lib: sbi: Implement SBI SSE extension

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>

diff --git a/lib/sbi/Kconfig b/lib/sbi/Kconfig
index e3038ee3d28c6f7d1c9852d7db2c18b2c63c6502..cc8e0318cb07400b1633a8b035f74acc06786483 100644 (file)
--- a/lib/sbi/Kconfig
+++ b/lib/sbi/Kconfig
@@ -54,4 +54,8 @@ config SBIUNIT
        bool "Enable SBIUNIT tests"
        default n
 
+config SBI_ECALL_SSE
+       bool "SSE extension"
+       default y
+
 endmenu

diff --git a/lib/sbi/objects.mk b/lib/sbi/objects.mk
index 2b9ac1fa7d926a24082088703da64832a398cd8b..b1c4a5033eefd48158cc4bc6f6987b68c2846ef7 100644 (file)
--- a/lib/sbi/objects.mk
+++ b/lib/sbi/objects.mk
@@ -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

diff --git a/lib/sbi/sbi_ecall_sse.c b/lib/sbi/sbi_ecall_sse.c
new file mode 100644 (file)
index 0000000..a28a033
--- /dev/null
+++ b/lib/sbi/sbi_ecall_sse.c
@@ -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,
+};