6ce48897ce
Add kexec/kdump support for Loongson64 by:
1, Provide Loongson-specific kexec functions: loongson_kexec_prepare(),
loongson_kexec_shutdown() and loongson_crash_shutdown();
2, Provide Loongson-specific assembly code in kexec_smp_wait();
To start Loongson64, The boot CPU needs 3 parameters:
fw_arg0: the number of arguments in cmdline (i.e., argc).
fw_arg1: structure holds cmdline such as "root=/dev/sda1 console=tty"
(i.e., argv).
fw_arg2: environment (i.e., envp, additional boot parameters from LEFI).
Non-boot CPUs do not need one parameter as the IPI mailbox base address.
They query their own IPI mailbox to get PC, SP and GP in a loopi, until
the boot CPU brings them up.
loongson_kexec_prepare(): Setup cmdline for kexec/kdump. The kexec/kdump
cmdline comes from kexec's "append" option string. This structure will
be parsed in fw_init_cmdline() of arch/mips/fw/lib/cmdline.c. Both image
->control_code_page and the cmdline need to be in a safe memory region
(memory allocated by the old kernel may be corrupted by the new kernel).
In order to maintain compatibility for the old firmware, the low 2MB is
reserverd and safe for Loongson. So let KEXEC_CTRL_CODE and KEXEC_ARGV_
ADDR be here. LEFI parameters may be corrupted at runtime, so backup it
at mips_reboot_setup(), and then restore it at loongson_kexec_shutdown()
/loongson_crash_shutdown().
loongson_kexec_shutdown(): Wake up all present CPUs and let them go to
reboot_code_buffer. Pass the kexec parameters to kexec_args.
loongson_crash_shutdown(): Pass the kdump parameters to kexec_args.
The assembly part in kexec_smp_wait provide a routine as BIOS does, in
order to keep secondary CPUs in a querying loop.
The layout of low 2MB memory in our design:
0x80000000, the first MB, the first 64K, Exception vectors
0x80010000, the first MB, the second 64K, STR (suspend) data
0x80020000, the first MB, the third and fourth 64K, UEFI HOB
0x80040000, the first MB, the fifth 64K, RT-Thread for SMC
0x80100000, the second MB, the first 64K, KEXEC code
0x80108000, the second MB, the second 64K, KEXEC data
Cc: Eric Biederman <ebiederm@xmission.com>
Tested-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@kernel.org>
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2005 Embedded Alley Solutions, Inc
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* Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2009 Jiajie Chen (chenjiajie@cse.buaa.edu.cn)
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* Copyright (C) 2012 Huacai Chen (chenhc@lemote.com)
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*/
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#ifndef __ASM_MACH_LOONGSON64_KERNEL_ENTRY_H
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#define __ASM_MACH_LOONGSON64_KERNEL_ENTRY_H
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#include <asm/cpu.h>
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/*
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* Override macros used in arch/mips/kernel/head.S.
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*/
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.macro kernel_entry_setup
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.set push
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.set mips64
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/* Set ELPA on LOONGSON3 pagegrain */
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mfc0 t0, CP0_PAGEGRAIN
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or t0, (0x1 << 29)
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mtc0 t0, CP0_PAGEGRAIN
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/* Enable STFill Buffer */
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mfc0 t0, CP0_PRID
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/* Loongson-3A R4+ */
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andi t1, t0, PRID_IMP_MASK
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li t2, PRID_IMP_LOONGSON_64G
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beq t1, t2, 1f
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nop
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/* Loongson-3A R2/R3 */
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andi t0, (PRID_IMP_MASK | PRID_REV_MASK)
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slti t0, (PRID_IMP_LOONGSON_64C | PRID_REV_LOONGSON3A_R2_0)
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bnez t0, 2f
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nop
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1:
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mfc0 t0, CP0_CONFIG6
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or t0, 0x100
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mtc0 t0, CP0_CONFIG6
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2:
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_ehb
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.set pop
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.endm
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/*
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* Do SMP slave processor setup.
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*/
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.macro smp_slave_setup
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.set push
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.set mips64
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/* Set ELPA on LOONGSON3 pagegrain */
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mfc0 t0, CP0_PAGEGRAIN
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or t0, (0x1 << 29)
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mtc0 t0, CP0_PAGEGRAIN
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/* Enable STFill Buffer */
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mfc0 t0, CP0_PRID
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/* Loongson-3A R4+ */
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andi t1, t0, PRID_IMP_MASK
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li t2, PRID_IMP_LOONGSON_64G
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beq t1, t2, 1f
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nop
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/* Loongson-3A R2/R3 */
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andi t0, (PRID_IMP_MASK | PRID_REV_MASK)
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slti t0, (PRID_IMP_LOONGSON_64C | PRID_REV_LOONGSON3A_R2_0)
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bnez t0, 2f
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nop
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1:
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mfc0 t0, CP0_CONFIG6
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or t0, 0x100
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mtc0 t0, CP0_CONFIG6
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2:
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_ehb
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.set pop
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.endm
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#define USE_KEXEC_SMP_WAIT_FINAL
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.macro kexec_smp_wait_final
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/* s0:prid s1:initfn */
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/* a0:base t1:cpuid t2:node t9:count */
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mfc0 t1, CP0_EBASE
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andi t1, MIPS_EBASE_CPUNUM
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dins a0, t1, 8, 2 /* insert core id*/
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dext t2, t1, 2, 2
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dins a0, t2, 44, 2 /* insert node id */
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mfc0 s0, CP0_PRID
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andi s0, s0, (PRID_IMP_MASK | PRID_REV_MASK)
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beq s0, (PRID_IMP_LOONGSON_64C | PRID_REV_LOONGSON3B_R1), 1f
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beq s0, (PRID_IMP_LOONGSON_64C | PRID_REV_LOONGSON3B_R2), 1f
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b 2f /* Loongson-3A1000/3A2000/3A3000/3A4000 */
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1: dins a0, t2, 14, 2 /* Loongson-3B1000/3B1500 need bit 15~14 */
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2: li t9, 0x100 /* wait for init loop */
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3: addiu t9, -1 /* limit mailbox access */
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bnez t9, 3b
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lw s1, 0x20(a0) /* check PC as an indicator */
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beqz s1, 2b
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ld s1, 0x20(a0) /* get PC via mailbox reg0 */
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ld sp, 0x28(a0) /* get SP via mailbox reg1 */
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ld gp, 0x30(a0) /* get GP via mailbox reg2 */
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ld a1, 0x38(a0)
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jr s1 /* jump to initial PC */
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.endm
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#endif /* __ASM_MACH_LOONGSON64_KERNEL_ENTRY_H */
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