diff options
Diffstat (limited to 'grub-core/kern/ieee1275/init.c')
| -rw-r--r-- | grub-core/kern/ieee1275/init.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/grub-core/kern/ieee1275/init.c b/grub-core/kern/ieee1275/init.c new file mode 100644 index 0000000..682a8b5 --- /dev/null +++ b/grub-core/kern/ieee1275/init.c @@ -0,0 +1,274 @@ +/* init.c -- Initialize GRUB on the newworld mac (PPC). */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2003,2004,2005,2007,2008,2009 Free Software Foundation, Inc. + * + * GRUB 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 3 of the License, or + * (at your option) any later version. + * + * GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <grub/kernel.h> +#include <grub/dl.h> +#include <grub/disk.h> +#include <grub/mm.h> +#include <grub/partition.h> +#include <grub/normal.h> +#include <grub/fs.h> +#include <grub/setjmp.h> +#include <grub/env.h> +#include <grub/misc.h> +#include <grub/time.h> +#include <grub/ieee1275/console.h> +#include <grub/ieee1275/ofdisk.h> +#include <grub/ieee1275/ieee1275.h> +#include <grub/offsets.h> +#include <grub/memory.h> + +/* The minimal heap size we can live with. */ +#define HEAP_MIN_SIZE (unsigned long) (2 * 1024 * 1024) + +/* The maximum heap size we're going to claim */ +#define HEAP_MAX_SIZE (unsigned long) (32 * 1024 * 1024) + +/* If possible, we will avoid claiming heap above this address, because it + seems to cause relocation problems with OSes that link at 4 MiB */ +#define HEAP_MAX_ADDR (unsigned long) (32 * 1024 * 1024) + +extern char _start[]; +extern char _end[]; + +void +grub_exit (void) +{ + grub_ieee1275_exit (); +} + +/* Translate an OF filesystem path (separated by backslashes), into a GRUB + path (separated by forward slashes). */ +static void +grub_translate_ieee1275_path (char *filepath) +{ + char *backslash; + + backslash = grub_strchr (filepath, '\\'); + while (backslash != 0) + { + *backslash = '/'; + backslash = grub_strchr (filepath, '\\'); + } +} + +void +grub_machine_set_prefix (void) +{ + char bootpath[64]; /* XXX check length */ + char *filename; + char *prefix; + + if (grub_prefix[0]) + { + grub_env_set ("prefix", grub_prefix); + /* Prefix is hardcoded in the core image. */ + return; + } + + if (grub_ieee1275_get_property (grub_ieee1275_chosen, "bootpath", &bootpath, + sizeof (bootpath), 0)) + { + /* Should never happen. */ + grub_printf ("/chosen/bootpath property missing!\n"); + grub_env_set ("prefix", ""); + return; + } + + /* Transform an OF device path to a GRUB path. */ + + prefix = grub_ieee1275_encode_devname (bootpath); + + filename = grub_ieee1275_get_filename (bootpath); + if (filename) + { + char *newprefix; + char *lastslash = grub_strrchr (filename, '\\'); + + /* Truncate at last directory. */ + if (lastslash) + { + *lastslash = '\0'; + grub_translate_ieee1275_path (filename); + + newprefix = grub_xasprintf ("%s%s", prefix, filename); + if (newprefix) + { + grub_free (prefix); + prefix = newprefix; + } + } + } + + grub_env_set ("prefix", prefix); + + grub_free (filename); + grub_free (prefix); +} + +/* Claim some available memory in the first /memory node. */ +static void grub_claim_heap (void) +{ + unsigned long total = 0; + + auto int NESTED_FUNC_ATTR heap_init (grub_uint64_t addr, grub_uint64_t len, + grub_memory_type_t type); + int NESTED_FUNC_ATTR heap_init (grub_uint64_t addr, grub_uint64_t len, + grub_memory_type_t type) + { + if (type != 1) + return 0; + + if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_NO_PRE1_5M_CLAIM)) + { + if (addr + len <= 0x180000) + return 0; + + if (addr < 0x180000) + { + len = addr + len - 0x180000; + addr = 0x180000; + } + } + len -= 1; /* Required for some firmware. */ + + /* Never exceed HEAP_MAX_SIZE */ + if (total + len > HEAP_MAX_SIZE) + len = HEAP_MAX_SIZE - total; + + /* Avoid claiming anything above HEAP_MAX_ADDR, if possible. */ + if ((addr < HEAP_MAX_ADDR) && /* if it's too late, don't bother */ + (addr + len > HEAP_MAX_ADDR) && /* if it wasn't available anyway, don't bother */ + (total + (HEAP_MAX_ADDR - addr) > HEAP_MIN_SIZE)) /* only limit ourselves when we can afford to */ + len = HEAP_MAX_ADDR - addr; + + /* In theory, firmware should already prevent this from happening by not + listing our own image in /memory/available. The check below is intended + as a safeguard in case that doesn't happen. However, it doesn't protect + us from corrupting our module area, which extends up to a + yet-undetermined region above _end. */ + if ((addr < (grub_addr_t) _end) && ((addr + len) > (grub_addr_t) _start)) + { + grub_printf ("Warning: attempt to claim over our own code!\n"); + len = 0; + } + + if (len) + { + /* Claim and use it. */ + if (grub_claimmap (addr, len) < 0) + return grub_error (GRUB_ERR_OUT_OF_MEMORY, + "failed to claim heap at 0x%llx, len 0x%llx", + addr, len); + grub_mm_init_region ((void *) (grub_addr_t) addr, len); + } + + total += len; + if (total >= HEAP_MAX_SIZE) + return 1; + + return 0; + } + + if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_CANNOT_INTERPRET)) + heap_init (HEAP_MAX_ADDR - HEAP_MIN_SIZE, HEAP_MIN_SIZE, 1); + else + grub_machine_mmap_iterate (heap_init); +} + +static grub_uint64_t ieee1275_get_time_ms (void); + +void +grub_machine_init (void) +{ + char args[256]; + grub_ssize_t actual; + + grub_ieee1275_init (); + + grub_console_init_early (); + grub_claim_heap (); + grub_console_init_lately (); + grub_ofdisk_init (); + + /* Process commandline. */ + if (grub_ieee1275_get_property (grub_ieee1275_chosen, "bootargs", &args, + sizeof args, &actual) == 0 + && actual > 1) + { + int i = 0; + + while (i < actual) + { + char *command = &args[i]; + char *end; + char *val; + + end = grub_strchr (command, ';'); + if (end == 0) + i = actual; /* No more commands after this one. */ + else + { + *end = '\0'; + i += end - command + 1; + while (grub_isspace(args[i])) + i++; + } + + /* Process command. */ + val = grub_strchr (command, '='); + if (val) + { + *val = '\0'; + grub_env_set (command, val + 1); + } + } + } + + grub_install_get_time_ms (ieee1275_get_time_ms); +} + +void +grub_machine_fini (void) +{ + grub_ofdisk_fini (); + grub_console_fini (); +} + +static grub_uint64_t +ieee1275_get_time_ms (void) +{ + grub_uint32_t msecs = 0; + + grub_ieee1275_milliseconds (&msecs); + + return msecs; +} + +grub_uint32_t +grub_get_rtc (void) +{ + return ieee1275_get_time_ms (); +} + +grub_addr_t +grub_arch_modules_addr (void) +{ + return ALIGN_UP((grub_addr_t) _end + GRUB_KERNEL_MACHINE_MOD_GAP, GRUB_KERNEL_MACHINE_MOD_ALIGN); +} |