193 lines
5 KiB
C
193 lines
5 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2003,2004,2005,2006,2007,2008 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/machine/memory.h>
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#include <grub/machine/int.h>
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#include <grub/err.h>
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#include <grub/types.h>
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#include <grub/misc.h>
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struct grub_machine_mmap_entry
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{
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grub_uint32_t size;
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grub_uint64_t addr;
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grub_uint64_t len;
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#define GRUB_MACHINE_MEMORY_AVAILABLE 1
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#define GRUB_MACHINE_MEMORY_RESERVED 2
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#define GRUB_MACHINE_MEMORY_ACPI 3
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#define GRUB_MACHINE_MEMORY_NVS 4
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#define GRUB_MACHINE_MEMORY_BADRAM 5
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grub_uint32_t type;
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} GRUB_PACKED;
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/*
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*
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* grub_get_conv_memsize(i) : return the conventional memory size in KB.
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* BIOS call "INT 12H" to get conventional memory size
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* The return value in AX.
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*/
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static inline grub_uint16_t
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grub_get_conv_memsize (void)
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{
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struct grub_bios_int_registers regs;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x12, ®s);
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return regs.eax & 0xffff;
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}
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/*
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* grub_get_ext_memsize() : return the extended memory size in KB.
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* BIOS call "INT 15H, AH=88H" to get extended memory size
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* The return value in AX.
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*
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*/
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static inline grub_uint16_t
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grub_get_ext_memsize (void)
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{
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struct grub_bios_int_registers regs;
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regs.eax = 0x8800;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x15, ®s);
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return regs.eax & 0xffff;
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}
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/* Get a packed EISA memory map. Lower 16 bits are between 1MB and 16MB
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in 1KB parts, and upper 16 bits are above 16MB in 64KB parts. If error, return zero.
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BIOS call "INT 15H, AH=E801H" to get EISA memory map,
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AX = memory between 1M and 16M in 1K parts.
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BX = memory above 16M in 64K parts.
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*/
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static inline grub_uint32_t
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grub_get_eisa_mmap (void)
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{
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struct grub_bios_int_registers regs;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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regs.eax = 0xe801;
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grub_bios_interrupt (0x15, ®s);
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if ((regs.eax & 0xff00) == 0x8600)
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return 0;
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return (regs.eax & 0xffff) | (regs.ebx << 16);
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}
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/*
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*
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* grub_get_mmap_entry(addr, cont) : address and old continuation value (zero to
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* start), for the Query System Address Map BIOS call.
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*
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* Sets the first 4-byte int value of "addr" to the size returned by
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* the call. If the call fails, sets it to zero.
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*
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* Returns: new (non-zero) continuation value, 0 if done.
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*/
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/* Get a memory map entry. Return next continuation value. Zero means
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the end. */
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static grub_uint32_t
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grub_get_mmap_entry (struct grub_machine_mmap_entry *entry,
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grub_uint32_t cont)
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{
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struct grub_bios_int_registers regs;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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/* place address (+4) in ES:DI */
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regs.es = ((grub_addr_t) &entry->addr) >> 4;
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regs.edi = ((grub_addr_t) &entry->addr) & 0xf;
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/* set continuation value */
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regs.ebx = cont;
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/* set default maximum buffer size */
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regs.ecx = sizeof (*entry) - sizeof (entry->size);
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/* set EDX to 'SMAP' */
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regs.edx = 0x534d4150;
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regs.eax = 0xe820;
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grub_bios_interrupt (0x15, ®s);
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/* write length of buffer (zero if error) into ADDR */
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if ((regs.flags & GRUB_CPU_INT_FLAGS_CARRY) || regs.eax != 0x534d4150
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|| regs.ecx < 0x14 || regs.ecx > 0x400)
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entry->size = 0;
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else
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entry->size = regs.ecx;
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/* return the continuation value */
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return regs.ebx;
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}
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grub_err_t
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grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
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{
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grub_uint32_t cont = 0;
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struct grub_machine_mmap_entry *entry
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= (struct grub_machine_mmap_entry *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
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int e820_works = 0;
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while (1)
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{
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grub_memset (entry, 0, sizeof (entry));
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cont = grub_get_mmap_entry (entry, cont);
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if (!entry->size)
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break;
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if (entry->len)
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e820_works = 1;
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if (entry->len
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&& hook (entry->addr, entry->len,
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/* GRUB mmaps have been defined to match with
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the E820 definition.
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Therefore, we can just pass type through. */
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entry->type, hook_data))
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break;
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if (! cont)
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break;
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}
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if (!e820_works)
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{
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grub_uint32_t eisa_mmap = grub_get_eisa_mmap ();
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if (hook (0x0, ((grub_uint32_t) grub_get_conv_memsize ()) << 10,
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GRUB_MEMORY_AVAILABLE, hook_data))
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return 0;
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if (eisa_mmap)
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{
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if (hook (0x100000, (eisa_mmap & 0xFFFF) << 10,
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GRUB_MEMORY_AVAILABLE, hook_data) == 0)
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hook (0x1000000, eisa_mmap & ~0xFFFF, GRUB_MEMORY_AVAILABLE,
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hook_data);
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}
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else
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hook (0x100000, ((grub_uint32_t) grub_get_ext_memsize ()) << 10,
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GRUB_MEMORY_AVAILABLE, hook_data);
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}
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return 0;
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}
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