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lib: Support vector extension

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Enable vector context in mstatus by updating the corresponding bits
in mstatus if vector extension is supported by the hart.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra
2020-04-16 18:56:30 -07:00
committed by Anup Patel
parent f281de885e
commit 6c7922e23b
2 changed files with 10 additions and 1 deletions
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2
include/sbi/riscv_encoding.h
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@@ -25,6 +25,7 @@
#define MSTATUS_MPP (_UL(3) << MSTATUS_MPP_SHIFT)
#define MSTATUS_FS _UL(0x00006000)
#define MSTATUS_XS _UL(0x00018000)
#define MSTATUS_VS _UL(0x01800000)
#define MSTATUS_MPRV _UL(0x00020000)
#define MSTATUS_SUM _UL(0x00040000)
#define MSTATUS_MXR _UL(0x00080000)
@@ -53,6 +54,7 @@
#define SSTATUS_SPP MSTATUS_SPP
#define SSTATUS_FS MSTATUS_FS
#define SSTATUS_XS MSTATUS_XS
#define SSTATUS_VS MSTATUS_VS
#define SSTATUS_SUM MSTATUS_SUM
#define SSTATUS_MXR MSTATUS_MXR
#define SSTATUS32_SD MSTATUS32_SD

9
lib/sbi/sbi_hart.c
View File

@@ -25,10 +25,17 @@ void (*sbi_hart_unpriv_trap)(void) = &__sbi_unpriv_trap;
static void mstatus_init(struct sbi_scratch *scratch, u32 hartid)
{
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
unsigned long mstatus_val = 0;
/* Enable FPU */
if (misa_extension('D') || misa_extension('F'))
csr_write(CSR_MSTATUS, MSTATUS_FS);
mstatus_val |= MSTATUS_FS;
/* Enable Vector context */
if (misa_extension('V'))
mstatus_val |= MSTATUS_VS;
csr_write(CSR_MSTATUS, mstatus_val);
/* Enable user/supervisor use of perf counters */
if (misa_extension('S') && sbi_platform_has_scounteren(plat))