /*
                     72:  * Allocate contiguous physical pages during bootstrap.
                     73:  *
1.1.1.2 ! root       74:  * The pages returned are guaranteed to be part of the direct physical
        !            75:  * mapping when paging is enabled.
        !            76:  *
        !            77:  * This function should only be used to allocate initial page table pages.
        !            78:  * Those pages are later loaded into the VM system (as reserved pages)
        !            79:  * which means they can be freed like other regular pages. Users should
        !            80:  * fix up the type of those pages once the VM system is initialized.
1.1       root       81:  */
                     82: unsigned long biosmem_bootalloc(unsigned int nr_pages);
                     83: 
                     84: /*
1.1.1.2 ! root       85:  * Return the limit of physical memory that can be directly mapped.
1.1       root       86:  */
1.1.1.2 ! root       87: phys_addr_t biosmem_directmap_end(void);
1.1       root       88: 
                     89: /*
                     90:  * Set up physical memory based on the information obtained during bootstrap
                     91:  * and load it in the VM system.
                     92:  */
                     93: void biosmem_setup(void);
                     94: 
                     95: /*
                     96:  * Free all usable memory.
                     97:  *
1.1.1.2 ! root       98:  * This function releases all pages that aren't used by boot data and have
        !            99:  * not already been loaded into the VM system.
1.1       root      100:  */
                    101: void biosmem_free_usable(void);
                    102: 
                    103: #endif /* _X86_BIOSMEM_H */

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