diff options
Diffstat (limited to 'drivers/firmware/iscsi_ibft_find.c')
| -rw-r--r-- | drivers/firmware/iscsi_ibft_find.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/drivers/firmware/iscsi_ibft_find.c b/drivers/firmware/iscsi_ibft_find.c new file mode 100644 index 00000000000..d0e5fa4ea51 --- /dev/null +++ b/drivers/firmware/iscsi_ibft_find.c @@ -0,0 +1,84 @@ +/* + * Copyright 2007 Red Hat, Inc. + * by Peter Jones <pjones@redhat.com> + * Copyright 2007 IBM, Inc. + * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com> + * Copyright 2008 + * by Konrad Rzeszutek <ketuzsezr@darnok.org> + * + * This code finds the iSCSI Boot Format Table. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License v2.0 as published by + * the Free Software Foundation + * + * 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. + */ + +#include <linux/bootmem.h> +#include <linux/blkdev.h> +#include <linux/ctype.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/limits.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/stat.h> +#include <linux/string.h> +#include <linux/types.h> + +#include <asm/mmzone.h> + +/* + * Physical location of iSCSI Boot Format Table. + */ +struct ibft_table_header *ibft_addr; +EXPORT_SYMBOL_GPL(ibft_addr); + +#define IBFT_SIGN "iBFT" +#define IBFT_SIGN_LEN 4 +#define IBFT_START 0x80000 /* 512kB */ +#define IBFT_END 0x100000 /* 1MB */ +#define VGA_MEM 0xA0000 /* VGA buffer */ +#define VGA_SIZE 0x20000 /* 128kB */ + + +/* + * Routine used to find the iSCSI Boot Format Table. The logical + * kernel address is set in the ibft_addr global variable. + */ +void __init reserve_ibft_region(void) +{ + unsigned long pos; + unsigned int len = 0; + void *virt; + + ibft_addr = 0; + + for (pos = IBFT_START; pos < IBFT_END; pos += 16) { + /* The table can't be inside the VGA BIOS reserved space, + * so skip that area */ + if (pos == VGA_MEM) + pos += VGA_SIZE; + virt = phys_to_virt(pos); + if (memcmp(virt, IBFT_SIGN, IBFT_SIGN_LEN) == 0) { + unsigned long *addr = + (unsigned long *)phys_to_virt(pos + 4); + len = *addr; + /* if the length of the table extends past 1M, + * the table cannot be valid. */ + if (pos + len <= (IBFT_END-1)) { + ibft_addr = (struct ibft_table_header *)virt; + break; + } + } + } + if (ibft_addr) + reserve_bootmem(pos, PAGE_ALIGN(len), BOOTMEM_DEFAULT); +} +EXPORT_SYMBOL_GPL(reserve_ibft_region); |