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lib: sbi: Add support for Supervisor Software Events extension

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This extension [1] allows to deliver events from SBI to supervisor via
a software mechanism. This extension defines events (either local or
global) which are signaled by the SBI on specific signal sources (IRQ,
exceptions, etc) and are injected to be executed in supervisor mode.

[1] https://lists.riscv.org/g/tech-prs/message/798

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Clément Léger
2024-03-21 16:57:16 +01:00
committed by Anup Patel
parent 76d7e9b8ee
commit c8cdf01d8f
7 changed files with 1322 additions and 1 deletions
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13
lib/sbi/sbi_init.c
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@@ -24,6 +24,7 @@
#include <sbi/sbi_platform.h>
#include <sbi/sbi_pmu.h>
#include <sbi/sbi_dbtr.h>
#include <sbi/sbi_sse.h>
#include <sbi/sbi_system.h>
#include <sbi/sbi_string.h>
#include <sbi/sbi_timer.h>
@@ -319,6 +320,12 @@ static void __noreturn init_coldboot(struct sbi_scratch *scratch, u32 hartid)
if (rc)
sbi_hart_hang();
rc = sbi_sse_init(scratch, true);
if (rc) {
sbi_printf("%s: sse init failed (error %d)\n", __func__, rc);
sbi_hart_hang();
}
rc = sbi_pmu_init(scratch, true);
if (rc) {
sbi_printf("%s: pmu init failed (error %d)\n",
@@ -445,6 +452,10 @@ static void __noreturn init_warm_startup(struct sbi_scratch *scratch,
if (rc)
sbi_hart_hang();
rc = sbi_sse_init(scratch, false);
if (rc)
sbi_hart_hang();
rc = sbi_pmu_init(scratch, false);
if (rc)
sbi_hart_hang();
@@ -653,6 +664,8 @@ void __noreturn sbi_exit(struct sbi_scratch *scratch)
sbi_platform_early_exit(plat);
sbi_sse_exit(scratch);
sbi_pmu_exit(scratch);
sbi_timer_exit(scratch);