170 lines
3.7 KiB
C
170 lines
3.7 KiB
C
#ident "$Id: msetup.c,v 1.12 2004/12/14 22:46:25 hpa Exp $"
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/* ----------------------------------------------------------------------- *
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*
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* Copyright 2001-2003 H. Peter Anvin - All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
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* Boston MA 02111-1307, USA; either version 2 of the License, or
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* (at your option) any later version; incorporated herein by reference.
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*
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* ----------------------------------------------------------------------- */
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/*
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* msetup.c
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*
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* Initialization code for memory-based disk
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*/
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#include <stdint.h>
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#include "memdisk.h"
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#include "conio.h"
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#include "e820.h"
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static inline int get_e820(void)
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{
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struct e820_info {
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uint64_t base;
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uint64_t len;
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uint32_t type;
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} *buf = sys_bounce;
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uint32_t copied;
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int range_count = 0;
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com32sys_t regs;
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memset(®s, 0, sizeof regs);
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do {
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regs.eax.l = 0x0000e820;
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regs.ecx.l = sizeof(*buf);
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regs.edx.l = 0x534d4150;
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regs.edi.w[0] = OFFS(buf);
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regs.es = SEG(buf);
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syscall(0x15, ®s, ®s);
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copied = (regs.eflags.l & 1) ? 0 : regs.ecx.l;
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if ( regs.eax.l != 0x534d4150 || copied < 20 )
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break;
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printf("e820: %08x%08x %08x%08x %d\n",
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(uint32_t)(buf->base >> 32), (uint32_t)buf->base,
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(uint32_t)(buf->len >> 32), (uint32_t)buf->len,
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buf->type);
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insertrange(buf->base, buf->len, buf->type);
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range_count++;
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} while ( regs.ebx.l );
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return !range_count;
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}
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static inline void get_dos_mem(void)
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{
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com32sys_t regs;
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memset(®s, 0, sizeof regs);
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syscall(0x12, ®s, ®s);
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insertrange(0, (uint64_t)((uint32_t)regs.eax.w[0] << 10), 1);
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printf(" DOS: %d K\n", regs.eax.w[0]);
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}
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static inline int get_e801(void)
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{
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int err;
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com32sys_t regs;
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memset(®s, 0, sizeof regs);
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regs.eax.w[0] = 0xe801;
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syscall(0x15, ®s, ®s);
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if ( !(err = regs.eflags.l & 1) ) {
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if ( regs.eax.w[0] ) {
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insertrange(0x100000, (uint64_t)((uint32_t)regs.eax.w[0] << 10), 1);
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}
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if ( regs.ebx.w[0] ) {
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insertrange(0x1000000, (uint64_t)((uint32_t)regs.ebx.w[0] << 16), 1);
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}
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printf("e801: %04x %04x\n", regs.eax.w[0], regs.ebx.w[0]);
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}
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return err;
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}
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static inline int get_88(void)
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{
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com32sys_t regs;
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int err;
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memset(®s, 0, sizeof regs);
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regs.eax.b[1] = 0x88;
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syscall(0x15, ®s, ®s);
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if ( !(err = regs.eflags.l & 1) ) {
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if ( regs.eax.w[0] ) {
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insertrange(0x100000, (uint64_t)((uint32_t)regs.eax.w[0] << 10), 1);
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}
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printf(" 88: %04x\n", regs.eax.w[0]);
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}
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return err;
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}
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uint32_t dos_mem = 0; /* 0-1MB */
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uint32_t low_mem = 0; /* 1-16MB */
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uint32_t high_mem = 0; /* 16+ MB */
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void get_mem(void)
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{
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if ( get_e820() ) {
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get_dos_mem();
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if ( get_e801() ) {
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if ( get_88() ) {
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puts("MEMDISK: Unable to obtain memory map\n");
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die();
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}
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}
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}
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}
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#define PW(x) (1ULL << (x))
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void parse_mem(void)
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{
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struct e820range *ep;
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dos_mem = low_mem = high_mem = 0;
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/* Derive "dos mem", "high mem", and "low mem" from the range array */
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for ( ep = ranges ; ep->type != -1 ; ep++ ) {
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if ( ep->type == 1 ) {
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/* Only look at memory ranges */
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if ( ep->start == 0 ) {
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if ( ep[1].start > PW(20) )
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dos_mem = PW(20);
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else
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dos_mem = ep[1].start;
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}
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if ( ep->start <= PW(20) && ep[1].start > PW(20) ) {
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if ( ep[1].start > PW(24) )
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low_mem = PW(24) - PW(20);
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else
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low_mem = ep[1].start - PW(20);
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}
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if ( ep->start <= PW(24) && ep[1].start > PW(24) ) {
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if ( ep[1].start > PW(32) )
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high_mem = PW(32) - PW(24);
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else
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high_mem = ep[1].start - PW(24);
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}
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}
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}
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}
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