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SubjectRe: Re: [PATCH] riscv: Setup exception vector for K210 properly
The serial port did not print anything after early console. 

[ 0.000000] Sorting __ex_table...
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] Memory: 6480K/8192K available (1024K kernel code, 111K rwdata, 170K rodata, 101K init, 97K bss, 1712K reserved, 0K cma-reserved)
[ 0.000000] rcu: Hierarchical RCU implementation.
[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
[ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[ 0.000000] riscv-intc: 64 local interrupts mapped
[ 0.000000] plic: interrupt-controller@c000000: mapped 65 interrupts with 2 handlers for 4 contexts.
[ 0.000000] random: get_random_bytes called from 0x00000000800019a4 with crng_init=0
[ 0.000000] riscv_timer_init_dt: Registering clocksource cpuid [0] hartid [0]
[ 0.000000] clocksource: riscv_clocksource: mask: 0xffffffffffffffff max_cycles: 0x3990be68b, max_idle_ns: 881590404272 ns
[ 0.000015] sched_clock: 64 bits at 7MHz, resolution 128ns, wraps every 4398046511054ns
[ 0.008254] Console: colour dummy device 80x25



> -----原始邮件-----
&gt; 发件人: "Damien Le Moal" <damien.lemoal@wdc.com>
&gt; 发送时间: 2020-08-11 14:42:15 (星期二)
&gt; 收件人: "Qiu Wenbo" <qiuwenbo@phytium.com.cn>, "Palmer Dabbelt" <palmer@dabbelt.com>, "Paul Walmsley" <paul.walmsley@sifive.com>, "linux-riscv@lists.infradead.org" <linux-riscv@lists.infradead.org>
&gt; 抄送: "Albert Ou" <aou@eecs.berkeley.edu>, "Atish Patra" <atish.patra@wdc.com>, "Anup
&gt; Patel" <anup@brainfault.org>, "Guo Ren" <guoren@linux.alibaba.com>, "Zong Li" <zong.li@sifive.com>, "Greentime Hu" <greentime.hu@sifive.com>, "Vincent Chen" <vincent.chen@sifive.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
&gt; 主题: Re: [PATCH] riscv: Setup exception vector for K210 properly
&gt;
&gt; On 2020/08/11 15:38, Qiu Wenbo wrote:
&gt; &gt; Exception vector is missing on nommu platform and it is a big issue.
&gt; &gt; This patch is tested in Sipeed MAIX Bit Dev Board.
&gt; &gt;
&gt; &gt; Fixes: 79b1feba5455 ("RISC-V: Setup exception vector early")
&gt; &gt; Signed-off-by: Qiu Wenbo <qiuwenbo@phytium.com.cn>
&gt; &gt; ---
&gt; &gt; arch/riscv/kernel/smpboot.c | 1 +
&gt; &gt; arch/riscv/kernel/traps.c | 11 ++++++++++-
&gt; &gt; 2 files changed, 11 insertions(+), 1 deletion(-)
&gt; &gt;
&gt; &gt; diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
&gt; &gt; index 356825a57551..23cde0ceb39d 100644
&gt; &gt; --- a/arch/riscv/kernel/smpboot.c
&gt; &gt; +++ b/arch/riscv/kernel/smpboot.c
&gt; &gt; @@ -154,6 +154,7 @@ asmlinkage __visible void smp_callin(void)
&gt; &gt; mmgrab(mm);
&gt; &gt; current-&gt;active_mm = mm;
&gt; &gt;
&gt; &gt; + trap_init();
&gt; &gt; notify_cpu_starting(curr_cpuid);
&gt; &gt; update_siblings_masks(curr_cpuid);
&gt; &gt; set_cpu_online(curr_cpuid, 1);
&gt; &gt; diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
&gt; &gt; index ad14f4466d92..a390239818ae 100644
&gt; &gt; --- a/arch/riscv/kernel/traps.c
&gt; &gt; +++ b/arch/riscv/kernel/traps.c
&gt; &gt; @@ -174,7 +174,16 @@ int is_valid_bugaddr(unsigned long pc)
&gt; &gt; }
&gt; &gt; #endif /* CONFIG_GENERIC_BUG */
&gt; &gt;
&gt; &gt; -/* stvec &amp; scratch is already set from head.S */
&gt; &gt; +/* stvec &amp; scratch is already set from head.S when mmu is enabled */
&gt; &gt; void trap_init(void)
&gt; &gt; {
&gt; &gt; +#ifndef CONFIG_MMU
&gt; &gt; + /*
&gt; &gt; + * Set sup0 scratch register to 0, indicating to exception vector
&gt; &gt; + * that we are presently executing in the kernel
&gt; &gt; + */
&gt; &gt; + csr_write(CSR_SCRATCH, 0);
&gt; &gt; + /* Set the exception vector address */
&gt; &gt; + csr_write(CSR_TVEC, &amp;handle_exception);
&gt; &gt; +#endif
&gt; &gt; }
&gt; &gt;
&gt;
&gt; Looks OK to me. But out of curiosity, how did you trigger a problem ? I never
&gt; got any weird exceptions with my busybox userspace.
&gt;
&gt; --
&gt; Damien Le Moal
&gt; Western Digital Research
</qiuwenbo@phytium.com.cn></linux-kernel@vger.kernel.org></vincent.chen@sifive.com></greentime.hu@sifive.com></zong.li@sifive.com></guoren@linux.alibaba.com></anup@brainfault.org></atish.patra@wdc.com></aou@eecs.berkeley.edu></linux-riscv@lists.infradead.org></paul.walmsley@sifive.com></palmer@dabbelt.com></qiuwenbo@phytium.com.cn></damien.lemoal@wdc.com>




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