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MIPS: Octeon: Add support for accessing the boot vector.

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Used by the Octeon watchdog driver to get the address of the
firmware boot vector.

Signed-off-by: Steven J. Hill <steven.hill@cavium.com>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-watchdog@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17206/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Steven J. Hill 2017-08-29 10:40:31 -05:00 • committed by Ralf Baechle
parent d9a46c183a
commit 9438a86a07
5 changed files with 334 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

53
arch/mips/include/asm/octeon/cvmx-boot-vector.h Normal file
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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2003-2017 Cavium, Inc.
*/
#ifndef __CVMX_BOOT_VECTOR_H__
#define __CVMX_BOOT_VECTOR_H__
#include <asm/octeon/octeon.h>
/*
* The boot vector table is made up of an array of 1024 elements of
* struct cvmx_boot_vector_element. There is one entry for each
* possible MIPS CPUNum, indexed by the CPUNum.
*
* Once cvmx_boot_vector_get() returns a non-NULL value (indicating
* success), NMI to a core will cause execution to transfer to the
* target_ptr location for that core's entry in the vector table.
*
* The struct cvmx_boot_vector_element fields app0, app1, and app2 can
* be used by the application that has set the target_ptr in any
* application specific manner, they are not touched by the vectoring
* code.
*
* The boot vector code clobbers the CP0_DESAVE register, and on
* OCTEON II and later CPUs also clobbers CP0_KScratch2. All GP
* registers are preserved, except on pre-OCTEON II CPUs, where k1 is
* clobbered.
*
*/
/*
* Applications install the boot bus code in cvmx-boot-vector.c, which
* uses this magic:
*/
#define OCTEON_BOOT_MOVEABLE_MAGIC1 0xdb00110ad358eacdull
struct cvmx_boot_vector_element {
/* kseg0 or xkphys address of target code. */
uint64_t target_ptr;
/* Three application specific arguments. */
uint64_t app0;
uint64_t app1;
uint64_t app2;
};
struct cvmx_boot_vector_element *cvmx_boot_vector_get(void);
#endif /* __CVMX_BOOT_VECTOR_H__ */