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smp_ops providers do not modify their ops structures, so they should be made const for robustness. Since currently the MIPS kernel is not mapped with memory protection, this does not in itself provide any security benefit, but it still makes sense to make this change. There are also slight code size efficincies from the structure being made read-only, saving 128 bytes of kernel text on a pistachio_defconfig. Before: text data bss dec hex filename 7187239 1772752 470224 9430215 8fe4c7 vmlinux After: text data bss dec hex filename 7187111 1772752 470224 9430087 8fe447 vmlinux Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Marcin Nowakowski <marcin.nowakowski@imgtec.com> Cc: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Huacai Chen <chenhc@lemote.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Kevin Cernekee <cernekee@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Doug Ledford <dledford@redhat.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: Joe Perches <joe@perches.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Burton <paul.burton@imgtec.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Steven J. Hill <steven.hill@cavium.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/16784/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
145 lines
3.4 KiB
C
145 lines
3.4 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) 2011 by Kevin Cernekee (cernekee@gmail.com)
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*
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* Definitions for BMIPS processors
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*/
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#ifndef _ASM_BMIPS_H
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#define _ASM_BMIPS_H
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#include <linux/compiler.h>
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#include <linux/linkage.h>
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#include <asm/addrspace.h>
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#include <asm/mipsregs.h>
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#include <asm/hazards.h>
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/* NOTE: the CBR register returns a PA, and it can be above 0xff00_0000 */
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#define BMIPS_GET_CBR() ((void __iomem *)(CKSEG1 | \
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(unsigned long) \
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((read_c0_brcm_cbr() >> 18) << 18)))
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#define BMIPS_RAC_CONFIG 0x00000000
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#define BMIPS_RAC_ADDRESS_RANGE 0x00000004
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#define BMIPS_RAC_CONFIG_1 0x00000008
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#define BMIPS_L2_CONFIG 0x0000000c
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#define BMIPS_LMB_CONTROL 0x0000001c
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#define BMIPS_SYSTEM_BASE 0x00000020
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#define BMIPS_PERF_GLOBAL_CONTROL 0x00020000
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#define BMIPS_PERF_CONTROL_0 0x00020004
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#define BMIPS_PERF_CONTROL_1 0x00020008
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#define BMIPS_PERF_COUNTER_0 0x00020010
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#define BMIPS_PERF_COUNTER_1 0x00020014
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#define BMIPS_PERF_COUNTER_2 0x00020018
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#define BMIPS_PERF_COUNTER_3 0x0002001c
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#define BMIPS_RELO_VECTOR_CONTROL_0 0x00030000
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#define BMIPS_RELO_VECTOR_CONTROL_1 0x00038000
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#define BMIPS_NMI_RESET_VEC 0x80000000
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#define BMIPS_WARM_RESTART_VEC 0x80000380
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#define ZSCM_REG_BASE 0x97000000
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#if !defined(__ASSEMBLY__)
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#include <linux/cpumask.h>
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#include <asm/r4kcache.h>
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#include <asm/smp-ops.h>
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extern const struct plat_smp_ops bmips43xx_smp_ops;
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extern const struct plat_smp_ops bmips5000_smp_ops;
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static inline int register_bmips_smp_ops(void)
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{
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#if IS_ENABLED(CONFIG_CPU_BMIPS) && IS_ENABLED(CONFIG_SMP)
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switch (current_cpu_type()) {
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case CPU_BMIPS32:
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case CPU_BMIPS3300:
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return register_up_smp_ops();
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case CPU_BMIPS4350:
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case CPU_BMIPS4380:
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register_smp_ops(&bmips43xx_smp_ops);
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break;
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case CPU_BMIPS5000:
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register_smp_ops(&bmips5000_smp_ops);
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break;
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default:
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return -ENODEV;
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}
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return 0;
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#else
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return -ENODEV;
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#endif
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}
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extern char bmips_reset_nmi_vec;
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extern char bmips_reset_nmi_vec_end;
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extern char bmips_smp_movevec;
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extern char bmips_smp_int_vec;
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extern char bmips_smp_int_vec_end;
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extern int bmips_smp_enabled;
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extern int bmips_cpu_offset;
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extern cpumask_t bmips_booted_mask;
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extern unsigned long bmips_tp1_irqs;
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extern void bmips_ebase_setup(void);
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extern asmlinkage void plat_wired_tlb_setup(void);
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extern void bmips_cpu_setup(void);
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static inline unsigned long bmips_read_zscm_reg(unsigned int offset)
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{
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unsigned long ret;
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barrier();
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cache_op(Index_Load_Tag_S, ZSCM_REG_BASE + offset);
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__sync();
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_ssnop();
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_ssnop();
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_ssnop();
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_ssnop();
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_ssnop();
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_ssnop();
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_ssnop();
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ret = read_c0_ddatalo();
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_ssnop();
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return ret;
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}
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static inline void bmips_write_zscm_reg(unsigned int offset, unsigned long data)
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{
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write_c0_ddatalo(data);
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_ssnop();
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_ssnop();
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_ssnop();
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cache_op(Index_Store_Tag_S, ZSCM_REG_BASE + offset);
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_ssnop();
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_ssnop();
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_ssnop();
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barrier();
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}
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static inline void bmips_post_dma_flush(struct device *dev)
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{
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void __iomem *cbr = BMIPS_GET_CBR();
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u32 cfg;
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if (boot_cpu_type() != CPU_BMIPS3300 &&
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boot_cpu_type() != CPU_BMIPS4350 &&
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boot_cpu_type() != CPU_BMIPS4380)
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return;
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/* Flush stale data out of the readahead cache */
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cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
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__raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
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__raw_readl(cbr + BMIPS_RAC_CONFIG);
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}
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#endif /* !defined(__ASSEMBLY__) */
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#endif /* _ASM_BMIPS_H */
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