diff options
Diffstat (limited to 'qemu/roms/ipxe/src/arch/i386/firmware/pcbios/memmap.c')
-rw-r--r-- | qemu/roms/ipxe/src/arch/i386/firmware/pcbios/memmap.c | 343 |
1 files changed, 0 insertions, 343 deletions
diff --git a/qemu/roms/ipxe/src/arch/i386/firmware/pcbios/memmap.c b/qemu/roms/ipxe/src/arch/i386/firmware/pcbios/memmap.c deleted file mode 100644 index bcacecd6a..000000000 --- a/qemu/roms/ipxe/src/arch/i386/firmware/pcbios/memmap.c +++ /dev/null @@ -1,343 +0,0 @@ -/* - * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>. - * - * This program 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 2 of the - * License, or any later version. - * - * This program 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 this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - * - * You can also choose to distribute this program under the terms of - * the Unmodified Binary Distribution Licence (as given in the file - * COPYING.UBDL), provided that you have satisfied its requirements. - */ - -FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); - -#include <stdint.h> -#include <errno.h> -#include <realmode.h> -#include <bios.h> -#include <memsizes.h> -#include <ipxe/io.h> - -/** - * @file - * - * Memory mapping - * - */ - -/** Magic value for INT 15,e820 calls */ -#define SMAP ( 0x534d4150 ) - -/** An INT 15,e820 memory map entry */ -struct e820_entry { - /** Start of region */ - uint64_t start; - /** Length of region */ - uint64_t len; - /** Type of region */ - uint32_t type; - /** Extended attributes (optional) */ - uint32_t attrs; -} __attribute__ (( packed )); - -#define E820_TYPE_RAM 1 /**< Normal memory */ -#define E820_TYPE_RESERVED 2 /**< Reserved and unavailable */ -#define E820_TYPE_ACPI 3 /**< ACPI reclaim memory */ -#define E820_TYPE_NVS 4 /**< ACPI NVS memory */ - -#define E820_ATTR_ENABLED 0x00000001UL -#define E820_ATTR_NONVOLATILE 0x00000002UL -#define E820_ATTR_UNKNOWN 0xfffffffcUL - -#define E820_MIN_SIZE 20 - -/** Buffer for INT 15,e820 calls */ -static struct e820_entry __bss16 ( e820buf ); -#define e820buf __use_data16 ( e820buf ) - -/** We are running during POST; inhibit INT 15,e820 and INT 15,e801 */ -uint8_t __bss16 ( memmap_post ); -#define memmap_post __use_data16 ( memmap_post ) - -/** - * Get size of extended memory via INT 15,e801 - * - * @ret extmem Extended memory size, in kB, or 0 - */ -static unsigned int extmemsize_e801 ( void ) { - uint16_t extmem_1m_to_16m_k, extmem_16m_plus_64k; - uint16_t confmem_1m_to_16m_k, confmem_16m_plus_64k; - unsigned int flags; - unsigned int extmem; - - /* Inhibit INT 15,e801 during POST */ - if ( memmap_post ) { - DBG ( "INT 15,e801 not available during POST\n" ); - return 0; - } - - __asm__ __volatile__ ( REAL_CODE ( "stc\n\t" - "int $0x15\n\t" - "pushfw\n\t" - "popw %w0\n\t" ) - : "=r" ( flags ), - "=a" ( extmem_1m_to_16m_k ), - "=b" ( extmem_16m_plus_64k ), - "=c" ( confmem_1m_to_16m_k ), - "=d" ( confmem_16m_plus_64k ) - : "a" ( 0xe801 ) ); - - if ( flags & CF ) { - DBG ( "INT 15,e801 failed with CF set\n" ); - return 0; - } - - if ( ! ( extmem_1m_to_16m_k | extmem_16m_plus_64k ) ) { - DBG ( "INT 15,e801 extmem=0, using confmem\n" ); - extmem_1m_to_16m_k = confmem_1m_to_16m_k; - extmem_16m_plus_64k = confmem_16m_plus_64k; - } - - extmem = ( extmem_1m_to_16m_k + ( extmem_16m_plus_64k * 64 ) ); - DBG ( "INT 15,e801 extended memory size %d+64*%d=%d kB " - "[100000,%llx)\n", extmem_1m_to_16m_k, extmem_16m_plus_64k, - extmem, ( 0x100000 + ( ( ( uint64_t ) extmem ) * 1024 ) ) ); - - /* Sanity check. Some BIOSes report the entire 4GB address - * space as available, which cannot be correct (since that - * would leave no address space available for 32-bit PCI - * BARs). - */ - if ( extmem == ( 0x400000 - 0x400 ) ) { - DBG ( "INT 15,e801 reported whole 4GB; assuming insane\n" ); - return 0; - } - - return extmem; -} - -/** - * Get size of extended memory via INT 15,88 - * - * @ret extmem Extended memory size, in kB - */ -static unsigned int extmemsize_88 ( void ) { - uint16_t extmem; - - /* Ignore CF; it is not reliable for this call */ - __asm__ __volatile__ ( REAL_CODE ( "int $0x15" ) - : "=a" ( extmem ) : "a" ( 0x8800 ) ); - - DBG ( "INT 15,88 extended memory size %d kB [100000, %x)\n", - extmem, ( 0x100000 + ( extmem * 1024 ) ) ); - return extmem; -} - -/** - * Get size of extended memory - * - * @ret extmem Extended memory size, in kB - * - * Note that this is only an approximation; for an accurate picture, - * use the E820 memory map obtained via get_memmap(); - */ -unsigned int extmemsize ( void ) { - unsigned int extmem_e801; - unsigned int extmem_88; - - /* Try INT 15,e801 first, then fall back to INT 15,88 */ - extmem_88 = extmemsize_88(); - extmem_e801 = extmemsize_e801(); - return ( extmem_e801 ? extmem_e801 : extmem_88 ); -} - -/** - * Get e820 memory map - * - * @v memmap Memory map to fill in - * @ret rc Return status code - */ -static int meme820 ( struct memory_map *memmap ) { - struct memory_region *region = memmap->regions; - struct memory_region *prev_region = NULL; - uint32_t next = 0; - uint32_t smap; - size_t size; - unsigned int flags; - unsigned int discard_D; - - /* Inhibit INT 15,e820 during POST */ - if ( memmap_post ) { - DBG ( "INT 15,e820 not available during POST\n" ); - return -ENOTTY; - } - - /* Clear the E820 buffer. Do this once before starting, - * rather than on each call; some BIOSes rely on the contents - * being preserved between calls. - */ - memset ( &e820buf, 0, sizeof ( e820buf ) ); - - do { - /* Some BIOSes corrupt %esi for fun. Guard against - * this by telling gcc that all non-output registers - * may be corrupted. - */ - __asm__ __volatile__ ( REAL_CODE ( "pushl %%ebp\n\t" - "stc\n\t" - "int $0x15\n\t" - "pushfw\n\t" - "popw %%dx\n\t" - "popl %%ebp\n\t" ) - : "=a" ( smap ), "=b" ( next ), - "=c" ( size ), "=d" ( flags ), - "=D" ( discard_D ) - : "a" ( 0xe820 ), "b" ( next ), - "D" ( __from_data16 ( &e820buf ) ), - "c" ( sizeof ( e820buf ) ), - "d" ( SMAP ) - : "esi", "memory" ); - - if ( smap != SMAP ) { - DBG ( "INT 15,e820 failed SMAP signature check\n" ); - return -ENOTSUP; - } - - if ( size < E820_MIN_SIZE ) { - DBG ( "INT 15,e820 returned only %zd bytes\n", size ); - return -EINVAL; - } - - if ( flags & CF ) { - DBG ( "INT 15,e820 terminated on CF set\n" ); - break; - } - - /* If first region is not RAM, assume map is invalid */ - if ( ( memmap->count == 0 ) && - ( e820buf.type != E820_TYPE_RAM ) ) { - DBG ( "INT 15,e820 failed, first entry not RAM\n" ); - return -EINVAL; - } - - DBG ( "INT 15,e820 region [%llx,%llx) type %d", - e820buf.start, ( e820buf.start + e820buf.len ), - ( int ) e820buf.type ); - if ( size > offsetof ( typeof ( e820buf ), attrs ) ) { - DBG ( " (%s", ( ( e820buf.attrs & E820_ATTR_ENABLED ) - ? "enabled" : "disabled" ) ); - if ( e820buf.attrs & E820_ATTR_NONVOLATILE ) - DBG ( ", non-volatile" ); - if ( e820buf.attrs & E820_ATTR_UNKNOWN ) - DBG ( ", other [%08x]", e820buf.attrs ); - DBG ( ")" ); - } - DBG ( "\n" ); - - /* Discard non-RAM regions */ - if ( e820buf.type != E820_TYPE_RAM ) - continue; - - /* Check extended attributes, if present */ - if ( size > offsetof ( typeof ( e820buf ), attrs ) ) { - if ( ! ( e820buf.attrs & E820_ATTR_ENABLED ) ) - continue; - if ( e820buf.attrs & E820_ATTR_NONVOLATILE ) - continue; - } - - region->start = e820buf.start; - region->end = e820buf.start + e820buf.len; - - /* Check for adjacent regions and merge them */ - if ( prev_region && ( region->start == prev_region->end ) ) { - prev_region->end = region->end; - } else { - prev_region = region; - region++; - memmap->count++; - } - - if ( memmap->count >= ( sizeof ( memmap->regions ) / - sizeof ( memmap->regions[0] ) ) ) { - DBG ( "INT 15,e820 too many regions returned\n" ); - /* Not a fatal error; what we've got so far at - * least represents valid regions of memory, - * even if we couldn't get them all. - */ - break; - } - } while ( next != 0 ); - - /* Sanity checks. Some BIOSes report complete garbage via INT - * 15,e820 (especially at POST time), despite passing the - * signature checks. We currently check for a base memory - * region (starting at 0) and at least one high memory region - * (starting at 0x100000). - */ - if ( memmap->count < 2 ) { - DBG ( "INT 15,e820 returned only %d regions; assuming " - "insane\n", memmap->count ); - return -EINVAL; - } - if ( memmap->regions[0].start != 0 ) { - DBG ( "INT 15,e820 region 0 starts at %llx (expected 0); " - "assuming insane\n", memmap->regions[0].start ); - return -EINVAL; - } - if ( memmap->regions[1].start != 0x100000 ) { - DBG ( "INT 15,e820 region 1 starts at %llx (expected 100000); " - "assuming insane\n", memmap->regions[0].start ); - return -EINVAL; - } - - return 0; -} - -/** - * Get memory map - * - * @v memmap Memory map to fill in - */ -void x86_get_memmap ( struct memory_map *memmap ) { - unsigned int basemem, extmem; - int rc; - - DBG ( "Fetching system memory map\n" ); - - /* Clear memory map */ - memset ( memmap, 0, sizeof ( *memmap ) ); - - /* Get base and extended memory sizes */ - basemem = basememsize(); - DBG ( "FBMS base memory size %d kB [0,%x)\n", - basemem, ( basemem * 1024 ) ); - extmem = extmemsize(); - - /* Try INT 15,e820 first */ - if ( ( rc = meme820 ( memmap ) ) == 0 ) { - DBG ( "Obtained system memory map via INT 15,e820\n" ); - return; - } - - /* Fall back to constructing a map from basemem and extmem sizes */ - DBG ( "INT 15,e820 failed; constructing map\n" ); - memmap->regions[0].end = ( basemem * 1024 ); - memmap->regions[1].start = 0x100000; - memmap->regions[1].end = 0x100000 + ( extmem * 1024 ); - memmap->count = 2; -} - -PROVIDE_IOAPI ( x86, get_memmap, x86_get_memmap ); |