Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752566AbZGHEO7 (ORCPT ); Wed, 8 Jul 2009 00:14:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751108AbZGHEO3 (ORCPT ); Wed, 8 Jul 2009 00:14:29 -0400 Received: from vms173005pub.verizon.net ([206.46.173.5]:31772 "EHLO vms173005pub.verizon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750743AbZGHEOF (ORCPT ); Wed, 8 Jul 2009 00:14:05 -0400 From: Len Brown To: x86@kernel.org, sfi-devel@simplefirmware.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Cc: Feng Tang , Len Brown Subject: [PATCH 05/12] SFI: add core support Date: Wed, 08 Jul 2009 00:13:51 -0400 Message-id: <10fb28adc204382cb3b1acc99eabbb369d378a0f.1247025117.git.len.brown@intel.com> X-Mailer: git-send-email 1.6.3.3.385.g60647 In-reply-to: <1247026438-20891-1-git-send-email-lenb@kernel.org> References: <1247026438-20891-1-git-send-email-lenb@kernel.org> In-reply-to: <8e4a93858bce74ed3080dd607aa471023f1a2737.1247025117.git.len.brown@intel.com> References: <8e4a93858bce74ed3080dd607aa471023f1a2737.1247025117.git.len.brown@intel.com> X-Patchwork-Hint: ignore Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 13994 Lines: 486 From: Feng Tang drivers/sfi/sfi_core.c contains the generic SFI implementation. It has a private header, sfi_core.h, for its own use and the private use of future files in drivers/sfi/ Signed-off-by: Feng Tang Signed-off-by: Len Brown --- drivers/Makefile | 1 + drivers/sfi/Makefile | 1 + drivers/sfi/sfi_core.c | 385 ++++++++++++++++++++++++++++++++++++++++++++++++ drivers/sfi/sfi_core.h | 44 ++++++ 4 files changed, 431 insertions(+), 0 deletions(-) create mode 100644 drivers/sfi/Makefile create mode 100644 drivers/sfi/sfi_core.c create mode 100644 drivers/sfi/sfi_core.h diff --git a/drivers/Makefile b/drivers/Makefile index bc4205d..ccfa259 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_PARISC) += parisc/ obj-$(CONFIG_RAPIDIO) += rapidio/ obj-y += video/ obj-$(CONFIG_ACPI) += acpi/ +obj-$(CONFIG_SFI) += sfi/ # PnP must come after ACPI since it will eventually need to check if acpi # was used and do nothing if so obj-$(CONFIG_PNP) += pnp/ diff --git a/drivers/sfi/Makefile b/drivers/sfi/Makefile new file mode 100644 index 0000000..f176470 --- /dev/null +++ b/drivers/sfi/Makefile @@ -0,0 +1 @@ +obj-y += sfi_core.o diff --git a/drivers/sfi/sfi_core.c b/drivers/sfi/sfi_core.c new file mode 100644 index 0000000..f9a9849 --- /dev/null +++ b/drivers/sfi/sfi_core.c @@ -0,0 +1,385 @@ +/* sfi_core.c Simple Firmware Interface - core internals */ + +/* + * Copyright (C) 2009, Intel Corp. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + */ + +#define KMSG_COMPONENT "SFI" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "sfi_core.h" + +#define ON_SAME_PAGE(addr1, addr2) \ + (((unsigned long)(addr1) & PAGE_MASK) == \ + ((unsigned long)(addr2) & PAGE_MASK)) +#define TABLE_ON_PAGE(page, table, size) (ON_SAME_PAGE(page, table) && \ + ON_SAME_PAGE(page, table + size)) + +int sfi_disabled __read_mostly; +EXPORT_SYMBOL(sfi_disabled); + +static u64 syst_pa __read_mostly; +static struct sfi_table_simple *syst_va __read_mostly; + +/* + * FW creates and saves the SFI tables in memory. When these tables get + * used, they may need to be mapped to virtual address space, and the mapping + * can happen before or after the ioremap() is ready, so a flag is needed + * to indicating this + */ +static u32 sfi_use_ioremap __read_mostly; + +static void __iomem *sfi_map_memory(u64 phys, u32 size) +{ + if (!phys || !size) + return NULL; + + if (sfi_use_ioremap) + return ioremap(phys, size); + else + return early_ioremap(phys, size); +} + +static void sfi_unmap_memory(void __iomem *virt, u32 size) +{ + if (!virt || !size) + return; + + if (sfi_use_ioremap) + iounmap(virt); + else + early_iounmap(virt, size); +} + +static void sfi_print_table_header(unsigned long long pa, + struct sfi_table_header *header) +{ + pr_info("%4.4s %llX, %04X (v%d %6.6s %8.8s)\n", + header->signature, pa, + header->length, header->revision, header->oem_id, + header->oem_table_id); +} + +/* + * sfi_verify_table() + * sanity check table lengh, calculate checksum + */ +static __init int sfi_verify_table(struct sfi_table_header *table) +{ + + u8 checksum = 0; + u8 *puchar = (u8 *)table; + u32 length = table->length; + + /* Sanity check table length against arbitrary 1MB limit */ + if (length > 0x100000) { + pr_err("Invalid table length 0x%x\n", length); + return -1; + } + + while (length--) + checksum += *puchar++; + + if (checksum) { + pr_err("Checksum %2.2X should be %2.2X\n", + table->checksum, table->checksum - checksum); + return -1; + } + return 0; +} + +/* + * sfi_map_table() + * + * Return address of mapped table + * Check for common case that we can re-use mapping to SYST, + * which requires syst_pa, syst_va to be initialized. + */ +struct sfi_table_header *sfi_map_table(u64 pa) +{ + struct sfi_table_header *th; + u32 length; + + if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header))) + th = sfi_map_memory(pa, sizeof(struct sfi_table_header)); + else + th = (void *)syst_va - (syst_pa - pa); + + /* If table fits on same page as its header, we are done */ + if (TABLE_ON_PAGE(th, th, th->length)) + return th; + + /* entire table does not fit on same page as SYST */ + length = th->length; + if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header))) + sfi_unmap_memory(th, sizeof(struct sfi_table_header)); + + return sfi_map_memory(pa, length); +} + +/* + * sfi_unmap_table() + * + * undoes effect of sfi_map_table() by unmapping table + * if it did not completely fit on same page as SYST. + */ +void sfi_unmap_table(struct sfi_table_header *th) +{ + if (!TABLE_ON_PAGE(syst_va, th, th->length)) + sfi_unmap_memory(th, TABLE_ON_PAGE(th, th, th->length) ? + sizeof(*th) : th->length); +} + +/* + * sfi_get_table() + * + * Search SYST for the specified table. + * return the mapped table + */ +static struct sfi_table_header *sfi_get_table(char *signature, char *oem_id, + char *oem_table_id, unsigned int flags) +{ + struct sfi_table_header *th; + u32 tbl_cnt, i; + + tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64); + + for (i = 0; i < tbl_cnt; i++) { + th = sfi_map_table(syst_va->pentry[i]); + if (!th) + return NULL; + + if (strncmp(th->signature, signature, SFI_SIGNATURE_SIZE)) + goto loop_continue; + + if (oem_id && strncmp(th->oem_id, oem_id, SFI_OEM_ID_SIZE)) + goto loop_continue; + + if (oem_table_id && strncmp(th->oem_table_id, oem_table_id, + SFI_OEM_TABLE_ID_SIZE)) + goto loop_continue; + + return th; /* success */ +loop_continue: + sfi_unmap_table(th); + } + + return NULL; +} + +void sfi_put_table(struct sfi_table_header *table) +{ + if (!ON_SAME_PAGE(((void *)table + table->length), + (void *)syst_va + syst_va->header.length) + && !ON_SAME_PAGE(table, syst_va)) + sfi_unmap_memory(table, table->length); +} + +/* find table with signature, run handler on it */ +int sfi_table_parse(char *signature, char *oem_id, char *oem_table_id, + unsigned int flags, sfi_table_handler handler) +{ + int ret = 0; + struct sfi_table_header *table = NULL; + + if (sfi_disabled || !handler || !signature) + return -EINVAL; + + table = sfi_get_table(signature, oem_id, oem_table_id, flags); + if (!table) + return -EINVAL; + + ret = handler(table); + sfi_put_table(table); + return ret; +} +EXPORT_SYMBOL_GPL(sfi_table_parse); + +/* + * sfi_check_table(pa) + */ +int __init sfi_check_table(u64 pa) +{ + struct sfi_table_header *th; + int ret; + + th = sfi_map_table(pa); + if (!th) + return -1; + + sfi_print_table_header(pa, th); + ret = sfi_verify_table(th); + + sfi_unmap_table(th); + + return ret; +} + +/* + * sfi_parse_syst() + * checksum all the tables in SYST and print their headers + * + * success: set syst_va, return 0 + */ +static int __init sfi_parse_syst(void) +{ + int tbl_cnt, i; + + syst_va = sfi_map_memory(syst_pa, sizeof(struct sfi_table_simple)); + if (!syst_va) + return -1; + + tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64); + for (i = 0; i < tbl_cnt; i++) { + if (sfi_check_table(syst_va->pentry[i])) + return -1; + } + + return 0; +} + +/* + * The OS finds the System Table by searching 16-byte boundaries between + * physical address 0x000E0000 and 0x000FFFFF. The OS shall search this region + * starting at the low address and shall stop searching when the 1st valid SFI + * System Table is found. + * + * success: set syst_pa, return 0 + * fail: return -1 + */ +static __init int sfi_find_syst(void) +{ + unsigned long offset, len; + void *start; + + len = SFI_SYST_SEARCH_END - SFI_SYST_SEARCH_BEGIN; + start = sfi_map_memory(SFI_SYST_SEARCH_BEGIN, len); + if (!start) + return -1; + + for (offset = 0; offset < len; offset += 16) { + struct sfi_table_header *syst_hdr; + + syst_hdr = start + offset; + if (strncmp(syst_hdr->signature, SFI_SIG_SYST, + SFI_SIGNATURE_SIZE)) + continue; + + if (syst_hdr->length > PAGE_SIZE) + continue; + + sfi_print_table_header(SFI_SYST_SEARCH_BEGIN + offset, + syst_hdr); + + if (sfi_verify_table(syst_hdr)) + continue; + + /* + * Enforce SFI spec mandate that SYST reside within a page. + */ + if (!ON_SAME_PAGE(syst_pa, syst_pa + syst_hdr->length)) { + pr_debug("SYST 0x%llx + 0x%x crosses page\n", + syst_pa, syst_hdr->length); + continue; + } + + /* success */ + syst_pa = SFI_SYST_SEARCH_BEGIN + offset; + sfi_unmap_memory(start, len); + return 0; + } + + sfi_unmap_memory(start, len); + return -1; +} + +void __init sfi_init(void) +{ + if (!acpi_disabled) + disable_sfi(); + + if (sfi_disabled) + return; + + pr_info("Simple Firmware Interface v0.7 http://simplefirmware.org\n"); + + if (sfi_find_syst() || sfi_parse_syst()) + disable_sfi(); + + return; +} + +void __init sfi_init_late(void) +{ + int length; + + if (sfi_disabled) + return; + + length = syst_va->header.length; + sfi_unmap_memory(syst_va, sizeof(struct sfi_table_simple)); + + /* use ioremap now after it is ready */ + sfi_use_ioremap = 1; + syst_va = sfi_map_memory(syst_pa, length); +} + +static int __init sfi_parse_cmdline(char *arg) +{ + if (!arg) + return -EINVAL; + + if (!strcmp(arg, "off")) + sfi_disabled = 1; + + return 0; +} + +early_param("sfi", sfi_parse_cmdline); diff --git a/drivers/sfi/sfi_core.h b/drivers/sfi/sfi_core.h new file mode 100644 index 0000000..cb599bf --- /dev/null +++ b/drivers/sfi/sfi_core.h @@ -0,0 +1,44 @@ +/* sfi_core.h Simple Firmware Interface, internal header */ + +/* + * Copyright (C) 2009, Intel Corp. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + */ + +extern int __init sfi_acpi_init(void); +extern int sfi_check_table(u64 paddr); +extern void sfi_put_table(struct sfi_table_header *table); +extern struct sfi_table_header *sfi_map_table(u64 pa); +extern void sfi_unmap_table(struct sfi_table_header *th); -- 1.6.0.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/