Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / interface / linux / linux_smbios.c

diff --git a/qemu/roms/ipxe/src/interface/linux/linux_smbios.c b/qemu/roms/ipxe/src/interface/linux/linux_smbios.c
new file mode 100644 (file)
index 0000000..6e5174d
--- /dev/null
+++ b/qemu/roms/ipxe/src/interface/linux/linux_smbios.c
@@ -0,0 +1,115 @@
+/*
+ * 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
+ * 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.
+ */
+
+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
+ *
+ * @v smbios           SMBIOS entry point descriptor structure to fill in
+ * @ret rc             Return status code
+ */
+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 );