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-rw-r--r--arch/riscv/kernel/Makefile5
-rw-r--r--arch/riscv/kernel/asm-offsets.c8
-rw-r--r--arch/riscv/kernel/clint.c44
-rw-r--r--arch/riscv/kernel/entry.S85
-rw-r--r--arch/riscv/kernel/fpu.S8
-rw-r--r--arch/riscv/kernel/head.S112
-rw-r--r--arch/riscv/kernel/irq.c17
-rw-r--r--arch/riscv/kernel/perf_callchain.c2
-rw-r--r--arch/riscv/kernel/process.c17
-rw-r--r--arch/riscv/kernel/reset.c5
-rw-r--r--arch/riscv/kernel/sbi.c17
-rw-r--r--arch/riscv/kernel/setup.c2
-rw-r--r--arch/riscv/kernel/signal.c38
-rw-r--r--arch/riscv/kernel/smp.c16
-rw-r--r--arch/riscv/kernel/smpboot.c4
-rw-r--r--arch/riscv/kernel/traps.c16
16 files changed, 302 insertions, 94 deletions
diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
index 696020ff72db..f40205cb9a22 100644
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -25,10 +25,10 @@ obj-y += time.o
obj-y += traps.o
obj-y += riscv_ksyms.o
obj-y += stacktrace.o
-obj-y += vdso.o
obj-y += cacheinfo.o
-obj-y += vdso/
+obj-$(CONFIG_MMU) += vdso.o vdso/
+obj-$(CONFIG_RISCV_M_MODE) += clint.o
obj-$(CONFIG_FPU) += fpu.o
obj-$(CONFIG_SMP) += smpboot.o
obj-$(CONFIG_SMP) += smp.o
@@ -41,5 +41,6 @@ obj-$(CONFIG_DYNAMIC_FTRACE) += mcount-dyn.o
obj-$(CONFIG_PERF_EVENTS) += perf_event.o
obj-$(CONFIG_PERF_EVENTS) += perf_callchain.o
obj-$(CONFIG_HAVE_PERF_REGS) += perf_regs.o
+obj-$(CONFIG_RISCV_SBI) += sbi.o
clean:
diff --git a/arch/riscv/kernel/asm-offsets.c b/arch/riscv/kernel/asm-offsets.c
index 9f5628c38ac9..07cb9c10de4e 100644
--- a/arch/riscv/kernel/asm-offsets.c
+++ b/arch/riscv/kernel/asm-offsets.c
@@ -71,7 +71,7 @@ void asm_offsets(void)
OFFSET(TASK_THREAD_FCSR, task_struct, thread.fstate.fcsr);
DEFINE(PT_SIZE, sizeof(struct pt_regs));
- OFFSET(PT_SEPC, pt_regs, sepc);
+ OFFSET(PT_EPC, pt_regs, epc);
OFFSET(PT_RA, pt_regs, ra);
OFFSET(PT_FP, pt_regs, s0);
OFFSET(PT_S0, pt_regs, s0);
@@ -105,9 +105,9 @@ void asm_offsets(void)
OFFSET(PT_T6, pt_regs, t6);
OFFSET(PT_GP, pt_regs, gp);
OFFSET(PT_ORIG_A0, pt_regs, orig_a0);
- OFFSET(PT_SSTATUS, pt_regs, sstatus);
- OFFSET(PT_SBADADDR, pt_regs, sbadaddr);
- OFFSET(PT_SCAUSE, pt_regs, scause);
+ OFFSET(PT_STATUS, pt_regs, status);
+ OFFSET(PT_BADADDR, pt_regs, badaddr);
+ OFFSET(PT_CAUSE, pt_regs, cause);
/*
* THREAD_{F,X}* might be larger than a S-type offset can handle, but
diff --git a/arch/riscv/kernel/clint.c b/arch/riscv/kernel/clint.c
new file mode 100644
index 000000000000..3647980d14c3
--- /dev/null
+++ b/arch/riscv/kernel/clint.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 Christoph Hellwig.
+ */
+
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/types.h>
+#include <asm/clint.h>
+#include <asm/csr.h>
+#include <asm/timex.h>
+#include <asm/smp.h>
+
+/*
+ * This is the layout used by the SiFive clint, which is also shared by the qemu
+ * virt platform, and the Kendryte KD210 at least.
+ */
+#define CLINT_IPI_OFF 0
+#define CLINT_TIME_CMP_OFF 0x4000
+#define CLINT_TIME_VAL_OFF 0xbff8
+
+u32 __iomem *clint_ipi_base;
+
+void clint_init_boot_cpu(void)
+{
+ struct device_node *np;
+ void __iomem *base;
+
+ np = of_find_compatible_node(NULL, NULL, "riscv,clint0");
+ if (!np) {
+ panic("clint not found");
+ return;
+ }
+
+ base = of_iomap(np, 0);
+ if (!base)
+ panic("could not map CLINT");
+
+ clint_ipi_base = base + CLINT_IPI_OFF;
+ riscv_time_cmp = base + CLINT_TIME_CMP_OFF;
+ riscv_time_val = base + CLINT_TIME_VAL_OFF;
+
+ clint_clear_ipi(boot_cpu_hartid);
+}
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index c68b987e623e..a1349ca64669 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -26,14 +26,14 @@
/*
* If coming from userspace, preserve the user thread pointer and load
- * the kernel thread pointer. If we came from the kernel, sscratch
- * will contain 0, and we should continue on the current TP.
+ * the kernel thread pointer. If we came from the kernel, the scratch
+ * register will contain 0, and we should continue on the current TP.
*/
- csrrw tp, CSR_SSCRATCH, tp
+ csrrw tp, CSR_SCRATCH, tp
bnez tp, _save_context
_restore_kernel_tpsp:
- csrr tp, CSR_SSCRATCH
+ csrr tp, CSR_SCRATCH
REG_S sp, TASK_TI_KERNEL_SP(tp)
_save_context:
REG_S sp, TASK_TI_USER_SP(tp)
@@ -79,16 +79,16 @@ _save_context:
li t0, SR_SUM | SR_FS
REG_L s0, TASK_TI_USER_SP(tp)
- csrrc s1, CSR_SSTATUS, t0
- csrr s2, CSR_SEPC
- csrr s3, CSR_STVAL
- csrr s4, CSR_SCAUSE
- csrr s5, CSR_SSCRATCH
+ csrrc s1, CSR_STATUS, t0
+ csrr s2, CSR_EPC
+ csrr s3, CSR_TVAL
+ csrr s4, CSR_CAUSE
+ csrr s5, CSR_SCRATCH
REG_S s0, PT_SP(sp)
- REG_S s1, PT_SSTATUS(sp)
- REG_S s2, PT_SEPC(sp)
- REG_S s3, PT_SBADADDR(sp)
- REG_S s4, PT_SCAUSE(sp)
+ REG_S s1, PT_STATUS(sp)
+ REG_S s2, PT_EPC(sp)
+ REG_S s3, PT_BADADDR(sp)
+ REG_S s4, PT_CAUSE(sp)
REG_S s5, PT_TP(sp)
.endm
@@ -97,7 +97,7 @@ _save_context:
* registers from the stack.
*/
.macro RESTORE_ALL
- REG_L a0, PT_SSTATUS(sp)
+ REG_L a0, PT_STATUS(sp)
/*
* The current load reservation is effectively part of the processor's
* state, in the sense that load reservations cannot be shared between
@@ -115,11 +115,11 @@ _save_context:
* completes, implementations are allowed to expand reservations to be
* arbitrarily large.
*/
- REG_L a2, PT_SEPC(sp)
- REG_SC x0, a2, PT_SEPC(sp)
+ REG_L a2, PT_EPC(sp)
+ REG_SC x0, a2, PT_EPC(sp)
- csrw CSR_SSTATUS, a0
- csrw CSR_SEPC, a2
+ csrw CSR_STATUS, a0
+ csrw CSR_EPC, a2
REG_L x1, PT_RA(sp)
REG_L x3, PT_GP(sp)
@@ -163,10 +163,10 @@ ENTRY(handle_exception)
SAVE_ALL
/*
- * Set sscratch register to 0, so that if a recursive exception
+ * Set the scratch register to 0, so that if a recursive exception
* occurs, the exception vector knows it came from the kernel
*/
- csrw CSR_SSCRATCH, x0
+ csrw CSR_SCRATCH, x0
/* Load the global pointer */
.option push
@@ -185,11 +185,13 @@ ENTRY(handle_exception)
move a0, sp /* pt_regs */
tail do_IRQ
1:
- /* Exceptions run with interrupts enabled or disabled
- depending on the state of sstatus.SR_SPIE */
- andi t0, s1, SR_SPIE
+ /*
+ * Exceptions run with interrupts enabled or disabled depending on the
+ * state of SR_PIE in m/sstatus.
+ */
+ andi t0, s1, SR_PIE
beqz t0, 1f
- csrs CSR_SSTATUS, SR_SIE
+ csrs CSR_STATUS, SR_IE
1:
/* Handle syscalls */
@@ -217,7 +219,7 @@ handle_syscall:
* scall instruction on sret
*/
addi s2, s2, 0x4
- REG_S s2, PT_SEPC(sp)
+ REG_S s2, PT_EPC(sp)
/* Trace syscalls, but only if requested by the user. */
REG_L t0, TASK_TI_FLAGS(tp)
andi t0, t0, _TIF_SYSCALL_WORK
@@ -267,9 +269,15 @@ ret_from_syscall_rejected:
bnez t0, handle_syscall_trace_exit
ret_from_exception:
- REG_L s0, PT_SSTATUS(sp)
- csrc CSR_SSTATUS, SR_SIE
+ REG_L s0, PT_STATUS(sp)
+ csrc CSR_STATUS, SR_IE
+#ifdef CONFIG_RISCV_M_MODE
+ /* the MPP value is too large to be used as an immediate arg for addi */
+ li t0, SR_MPP
+ and s0, s0, t0
+#else
andi s0, s0, SR_SPP
+#endif
bnez s0, resume_kernel
resume_userspace:
@@ -283,14 +291,18 @@ resume_userspace:
REG_S s0, TASK_TI_KERNEL_SP(tp)
/*
- * Save TP into sscratch, so we can find the kernel data structures
- * again.
+ * Save TP into the scratch register , so we can find the kernel data
+ * structures again.
*/
- csrw CSR_SSCRATCH, tp
+ csrw CSR_SCRATCH, tp
restore_all:
RESTORE_ALL
+#ifdef CONFIG_RISCV_M_MODE
+ mret
+#else
sret
+#endif
#if IS_ENABLED(CONFIG_PREEMPT)
resume_kernel:
@@ -310,7 +322,7 @@ work_pending:
bnez s1, work_resched
work_notifysig:
/* Handle pending signals and notify-resume requests */
- csrs CSR_SSTATUS, SR_SIE /* Enable interrupts for do_notify_resume() */
+ csrs CSR_STATUS, SR_IE /* Enable interrupts for do_notify_resume() */
move a0, sp /* pt_regs */
move a1, s0 /* current_thread_info->flags */
tail do_notify_resume
@@ -409,6 +421,10 @@ ENTRY(__switch_to)
ret
ENDPROC(__switch_to)
+#ifndef CONFIG_MMU
+#define do_page_fault do_trap_unknown
+#endif
+
.section ".rodata"
/* Exception vector table */
ENTRY(excp_vect_table)
@@ -430,3 +446,10 @@ ENTRY(excp_vect_table)
RISCV_PTR do_page_fault /* store page fault */
excp_vect_table_end:
END(excp_vect_table)
+
+#ifndef CONFIG_MMU
+ENTRY(__user_rt_sigreturn)
+ li a7, __NR_rt_sigreturn
+ scall
+END(__user_rt_sigreturn)
+#endif
diff --git a/arch/riscv/kernel/fpu.S b/arch/riscv/kernel/fpu.S
index 631d31540660..dd2205473de7 100644
--- a/arch/riscv/kernel/fpu.S
+++ b/arch/riscv/kernel/fpu.S
@@ -23,7 +23,7 @@ ENTRY(__fstate_save)
li a2, TASK_THREAD_F0
add a0, a0, a2
li t1, SR_FS
- csrs CSR_SSTATUS, t1
+ csrs CSR_STATUS, 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 CSR_SSTATUS, t1
+ csrc CSR_STATUS, 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 CSR_SSTATUS, t1
+ 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)
@@ -101,6 +101,6 @@ ENTRY(__fstate_restore)
fld f30, TASK_THREAD_F30_F0(a0)
fld f31, TASK_THREAD_F31_F0(a0)
fscsr t0
- csrc CSR_SSTATUS, t1
+ csrc CSR_STATUS, t1
ret
ENDPROC(__fstate_restore)
diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
index 72f89b7590dd..84a6f0a4b120 100644
--- a/arch/riscv/kernel/head.S
+++ b/arch/riscv/kernel/head.S
@@ -11,6 +11,7 @@
#include <asm/thread_info.h>
#include <asm/page.h>
#include <asm/csr.h>
+#include <asm/hwcap.h>
#include <asm/image.h>
__INIT
@@ -47,8 +48,22 @@ ENTRY(_start)
.global _start_kernel
_start_kernel:
/* Mask all interrupts */
- csrw CSR_SIE, zero
- csrw CSR_SIP, zero
+ csrw CSR_IE, zero
+ csrw CSR_IP, zero
+
+#ifdef CONFIG_RISCV_M_MODE
+ /* flush the instruction cache */
+ fence.i
+
+ /* Reset all registers except ra, a0, a1 */
+ call reset_regs
+
+ /*
+ * The hartid in a0 is expected later on, and we have no firmware
+ * to hand it to us.
+ */
+ csrr a0, CSR_MHARTID
+#endif /* CONFIG_RISCV_M_MODE */
/* Load the global pointer */
.option push
@@ -61,7 +76,7 @@ _start_kernel:
* floating point in kernel space
*/
li t0, SR_FS
- csrc CSR_SSTATUS, t0
+ csrc CSR_STATUS, t0
#ifdef CONFIG_SMP
li t0, CONFIG_NR_CPUS
@@ -94,8 +109,10 @@ clear_bss_done:
la sp, init_thread_union + THREAD_SIZE
mv a0, s1
call setup_vm
+#ifdef CONFIG_MMU
la a0, early_pg_dir
call relocate
+#endif /* CONFIG_MMU */
/* Restore C environment */
la tp, init_task
@@ -106,6 +123,7 @@ clear_bss_done:
call parse_dtb
tail start_kernel
+#ifdef CONFIG_MMU
relocate:
/* Relocate return address */
li a1, PAGE_OFFSET
@@ -116,7 +134,7 @@ relocate:
/* Point stvec to virtual address of intruction after satp write */
la a2, 1f
add a2, a2, a1
- csrw CSR_STVEC, a2
+ csrw CSR_TVEC, a2
/* Compute satp for kernel page tables, but don't load it yet */
srl a2, a0, PAGE_SHIFT
@@ -138,7 +156,7 @@ relocate:
1:
/* Set trap vector to spin forever to help debug */
la a0, .Lsecondary_park
- csrw CSR_STVEC, a0
+ csrw CSR_TVEC, a0
/* Reload the global pointer */
.option push
@@ -156,12 +174,13 @@ relocate:
sfence.vma
ret
+#endif /* CONFIG_MMU */
.Lsecondary_start:
#ifdef CONFIG_SMP
/* Set trap vector to spin forever to help debug */
la a3, .Lsecondary_park
- csrw CSR_STVEC, a3
+ csrw CSR_TVEC, a3
slli a3, a0, LGREG
la a1, __cpu_up_stack_pointer
@@ -181,9 +200,11 @@ relocate:
beqz tp, .Lwait_for_cpu_up
fence
+#ifdef CONFIG_MMU
/* Enable virtual memory and relocate to virtual address */
la a0, swapper_pg_dir
call relocate
+#endif
tail smp_callin
#endif
@@ -195,6 +216,85 @@ relocate:
j .Lsecondary_park
END(_start)
+#ifdef CONFIG_RISCV_M_MODE
+ENTRY(reset_regs)
+ li sp, 0
+ li gp, 0
+ li tp, 0
+ li t0, 0
+ li t1, 0
+ li t2, 0
+ li s0, 0
+ li s1, 0
+ li a2, 0
+ li a3, 0
+ li a4, 0
+ li a5, 0
+ li a6, 0
+ li a7, 0
+ li s2, 0
+ li s3, 0
+ li s4, 0
+ li s5, 0
+ li s6, 0
+ li s7, 0
+ li s8, 0
+ li s9, 0
+ li s10, 0
+ li s11, 0
+ li t3, 0
+ li t4, 0
+ li t5, 0
+ li t6, 0
+ csrw sscratch, 0
+
+#ifdef CONFIG_FPU
+ csrr t0, CSR_MISA
+ andi t0, t0, (COMPAT_HWCAP_ISA_F | COMPAT_HWCAP_ISA_D)
+ bnez t0, .Lreset_regs_done
+
+ li t1, SR_FS
+ csrs CSR_STATUS, t1
+ fmv.s.x f0, zero
+ fmv.s.x f1, zero
+ fmv.s.x f2, zero
+ fmv.s.x f3, zero
+ fmv.s.x f4, zero
+ fmv.s.x f5, zero
+ fmv.s.x f6, zero
+ fmv.s.x f7, zero
+ fmv.s.x f8, zero
+ fmv.s.x f9, zero
+ fmv.s.x f10, zero
+ fmv.s.x f11, zero
+ fmv.s.x f12, zero
+ fmv.s.x f13, zero
+ fmv.s.x f14, zero
+ fmv.s.x f15, zero
+ fmv.s.x f16, zero
+ fmv.s.x f17, zero
+ fmv.s.x f18, zero
+ fmv.s.x f19, zero
+ fmv.s.x f20, zero
+ fmv.s.x f21, zero
+ fmv.s.x f22, zero
+ fmv.s.x f23, zero
+ fmv.s.x f24, zero
+ fmv.s.x f25, zero
+ fmv.s.x f26, zero
+ fmv.s.x f27, zero
+ fmv.s.x f28, zero
+ fmv.s.x f29, zero
+ fmv.s.x f30, zero
+ fmv.s.x f31, zero
+ csrw fcsr, 0
+ /* note that the caller must clear SR_FS */
+#endif /* CONFIG_FPU */
+.Lreset_regs_done:
+ ret
+END(reset_regs)
+#endif /* CONFIG_RISCV_M_MODE */
+
__PAGE_ALIGNED_BSS
/* Empty zero page */
.balign PAGE_SIZE
diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
index fffac6ddb0e0..3f07a91d5afb 100644
--- a/arch/riscv/kernel/irq.c
+++ b/arch/riscv/kernel/irq.c
@@ -11,13 +11,6 @@
#include <linux/seq_file.h>
#include <asm/smp.h>
-/*
- * Possible interrupt causes:
- */
-#define INTERRUPT_CAUSE_SOFTWARE IRQ_S_SOFT
-#define INTERRUPT_CAUSE_TIMER IRQ_S_TIMER
-#define INTERRUPT_CAUSE_EXTERNAL IRQ_S_EXT
-
int arch_show_interrupts(struct seq_file *p, int prec)
{
show_ipi_stats(p, prec);
@@ -29,12 +22,12 @@ asmlinkage __visible void __irq_entry do_IRQ(struct pt_regs *regs)
struct pt_regs *old_regs = set_irq_regs(regs);
irq_enter();
- switch (regs->scause & ~SCAUSE_IRQ_FLAG) {
- case INTERRUPT_CAUSE_TIMER:
+ switch (regs->cause & ~CAUSE_IRQ_FLAG) {
+ case IRQ_TIMER:
riscv_timer_interrupt();
break;
#ifdef CONFIG_SMP
- case INTERRUPT_CAUSE_SOFTWARE:
+ case IRQ_SOFT:
/*
* We only use software interrupts to pass IPIs, so if a non-SMP
* system gets one, then we don't know what to do.
@@ -42,11 +35,11 @@ asmlinkage __visible void __irq_entry do_IRQ(struct pt_regs *regs)
riscv_software_interrupt();
break;
#endif
- case INTERRUPT_CAUSE_EXTERNAL:
+ case IRQ_EXT:
handle_arch_irq(regs);
break;
default:
- pr_alert("unexpected interrupt cause 0x%lx", regs->scause);
+ pr_alert("unexpected interrupt cause 0x%lx", regs->cause);
BUG();
}
irq_exit();
diff --git a/arch/riscv/kernel/perf_callchain.c b/arch/riscv/kernel/perf_callchain.c
index 8d2804f05cf9..cf190197a22f 100644
--- a/arch/riscv/kernel/perf_callchain.c
+++ b/arch/riscv/kernel/perf_callchain.c
@@ -67,7 +67,7 @@ void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
return;
fp = regs->s0;
- perf_callchain_store(entry, regs->sepc);
+ perf_callchain_store(entry, regs->epc);
fp = user_backtrace(entry, fp, regs->ra);
while (fp && !(fp & 0x3) && entry->nr < entry->max_stack)
diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index 85e3c39bb60b..95a3031e5c7c 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -35,8 +35,8 @@ void show_regs(struct pt_regs *regs)
{
show_regs_print_info(KERN_DEFAULT);
- pr_cont("sepc: " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n",
- regs->sepc, regs->ra, regs->sp);
+ pr_cont("epc: " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n",
+ regs->epc, regs->ra, regs->sp);
pr_cont(" gp : " REG_FMT " tp : " REG_FMT " t0 : " REG_FMT "\n",
regs->gp, regs->tp, regs->t0);
pr_cont(" t1 : " REG_FMT " t2 : " REG_FMT " s0 : " REG_FMT "\n",
@@ -58,23 +58,23 @@ void show_regs(struct pt_regs *regs)
pr_cont(" t5 : " REG_FMT " t6 : " REG_FMT "\n",
regs->t5, regs->t6);
- pr_cont("sstatus: " REG_FMT " sbadaddr: " REG_FMT " scause: " REG_FMT "\n",
- regs->sstatus, regs->sbadaddr, regs->scause);
+ pr_cont("status: " REG_FMT " badaddr: " REG_FMT " cause: " REG_FMT "\n",
+ regs->status, regs->badaddr, regs->cause);
}
void start_thread(struct pt_regs *regs, unsigned long pc,
unsigned long sp)
{
- regs->sstatus = SR_SPIE;
+ regs->status = SR_PIE;
if (has_fpu) {
- regs->sstatus |= SR_FS_INITIAL;
+ regs->status |= SR_FS_INITIAL;
/*
* Restore the initial value to the FP register
* before starting the user program.
*/
fstate_restore(current, regs);
}
- regs->sepc = pc;
+ regs->epc = pc;
regs->sp = sp;
set_fs(USER_DS);
}
@@ -110,7 +110,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
const register unsigned long gp __asm__ ("gp");
memset(childregs, 0, sizeof(struct pt_regs));
childregs->gp = gp;
- childregs->sstatus = SR_SPP | SR_SPIE; /* Supervisor, irqs on */
+ /* Supervisor/Machine, irqs on: */
+ childregs->status = SR_PP | SR_PIE;
p->thread.ra = (unsigned long)ret_from_kernel_thread;
p->thread.s[0] = usp; /* fn */
diff --git a/arch/riscv/kernel/reset.c b/arch/riscv/kernel/reset.c
index aa56bb135ec4..ee5878d968cc 100644
--- a/arch/riscv/kernel/reset.c
+++ b/arch/riscv/kernel/reset.c
@@ -5,12 +5,11 @@
#include <linux/reboot.h>
#include <linux/pm.h>
-#include <asm/sbi.h>
static void default_power_off(void)
{
- sbi_shutdown();
- while (1);
+ while (1)
+ wait_for_interrupt();
}
void (*pm_power_off)(void) = default_power_off;
diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
new file mode 100644
index 000000000000..f6c7c3e82d28
--- /dev/null
+++ b/arch/riscv/kernel/sbi.c
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <asm/sbi.h>
+
+static void sbi_power_off(void)
+{
+ sbi_shutdown();
+}
+
+static int __init sbi_init(void)
+{
+ pm_power_off = sbi_power_off;
+ return 0;
+}
+early_initcall(sbi_init);
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index 845ae0e12115..365ff8420bfe 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -17,6 +17,7 @@
#include <linux/sched/task.h>
#include <linux/swiotlb.h>
+#include <asm/clint.h>
#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/pgtable.h>
@@ -67,6 +68,7 @@ void __init setup_arch(char **cmdline_p)
setup_bootmem();
paging_init();
unflatten_device_tree();
+ clint_init_boot_cpu();
#ifdef CONFIG_SWIOTLB
swiotlb_init(1);
diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
index d0f6f212f5df..17ba190e84a5 100644
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -17,11 +17,16 @@
#include <asm/switch_to.h>
#include <asm/csr.h>
+extern u32 __user_rt_sigreturn[2];
+
#define DEBUG_SIG 0
struct rt_sigframe {
struct siginfo info;
struct ucontext uc;
+#ifndef CONFIG_MMU
+ u32 sigreturn_code[2];
+#endif
};
#ifdef CONFIG_FPU
@@ -124,7 +129,7 @@ badframe:
pr_info_ratelimited(
"%s[%d]: bad frame in %s: frame=%p pc=%p sp=%p\n",
task->comm, task_pid_nr(task), __func__,
- frame, (void *)regs->sepc, (void *)regs->sp);
+ frame, (void *)regs->epc, (void *)regs->sp);
}
force_sig(SIGSEGV);
return 0;
@@ -166,7 +171,6 @@ static inline void __user *get_sigframe(struct ksignal *ksig,
return (void __user *)sp;
}
-
static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
struct pt_regs *regs)
{
@@ -189,8 +193,19 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
return -EFAULT;
/* Set up to return from userspace. */
+#ifdef CONFIG_MMU
regs->ra = (unsigned long)VDSO_SYMBOL(
current->mm->context.vdso, rt_sigreturn);
+#else
+ /*
+ * For the nommu case we don't have a VDSO. Instead we push two
+ * instructions to call the rt_sigreturn syscall onto the user stack.
+ */
+ if (copy_to_user(&frame->sigreturn_code, __user_rt_sigreturn,
+ sizeof(frame->sigreturn_code)))
+ return -EFAULT;
+ regs->ra = (unsigned long)&frame->sigreturn_code;
+#endif /* CONFIG_MMU */
/*
* Set up registers for signal handler.
@@ -199,7 +214,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
* We always pass siginfo and mcontext, regardless of SA_SIGINFO,
* since some things rely on this (e.g. glibc's debug/segfault.c).
*/
- regs->sepc = (unsigned long)ksig->ka.sa.sa_handler;
+ regs->epc = (unsigned long)ksig->ka.sa.sa_handler;
regs->sp = (unsigned long)frame;
regs->a0 = ksig->sig; /* a0: signal number */
regs->a1 = (unsigned long)(&frame->info); /* a1: siginfo pointer */
@@ -208,7 +223,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
#if DEBUG_SIG
pr_info("SIG deliver (%s:%d): sig=%d pc=%p ra=%p sp=%p\n",
current->comm, task_pid_nr(current), ksig->sig,
- (void *)regs->sepc, (void *)regs->ra, frame);
+ (void *)regs->epc, (void *)regs->ra, frame);
#endif
return 0;
@@ -220,10 +235,9 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
int ret;
/* Are we from a system call? */
- if (regs->scause == EXC_SYSCALL) {
+ if (regs->cause == EXC_SYSCALL) {
/* Avoid additional syscall restarting via ret_from_exception */
- regs->scause = -1UL;
-
+ regs->cause = -1UL;
/* If so, check system call restarting.. */
switch (regs->a0) {
case -ERESTART_RESTARTBLOCK:
@@ -239,7 +253,7 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
/* fallthrough */
case -ERESTARTNOINTR:
regs->a0 = regs->orig_a0;
- regs->sepc -= 0x4;
+ regs->epc -= 0x4;
break;
}
}
@@ -261,9 +275,9 @@ static void do_signal(struct pt_regs *regs)
}
/* Did we come from a system call? */
- if (regs->scause == EXC_SYSCALL) {
+ if (regs->cause == EXC_SYSCALL) {
/* Avoid additional syscall restarting via ret_from_exception */
- regs->scause = -1UL;
+ regs->cause = -1UL;
/* Restart the system call - no handlers present */
switch (regs->a0) {
@@ -271,12 +285,12 @@ static void do_signal(struct pt_regs *regs)
case -ERESTARTSYS:
case -ERESTARTNOINTR:
regs->a0 = regs->orig_a0;
- regs->sepc -= 0x4;
+ regs->epc -= 0x4;
break;
case -ERESTART_RESTARTBLOCK:
regs->a0 = regs->orig_a0;
regs->a7 = __NR_restart_syscall;
- regs->sepc -= 0x4;
+ regs->epc -= 0x4;
break;
}
}
diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
index 5c9ec78422c2..eb878abcaaf8 100644
--- a/arch/riscv/kernel/smp.c
+++ b/arch/riscv/kernel/smp.c
@@ -16,6 +16,7 @@
#include <linux/seq_file.h>
#include <linux/delay.h>
+#include <asm/clint.h>
#include <asm/sbi.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
@@ -92,7 +93,10 @@ static void send_ipi_mask(const struct cpumask *mask, enum ipi_message_type op)
smp_mb__after_atomic();
riscv_cpuid_to_hartid_mask(mask, &hartid_mask);
- sbi_send_ipi(cpumask_bits(&hartid_mask));
+ if (IS_ENABLED(CONFIG_RISCV_SBI))
+ sbi_send_ipi(cpumask_bits(&hartid_mask));
+ else
+ clint_send_ipi_mask(&hartid_mask);
}
static void send_ipi_single(int cpu, enum ipi_message_type op)
@@ -103,12 +107,18 @@ static void send_ipi_single(int cpu, enum ipi_message_type op)
set_bit(op, &ipi_data[cpu].bits);
smp_mb__after_atomic();
- sbi_send_ipi(cpumask_bits(cpumask_of(hartid)));
+ if (IS_ENABLED(CONFIG_RISCV_SBI))
+ sbi_send_ipi(cpumask_bits(cpumask_of(hartid)));
+ else
+ clint_send_ipi_single(hartid);
}
static inline void clear_ipi(void)
{
- csr_clear(CSR_SIP, SIE_SSIE);
+ if (IS_ENABLED(CONFIG_RISCV_SBI))
+ csr_clear(CSR_IP, IE_SIE);
+ else
+ clint_clear_ipi(cpuid_to_hartid_map(smp_processor_id()));
}
void riscv_software_interrupt(void)
diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 261f4087cc39..8bc01f0ca73b 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -24,6 +24,7 @@
#include <linux/of.h>
#include <linux/sched/task_stack.h>
#include <linux/sched/mm.h>
+#include <asm/clint.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
@@ -137,6 +138,9 @@ asmlinkage __visible void __init smp_callin(void)
{
struct mm_struct *mm = &init_mm;
+ if (!IS_ENABLED(CONFIG_RISCV_SBI))
+ clint_clear_ipi(cpuid_to_hartid_map(smp_processor_id()));
+
/* All kernel threads share the same mm context. */
mmgrab(mm);
current->active_mm = mm;
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 473de3ae8bb7..f4cad5163bf2 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -41,7 +41,7 @@ void die(struct pt_regs *regs, const char *str)
print_modules();
show_regs(regs);
- ret = notify_die(DIE_OOPS, str, regs, 0, regs->scause, SIGSEGV);
+ ret = notify_die(DIE_OOPS, str, regs, 0, regs->cause, SIGSEGV);
bust_spinlocks(0);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
@@ -86,7 +86,7 @@ static void do_trap_error(struct pt_regs *regs, int signo, int code,
#define DO_ERROR_INFO(name, signo, code, str) \
asmlinkage __visible void name(struct pt_regs *regs) \
{ \
- do_trap_error(regs, signo, code, regs->sepc, "Oops - " str); \
+ do_trap_error(regs, signo, code, regs->epc, "Oops - " str); \
}
DO_ERROR_INFO(do_trap_unknown,
@@ -124,9 +124,9 @@ static inline unsigned long get_break_insn_length(unsigned long pc)
asmlinkage __visible void do_trap_break(struct pt_regs *regs)
{
if (user_mode(regs))
- force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->sepc);
- else if (report_bug(regs->sepc, regs) == BUG_TRAP_TYPE_WARN)
- regs->sepc += get_break_insn_length(regs->sepc);
+ force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->epc);
+ else if (report_bug(regs->epc, regs) == BUG_TRAP_TYPE_WARN)
+ regs->epc += get_break_insn_length(regs->epc);
else
die(regs, "Kernel BUG");
}
@@ -153,9 +153,9 @@ void __init trap_init(void)
* Set sup0 scratch register to 0, indicating to exception vector
* that we are presently executing in the kernel
*/
- csr_write(CSR_SSCRATCH, 0);
+ csr_write(CSR_SCRATCH, 0);
/* Set the exception vector address */
- csr_write(CSR_STVEC, &handle_exception);
+ csr_write(CSR_TVEC, &handle_exception);
/* Enable all interrupts */
- csr_write(CSR_SIE, -1);
+ csr_write(CSR_IE, -1);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 19:04:10 +0000