247 lines
6.2 KiB
C
247 lines
6.2 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009,2010 Free Software Foundation, Inc.
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*
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* GRUB 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 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/kernel.h>
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#include <grub/mm.h>
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#include <grub/machine/boot.h>
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#include <grub/i386/floppy.h>
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#include <grub/machine/memory.h>
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#include <grub/machine/console.h>
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#include <grub/machine/kernel.h>
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#include <grub/machine/int.h>
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/dl.h>
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#include <grub/misc.h>
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#include <grub/loader.h>
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#include <grub/env.h>
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#include <grub/cache.h>
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#include <grub/time.h>
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#include <grub/cpu/tsc.h>
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#include <grub/machine/time.h>
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struct mem_region
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{
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grub_addr_t addr;
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grub_size_t size;
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};
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#define MAX_REGIONS 32
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static struct mem_region mem_regions[MAX_REGIONS];
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static int num_regions;
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void (*grub_pc_net_config) (char **device, char **path);
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/*
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* return the real time in ticks, of which there are about
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* 18-20 per second
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*/
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grub_uint64_t
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grub_rtc_get_time_ms (void)
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{
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struct grub_bios_int_registers regs;
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regs.eax = 0;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x1a, ®s);
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return ((regs.ecx << 16) | (regs.edx & 0xffff)) * 55ULL;
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}
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void
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grub_machine_get_bootlocation (char **device, char **path)
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{
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char *ptr;
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grub_uint8_t boot_drive, dos_part, bsd_part;
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boot_drive = (grub_boot_device >> 24);
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dos_part = (grub_boot_device >> 16);
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bsd_part = (grub_boot_device >> 8);
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/* No hardcoded root partition - make it from the boot drive and the
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partition number encoded at the install time. */
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if (boot_drive == GRUB_BOOT_MACHINE_PXE_DL)
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{
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if (grub_pc_net_config)
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grub_pc_net_config (device, path);
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return;
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}
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/* XXX: This should be enough. */
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#define DEV_SIZE 100
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*device = grub_malloc (DEV_SIZE);
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ptr = *device;
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grub_snprintf (*device, DEV_SIZE,
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"%cd%u", (boot_drive & 0x80) ? 'h' : 'f',
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boot_drive & 0x7f);
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ptr += grub_strlen (ptr);
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if (dos_part != 0xff)
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grub_snprintf (ptr, DEV_SIZE - (ptr - *device),
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",%u", dos_part + 1);
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ptr += grub_strlen (ptr);
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if (bsd_part != 0xff)
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grub_snprintf (ptr, DEV_SIZE - (ptr - *device), ",%u",
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bsd_part + 1);
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ptr += grub_strlen (ptr);
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*ptr = 0;
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}
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/* Add a memory region. */
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static void
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add_mem_region (grub_addr_t addr, grub_size_t size)
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{
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if (num_regions == MAX_REGIONS)
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/* Ignore. */
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return;
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mem_regions[num_regions].addr = addr;
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mem_regions[num_regions].size = size;
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num_regions++;
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}
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/* Compact memory regions. */
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static void
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compact_mem_regions (void)
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{
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int i, j;
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/* Sort them. */
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for (i = 0; i < num_regions - 1; i++)
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for (j = i + 1; j < num_regions; j++)
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if (mem_regions[i].addr > mem_regions[j].addr)
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{
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struct mem_region tmp = mem_regions[i];
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mem_regions[i] = mem_regions[j];
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mem_regions[j] = tmp;
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}
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/* Merge overlaps. */
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for (i = 0; i < num_regions - 1; i++)
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if (mem_regions[i].addr + mem_regions[i].size >= mem_regions[i + 1].addr)
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{
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j = i + 1;
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if (mem_regions[i].addr + mem_regions[i].size
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< mem_regions[j].addr + mem_regions[j].size)
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mem_regions[i].size = (mem_regions[j].addr + mem_regions[j].size
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- mem_regions[i].addr);
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grub_memmove (mem_regions + j, mem_regions + j + 1,
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(num_regions - j - 1) * sizeof (struct mem_region));
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i--;
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num_regions--;
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}
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}
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grub_addr_t grub_modbase;
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extern grub_uint8_t _start[], _edata[];
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/* Helper for grub_machine_init. */
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static int
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mmap_iterate_hook (grub_uint64_t addr, grub_uint64_t size,
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grub_memory_type_t type,
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void *data __attribute__ ((unused)))
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{
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/* Avoid the lower memory. */
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if (addr < GRUB_MEMORY_MACHINE_UPPER_START)
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{
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if (size <= GRUB_MEMORY_MACHINE_UPPER_START - addr)
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return 0;
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size -= GRUB_MEMORY_MACHINE_UPPER_START - addr;
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addr = GRUB_MEMORY_MACHINE_UPPER_START;
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}
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/* Ignore >4GB. */
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if (addr <= 0xFFFFFFFF && type == GRUB_MEMORY_AVAILABLE)
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{
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grub_size_t len;
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len = (grub_size_t) ((addr + size > 0xFFFFFFFF)
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? 0xFFFFFFFF - addr
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: size);
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add_mem_region (addr, len);
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}
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return 0;
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}
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void
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grub_machine_init (void)
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{
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int i;
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#if 0
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int grub_lower_mem;
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#endif
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grub_addr_t modend;
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grub_modbase = GRUB_MEMORY_MACHINE_DECOMPRESSION_ADDR + (_edata - _start);
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/* Initialize the console as early as possible. */
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grub_console_init ();
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/* This sanity check is useless since top of GRUB_MEMORY_MACHINE_RESERVED_END
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is used for stack and if it's unavailable we wouldn't have gotten so far.
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*/
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#if 0
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grub_lower_mem = grub_get_conv_memsize () << 10;
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/* Sanity check. */
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if (grub_lower_mem < GRUB_MEMORY_MACHINE_RESERVED_END)
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grub_fatal ("too small memory");
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#endif
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/* FIXME: This prevents loader/i386/linux.c from using low memory. When our
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heap implements support for requesting a chunk in low memory, this should
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no longer be a problem. */
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#if 0
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/* Add the lower memory into free memory. */
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if (grub_lower_mem >= GRUB_MEMORY_MACHINE_RESERVED_END)
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add_mem_region (GRUB_MEMORY_MACHINE_RESERVED_END,
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grub_lower_mem - GRUB_MEMORY_MACHINE_RESERVED_END);
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#endif
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grub_machine_mmap_iterate (mmap_iterate_hook, NULL);
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compact_mem_regions ();
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modend = grub_modules_get_end ();
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for (i = 0; i < num_regions; i++)
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{
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grub_addr_t beg = mem_regions[i].addr;
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grub_addr_t fin = mem_regions[i].addr + mem_regions[i].size;
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if (modend && beg < modend)
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beg = modend;
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if (beg >= fin)
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continue;
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grub_mm_init_region ((void *) beg, fin - beg);
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}
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grub_tsc_init ();
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}
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void
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grub_machine_fini (int flags)
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{
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if (flags & GRUB_LOADER_FLAG_NORETURN)
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grub_console_fini ();
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grub_stop_floppy ();
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}
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