288 lines
7 KiB
C
288 lines
7 KiB
C
/* init.c -- Initialize GRUB on the newworld mac (PPC). */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003,2004,2005,2007,2008,2009 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/dl.h>
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#include <grub/disk.h>
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#include <grub/mm.h>
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#include <grub/partition.h>
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#include <grub/normal.h>
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#include <grub/fs.h>
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#include <grub/setjmp.h>
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#include <grub/env.h>
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#include <grub/misc.h>
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#include <grub/time.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/cpu/kernel.h>
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#include <grub/ieee1275/ofdisk.h>
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#include <grub/ieee1275/ieee1275.h>
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/* The minimal heap size we can live with. */
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#define HEAP_MIN_SIZE (unsigned long) (2 * 1024 * 1024)
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/* The maximum heap size we're going to claim */
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#define HEAP_MAX_SIZE (unsigned long) (32 * 1024 * 1024)
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/* If possible, we will avoid claiming heap above this address, because it
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seems to cause relocation problems with OSes that link at 4 MiB */
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#define HEAP_MAX_ADDR (unsigned long) (32 * 1024 * 1024)
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extern char _start[];
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extern char _end[];
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void
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grub_exit (void)
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{
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grub_ieee1275_exit ();
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}
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/* Translate an OF filesystem path (separated by backslashes), into a GRUB
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path (separated by forward slashes). */
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static void
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grub_translate_ieee1275_path (char *filepath)
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{
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char *backslash;
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backslash = grub_strchr (filepath, '\\');
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while (backslash != 0)
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{
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*backslash = '/';
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backslash = grub_strchr (filepath, '\\');
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}
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}
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void
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grub_machine_set_prefix (void)
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{
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char bootpath[64]; /* XXX check length */
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char *filename;
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char *prefix;
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if (grub_prefix[0])
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{
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grub_env_set ("prefix", grub_prefix);
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/* Prefix is hardcoded in the core image. */
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return;
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}
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if (grub_ieee1275_get_property (grub_ieee1275_chosen, "bootpath", &bootpath,
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sizeof (bootpath), 0))
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{
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/* Should never happen. */
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grub_printf ("/chosen/bootpath property missing!\n");
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grub_env_set ("prefix", "");
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return;
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}
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/* Transform an OF device path to a GRUB path. */
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prefix = grub_ieee1275_encode_devname (bootpath);
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filename = grub_ieee1275_get_filename (bootpath);
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if (filename)
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{
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char *newprefix;
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char *lastslash = grub_strrchr (filename, '\\');
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/* Truncate at last directory. */
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if (lastslash)
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{
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*lastslash = '\0';
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grub_translate_ieee1275_path (filename);
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newprefix = grub_xasprintf ("%s%s", prefix, filename);
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if (newprefix)
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{
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grub_free (prefix);
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prefix = newprefix;
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}
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}
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}
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grub_env_set ("prefix", prefix);
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grub_free (filename);
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grub_free (prefix);
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}
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/* Claim some available memory in the first /memory node. */
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static void grub_claim_heap (void)
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{
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unsigned long total = 0;
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auto int NESTED_FUNC_ATTR heap_init (grub_uint64_t addr, grub_uint64_t len, grub_uint32_t type);
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int NESTED_FUNC_ATTR heap_init (grub_uint64_t addr, grub_uint64_t len, grub_uint32_t type)
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{
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if (type != 1)
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return 0;
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len -= 1; /* Required for some firmware. */
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/* Never exceed HEAP_MAX_SIZE */
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if (total + len > HEAP_MAX_SIZE)
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len = HEAP_MAX_SIZE - total;
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/* Avoid claiming anything above HEAP_MAX_ADDR, if possible. */
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if ((addr < HEAP_MAX_ADDR) && /* if it's too late, don't bother */
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(addr + len > HEAP_MAX_ADDR) && /* if it wasn't available anyway, don't bother */
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(total + (HEAP_MAX_ADDR - addr) > HEAP_MIN_SIZE)) /* only limit ourselves when we can afford to */
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len = HEAP_MAX_ADDR - addr;
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/* In theory, firmware should already prevent this from happening by not
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listing our own image in /memory/available. The check below is intended
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as a safeguard in case that doesn't happen. However, it doesn't protect
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us from corrupting our module area, which extends up to a
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yet-undetermined region above _end. */
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if ((addr < (grub_addr_t) _end) && ((addr + len) > (grub_addr_t) _start))
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{
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grub_printf ("Warning: attempt to claim over our own code!\n");
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len = 0;
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}
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if (len)
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{
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/* Claim and use it. */
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if (grub_claimmap (addr, len) < 0)
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return grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"failed to claim heap at 0x%llx, len 0x%llx",
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addr, len);
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grub_mm_init_region ((void *) (grub_addr_t) addr, len);
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}
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total += len;
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if (total >= HEAP_MAX_SIZE)
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return 1;
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return 0;
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}
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if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_CANNOT_INTERPRET))
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heap_init (HEAP_MAX_ADDR - HEAP_MIN_SIZE, HEAP_MIN_SIZE, 1);
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else
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grub_machine_mmap_iterate (heap_init);
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}
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#ifdef __i386__
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grub_uint32_t grub_upper_mem;
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/* We need to call this before grub_claim_memory. */
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static void
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grub_get_extended_memory (void)
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{
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auto int NESTED_FUNC_ATTR find_ext_mem (grub_uint64_t addr, grub_uint64_t len, grub_uint32_t type);
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int NESTED_FUNC_ATTR find_ext_mem (grub_uint64_t addr, grub_uint64_t len, grub_uint32_t type)
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{
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if (type == 1 && addr == 0x100000)
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{
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grub_upper_mem = len;
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return 1;
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}
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return 0;
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}
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grub_machine_mmap_iterate (find_ext_mem);
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}
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#endif
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static grub_uint64_t ieee1275_get_time_ms (void);
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void
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grub_machine_init (void)
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{
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char args[256];
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grub_ssize_t actual;
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grub_ieee1275_init ();
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grub_console_init ();
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#ifdef __i386__
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grub_get_extended_memory ();
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#endif
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grub_claim_heap ();
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grub_ofdisk_init ();
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/* Process commandline. */
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if (grub_ieee1275_get_property (grub_ieee1275_chosen, "bootargs", &args,
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sizeof args, &actual) == 0
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&& actual > 1)
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{
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int i = 0;
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while (i < actual)
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{
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char *command = &args[i];
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char *end;
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char *val;
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end = grub_strchr (command, ';');
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if (end == 0)
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i = actual; /* No more commands after this one. */
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else
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{
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*end = '\0';
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i += end - command + 1;
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while (grub_isspace(args[i]))
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i++;
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}
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/* Process command. */
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val = grub_strchr (command, '=');
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if (val)
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{
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*val = '\0';
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grub_env_set (command, val + 1);
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}
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}
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}
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grub_install_get_time_ms (ieee1275_get_time_ms);
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}
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void
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grub_machine_fini (void)
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{
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grub_ofdisk_fini ();
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grub_console_fini ();
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}
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static grub_uint64_t
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ieee1275_get_time_ms (void)
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{
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grub_uint32_t msecs = 0;
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grub_ieee1275_milliseconds (&msecs);
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return msecs;
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}
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grub_uint32_t
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grub_get_rtc (void)
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{
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return ieee1275_get_time_ms ();
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}
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grub_addr_t
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grub_arch_modules_addr (void)
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{
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return ALIGN_UP((grub_addr_t) _end + GRUB_MOD_GAP, GRUB_MOD_ALIGN);
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}
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