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riscv: Using CSR numbers to access CSRs 

Since commit a3182c91ef ("RISC-V: Access CSRs using CSR numbers"),
we should prefer accessing CSRs using their CSR numbers, but there
are several leftovers like sstatus / sptbr we missed.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
This commit is contained in:
Bin Meng 2019-08-07 09:13:38 -07:00 committed by Paul Walmsley
parent 015b269337
commit 4f3f900846
6 changed files with 16 additions and 21 deletions
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6
arch/riscv/kernel/entry.S
View File

@ -167,7 +167,7 @@ ENTRY(handle_exception)
tail do_IRQ
1:
/* Exceptions run with interrupts enabled */
csrs sstatus, SR_SIE
csrs CSR_SSTATUS, SR_SIE
/* Handle syscalls */
li t0, EXC_SYSCALL
@ -222,7 +222,7 @@ ret_from_syscall:
ret_from_exception:
REG_L s0, PT_SSTATUS(sp)
csrc sstatus, SR_SIE
csrc CSR_SSTATUS, SR_SIE
andi s0, s0, SR_SPP
bnez s0, resume_kernel
@ -265,7 +265,7 @@ work_pending:
bnez s1, work_resched
work_notifysig:
/* Handle pending signals and notify-resume requests */
csrs sstatus, SR_SIE /* Enable interrupts for do_notify_resume() */
csrs CSR_SSTATUS, SR_SIE /* Enable interrupts for do_notify_resume() */
move a0, sp /* pt_regs */
move a1, s0 /* current_thread_info->flags */
tail do_notify_resume

8
arch/riscv/kernel/fpu.S
View File

@ -23,7 +23,7 @@ ENTRY(__fstate_save)
li a2, TASK_THREAD_F0
add a0, a0, a2
li t1, SR_FS
csrs sstatus, t1
csrs CSR_SSTATUS, t1
frcsr t0
fsd f0, TASK_THREAD_F0_F0(a0)
fsd f1, TASK_THREAD_F1_F0(a0)
@ -58,7 +58,7 @@ ENTRY(__fstate_save)
fsd f30, TASK_THREAD_F30_F0(a0)
fsd f31, TASK_THREAD_F31_F0(a0)
sw t0, TASK_THREAD_FCSR_F0(a0)
csrc sstatus, t1
csrc CSR_SSTATUS, t1
ret
ENDPROC(__fstate_save)
@ -67,7 +67,7 @@ ENTRY(__fstate_restore)
add a0, a0, a2
li t1, SR_FS
lw t0, TASK_THREAD_FCSR_F0(a0)
csrs sstatus, t1
csrs CSR_SSTATUS, t1
fld f0, TASK_THREAD_F0_F0(a0)
fld f1, TASK_THREAD_F1_F0(a0)
fld f2, TASK_THREAD_F2_F0(a0)
@ -101,6 +101,6 @@ ENTRY(__fstate_restore)
fld f30, TASK_THREAD_F30_F0(a0)
fld f31, TASK_THREAD_F31_F0(a0)
fscsr t0
csrc sstatus, t1
csrc CSR_SSTATUS, t1
ret
ENDPROC(__fstate_restore)

2
arch/riscv/kernel/head.S
View File

@ -61,7 +61,7 @@ _start_kernel:
* floating point in kernel space
*/
li t0, SR_FS
csrc sstatus, t0
csrc CSR_SSTATUS, t0
/* Pick one hart to run the main boot sequence */
la a3, hart_lottery

12
arch/riscv/lib/uaccess.S
View File

@ -18,7 +18,7 @@ ENTRY(__asm_copy_from_user)
/* Enable access to user memory */
li t6, SR_SUM
csrs sstatus, t6
csrs CSR_SSTATUS, t6
add a3, a1, a2
/* Use word-oriented copy only if low-order bits match */
@ -47,7 +47,7 @@ ENTRY(__asm_copy_from_user)
3:
/* Disable access to user memory */
csrc sstatus, t6
csrc CSR_SSTATUS, t6
li a0, 0
ret
4: /* Edge case: unalignment */
@ -72,7 +72,7 @@ ENTRY(__clear_user)
/* Enable access to user memory */
li t6, SR_SUM
csrs sstatus, t6
csrs CSR_SSTATUS, t6
add a3, a0, a1
addi t0, a0, SZREG-1
@ -94,7 +94,7 @@ ENTRY(__clear_user)
3:
/* Disable access to user memory */
csrc sstatus, t6
csrc CSR_SSTATUS, t6
li a0, 0
ret
4: /* Edge case: unalignment */
@ -114,11 +114,11 @@ ENDPROC(__clear_user)
/* Fixup code for __copy_user(10) and __clear_user(11) */
10:
/* Disable access to user memory */
csrs sstatus, t6
csrs CSR_SSTATUS, t6
mv a0, a2
ret
11:
csrs sstatus, t6
csrs CSR_SSTATUS, t6
mv a0, a1
ret
.previous

7
arch/riscv/mm/context.c
View File

@ -57,12 +57,7 @@ void switch_mm(struct mm_struct *prev, struct mm_struct *next,
cpumask_clear_cpu(cpu, mm_cpumask(prev));
cpumask_set_cpu(cpu, mm_cpumask(next));
/*
* Use the old spbtr name instead of using the current satp
* name to support binutils 2.29 which doesn't know about the
* privileged ISA 1.10 yet.
*/
csr_write(sptbr, virt_to_pfn(next->pgd) | SATP_MODE);
csr_write(CSR_SATP, virt_to_pfn(next->pgd) | SATP_MODE);
local_flush_tlb_all();
flush_icache_deferred(next);

2
arch/riscv/mm/init.c
View File

@ -435,7 +435,7 @@ static void __init setup_vm_final(void)
clear_fixmap(FIX_PMD);
/* Move to swapper page table */
csr_write(sptbr, PFN_DOWN(__pa(swapper_pg_dir)) | SATP_MODE);
csr_write(CSR_SATP, PFN_DOWN(__pa(swapper_pg_dir)) | SATP_MODE);
local_flush_tlb_all();
}