diff options
Diffstat (limited to 'i386/pc/i16/i16_ext_mem.c')
| -rw-r--r-- | i386/pc/i16/i16_ext_mem.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/i386/pc/i16/i16_ext_mem.c b/i386/pc/i16/i16_ext_mem.c deleted file mode 100644 index 08cbecf..0000000 --- a/i386/pc/i16/i16_ext_mem.c +++ /dev/null @@ -1,151 +0,0 @@ -/* - * Copyright (c) 1995-1994 The University of Utah and - * the Computer Systems Laboratory at the University of Utah (CSL). - * All rights reserved. - * - * Permission to use, copy, modify and distribute this software is hereby - * granted provided that (1) source code retains these copyright, permission, - * and disclaimer notices, and (2) redistributions including binaries - * reproduce the notices in supporting documentation, and (3) all advertising - * materials mentioning features or use of this software display the following - * acknowledgement: ``This product includes software developed by the - * Computer Systems Laboratory at the University of Utah.'' - * - * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS - * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF - * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. - * - * CSL requests users of this software to return to csl-dist@cs.utah.edu any - * improvements that they make and grant CSL redistribution rights. - * - * Author: Bryan Ford, University of Utah CSL - */ - -#include <mach/machine/code16.h> -#include <mach/machine/vm_types.h> -#include <mach/machine/far_ptr.h> -#include <mach/machine/proc_reg.h> - -#include "i16_bios.h" -#include "phys_mem.h" -#include "vm_param.h" -#include "debug.h" - - -static vm_offset_t ext_mem_phys_free_mem; -static vm_size_t ext_mem_phys_free_size; - - -CODE32 - -int ext_mem_collect(void) -{ - if (ext_mem_phys_free_mem) - { - phys_mem_add(ext_mem_phys_free_mem, ext_mem_phys_free_size); - ext_mem_phys_free_mem = 0; - } -} - -CODE16 - -void i16_ext_mem_check() -{ - vm_offset_t ext_mem_top, ext_mem_bot; - unsigned short ext_mem_k; - - /* Find the top of available extended memory. */ - asm volatile(" - int $0x15 - jnc 1f - xorw %%ax,%%ax - 1: - " : "=a" (ext_mem_k) - : "a" (0x8800)); - ext_mem_top = 0x100000 + (vm_offset_t)ext_mem_k * 1024; - - /* XXX check for >16MB memory using function 0xc7 */ - - ext_mem_bot = 0x100000; - - /* Check for extended memory allocated bottom-up: method 1. - This uses the technique (and, loosely, the code) - described in the VCPI spec, version 1.0. */ - if (ext_mem_top > ext_mem_bot) - { - asm volatile(" - pushw %%es - - xorw %%ax,%%ax - movw %%ax,%%es - movw %%es:0x19*4+2,%%ax - movw %%ax,%%es - - movw $0x12,%%di - movw $7,%%cx - rep - cmpsb - jne 1f - - xorl %%edx,%%edx - movb %%es:0x2e,%%dl - shll $16,%%edx - movw %%es:0x2c,%%dx - - 1: - popw %%es - " : "=d" (ext_mem_bot) - : "d" (ext_mem_bot), - "S" ((unsigned short)(vm_offset_t)"VDISK V") - : "eax", "ecx", "esi", "edi"); - } - i16_assert(ext_mem_bot >= 0x100000); - - /* Check for extended memory allocated bottom-up: method 2. - This uses the technique (and, loosely, the code) - described in the VCPI spec, version 1.0. */ - if (ext_mem_top > ext_mem_bot) - { - struct { - char pad1[3]; - char V; - long DISK; - char pad2[30-8]; - unsigned short addr; - } buf; - unsigned char rc; - - i16_assert(sizeof(buf) == 0x20); - rc = i16_bios_copy_ext_mem(0x100000, kvtolin((vm_offset_t)&buf), sizeof(buf)/2); - if ((rc == 0) && (buf.V == 'V') && (buf.DISK == 'DISK')) - { - vm_offset_t new_bot = (vm_offset_t)buf.addr << 10; - i16_assert(new_bot > 0x100000); - if (new_bot > ext_mem_bot) - ext_mem_bot = new_bot; - } - } - i16_assert(ext_mem_bot >= 0x100000); - - if (ext_mem_top > ext_mem_bot) - { - ext_mem_phys_free_mem = ext_mem_bot; - ext_mem_phys_free_size = ext_mem_top - ext_mem_bot; - - /* We need to update phys_mem_max here - instead of just letting phys_mem_add() do it - when the memory is collected with phys_mem_collect(), - because VCPI initialization needs to know the top of physical memory - before phys_mem_collect() is called. - See i16_vcpi.c for the gross details. */ - if (ext_mem_top > phys_mem_max) - phys_mem_max = ext_mem_top; - } -} - -void i16_ext_mem_shutdown() -{ - /* We didn't actually allocate the memory, - so no need to deallocate it... */ -} - |