arch/riscv/include/asm/mmio.h
Source file repositories/reference/linux-study-clean/arch/riscv/include/asm/mmio.h
File Facts
- System
- Linux kernel
- Corpus path
arch/riscv/include/asm/mmio.h- Extension
.h- Size
- 5292 bytes
- Lines
- 153
- 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.
Dependency Surface
linux/types.hasm/fence.hasm/mmiowb.h
Detected Declarations
function Copyrightfunction __raw_writewfunction __raw_writelfunction __raw_writeqfunction __raw_readbfunction __raw_readwfunction __raw_readlfunction __raw_readq
Annotated Snippet
#ifndef _ASM_RISCV_MMIO_H
#define _ASM_RISCV_MMIO_H
#include <linux/types.h>
#include <asm/fence.h>
#include <asm/mmiowb.h>
/* Generic IO read/write. These perform native-endian accesses. */
#define __raw_writeb __raw_writeb
static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
{
asm volatile("sb %0, 0(%1)" : : "r" (val), "r" (addr));
}
#define __raw_writew __raw_writew
static inline void __raw_writew(u16 val, volatile void __iomem *addr)
{
asm volatile("sh %0, 0(%1)" : : "r" (val), "r" (addr));
}
#define __raw_writel __raw_writel
static inline void __raw_writel(u32 val, volatile void __iomem *addr)
{
asm volatile("sw %0, 0(%1)" : : "r" (val), "r" (addr));
}
#ifdef CONFIG_64BIT
#define __raw_writeq __raw_writeq
static inline void __raw_writeq(u64 val, volatile void __iomem *addr)
{
asm volatile("sd %0, 0(%1)" : : "r" (val), "r" (addr));
}
#endif
#define __raw_readb __raw_readb
static inline u8 __raw_readb(const volatile void __iomem *addr)
{
u8 val;
asm volatile("lb %0, 0(%1)" : "=r" (val) : "r" (addr));
return val;
}
#define __raw_readw __raw_readw
static inline u16 __raw_readw(const volatile void __iomem *addr)
{
u16 val;
asm volatile("lh %0, 0(%1)" : "=r" (val) : "r" (addr));
return val;
}
#define __raw_readl __raw_readl
static inline u32 __raw_readl(const volatile void __iomem *addr)
{
u32 val;
asm volatile("lw %0, 0(%1)" : "=r" (val) : "r" (addr));
return val;
}
#ifdef CONFIG_64BIT
#define __raw_readq __raw_readq
static inline u64 __raw_readq(const volatile void __iomem *addr)
{
u64 val;
asm volatile("ld %0, 0(%1)" : "=r" (val) : "r" (addr));
return val;
}
#endif
/*
* Unordered I/O memory access primitives. These are even more relaxed than
* the relaxed versions, as they don't even order accesses between successive
* operations to the I/O regions.
*/
#define readb_cpu(c) ({ u8 __r = __raw_readb(c); __r; })
#define readw_cpu(c) ({ u16 __r = le16_to_cpu((__force __le16)__raw_readw(c)); __r; })
#define readl_cpu(c) ({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; })
#define writeb_cpu(v, c) ((void)__raw_writeb((v), (c)))
#define writew_cpu(v, c) ((void)__raw_writew((__force u16)cpu_to_le16(v), (c)))
#define writel_cpu(v, c) ((void)__raw_writel((__force u32)cpu_to_le32(v), (c)))
#ifdef CONFIG_64BIT
#define readq_cpu(c) ({ u64 __r = le64_to_cpu((__force __le64)__raw_readq(c)); __r; })
#define writeq_cpu(v, c) ((void)__raw_writeq((__force u64)cpu_to_le64(v), (c)))
#endif
Annotation
- Immediate include surface: `linux/types.h`, `asm/fence.h`, `asm/mmiowb.h`.
- Detected declarations: `function Copyright`, `function __raw_writew`, `function __raw_writel`, `function __raw_writeq`, `function __raw_readb`, `function __raw_readw`, `function __raw_readl`, `function __raw_readq`.
- 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.