1a36a39e22
To collect the CPU registers of the crashed system allocated a single page with memblock_alloc_base and use it as a copy buffer. Replace the stop-and-store-status sigp with a store-status-at-address sigp in smp_save_dump_cpus() and smp_store_status(). In both cases the target CPU is already stopped and store-status-at-address avoids the detour via the absolute zero page. For kexec simplify s390_reset_system and call store_status() before the prefix register of the boot CPU has been set to zero. Use STPX to store the prefix register and remove dump_prefix_page. Acked-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
/*
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* FPU state and register content conversion primitives
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*
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* Copyright IBM Corp. 2015
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* Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
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*/
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#ifndef _ASM_S390_FPU_INTERNAL_H
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#define _ASM_S390_FPU_INTERNAL_H
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#include <linux/string.h>
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#include <asm/ctl_reg.h>
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#include <asm/fpu/types.h>
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static inline void save_vx_regs(__vector128 *vxrs)
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{
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asm volatile(
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" la 1,%0\n"
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" .word 0xe70f,0x1000,0x003e\n" /* vstm 0,15,0(1) */
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" .word 0xe70f,0x1100,0x0c3e\n" /* vstm 16,31,256(1) */
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: "=Q" (*(struct vx_array *) vxrs) : : "1");
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}
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static inline void convert_vx_to_fp(freg_t *fprs, __vector128 *vxrs)
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{
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int i;
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for (i = 0; i < __NUM_FPRS; i++)
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fprs[i] = *(freg_t *)(vxrs + i);
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}
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static inline void convert_fp_to_vx(__vector128 *vxrs, freg_t *fprs)
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{
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int i;
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for (i = 0; i < __NUM_FPRS; i++)
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*(freg_t *)(vxrs + i) = fprs[i];
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}
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static inline void fpregs_store(_s390_fp_regs *fpregs, struct fpu *fpu)
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{
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fpregs->pad = 0;
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if (MACHINE_HAS_VX)
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convert_vx_to_fp((freg_t *)&fpregs->fprs, fpu->vxrs);
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else
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memcpy((freg_t *)&fpregs->fprs, fpu->fprs,
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sizeof(fpregs->fprs));
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}
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static inline void fpregs_load(_s390_fp_regs *fpregs, struct fpu *fpu)
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{
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if (MACHINE_HAS_VX)
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convert_fp_to_vx(fpu->vxrs, (freg_t *)&fpregs->fprs);
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else
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memcpy(fpu->fprs, (freg_t *)&fpregs->fprs,
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sizeof(fpregs->fprs));
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}
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#endif /* _ASM_S390_FPU_INTERNAL_H */
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