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lib: Extend sbi_hart_switch_mode() to support hypervisor extension

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This patch extends sbi_hart_switch_mode() to support entering
VS/VU modes when hypervisor extension is available.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Anup Patel
2019-04-05 14:08:57 +05:30
committed by Anup Patel
parent 0089897d41
commit 1a5614e971
4 changed files with 44 additions and 5 deletions
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27
lib/sbi/sbi_hart.c
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@@ -241,9 +241,14 @@ void __attribute__((noreturn)) sbi_hart_hang(void)
void __attribute__((noreturn))
sbi_hart_switch_mode(unsigned long arg0, unsigned long arg1,
unsigned long next_addr, unsigned long next_mode)
unsigned long next_addr, unsigned long next_mode,
bool next_virt)
{
#if __riscv_xlen == 32
unsigned long val, valH;
#else
unsigned long val;
#endif
switch (next_mode) {
case PRV_M:
@@ -263,7 +268,25 @@ sbi_hart_switch_mode(unsigned long arg0, unsigned long arg1,
val = csr_read(CSR_MSTATUS);
val = INSERT_FIELD(val, MSTATUS_MPP, next_mode);
val = INSERT_FIELD(val, MSTATUS_MPIE, 0);
#if __riscv_xlen == 32
if (misa_extension('H')) {
valH = csr_read(CSR_MSTATUSH);
valH = INSERT_FIELD(valH, MSTATUSH_MTL, 0);
if (next_virt)
valH = INSERT_FIELD(valH, MSTATUSH_MPV, 1);
else
valH = INSERT_FIELD(valH, MSTATUSH_MPV, 0);
csr_write(CSR_MSTATUSH, valH);
}
#else
if (misa_extension('H')) {
val = INSERT_FIELD(val, MSTATUS_MTL, 0);
if (next_virt)
val = INSERT_FIELD(val, MSTATUS_MPV, 1);
else
val = INSERT_FIELD(val, MSTATUS_MPV, 0);
}
#endif
csr_write(CSR_MSTATUS, val);
csr_write(CSR_MEPC, next_addr);