From 37655163ce1a3ef2635a9bba0ad614f25e01484e Mon Sep 17 00:00:00 2001 From: Al Stone Date: Tue, 24 Mar 2015 14:02:37 +0000 Subject: ARM64 / ACPI: Get RSDP and ACPI boot-time tables As we want to get ACPI tables to parse and then use the information for system initialization, we should get the RSDP (Root System Description Pointer) first, it then locates Extended Root Description Table (XSDT) which contains all the 64-bit physical address that pointer to other boot-time tables. Introduce acpi.c and its related head file in this patch to provide fundamental needs of extern variables and functions for ACPI core, and then get boot-time tables as needed. - asm/acenv.h for arch specific ACPICA environments and implementation, It is needed unconditionally by ACPI core; - asm/acpi.h for arch specific variables and functions needed by ACPI driver core; - acpi.c for ARM64 related ACPI implementation for ACPI driver core; acpi_boot_table_init() is introduced to get RSDP and boot-time tables, it will be called in setup_arch() before paging_init(), so we should use eary_memremap() mechanism here to get the RSDP and all the table pointers. FADT Major.Minor version was introduced in ACPI 5.1, it is the same as ACPI version. In ACPI 5.1, some major gaps are fixed for ARM, such as updates in MADT table for GIC and SMP init, without those updates, we can not get the MPIDR for SMP init, and GICv2/3 related init information, so we can't boot arm64 ACPI properly with table versions predating 5.1. If firmware provides ACPI tables with ACPI version less than 5.1, OS has no way to retrieve the configuration data that is necessary to init SMP boot protocol and the GIC properly, so disable ACPI if we get an FADT table with version less that 5.1 when acpi_boot_table_init() called. CC: Catalin Marinas CC: Will Deacon CC: Lorenzo Pieralisi Tested-by: Suravee Suthikulpanit Tested-by: Yijing Wang Tested-by: Mark Langsdorf Tested-by: Jon Masters Tested-by: Timur Tabi Tested-by: Robert Richter Acked-by: Robert Richter Acked-by: Olof Johansson Acked-by: Grant Likely Signed-off-by: Al Stone Signed-off-by: Graeme Gregory Signed-off-by: Tomasz Nowicki Signed-off-by: Hanjun Guo Signed-off-by: Will Deacon --- arch/arm64/include/asm/acenv.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 arch/arm64/include/asm/acenv.h (limited to 'arch/arm64/include/asm/acenv.h') diff --git a/arch/arm64/include/asm/acenv.h b/arch/arm64/include/asm/acenv.h new file mode 100644 index 000000000000..b49166fde7ea --- /dev/null +++ b/arch/arm64/include/asm/acenv.h @@ -0,0 +1,18 @@ +/* + * ARM64 specific ACPICA environments and implementation + * + * Copyright (C) 2014, Linaro Ltd. + * Author: Hanjun Guo + * Author: Graeme Gregory + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef _ASM_ACENV_H +#define _ASM_ACENV_H + +/* It is required unconditionally by ACPI core, update it when needed. */ + +#endif /* _ASM_ACENV_H */ -- cgit v1.2.3