62ddcc8f79
Use -mrtd and -mregparm=3 to reduce the generated code sizes. This means that any missing prototypes could be fatal. Also, you must take care when writing assembly code. See the comments at the beginning of startup.S, for more details. * kern/i386/pc/startup.S (pupa_halt): Modified for the new compilation mechanism. (pupa_chainloader_real_boot): Likewise. (pupa_biosdisk_rw_int13_extensions): Likewise. (pupa_biosdisk_rw_standard): Likewise. (pupa_biosdisk_check_int13_extensions): Likewise. (pupa_biosdisk_get_diskinfo_int13_extensions): Likewise. (pupa_biosdisk_get_diskinfo_standard): Likewise. (pupa_get_memsize): Likewise. (pupa_get_mmap_entry): Likewise. (pupa_console_putchar): Likewise. (pupa_console_setcursor): Likewise. (pupa_getrtsecs): Use pushl instead of push. * kern/i386/pc/init.c (pupa_machine_init): Use the scratch memory instead of the stack for a mmap entry, because some BIOSes may ignore the maximum size and overflow. * conf/i386-pc.rmk (COMMON_CFLAGS): Added -mrtd and -mregparm=3. * genmk.rb (PModule#rule): Compile automatically generated sources with module-specific CFLAGS as well as other sources.
115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/*
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* PUPA -- Preliminary Universal Programming Architecture for GRUB
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* Copyright (C) 2002 Yoshinori K. Okuji <okuji@enbug.org>
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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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <pupa/kernel.h>
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#include <pupa/mm.h>
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#include <pupa/machine/init.h>
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#include <pupa/machine/memory.h>
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#include <pupa/machine/console.h>
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#include <pupa/machine/biosdisk.h>
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#include <pupa/types.h>
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#include <pupa/err.h>
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void
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pupa_machine_init (void)
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{
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pupa_uint32_t cont;
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struct pupa_machine_mmap_entry *entry
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= (struct pupa_machine_mmap_entry *) PUPA_MEMORY_MACHINE_SCRATCH_ADDR;
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pupa_size_t lower_mem = (pupa_get_memsize (0) << 10);
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pupa_addr_t end_addr = pupa_get_end_addr ();
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/* Initialize the console as early as possible. */
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pupa_console_init ();
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/* Sanity check. */
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if (lower_mem < PUPA_MEMORY_MACHINE_RESERVED_END)
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pupa_fatal ("too small memory");
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/* Turn on Gate A20 to access >1MB. */
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pupa_gate_a20 (1);
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/* Add the lower memory into free memory. */
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if (lower_mem >= PUPA_MEMORY_MACHINE_RESERVED_END)
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pupa_mm_init_region ((void *) PUPA_MEMORY_MACHINE_RESERVED_END,
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lower_mem - PUPA_MEMORY_MACHINE_RESERVED_END);
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pupa_mm_init_region ((void *) end_addr,
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PUPA_MEMORY_MACHINE_RESERVED_START - end_addr);
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/* Check if pupa_get_mmap_entry works. */
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cont = pupa_get_mmap_entry (entry, 0);
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if (entry->size)
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do
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{
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/* Avoid the lower memory. */
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if (entry->addr < 0x100000)
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{
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if (entry->len <= 0x100000 - entry->addr)
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goto next;
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entry->len -= 0x100000 - entry->addr;
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entry->addr = 0x100000;
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}
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/* Ignore >4GB. */
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if (entry->addr <= 0xFFFFFFFF && entry->type == 1)
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{
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pupa_addr_t addr;
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pupa_size_t len;
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addr = (pupa_addr_t) entry->addr;
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len = ((addr + entry->len > 0xFFFFFFFF)
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? 0xFFFFFFFF - addr
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: (pupa_size_t) entry->len);
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pupa_mm_init_region ((void *) addr, len);
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}
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next:
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if (! cont)
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break;
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cont = pupa_get_mmap_entry (entry, cont);
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}
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while (entry->size);
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else
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{
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pupa_uint32_t eisa_mmap = pupa_get_eisa_mmap ();
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if (eisa_mmap)
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{
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if ((eisa_mmap & 0xFFFF) == 0x3C00)
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pupa_mm_init_region ((void *) 0x100000,
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(eisa_mmap << 16) + 0x100000 * 15);
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else
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{
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pupa_mm_init_region ((void *) 0x100000,
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(eisa_mmap & 0xFFFF) << 10);
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pupa_mm_init_region ((void *) 0x1000000, eisa_mmap << 16);
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}
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}
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else
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pupa_mm_init_region ((void *) 0x100000,
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(pupa_size_t) pupa_get_memsize (1) << 10);
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}
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/* The memory system was initialized, thus register built-in devices. */
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pupa_biosdisk_init ();
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}
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