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.

Dependency Surface

Detected Declarations

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

Implementation Notes