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okuji 2002-12-27 08:53:07 +00:00
commit 6a161fa938
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kern/i386/pc/init.c Normal file
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/*
* PUPA -- Preliminary Universal Programming Architecture for GRUB
* Copyright (C) 2002 Yoshinori K. Okuji <okuji@enbug.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <pupa/kernel.h>
#include <pupa/mm.h>
#include <pupa/machine/init.h>
#include <pupa/machine/memory.h>
#include <pupa/machine/console.h>
#include <pupa/machine/biosdisk.h>
#include <pupa/types.h>
#include <pupa/err.h>
void
pupa_machine_init (void)
{
pupa_uint32_t cont;
struct pupa_machine_mmap_entry entry;
pupa_size_t lower_mem = (pupa_get_memsize (0) << 10);
pupa_addr_t end_addr = pupa_get_end_addr ();
/* Initialize the console as early as possible. */
pupa_console_init ();
/* Sanity check. */
if (lower_mem < PUPA_MEMORY_MACHINE_RESERVED_END)
pupa_fatal ("too small memory");
/* Turn on Gate A20 to access >1MB. */
pupa_gate_a20 (1);
/* Add the lower memory into free memory. */
if (lower_mem >= PUPA_MEMORY_MACHINE_RESERVED_END)
pupa_mm_init_region ((void *) PUPA_MEMORY_MACHINE_RESERVED_END,
lower_mem - PUPA_MEMORY_MACHINE_RESERVED_END);
pupa_mm_init_region ((void *) end_addr,
PUPA_MEMORY_MACHINE_RESERVED_START - end_addr);
/* Check if pupa_get_mmap_entry works. */
cont = pupa_get_mmap_entry (&entry, 0);
if (entry.size)
do
{
/* Avoid the lower memory. */
if (entry.addr < 0x100000)
{
if (entry.len <= 0x100000 - entry.addr)
goto next;
entry.len -= 0x100000 - entry.addr;
entry.addr = 0x100000;
}
/* Ignore >4GB. */
if (entry.addr <= 0xFFFFFFFF && entry.type == 1)
{
pupa_addr_t addr;
pupa_size_t len;
addr = (pupa_addr_t) entry.addr;
len = ((addr + entry.len > 0xFFFFFFFF)
? 0xFFFFFFFF - addr
: (pupa_size_t) entry.len);
pupa_mm_init_region ((void *) addr, len);
}
next:
if (! cont)
break;
cont = pupa_get_mmap_entry (&entry, cont);
}
while (entry.size);
else
{
pupa_uint32_t eisa_mmap = pupa_get_eisa_mmap ();
if (eisa_mmap)
{
if ((eisa_mmap & 0xFFFF) == 0x3C00)
pupa_mm_init_region ((void *) 0x100000,
(eisa_mmap << 16) + 0x100000 * 15);
else
{
pupa_mm_init_region ((void *) 0x100000,
(eisa_mmap & 0xFFFF) << 10);
pupa_mm_init_region ((void *) 0x1000000, eisa_mmap << 16);
}
}
else
pupa_mm_init_region ((void *) 0x100000,
(pupa_size_t) pupa_get_memsize (1) << 10);
}
/* The memory system was initialized, thus register built-in devices. */
pupa_biosdisk_init ();
}