On Tue, Mar 24, 2015 at 10:02:37PM +0800, Hanjun Guo wrote: > From: Al Stone <al.stone@xxxxxxxxxx> > > 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 <catalin.marinas@xxxxxxx> > CC: Will Deacon <will.deacon@xxxxxxx> > CC: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> > Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx> > Tested-by: Yijing Wang <wangyijing@xxxxxxxxxx> > Tested-by: Mark Langsdorf <mlangsdo@xxxxxxxxxx> > Tested-by: Jon Masters <jcm@xxxxxxxxxx> > Tested-by: Timur Tabi <timur@xxxxxxxxxxxxxx> > Tested-by: Robert Richter <rrichter@xxxxxxxxxx> > Acked-by: Robert Richter <rrichter@xxxxxxxxxx> > Acked-by: Olof Johansson <olof@xxxxxxxxx> > Acked-by: Grant Likely <grant.likely@xxxxxxxxxx> > Signed-off-by: Al Stone <al.stone@xxxxxxxxxx> > Signed-off-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx> > Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx> > Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
