66 lines
1.9 KiB
Diff
66 lines
1.9 KiB
Diff
diff --git a/cmd/riscv/exception.c b/cmd/riscv/exception.c
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index f38f454a0b..9de4effe47 100644
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--- a/cmd/riscv/exception.c
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+++ b/cmd/riscv/exception.c
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@@ -56,6 +56,40 @@ static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc,
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return CMD_RET_FAILURE;
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}
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+static int do_sregs(struct cmd_tbl *cmdtp, int flag, int argc,
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+ char *const argv[])
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+{
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+ ulong stvec, sie, sip, sstatus;
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+
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+ asm volatile ("fence");
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+ asm volatile ("csrr %0, stvec" : "=r"(stvec) : );
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+ asm volatile ("csrr %0, sie" : "=r"(sie) : );
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+ asm volatile ("csrr %0, sip" : "=r"(sip) : );
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+ asm volatile ("csrr %0, sstatus" : "=r"(sstatus) : );
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+
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+ printf("stvec : 0x%016lx\n", stvec);
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+ printf("sie : 0x%016lx\n", sie);
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+ printf("sip : 0x%016lx\n", sip);
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+ printf("sstatus : 0x%016lx\n", sstatus);
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+
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+ return CMD_RET_SUCCESS;
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+}
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+
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+static int do_enable(struct cmd_tbl *cmdtp, int flag, int argc,
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+ char *const argv[])
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+{
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+ ulong which = SIE_SSIE | SIE_SEIE | SIE_STIE;
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+
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+ asm volatile (
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+ "csrsi sstatus, 2\n" /* Enable SIE */
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+ "csrs sie, %0\n" /* Enable selected interrupts */
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+ : /* no output */
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+ : "r" (which)
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+ );
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+
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+ return CMD_RET_SUCCESS;
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+}
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+
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static struct cmd_tbl cmd_sub[] = {
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U_BOOT_CMD_MKENT(compressed, CONFIG_SYS_MAXARGS, 1, do_compressed,
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"", ""),
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@@ -67,6 +101,10 @@ static struct cmd_tbl cmd_sub[] = {
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"", ""),
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U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
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"", ""),
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+ U_BOOT_CMD_MKENT(sregs, CONFIG_SYS_MAXARGS, 1, do_sregs,
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+ "", ""),
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+ U_BOOT_CMD_MKENT(enable, CONFIG_SYS_MAXARGS, 1, do_enable,
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+ "", ""),
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};
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static char exception_help_text[] =
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@@ -77,6 +115,8 @@ static char exception_help_text[] =
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" ialign16 - 16 bit aligned instruction\n"
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" undefined - illegal instruction\n"
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" unaligned - load address misaligned\n"
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+ " sregs - print supervisor registers\n"
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+ " enable - enable supervisor interrupts\n"
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;
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#include <exception.h>
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