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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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14
include/sbi/riscv_encoding.h
View File

@@ -38,8 +38,21 @@
#define MSTATUS_TW 0x00200000
#define MSTATUS_TSR 0x00400000
#define MSTATUS32_SD 0x80000000
#if __riscv_xlen == 64
#define MSTATUS_UXL 0x0000000300000000
#define MSTATUS_SXL 0x0000000C00000000
#define MSTATUS_MTL 0x0000004000000000
#define MSTATUS_MTL_SHIFT 38
#define MSTATUS_MPV 0x0000008000000000
#define MSTATUS_MPV_HIFT 39
#else
#define MSTATUSH_UXL 0x00000003
#define MSTATUSH_SXL 0x0000000C
#define MSTATUSH_MTL 0x00000040
#define MSTATUSH_MTL_SHIFT 6
#define MSTATUSH_MPV 0x00000080
#define MSTATUSH_MPV_HIFT 7
#endif
#define MSTATUS64_SD 0x8000000000000000
#define SSTATUS_UIE 0x00000001
@@ -256,6 +269,7 @@
#define CSR_MIE 0x304
#define CSR_MTVEC 0x305
#define CSR_MCOUNTEREN 0x306
#define CSR_MSTATUSH 0x310
#define CSR_MSCRATCH 0x340
#define CSR_MEPC 0x341
#define CSR_MCAUSE 0x342

3
include/sbi/sbi_hart.h
View File

@@ -26,7 +26,8 @@ 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);
void sbi_hart_mark_available(u32 hartid);

27
lib/sbi/sbi_hart.c
View File

@@ -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);

5
lib/sbi/sbi_init.c
View File

@@ -102,7 +102,7 @@ static void __noreturn init_coldboot(struct sbi_scratch *scratch, u32 hartid)
sbi_hart_wake_coldboot_harts(scratch, hartid);
sbi_hart_mark_available(hartid);
sbi_hart_switch_mode(hartid, scratch->next_arg1, scratch->next_addr,
scratch->next_mode);
scratch->next_mode, FALSE);
}
static void __noreturn init_warmboot(struct sbi_scratch *scratch, u32 hartid)
@@ -147,7 +147,8 @@ static void __noreturn init_warmboot(struct sbi_scratch *scratch, u32 hartid)
sbi_hart_hang();
else
sbi_hart_switch_mode(hartid, scratch->next_arg1,
scratch->next_addr, scratch->next_mode);
scratch->next_addr,
scratch->next_mode, FALSE);
}
static atomic_t coldboot_lottery = ATOMIC_INITIALIZER(0);