arch/riscv/kernel/fpu.S

Source file repositories/reference/linux-study-clean/arch/riscv/kernel/fpu.S

File Facts

System
Linux kernel
Corpus path
arch/riscv/kernel/fpu.S
Extension
.S
Size
6082 bytes
Lines
228
Domain
Architecture Layer
Bucket
arch/riscv
Inferred role
Architecture Layer: arch/riscv
Status
atlas-only

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

#include <linux/linkage.h>

#include <asm/asm.h>
#include <asm/csr.h>
#include <asm/asm-offsets.h>

SYM_FUNC_START(__fstate_save)
	li  a2,  TASK_THREAD_F0
	add a0, a0, a2
	li t1, SR_FS
	csrs CSR_STATUS, t1
	frcsr t0
	fsd f0,  TASK_THREAD_F0_F0(a0)
	fsd f1,  TASK_THREAD_F1_F0(a0)
	fsd f2,  TASK_THREAD_F2_F0(a0)
	fsd f3,  TASK_THREAD_F3_F0(a0)
	fsd f4,  TASK_THREAD_F4_F0(a0)
	fsd f5,  TASK_THREAD_F5_F0(a0)
	fsd f6,  TASK_THREAD_F6_F0(a0)
	fsd f7,  TASK_THREAD_F7_F0(a0)
	fsd f8,  TASK_THREAD_F8_F0(a0)
	fsd f9,  TASK_THREAD_F9_F0(a0)
	fsd f10, TASK_THREAD_F10_F0(a0)
	fsd f11, TASK_THREAD_F11_F0(a0)
	fsd f12, TASK_THREAD_F12_F0(a0)
	fsd f13, TASK_THREAD_F13_F0(a0)
	fsd f14, TASK_THREAD_F14_F0(a0)
	fsd f15, TASK_THREAD_F15_F0(a0)
	fsd f16, TASK_THREAD_F16_F0(a0)
	fsd f17, TASK_THREAD_F17_F0(a0)
	fsd f18, TASK_THREAD_F18_F0(a0)
	fsd f19, TASK_THREAD_F19_F0(a0)
	fsd f20, TASK_THREAD_F20_F0(a0)
	fsd f21, TASK_THREAD_F21_F0(a0)
	fsd f22, TASK_THREAD_F22_F0(a0)
	fsd f23, TASK_THREAD_F23_F0(a0)
	fsd f24, TASK_THREAD_F24_F0(a0)
	fsd f25, TASK_THREAD_F25_F0(a0)
	fsd f26, TASK_THREAD_F26_F0(a0)
	fsd f27, TASK_THREAD_F27_F0(a0)
	fsd f28, TASK_THREAD_F28_F0(a0)
	fsd f29, TASK_THREAD_F29_F0(a0)
	fsd f30, TASK_THREAD_F30_F0(a0)
	fsd f31, TASK_THREAD_F31_F0(a0)
	sw t0, TASK_THREAD_FCSR_F0(a0)
	csrc CSR_STATUS, t1
	ret
SYM_FUNC_END(__fstate_save)

SYM_FUNC_START(__fstate_restore)
	li  a2,  TASK_THREAD_F0
	add a0, a0, a2
	li t1, SR_FS
	lw t0, TASK_THREAD_FCSR_F0(a0)
	csrs CSR_STATUS, t1
	fld f0,  TASK_THREAD_F0_F0(a0)
	fld f1,  TASK_THREAD_F1_F0(a0)
	fld f2,  TASK_THREAD_F2_F0(a0)
	fld f3,  TASK_THREAD_F3_F0(a0)
	fld f4,  TASK_THREAD_F4_F0(a0)
	fld f5,  TASK_THREAD_F5_F0(a0)
	fld f6,  TASK_THREAD_F6_F0(a0)
	fld f7,  TASK_THREAD_F7_F0(a0)
	fld f8,  TASK_THREAD_F8_F0(a0)
	fld f9,  TASK_THREAD_F9_F0(a0)
	fld f10, TASK_THREAD_F10_F0(a0)
	fld f11, TASK_THREAD_F11_F0(a0)
	fld f12, TASK_THREAD_F12_F0(a0)
	fld f13, TASK_THREAD_F13_F0(a0)
	fld f14, TASK_THREAD_F14_F0(a0)

Annotation

Implementation Notes