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Introduce HAS_MFAULTS_DELEGATION feature

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Conditionnally delegate page fault exceptions from M mode to S mode
based on the platform features.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
This commit is contained in:
Damien Le Moal 2018-12-21 19:19:54 +09:00 • committed by Anup Patel
parent db6c1fe78b
commit 27332e63fa
3 changed files with 13 additions and 7 deletions
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6
include/sbi/sbi_platform.h
View file

@ -18,13 +18,15 @@ enum sbi_platform_features {
SBI_PLATFORM_HAS_PMP = (1 << 2),
SBI_PLATFORM_HAS_SCOUNTEREN = (1 << 3),
SBI_PLATFORM_HAS_MCOUNTEREN = (1 << 4),
SBI_PLATFORM_HAS_MFAULTS_DELEGATION = (1 << 5),
};
#define SBI_PLATFORM_DEFAULT_FEATURES \
(SBI_PLATFORM_HAS_MMIO_TIMER_VALUE | \
SBI_PLATFORM_HAS_PMP | \
SBI_PLATFORM_HAS_SCOUNTEREN | \
SBI_PLATFORM_HAS_MCOUNTEREN)
SBI_PLATFORM_HAS_MCOUNTEREN | \
SBI_PLATFORM_HAS_MFAULTS_DELEGATION)
struct sbi_platform {
char name[64];
@ -71,6 +73,8 @@ struct sbi_platform {
((__p)->features & SBI_PLATFORM_HAS_SCOUNTEREN)
#define sbi_platform_has_mcounteren(__p) \
((__p)->features & SBI_PLATFORM_HAS_MCOUNTEREN)
#define sbi_platform_has_mfaults_delegation(__p) \
((__p)->features & SBI_PLATFORM_HAS_MFAULTS_DELEGATION)
static inline const char *sbi_platform_name(struct sbi_platform *plat)
{

12
lib/sbi_hart.c
View file

@ -83,8 +83,9 @@ static int fp_init(u32 hartid)
return 0;
}
static int delegate_traps(u32 hartid)
static int delegate_traps(struct sbi_scratch *scratch, u32 hartid)
{
struct sbi_platform *plat = sbi_platform_ptr(scratch);
unsigned long interrupts, exceptions;
if (!misa_extension('S')) {
@ -95,11 +96,12 @@ static int delegate_traps(u32 hartid)
/* Send M-mode interrupts and most exceptions to S-mode */
interrupts = MIP_SSIP | MIP_STIP | MIP_SEIP;
exceptions = (1U << CAUSE_MISALIGNED_FETCH) |
(1U << CAUSE_FETCH_PAGE_FAULT) |
(1U << CAUSE_BREAKPOINT) |
(1U << CAUSE_LOAD_PAGE_FAULT) |
(1U << CAUSE_STORE_PAGE_FAULT) |
(1U << CAUSE_USER_ECALL);
if (sbi_platform_has_mfaults_delegation(plat))
exceptions |= (1U << CAUSE_FETCH_PAGE_FAULT) |
(1U << CAUSE_LOAD_PAGE_FAULT) |
(1U << CAUSE_STORE_PAGE_FAULT);
}
csr_write(mideleg, interrupts);
@ -200,7 +202,7 @@ int sbi_hart_init(struct sbi_scratch *scratch, u32 hartid)
if (rc)
return rc;
rc = delegate_traps(hartid);
rc = delegate_traps(scratch, hartid);
if (rc)
return rc;

2
platform/sifive/hifive_u540/platform.c
View file

@ -105,7 +105,7 @@ static int sifive_u_system_down(u32 type)
struct sbi_platform platform = {
.name = STRINGIFY(PLAT_NAME),
.features = SBI_PLATFORM_DEFAULT_FEATURES;
.features = SBI_PLATFORM_DEFAULT_FEATURES,
.hart_count = PLAT_HART_COUNT,
.hart_stack_size = PLAT_HART_STACK_SIZE,
.pmp_region_count = sifive_u_pmp_region_count,