cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cpucfg-emul.h (1768B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ASM_MACH_LOONGSON64_CPUCFG_EMUL_H_
      3#define _ASM_MACH_LOONGSON64_CPUCFG_EMUL_H_
      4
      5#include <asm/cpu-info.h>
      6
      7#ifdef CONFIG_CPU_LOONGSON3_CPUCFG_EMULATION
      8
      9#include <loongson_regs.h>
     10
     11#define LOONGSON_FPREV_MASK 0x7
     12
     13void loongson3_cpucfg_synthesize_data(struct cpuinfo_mips *c);
     14
     15static inline bool loongson3_cpucfg_emulation_enabled(struct cpuinfo_mips *c)
     16{
     17	/* All supported cores have non-zero LOONGSON_CFG1 data. */
     18	return c->loongson3_cpucfg_data[0] != 0;
     19}
     20
     21static inline u32 loongson3_cpucfg_read_synthesized(struct cpuinfo_mips *c,
     22	__u64 sel)
     23{
     24	switch (sel) {
     25	case LOONGSON_CFG0:
     26		return c->processor_id;
     27	case LOONGSON_CFG1:
     28	case LOONGSON_CFG2:
     29	case LOONGSON_CFG3:
     30		return c->loongson3_cpucfg_data[sel - 1];
     31	case LOONGSON_CFG4:
     32	case LOONGSON_CFG5:
     33		/* CPUCFG selects 4 and 5 are related to the input clock
     34		 * signal.
     35		 *
     36		 * Unimplemented for now.
     37		 */
     38		return 0;
     39	case LOONGSON_CFG6:
     40		/* CPUCFG select 6 is for the undocumented Safe Extension. */
     41		return 0;
     42	case LOONGSON_CFG7:
     43		/* CPUCFG select 7 is for the virtualization extension.
     44		 * We don't know if the two currently known features are
     45		 * supported on older cores according to the public
     46		 * documentation, so leave this at zero.
     47		 */
     48		return 0;
     49	}
     50
     51	/*
     52	 * Return 0 for unrecognized CPUCFG selects, which is real hardware
     53	 * behavior observed on Loongson 3A R4.
     54	 */
     55	return 0;
     56}
     57#else
     58static inline void loongson3_cpucfg_synthesize_data(struct cpuinfo_mips *c)
     59{
     60}
     61
     62static inline bool loongson3_cpucfg_emulation_enabled(struct cpuinfo_mips *c)
     63{
     64	return false;
     65}
     66
     67static inline u32 loongson3_cpucfg_read_synthesized(struct cpuinfo_mips *c,
     68	__u64 sel)
     69{
     70	return 0;
     71}
     72#endif
     73
     74#endif /* _ASM_MACH_LOONGSON64_CPUCFG_EMUL_H_ */