arch/riscv/include/asm/clint.h

Source file repositories/reference/linux-study-clean/arch/riscv/include/asm/clint.h

File Facts

System
Linux kernel
Corpus path
arch/riscv/include/asm/clint.h
Extension
.h
Size
797 bytes
Lines
27
Domain
Architecture Layer
Bucket
arch/riscv
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_RISCV_CLINT_H
#define _ASM_RISCV_CLINT_H

#include <linux/types.h>
#include <asm/mmio.h>

#ifdef CONFIG_RISCV_M_MODE
/*
 * This lives in the CLINT driver, but is accessed directly by timex.h to avoid
 * any overhead when accessing the MMIO timer.
 *
 * The ISA defines mtime as a 64-bit memory-mapped register that increments at
 * a constant frequency, but it doesn't define some other constraints we depend
 * on (most notably ordering constraints, but also some simpler stuff like the
 * memory layout).  Thus, this is called "clint_time_val" instead of something
 * like "riscv_mtime", to signify that these non-ISA assumptions must hold.
 */
extern u64 __iomem *clint_time_val;
#endif

#endif

Annotation

Implementation Notes