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Annotation of Gnu-Mach/i386/i386at/biosmem.h, revision 1.1

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: /*
        !            43:  * Early initialization of the biosmem module.
        !            44:  *
        !            45:  * This function processes the given multiboot data for BIOS-provided
        !            46:  * memory information, and sets up a bootstrap physical page allocator.
        !            47:  *
        !            48:  * It is called before paging is enabled.
        !            49:  */
        !            50: #ifdef MACH_HYP
        !            51: void biosmem_xen_bootstrap(void);
        !            52: #else /* MACH_HYP */
        !            53: void biosmem_bootstrap(struct multiboot_raw_info *mbi);
        !            54: #endif /* MACH_HYP */
        !            55: 
        !            56: /*
        !            57:  * Allocate contiguous physical pages during bootstrap.
        !            58:  *
        !            59:  * This function is called before paging is enabled. It should only be used
        !            60:  * to allocate initial page table pages. Those pages are later loaded into
        !            61:  * the VM system (as reserved pages) which means they can be freed like other
        !            62:  * regular pages. Users should fix up the type of those pages once the VM
        !            63:  * system is initialized.
        !            64:  */
        !            65: unsigned long biosmem_bootalloc(unsigned int nr_pages);
        !            66: 
        !            67: /*
        !            68:  * Return the amount of physical memory that can be directly mapped.
        !            69:  *
        !            70:  * This includes the size of both the DMA/DMA32 and DIRECTMAP segments.
        !            71:  */
        !            72: phys_addr_t biosmem_directmap_size(void);
        !            73: 
        !            74: /*
        !            75:  * Set up physical memory based on the information obtained during bootstrap
        !            76:  * and load it in the VM system.
        !            77:  */
        !            78: void biosmem_setup(void);
        !            79: 
        !            80: /*
        !            81:  * Free all usable memory.
        !            82:  *
        !            83:  * This includes ranges that weren't part of the bootstrap allocator initial
        !            84:  * heap, e.g. because they contained boot data.
        !            85:  */
        !            86: void biosmem_free_usable(void);
        !            87: 
        !            88: #endif /* _X86_BIOSMEM_H */

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