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lib: sbi: Implement SBI SSE extension

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The SBI SSE extension defines a set of function that can be called to
register and handle supervisor sofwtare events. This patch implements
all of the functionality defined in the specification.

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 16:57:17 +01:00 • committed by Anup Patel
parent c8cdf01d8f
commit 09ad21445f
3 changed files with 64 additions and 0 deletions
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4
lib/sbi/Kconfig
View file

@ -54,4 +54,8 @@ config SBIUNIT
bool "Enable SBIUNIT tests"
default n
config SBI_ECALL_SSE
bool "SSE extension"
default y
endmenu

3
lib/sbi/objects.mk
View file

@ -55,6 +55,9 @@ libsbi-objs-$(CONFIG_SBI_ECALL_VENDOR) += sbi_ecall_vendor.o
carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_DBTR) += ecall_dbtr
libsbi-objs-$(CONFIG_SBI_ECALL_DBTR) += sbi_ecall_dbtr.o
carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_SSE) += ecall_sse
libsbi-objs-$(CONFIG_SBI_ECALL_SSE) += sbi_ecall_sse.o
libsbi-objs-y += sbi_bitmap.o
libsbi-objs-y += sbi_bitops.o
libsbi-objs-y += sbi_console.o

57
lib/sbi/sbi_ecall_sse.c Normal file
View file

@ -0,0 +1,57 @@
#include <sbi/sbi_error.h>
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_trap.h>
#include <sbi/sbi_sse.h>
static int sbi_ecall_sse_handler(unsigned long extid, unsigned long funcid,
struct sbi_trap_regs *regs,
struct sbi_ecall_return *out)
{
int ret;
switch (funcid) {
case SBI_EXT_SSE_READ_ATTR:
ret = sbi_sse_read_attrs(regs->a0, regs->a1, regs->a2,
regs->a3, regs->a4);
break;
case SBI_EXT_SSE_WRITE_ATTR:
ret = sbi_sse_write_attrs(regs->a0, regs->a1, regs->a2,
regs->a3, regs->a4);
break;
case SBI_EXT_SSE_REGISTER:
ret = sbi_sse_register(regs->a0, regs->a1, regs->a2);
break;
case SBI_EXT_SSE_UNREGISTER:
ret = sbi_sse_unregister(regs->a0);
break;
case SBI_EXT_SSE_ENABLE:
ret = sbi_sse_enable(regs->a0);
break;
case SBI_EXT_SSE_DISABLE:
ret = sbi_sse_disable(regs->a0);
break;
case SBI_EXT_SSE_COMPLETE:
ret = sbi_sse_complete(regs, out);
break;
case SBI_EXT_SSE_INJECT:
ret = sbi_sse_inject_from_ecall(regs->a0, regs->a1, out);
break;
default:
ret = SBI_ENOTSUPP;
}
return ret;
}
struct sbi_ecall_extension ecall_sse;
static int sbi_ecall_sse_register_extensions(void)
{
return sbi_ecall_register_extension(&ecall_sse);
}
struct sbi_ecall_extension ecall_sse = {
.extid_start = SBI_EXT_SSE,
.extid_end = SBI_EXT_SSE,
.register_extensions = sbi_ecall_sse_register_extensions,
.handle = sbi_ecall_sse_handler,
};