* @ret rc Return status code
*/
static int bios_find_smbios ( struct smbios *smbios ) {
- union {
- struct smbios_entry entry;
- uint8_t bytes[256]; /* 256 is maximum length possible */
- } u;
- static unsigned int offset = 0;
- size_t len;
- unsigned int i;
- uint8_t sum;
+ struct smbios_entry entry;
+ int rc;
- /* Try to find SMBIOS */
- for ( ; offset < 0x10000 ; offset += 0x10 ) {
+ /* Scan through BIOS segment to find SMBIOS entry point */
+ if ( ( rc = find_smbios_entry ( real_to_user ( BIOS_SEG, 0 ), 0x10000,
+ &entry ) ) != 0 )
+ return rc;
- /* Read start of header and verify signature */
- copy_from_real ( &u.entry, BIOS_SEG, offset,
- sizeof ( u.entry ));
- if ( u.entry.signature != SMBIOS_SIGNATURE )
- continue;
+ /* Fill in entry point descriptor structure */
+ smbios->address = phys_to_user ( entry.smbios_address );
+ smbios->len = entry.smbios_len;
+ smbios->count = entry.smbios_count;
+ smbios->version = SMBIOS_VERSION ( entry.major, entry.minor );
- /* Read whole header and verify checksum */
- len = u.entry.len;
- copy_from_real ( &u.bytes, BIOS_SEG, offset, len );
- for ( i = 0 , sum = 0 ; i < len ; i++ ) {
- sum += u.bytes[i];
- }
- if ( sum != 0 ) {
- DBG ( "SMBIOS at %04x:%04x has bad checksum %02x\n",
- BIOS_SEG, offset, sum );
- continue;
- }
-
- /* Fill result structure */
- DBG ( "Found SMBIOS v%d.%d entry point at %04x:%04x\n",
- u.entry.major, u.entry.minor, BIOS_SEG, offset );
- smbios->address = phys_to_user ( u.entry.smbios_address );
- smbios->len = u.entry.smbios_len;
- smbios->count = u.entry.smbios_count;
- smbios->version =
- SMBIOS_VERSION ( u.entry.major, u.entry.minor );
- return 0;
- }
-
- DBG ( "No SMBIOS found\n" );
- return -ENODEV;
+ return 0;
}
PROVIDE_SMBIOS ( pcbios, find_smbios, bios_find_smbios );
#define SMBIOS_VERSION( major, minor ) ( ( (major) << 8 ) | (minor) )
extern int find_smbios ( struct smbios *smbios );
+extern int find_smbios_entry ( userptr_t start, size_t len,
+ struct smbios_entry *entry );
extern int find_smbios_structure ( unsigned int type, unsigned int instance,
struct smbios_structure *structure );
extern int read_smbios_structure ( struct smbios_structure *structure,
/*
- * Copyright (C) 2010 Piotr Jaroszyński <p.jaroszynski@gmail.com>
+ * Copyright (C) 2013 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
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
*/
-FILE_LICENCE(GPL2_OR_LATER);
+FILE_LICENCE ( GPL2_OR_LATER );
#include <errno.h>
+#include <linux_api.h>
+#include <ipxe/linux.h>
#include <ipxe/smbios.h>
+/** SMBIOS filename */
+static const char smbios_filename[] = "/dev/mem";
+
+/** SMBIOS entry point scan region start address */
+#define SMBIOS_ENTRY_START 0xf0000
+
+/** SMBIOS entry point scan region length */
+#define SMBIOS_ENTRY_LEN 0x10000
+
+/** SMBIOS mapping alignment */
+#define SMBIOS_ALIGN 0x1000
+
/**
* Find SMBIOS
*
- * Not implemented currently.
- *
* @v smbios SMBIOS entry point descriptor structure to fill in
* @ret rc Return status code
*/
-static int linux_find_smbios(struct smbios *smbios __unused)
-{
- return -ENODEV;
+static int linux_find_smbios ( struct smbios *smbios ) {
+ struct smbios_entry entry;
+ void *entry_mem;
+ void *smbios_mem;
+ size_t smbios_offset;
+ size_t smbios_indent;
+ size_t smbios_len;
+ int fd;
+ int rc;
+
+ /* Open SMBIOS file */
+ fd = linux_open ( smbios_filename, O_RDONLY );
+ if ( fd < 0 ) {
+ rc = -ELINUX ( linux_errno );
+ DBGC ( smbios, "SMBIOS could not open %s: %s\n",
+ smbios_filename, linux_strerror ( linux_errno ) );
+ goto err_open;
+ }
+
+ /* Map the region potentially containing the SMBIOS entry point */
+ entry_mem = linux_mmap ( NULL, SMBIOS_ENTRY_LEN, PROT_READ, MAP_SHARED,
+ fd, SMBIOS_ENTRY_START );
+ if ( entry_mem == MAP_FAILED ) {
+ rc = -ELINUX ( linux_errno );
+ DBGC ( smbios, "SMBIOS could not mmap %s (%#x+%#x): %s\n",
+ smbios_filename, SMBIOS_ENTRY_START, SMBIOS_ENTRY_LEN,
+ linux_strerror ( linux_errno ) );
+ goto err_mmap_entry;
+ }
+
+ /* Scan for the SMBIOS entry point */
+ if ( ( rc = find_smbios_entry ( virt_to_user ( entry_mem ),
+ SMBIOS_ENTRY_LEN, &entry ) ) != 0 )
+ goto err_find_entry;
+
+ /* Map the region containing the SMBIOS structures */
+ smbios_indent = ( entry.smbios_address & ( SMBIOS_ALIGN - 1 ) );
+ smbios_offset = ( entry.smbios_address - smbios_indent );
+ smbios_len = ( entry.smbios_len + smbios_indent );
+ smbios_mem = linux_mmap ( NULL, smbios_len, PROT_READ, MAP_SHARED,
+ fd, smbios_offset );
+ if ( smbios_mem == MAP_FAILED ) {
+ rc = -ELINUX ( linux_errno );
+ DBGC ( smbios, "SMBIOS could not mmap %s (%#zx+%#zx): %s\n",
+ smbios_filename, smbios_offset, smbios_len,
+ linux_strerror ( linux_errno ) );
+ goto err_mmap_smbios;
+ }
+
+ /* Fill in entry point descriptor structure */
+ smbios->address = virt_to_user ( smbios_mem + smbios_indent );
+ smbios->len = entry.smbios_len;
+ smbios->count = entry.smbios_count;
+ smbios->version = SMBIOS_VERSION ( entry.major, entry.minor );
+
+ /* Unmap the entry point region (no longer required) */
+ linux_munmap ( entry_mem, SMBIOS_ENTRY_LEN );
+
+ return 0;
+
+ linux_munmap ( smbios_mem, smbios_len );
+ err_mmap_smbios:
+ err_find_entry:
+ linux_munmap ( entry_mem, SMBIOS_ENTRY_LEN );
+ err_mmap_entry:
+ linux_close ( fd );
+ err_open:
+ return rc;
}
-PROVIDE_SMBIOS(linux, find_smbios, linux_find_smbios);
+PROVIDE_SMBIOS ( linux, find_smbios, linux_find_smbios );
.address = UNULL,
};
+/**
+ * Scan for SMBIOS entry point structure
+ *
+ * @v start Start address of region to scan
+ * @v len Length of region to scan
+ * @v entry SMBIOS entry point structure to fill in
+ * @ret rc Return status code
+ */
+int find_smbios_entry ( userptr_t start, size_t len,
+ struct smbios_entry *entry ) {
+ uint8_t buf[256]; /* 256 is maximum length possible */
+ static size_t offset = 0; /* Avoid repeated attempts to locate SMBIOS */
+ size_t entry_len;
+ unsigned int i;
+ uint8_t sum;
+
+ /* Try to find SMBIOS */
+ for ( ; offset < len ; offset += 0x10 ) {
+
+ /* Read start of header and verify signature */
+ copy_from_user ( entry, start, offset, sizeof ( *entry ) );
+ if ( entry->signature != SMBIOS_SIGNATURE )
+ continue;
+
+ /* Read whole header and verify checksum */
+ entry_len = entry->len;
+ assert ( entry_len <= sizeof ( buf ) );
+ copy_from_user ( buf, start, offset, entry_len );
+ for ( i = 0, sum = 0 ; i < entry_len ; i++ ) {
+ sum += buf[i];
+ }
+ if ( sum != 0 ) {
+ DBG ( "SMBIOS at %08lx has bad checksum %02x\n",
+ user_to_phys ( start, offset ), sum );
+ continue;
+ }
+
+ /* Fill result structure */
+ DBG ( "Found SMBIOS v%d.%d entry point at %08lx\n",
+ entry->major, entry->minor,
+ user_to_phys ( start, offset ) );
+ return 0;
+ }
+
+ DBG ( "No SMBIOS found\n" );
+ return -ENODEV;
+}
+
/**
* Find SMBIOS strings terminator
*
projects / thirdparty / ipxe.git / commitdiff
