arch/riscv/include/asm/assembler.h
Source file repositories/reference/linux-study-clean/arch/riscv/include/asm/assembler.h
File Facts
- System
- Linux kernel
- Corpus path
arch/riscv/include/asm/assembler.h- Extension
.h- Size
- 3456 bytes
- Lines
- 127
- 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
asm/asm.hasm/asm-offsets.hasm/csr.h
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
#ifndef __ASSEMBLER__
#error "Only include this from assembly code"
#endif
#ifndef __ASM_ASSEMBLER_H
#define __ASM_ASSEMBLER_H
#include <asm/asm.h>
#include <asm/asm-offsets.h>
#include <asm/csr.h>
/*
* suspend_restore_csrs - restore CSRs
*/
.macro suspend_restore_csrs
REG_L t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)
csrw CSR_EPC, t0
REG_L t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)
csrw CSR_STATUS, t0
REG_L t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)
csrw CSR_TVAL, t0
REG_L t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)
csrw CSR_CAUSE, t0
.endm
/*
* suspend_restore_regs - Restore registers (except A0 and T0-T6)
*/
.macro suspend_restore_regs
REG_L ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)
REG_L sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)
REG_L gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)
REG_L tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)
REG_L s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)
REG_L s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)
REG_L a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)
REG_L a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)
REG_L a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)
REG_L a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)
REG_L a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)
REG_L a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)
REG_L a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)
REG_L s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)
REG_L s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)
REG_L s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)
REG_L s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)
REG_L s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)
REG_L s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)
REG_L s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)
REG_L s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)
REG_L s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)
REG_L s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)
.endm
/*
* copy_page - copy 1 page (4KB) of data from source to destination
* @a0 - destination
* @a1 - source
*/
.macro copy_page a0, a1
lui a2, 0x1
add a2, a2, a0
1 :
REG_L t0, 0(a1)
REG_L t1, SZREG(a1)
REG_S t0, 0(a0)
REG_S t1, SZREG(a0)
addi a0, a0, 2 * SZREG
addi a1, a1, 2 * SZREG
bne a2, a0, 1b
.endm
#endif /* __ASM_ASSEMBLER_H */
#if defined(VDSO_CFI) && (__riscv_xlen == 64)
.macro vdso_lpad, label = 0
lpad \label
.endm
#else
.macro vdso_lpad, label = 0
.endm
#endif
/*
* This macro emits a program property note section identifying
* architecture features which require special handling, mainly for
* use in assembly files included in the VDSO.
*/
Annotation
- Immediate include surface: `asm/asm.h`, `asm/asm-offsets.h`, `asm/csr.h`.
- 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.