mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 18:50:54 +07:00
d95236782b
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 23 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.115786599@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright 2007-2010 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.
|
|
*/
|
|
|
|
#include <linux/memblock.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/device.h>
|
|
#include <linux/efi.h>
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/limits.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/iscsi_ibft.h>
|
|
|
|
#include <asm/mmzone.h>
|
|
|
|
/*
|
|
* Physical location of iSCSI Boot Format Table.
|
|
*/
|
|
struct acpi_table_ibft *ibft_addr;
|
|
EXPORT_SYMBOL_GPL(ibft_addr);
|
|
|
|
static const struct {
|
|
char *sign;
|
|
} ibft_signs[] = {
|
|
{ "iBFT" },
|
|
{ "BIFT" }, /* Broadcom iSCSI Offload */
|
|
};
|
|
|
|
#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 */
|
|
|
|
static int __init find_ibft_in_mem(void)
|
|
{
|
|
unsigned long pos;
|
|
unsigned int len = 0;
|
|
void *virt;
|
|
int i;
|
|
|
|
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 = isa_bus_to_virt(pos);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ibft_signs); i++) {
|
|
if (memcmp(virt, ibft_signs[i].sign, IBFT_SIGN_LEN) ==
|
|
0) {
|
|
unsigned long *addr =
|
|
(unsigned long *)isa_bus_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 acpi_table_ibft *)virt;
|
|
pr_info("iBFT found at 0x%lx.\n", pos);
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
done:
|
|
return len;
|
|
}
|
|
/*
|
|
* Routine used to find the iSCSI Boot Format Table. The logical
|
|
* kernel address is set in the ibft_addr global variable.
|
|
*/
|
|
unsigned long __init find_ibft_region(unsigned long *sizep)
|
|
{
|
|
ibft_addr = NULL;
|
|
|
|
/* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will
|
|
* only use ACPI for this */
|
|
|
|
if (!efi_enabled(EFI_BOOT))
|
|
find_ibft_in_mem();
|
|
|
|
if (ibft_addr) {
|
|
*sizep = PAGE_ALIGN(ibft_addr->header.length);
|
|
return (u64)virt_to_phys(ibft_addr);
|
|
}
|
|
|
|
*sizep = 0;
|
|
return 0;
|
|
}
|