diff options
| author | Anup Patel <anup.patel@wdc.com> | 2020-01-03 07:50:12 +0300 |
|---|---|---|
| committer | Anup Patel <anup.patel@wdc.com> | 2020-01-07 09:41:25 +0300 |
| commit | 2aa43a13cdd32f11c2dac30265272c9af8c6e42b (patch) | |
| tree | 921368ae232f75540edfb621afa950effd24fc1a /lib | |
| parent | 1993182f032b71a4d16e39bff12c142dd25dd67e (diff) | |
| download | opensbi-2aa43a13cdd32f11c2dac30265272c9af8c6e42b.tar.xz | |
lib: save/restore MIE CSR in sbi_hart_wait_for_coldboot()
Currently, sbi_hart_wait_for_coldboot() leaves MIE.MSIP bit
set when it returns which is not correct because MIE.MSIP
should be left enabled only by sbi_ipi_init().
This patch does save/restore of MIE CSR to ensure that MIE
CSR is in original state after sbi_hart_wait_for_coldboot()
returns.
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/sbi/sbi_hart.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c index a704c60..dd2f99e 100644 --- a/lib/sbi/sbi_hart.c +++ b/lib/sbi/sbi_hart.c @@ -354,12 +354,16 @@ static unsigned long coldboot_wait_bitmap = 0; void sbi_hart_wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid) { + unsigned long saved_mie; const struct sbi_platform *plat = sbi_platform_ptr(scratch); if ((sbi_platform_hart_count(plat) <= hartid) || (COLDBOOT_WAIT_BITMAP_SIZE <= hartid)) sbi_hart_hang(); + /* Save MIE CSR */ + saved_mie = csr_read(CSR_MIE); + /* Set MSIE bit to receive IPI */ csr_set(CSR_MIE, MIP_MSIP); @@ -382,6 +386,9 @@ void sbi_hart_wait_for_coldboot(struct sbi_scratch *scratch, u32 hartid) /* Release coldboot lock */ spin_unlock(&coldboot_lock); + /* Restore MIE CSR */ + csr_write(CSR_MIE, saved_mie); + /* Clear current HART IPI */ sbi_platform_ipi_clear(plat, hartid); } |