arch/riscv/include/asm/semihost.h

File Facts

System

Linux kernel

Corpus path

arch/riscv/include/asm/semihost.h

Extension

.h

Size

596 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.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• struct uart_port
• function smh_putc

Annotated Snippet

#ifndef _RISCV_SEMIHOST_H_
#define _RISCV_SEMIHOST_H_

struct uart_port;

static inline void smh_putc(struct uart_port *port, unsigned char c)
{
	asm volatile("addi    a1, %0, 0\n"
		     "addi    a0, zero, 3\n"
		     ".balign 16\n"
		     ".option push\n"
		     ".option norvc\n"
		     "slli    zero, zero, 0x1f\n"
		     "ebreak\n"
		     "srai    zero, zero, 0x7\n"
		     ".option pop\n"
		     : : "r" (&c) : "a0", "a1", "memory");
}

#endif /* _RISCV_SEMIHOST_H_ */

Annotation

• Detected declarations: `struct uart_port`, `function smh_putc`.
• Atlas domain: Architecture Layer / arch/riscv.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.