diff options
Diffstat (limited to 'grub-core/kern/i386/pc/init.c')
| -rw-r--r-- | grub-core/kern/i386/pc/init.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/grub-core/kern/i386/pc/init.c b/grub-core/kern/i386/pc/init.c new file mode 100644 index 0000000..27bc68b --- /dev/null +++ b/grub-core/kern/i386/pc/init.c @@ -0,0 +1,271 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009,2010 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/mm.h> +#include <grub/machine/boot.h> +#include <grub/i386/floppy.h> +#include <grub/machine/memory.h> +#include <grub/machine/console.h> +#include <grub/machine/kernel.h> +#include <grub/machine/int.h> +#include <grub/types.h> +#include <grub/err.h> +#include <grub/dl.h> +#include <grub/misc.h> +#include <grub/loader.h> +#include <grub/env.h> +#include <grub/cache.h> +#include <grub/time.h> +#include <grub/cpu/cpuid.h> +#include <grub/cpu/tsc.h> +#include <grub/machine/time.h> + +struct mem_region +{ + grub_addr_t addr; + grub_size_t size; +}; + +#define MAX_REGIONS 32 + +static struct mem_region mem_regions[MAX_REGIONS]; +static int num_regions; + +void (*grub_pc_net_config) (char **device, char **path); + +/* + * return the real time in ticks, of which there are about + * 18-20 per second + */ +grub_uint64_t +grub_rtc_get_time_ms (void) +{ + struct grub_bios_int_registers regs; + + regs.eax = 0; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x1a, ®s); + + return ((regs.ecx << 16) | (regs.edx & 0xffff)) * 55ULL; +} + +void +grub_machine_get_bootlocation (char **device, char **path) +{ + char *ptr; + grub_uint8_t boot_drive, dos_part, bsd_part; + + boot_drive = (grub_boot_device >> 24); + dos_part = (grub_boot_device >> 16); + bsd_part = (grub_boot_device >> 8); + + /* No hardcoded root partition - make it from the boot drive and the + partition number encoded at the install time. */ + if (boot_drive == GRUB_BOOT_MACHINE_PXE_DL) + { + if (grub_pc_net_config) + grub_pc_net_config (device, path); + return; + } + + /* XXX: This should be enough. */ +#define DEV_SIZE 100 + *device = grub_malloc (DEV_SIZE); + ptr = *device; + grub_snprintf (*device, DEV_SIZE, + "%cd%u", (boot_drive & 0x80) ? 'h' : 'f', + boot_drive & 0x7f); + ptr += grub_strlen (ptr); + + if (dos_part != 0xff) + grub_snprintf (ptr, DEV_SIZE - (ptr - *device), + ",%u", dos_part + 1); + ptr += grub_strlen (ptr); + + if (bsd_part != 0xff) + grub_snprintf (ptr, DEV_SIZE - (ptr - *device), ",%u", + bsd_part + 1); + ptr += grub_strlen (ptr); + *ptr = 0; +} + +/* Add a memory region. */ +static void +add_mem_region (grub_addr_t addr, grub_size_t size) +{ + if (num_regions == MAX_REGIONS) + /* Ignore. */ + return; + + mem_regions[num_regions].addr = addr; + mem_regions[num_regions].size = size; + num_regions++; +} + +/* Compact memory regions. */ +static void +compact_mem_regions (void) +{ + int i, j; + + /* Sort them. */ + for (i = 0; i < num_regions - 1; i++) + for (j = i + 1; j < num_regions; j++) + if (mem_regions[i].addr > mem_regions[j].addr) + { + struct mem_region tmp = mem_regions[i]; + mem_regions[i] = mem_regions[j]; + mem_regions[j] = tmp; + } + + /* Merge overlaps. */ + for (i = 0; i < num_regions - 1; i++) + if (mem_regions[i].addr + mem_regions[i].size >= mem_regions[i + 1].addr) + { + j = i + 1; + + if (mem_regions[i].addr + mem_regions[i].size + < mem_regions[j].addr + mem_regions[j].size) + mem_regions[i].size = (mem_regions[j].addr + mem_regions[j].size + - mem_regions[i].addr); + + grub_memmove (mem_regions + j, mem_regions + j + 1, + (num_regions - j - 1) * sizeof (struct mem_region)); + i--; + num_regions--; + } +} + +grub_addr_t grub_modbase; +extern grub_uint8_t _start[], _edata[]; + +/* Helper for grub_machine_init. */ +static int +mmap_iterate_hook (grub_uint64_t addr, grub_uint64_t size, + grub_memory_type_t type, + void *data __attribute__ ((unused))) +{ + /* Avoid the lower memory. */ + if (addr < GRUB_MEMORY_MACHINE_UPPER_START) + { + if (size <= GRUB_MEMORY_MACHINE_UPPER_START - addr) + return 0; + + size -= GRUB_MEMORY_MACHINE_UPPER_START - addr; + addr = GRUB_MEMORY_MACHINE_UPPER_START; + } + + /* Ignore >4GB. */ + if (addr <= 0xFFFFFFFF && type == GRUB_MEMORY_AVAILABLE) + { + grub_size_t len; + + len = (grub_size_t) ((addr + size > 0xFFFFFFFF) + ? 0xFFFFFFFF - addr + : size); + add_mem_region (addr, len); + } + + return 0; +} + +extern grub_uint16_t grub_bios_via_workaround1, grub_bios_via_workaround2; + +/* Via needs additional wbinvd. */ +static void +grub_via_workaround_init (void) +{ + grub_uint32_t manufacturer[3], max_cpuid; + if (! grub_cpu_is_cpuid_supported ()) + return; + + grub_cpuid (0, max_cpuid, manufacturer[0], manufacturer[2], manufacturer[1]); + + if (grub_memcmp (manufacturer, "CentaurHauls", 12) != 0) + return; + + grub_bios_via_workaround1 = 0x090f; + grub_bios_via_workaround2 = 0x090f; + asm volatile ("wbinvd"); +} + +void +grub_machine_init (void) +{ + int i; +#if 0 + int grub_lower_mem; +#endif + grub_addr_t modend; + + /* This has to happen before any BIOS calls. */ + grub_via_workaround_init (); + + grub_modbase = GRUB_MEMORY_MACHINE_DECOMPRESSION_ADDR + (_edata - _start); + + /* Initialize the console as early as possible. */ + grub_console_init (); + + /* This sanity check is useless since top of GRUB_MEMORY_MACHINE_RESERVED_END + is used for stack and if it's unavailable we wouldn't have gotten so far. + */ +#if 0 + grub_lower_mem = grub_get_conv_memsize () << 10; + + /* Sanity check. */ + if (grub_lower_mem < GRUB_MEMORY_MACHINE_RESERVED_END) + grub_fatal ("too small memory"); +#endif + +/* FIXME: This prevents loader/i386/linux.c from using low memory. When our + heap implements support for requesting a chunk in low memory, this should + no longer be a problem. */ +#if 0 + /* Add the lower memory into free memory. */ + if (grub_lower_mem >= GRUB_MEMORY_MACHINE_RESERVED_END) + add_mem_region (GRUB_MEMORY_MACHINE_RESERVED_END, + grub_lower_mem - GRUB_MEMORY_MACHINE_RESERVED_END); +#endif + + grub_machine_mmap_iterate (mmap_iterate_hook, NULL); + + compact_mem_regions (); + + modend = grub_modules_get_end (); + for (i = 0; i < num_regions; i++) + { + grub_addr_t beg = mem_regions[i].addr; + grub_addr_t fin = mem_regions[i].addr + mem_regions[i].size; + if (modend && beg < modend) + beg = modend; + if (beg >= fin) + continue; + grub_mm_init_region ((void *) beg, fin - beg); + } + + grub_tsc_init (); +} + +void +grub_machine_fini (int flags) +{ + if (flags & GRUB_LOADER_FLAG_NORETURN) + grub_console_fini (); + grub_stop_floppy (); +} |