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author | Guo Ren <ren_guo@c-sky.com> | 2018-09-05 14:25:08 +0800 |
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committer | Guo Ren <ren_guo@c-sky.com> | 2018-10-25 23:36:19 +0800 |
commit | 081860b970adb69888734df0c8aa849b00ea7254 (patch) | |
tree | b913c3a0f6d690677ebcd10f40f02c635f4a92a9 /arch/csky/kernel/cpu-probe.c | |
parent | 9143a9359d051142081b26c3726c928f965c5eb7 (diff) | |
download | linux-081860b970adb69888734df0c8aa849b00ea7254.tar.gz linux-081860b970adb69888734df0c8aa849b00ea7254.tar.bz2 linux-081860b970adb69888734df0c8aa849b00ea7254.zip |
csky: Exception handling and mm-fault
This patch adds exception handling code, cpuinfo and mm-fault code.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/csky/kernel/cpu-probe.c')
-rw-r--r-- | arch/csky/kernel/cpu-probe.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/arch/csky/kernel/cpu-probe.c b/arch/csky/kernel/cpu-probe.c new file mode 100644 index 000000000000..5f15ca31d3e8 --- /dev/null +++ b/arch/csky/kernel/cpu-probe.c @@ -0,0 +1,79 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include <linux/of.h> +#include <linux/init.h> +#include <linux/seq_file.h> +#include <linux/memblock.h> + +#include <abi/reg_ops.h> + +static void percpu_print(void *arg) +{ + struct seq_file *m = (struct seq_file *)arg; + unsigned int cur, next, i; + + seq_printf(m, "processor : %d\n", smp_processor_id()); + seq_printf(m, "C-SKY CPU model : %s\n", CSKYCPU_DEF_NAME); + + /* read processor id, max is 100 */ + cur = mfcr("cr13"); + for (i = 0; i < 100; i++) { + seq_printf(m, "product info[%d] : 0x%08x\n", i, cur); + + next = mfcr("cr13"); + + /* some CPU only has one id reg */ + if (cur == next) + break; + + cur = next; + + /* cpid index is 31-28, reset */ + if (!(next >> 28)) { + while ((mfcr("cr13") >> 28) != i); + break; + } + } + + /* CPU feature regs, setup by bootloader or gdbinit */ + seq_printf(m, "hint (CPU funcs): 0x%08x\n", mfcr_hint()); + seq_printf(m, "ccr (L1C & MMU): 0x%08x\n", mfcr("cr18")); + seq_printf(m, "ccr2 (L2C) : 0x%08x\n", mfcr_ccr2()); + seq_printf(m, "\n"); +} + +static int c_show(struct seq_file *m, void *v) +{ + int cpu; + + for_each_online_cpu(cpu) + smp_call_function_single(cpu, percpu_print, m, true); + +#ifdef CSKY_ARCH_VERSION + seq_printf(m, "arch-version : %s\n", CSKY_ARCH_VERSION); + seq_printf(m, "\n"); +#endif + + return 0; +} + +static void *c_start(struct seq_file *m, loff_t *pos) +{ + return *pos < 1 ? (void *)1 : NULL; +} + +static void *c_next(struct seq_file *m, void *v, loff_t *pos) +{ + ++*pos; + return NULL; +} + +static void c_stop(struct seq_file *m, void *v) {} + +const struct seq_operations cpuinfo_op = { + .start = c_start, + .next = c_next, + .stop = c_stop, + .show = c_show, +}; |